Updated on 2024/09/27

写真a

 
TSUBOI Kazuya
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Assistant Professor
Position
Assistant Professor
External link

Degree

  • B.Engr. ( Osaka Prefecture University )

  • M.Engr. ( Tohoku University )

  • Ph.D. (Engr.) ( Tohoku University )

Research Interests

  • Combustion Engineering

  • Computational Fluid Dynamics

  • Combustion Science

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

Education

  • Tohoku University   大学院工学研究科   航空宇宙工学専攻

    2001.4 - 2005.3

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    Notes: 博士課程後期3年の課程

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  • Tohoku University   大学院工学研究科   航空宇宙工学専攻

    1999.4 - 2001.3

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    Country: Japan

    Notes: 博士課程前期2年の課程

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  • Osaka Prefecture University   工学部   機械工学科

    1992.4 - 1997.3

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    Country: Japan

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Research History

  • Okayama University   Faculty of Environmental, Life, Natural Science and Technology   Assistant Professor

    2023.4

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  • Okayama University   The Graduate School of Natural Science and Technology   Assistant Professor

    2021.4 - 2023.3

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  • Okayama University   The Graduate School of Natural Science and Technology   Assistant Professor

    2008.4 - 2021.3

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  • Centre national de la recherche scientifique, France   Laboratoire de Combustion et de Detonique   Invited researcher

    2007.5 - 2007.8

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  • Centre national de la recherche scientifique, France   Laboratoire de Combustion et de Detonique   Invited researcher

    2006.10 - 2006.11

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  • Nagoya University   Ecotopia Science Institute

    2005.4 - 2008.3

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Professional Memberships

  • The Heat Transfer Society of Japan

    2022.5

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  • The Japan Society of Mechanical Engineers

    2006.2

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  • Combustion Society of Japan

    2002.1

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  • The Combustion Institute

    2002.1

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  • The Japan Society for Aeronautical and Space Sciences

    2001.12

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Committee Memberships

  • 日本燃焼学会   令和5年度先進的燃焼技術の調査研究委員会 気体燃焼 小委員会 委員  

    2023.9 - 2024.3   

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    Committee type:Academic society

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  • 日本伝熱学会   中国四国支部 役員  

    2023.6   

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    Committee type:Academic society

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  • 日本機械学会   2024年度年次大会 実行委員  

    2023   

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    Committee type:Academic society

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  • 日本燃焼学会   令和4年度先進的燃焼技術の調査研究委員会 燃焼シミュレーション 小委員会 委員  

    2022.9 - 2023.3   

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    Committee type:Academic society

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  • 中四国熱科学・工学研究会   理事  

    2022.6   

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  • 日本機械学会   中国四国支部 第60期総会・講演会 若手優秀講演フェロー賞 審査員  

    2022.3   

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    Committee type:Academic society

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  • 19th International Conference on Numerical Combustion 2024   Executive Committee  

    2022   

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    Committee type:Academic society

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  • 7th International Workshop on Heat-Mass Transfer Advances for Energy Conservation and Pollution Control   International Organizing Committee (Local Committee)  

    2022 - 2023   

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    Committee type:Academic society

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  • 日本燃焼学会   第58回燃焼シンポジウム 実行委員会 委員  

    2020.4 - 2021.3   

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  • 日本機械学会   中国四国学生会 第50回学生員卒業研究発表講演会 優秀発表賞 審査員  

    2020.3   

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  • 日本機械学会   2019年度(第97期)計算力学技術者資格認定事業委員会 熱流体力学分野小委員会 1級燃焼流WG 委員  

    2019.4 - 2020.3   

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  • 日本機械学会   中国四国学生会 第49回学生員卒業研究発表講演会 優秀発表賞 審査員  

    2019.3   

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  • 自動車技術会   第30回内燃機関シンポジウム実行委員会 委員  

    2018.11 - 2019.12   

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    Committee type:Academic society

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  • 日本燃焼学会   平成30年度先進的燃焼技術の調査研究委員会 気体燃焼 小委員会 委員  

    2018.11 - 2019.3   

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  • 日本機械学会   団体扱い連絡員・中国四国学生会 会員校(岡山大学) 顧問  

    2018.4 - 2022.3   

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  • 日本機械学会   計算力学技術者資格認定事業委員会 1級燃焼流WG 委員  

    2018.4 - 2019.3   

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  • 日本燃焼学会   平成29年度先進的燃焼技術の調査研究委員会 数値シミュレーション 小委員会 委員  

    2017.11 - 2018.3   

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  • 日本機械学会   計算力学技術者資格認定事業委員会 1級燃焼流WG 委員  

    2017.4 - 2018.3   

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  • 日本機械学会   中国四国学生会 第47回学生員卒業研究発表講演会 優秀発表賞 審査員  

    2017.3   

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  • International Student Symposium on Power and Mechanical Engineering at Okayama 2016   運営  

    2016.8   

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    Committee type:Other

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  • 日本機械学会   計算力学技術者資格認定事業委員会 熱流体力学分野小委員会 1級燃焼流WG 委員  

    2016.4 - 2017.3   

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  • The Ninth International Conference on Modeling and Diagnostics for Advanced Engine Systems - COMODIA - 2017   Organizing Committee  

    2015.8 - 2018.3   

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  • 日本機械学会   計算力学技術者資格認定事業委員会 熱流体力学分野小委員会 1級燃焼流WG 委員  

    2015.4 - 2016.3   

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  • 日本燃焼学会   平成26年度先進的燃焼技術の調査研究委員会 乱流燃焼 小委員会 委員  

    2014.11 - 2015.3   

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  • 日本燃焼学会   第52回燃焼シンポジウム 実行委員会 幹事  

    2014.4 - 2015.3   

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  • 日本機械学会   計算力学技術者資格認定事業委員会 熱流体力学分野小委員会 1級燃焼流WG 委員  

    2014.4 - 2015.3   

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  • 日本機械学会   日本機械学会誌 2013年度(第91期)トピックス委員  

    2013.4 - 2014.3   

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  • 日本機械学会   計算力学技術者資格認定事業委員会 熱流体力学分野小委員会 1級燃焼流WG 委員  

    2013.4 - 2014.3   

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  • 日本機械学会   2013年度年次大会 動力エネルギーシステム部門 実行委員  

    2012.4 - 2014.3   

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  • 日本機械学会   動力エネルギーシステム部門 学会企画委員会 委員  

    2012.4 - 2014.3   

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  • 日本機械学会   2013年度年次大会 実行委員(総取りまとめ)  

    2012.4 - 2014.3   

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  • 日本機械学会   計算力学技術者資格認定専門委員会 熱流体力学分野小委員会 1級燃焼流 委員  

    2012.4 - 2013.3   

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  • 日本機械学会   中国四国学生会 第42回学生員卒業研究発表講演会 優秀発表賞 審査員  

    2012.3   

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  • 日本機械学会   中国四国学生会 第41回学生員卒業研究発表講演会 優秀発表賞 審査員  

    2011.3   

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  • 日本機械学会   計算力学部門 計算力学講演会担当委員会(2011) 委員  

    2010.4 - 2012.3   

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  • 日本機械学会   イノベーションセンター 計算力学技術者資格認定専門委員会 熱流体力学分野小委員会 燃焼流WG 委員  

    2010.4 - 2011.3   

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  • 日本機械学会   中国四国学生会 第40回学生員卒業研究発表講演会 優秀発表賞 審査員  

    2010.3   

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  • 日本機械学会   エンジンシステム部門 (第21回)内燃機関シンポジウム実行委員会 委員  

    2009.4 - 2011.3   

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  • 日本機械学会   イノベーションセンター 技術者資格事業委員会 計算力学技術者資格認定専門委員会 熱流体力学分野 試験問題作成WG 委員  

    2009.4 - 2010.3   

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  • 日本機械学会   中国四国学生会 第39回学生員卒業研究発表講演会 優秀発表賞 審査員  

    2009.3   

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  • 日本機械学会   能力開発促進機構 計算力学技術者認定事業委員会(熱流体力学分野 試験問題作成) 委員  

    2008.4 - 2009.3   

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  • 日本機械学会   能力開発促進機構 計算力学技術者認定事業委員会 委員  

    2007.10 - 2008.3   

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  • 宇宙航空研究開発機構   宇宙環境利用科学委員会 研究班 ワーキンググループ 委員  

    2006.2 - 2007.3   

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    Committee type:Other

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Papers

  • A Study of Flame Shape Effect on the Interaction between Flow and Heat Adjacent to the Turbulent Premixed Flame using DNS Invited Reviewed

    K. Tsuboi, T. Matsuka

    7th International Workshop on Heat-Mass Transfer Advances for Energy Conservation and Pollution Control   II-9   2023.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Performance, emissions and end-gas autoignition characteristics of PREMIER combustion in a pilot fuel-ignited dual-fuel biogas engine with various CO2 ratios Reviewed

    Alireza Valipour Berenjestanaki, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    FUEL   286   2021.2

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    Biogas, a renewable and alternative energy, has recently gained attention as an environmentally friendly fuel for power generation in internal combustion (IC) engines. This study aimed to investigate the effect of the carbon dioxide (CO2) to methane (CH4) ratio in a dual-fuel gas engine. It is known that gaseous fuel combustion at high loads is accompanied by knocking if an appropriate combustion controlling strategy is not applied. Therefore, premixed mixture ignition in the end-gas region (PREMIER) combustion was proposed under high load conditions. Experiments were carried out using a dual-fuel gas engine under supercharged conditions, with an intake pressure of 200 kPa. Simulated biogas consisting of CH4 and CO2 was used as a primary fuel and diesel was used as a pilot fuel. The pilot fuel injection timing was varied during the experiments. The indicated mean effective pressure (IMEP) and thermal efficiency increased as injection timing was advanced. With the addition of CO2, the thermal efficiency of PREMIER combustion was slightly increased, although the IMEP was slightly decreased. The unburned gas temperature for PREMIER combustion increases as a function of the CO2 content of the mixture. Due to compression by flame propagation, high unburned gas temperatures in dual-fuel gas engines are important for achieving autoignition inside the end-gas region under PREMIER combustion conditions.

    DOI: 10.1016/j.fuel.2020.119330

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  • End-gas autoignition characteristics of PREMIER combustion in a pilot fuel-ignited dual-fuel biogas engine Reviewed

    Alireza Valipour Berenjestanaki, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    FUEL   254   115634   2019.10

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    To improve the thermal efficiency of internal combustion engines at high loads, premixed mixture ignition in the end-gas region (PREMIER) combustion is proposed as a precursor to knocking. In the current work, a pilot fuelignited dual-fuel gas engine was operated at constant speed under different intake pressures (101, 150, and 200 kPa). A simulated biogas was served as the primary fuel and diesel as the pilot fuel. The maximum mean effective pressure and thermal efficiency were evident during PREMIER operation because of autoignition in the end-gas region. Similar to knocking combustion, PREMIER combustion features two stages but neither pressure oscillation nor a rapid pressure rise is observed. We here define a new parameter, the PREMIER intensity (PI), which reflects the strength of PREMIER combustion. As the injection timing was advanced and the pressure boosted, more cycles underwent end-gas autoignition; the associated heat release increased and, consequently, the PI value rose. When the pressure and temperature of a premixed fuel mixture rose as injection timing was advanced, end-gas autoignition commenced earlier. The end-gas autoignition delay became shorter as intake pressure was increased and injection timing advanced.

    DOI: 10.1016/j.fuel.2019.115634

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  • Influence of particle diameter on numerical PIV measurement using DNS data of turbulent premixed flame Reviewed

    Yusei Naka, Kazuya Tsuboi, Eiji Tomita, Tatsuya Hasegawa

    12th Asia-Pacific Conference on Combustion, ASPACC 2019   ASPACC2019-1469   2019.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

    Currently, practical combustors have some problems such as low efficiency and high emissions with harmful effects. To resolve these issues, it is necessary to understand the detailed local flame structure. This study focuses on PIV capable of measuring local flow velocity describing the flame structure. Also, the detailed flame structure could be analyzed by DNS. However, the analysis method of the local flame structure differs between numerical simulations and experimental measurements. Therefore, the quantitative evaluation of the relationship between experimental and numerical analyses still remains in doubt. In this study, PIV analysis was performed in a computational domain with the DNS data of turbulent premixed flames and the local flow velocities from both numerical PIV and DNS were obtained. In the higher density ratio of unburned mixture to burned product, changing the particle diameter under the same condition of the total of brightness in a measurement region, the correlation coefficient became high when the particle diameter was large. This is because the difference in brightness between pixels increases with the particle diameter. In addition, the correlation coefficient increased as the density ratio decreased. This is because the number of particles in the burned side decreases as the density ratio increases.

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  • Evaluation of Combustion Characteristics of Ultra Low Sulphur Fuel Oil by Using OCA (Optical Combustion Analyzer) and a Two Stroke Test Diesel Engine(共著) Reviewed

    Eiji Tomita, Yuya KUBOTA, Nobuyuki KAWAHARA, Kazuya TSUBOI, Ken MIYACHI, Morio KONDO

    The 29th CIMAC Congress 2019   181   2019.6

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  • Differences between PREMIER combustion in a natural gas spark-ignition engine and knocking with pressure oscillations Reviewed

    Nobuyuki Kawahara, Yungjin Kim, Hisashi Wadahama, Kazuya Tsuboi, Eiji Tomita

    PROCEEDINGS OF THE COMBUSTION INSTITUTE   37 ( 4 )   4983 - 4991   2019

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE INC  

    PREMIER (PREmixed Mixture Ignition in the End-gas Region) combustion occurs with auto-ignition in the end-gas region when the main combustion flame propagation is nearly finished. Auto-ignition is triggered by the increases in pressure and temperature induced by the main combustion flame. Similarly to engine knocking, heat is released in two stages when engines undergo this type of combustion. This pattern of heat release does not occur during normal combustion. However, engine knocking induces pressure oscillations that cause fatal damage to engines, whereas PREMIER combustion does not. The purpose of this study was to elucidate PREMIER combustion in natural gas spark-ignition engines, and differentiate the causes of knocking and PREMIER combustion. We applied combustion visualization and in-cylinder pressure analysis using a compression-expansion machine (CEM) to investigate the auto-ignition characteristics in the end-gas region of a natural gas spark-ignition engine. We occasionally observed knocking accompanied by pressure oscillations under the spark timings and initial gas conditions used to generate PREMIER combustion. No pressure oscillations were observed during normal and PREMIER combustion. Auto-ignition in the end-gas region was found to induce a secondary increase in pressure before the combustion flame reached the cylinder wall, during both knocking and PREMIER combustion. The auto-ignited flame area spread faster during knocking than during PREMIER combustion. This caused a sudden pressure difference and imbalance between the flame propagation region and the end-gas region, followed by a pressure oscillation. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.proci.2018.08.055

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  • Construction of Numerical Measurement Using DNS Data of Turbulent Premixed Flames Reviewed

    Kazuya Tsuboi, Takahiro Tomeda, Eiji Tomita, Tatsuya Hasegawa

    The Ninth JSME-KSME Thermal and Fluids Engineering Conference   TFEC9-1540   2017.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Extension of PREMIER combustion operation range using split micro pilot fuel injection in a dual fuel natural gas compression ignition engine: A performance-based and visual investigation Reviewed

    Cagdas Aksu, Nobuyuki Kawahara, Kazuya Tsuboi, Morio Kondo, Eiji Tomita

    FUEL   185   243 - 253   2016.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    The effects of split pilot fuel injection on engine performance and PREmixed Mixture Ignition in the End Gas Region (PREMIER) combustion characteristics were investigated in a single-cylinder dual-fuel natural gas engine ignited with diesel fuel. In particular, the effect of second spray timing on combustion mode was examined. PREMIER combustion was observed in a wider range of operating conditions with split injection strategy compared to single injection strategy. We determined that it was possible to both decelerate heat release and suppress knocking to PREMIER combustion, and accelerate heat release and promote normal combustion to PREMIER combustion, with suitable second injection timing. The maximum of thermal efficiency of PREMIER combustion operation with split injection was close to the results obtained with knocking operation. In-cylinder images showed that split injection strategy advances or retards the progress of combustion by controlling the size and rate of growth of flame kernels, depending on the timing of the second injection. The combustion progress is earlier when the pilot fuel delivered during the first injection autoignites during the second injection. Kernel growth and the final size were adversely affected when the second injection was initiated after pilot fuel autoignition. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.fuel.2016.07.120

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  • Combustion characteristics and NOx emissions of biogas fuels with various CO2 contents in a micro co-generation spark-ignition engine Reviewed

    Yungjin Kim, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    APPLIED ENERGY   182   539 - 547   2016.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    Biogas is a renewable alternative fuel for internal combustion engines that has several advantages over conventional fuels, including lower costs and reduced levels of harmful emissions. In particular, it exhibits a neutral recirculation loop for carbon dioxide (CO2), which is one of the main causes of global warming. In this study, we investigated biogas fuels with various compositions using a micro co-generation engine system. The ratio of methane to CO2 and engine load were varied, and the intake air and fuel flow rates were controlled to change the equivalence ratio. The results show that for a given engine load, the ignition delay and combustion period increased with CO2 content, and the combustion speed decreased. The fuel consumption increased slightly with CO2 content; however, the thermal efficiency improved using a lean burn strategy, resulting in lower nitrogen oxide (NOx) emission, and moreover, the use of biogas with the stoichiometric air-fuel ratio appears effective in reducing NOx emissions and can improve the fuel economy at higher loads. (C) 2016 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.apenergy.2016.08.152

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  • Combustion characteristics of wet ethanol ignited using a focused Q-switched Nd:YAG nanosecond laser Reviewed

    Kazi Mostafijur Rahman, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    FUEL   165   331 - 340   2016.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCI LTD  

    Ethanol is a particularly promising bio-fuel, which is already widely used in the transportation sector. Much research has focused on laser ignition in internal combustion engines, because it offers a number of significant advantages. The motivation of this study is to reduce the higher cost of anhydrous ethanol by enabling the direct use of wet ethanol for combustion applications. This study reports the effects of water content on the laser ignition characteristics of air-ethanol flames with 0-40% water by volume added to the ethanol. Laser-induced breakdown was generated by focusing a 532-nm nanosecond pulse from a Q-switched Nd:YAG laser. High-speed visualisation of the combustion was achieved, together with analyses of the in-chamber pressure history, mass fraction burned, and ignition delay over a range of equivalence ratios. Removing the final 20% of water from ethanol is particularly energy intensive. The results of this investigation revealed that the flame growth rate and flame propagation velocity are both increased by adding up to 20% water (by volume) to ethanol, indicating a positive effect of the water at relatively low concentrations. It was also found that the ignition delay was shorter as the water content was increased up to a volume fraction of 20%. Therefore, it can be hypothesised that the presence of water enhances the ionisation process and increases the rate of radical generation during laser-induced breakdown of wet ethanol. Numerical analysis using the commercial software package CHEMKIN-PRO revealed a reduction in adiabatic flame temperature and laminar burning velocity due to the addition of water to ethanol. (C) 2015 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.fuel.2015.10.067

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  • 1009 Evaluation of an experimental analysis method on the flame displacement speed using DNS data of turbulent premixed flames with different Lewis numbers Reviewed

    KATAYAMA Tatsuya, TSUBOI Kazuya, TOMITA Eiji

    The Proceedings of Conference of Chugoku-Shikoku Branch   2015   223 - 1_-_1009-2_   2015.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecs.2015.53._1009-1_

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  • Experimental study on combustion characteristics of wet ethanol ignited by Laser-induced breakdown Reviewed

    Kazi Mostafijur Rahman, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    Laser Ignition Conference, LIC 2015   W3A.2   2015.4

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    Laser ignition of wet ethanol was carried out at equivalence ratio of 0.8. Additions of water in ethanol up to 20% (v/v) accelerated the combustion rate with shorter laser ignition delay compared to dehydrated ethanol.

    DOI: 10.1364/lic.2015.w3a.2

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  • Effect of ambient pressure on local concentration measurement of transient hydrogen jet in a constant-volume vessel using spark-induced breakdown spectroscopy Reviewed

    Md Tasyrif Abdul Rahman, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   40 ( 13 )   4717 - 4725   2015.4

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    We report an investigation of the effects of the ambient pressure on fuel concentration measurements of an injected jet of hydrogen using spark-induced breakdown spectroscopy (SIBS) in a constant-volume vessel. Measurements were carried out using hydrogen injected into a nitrogen environment with different ambient pressures, and the local concentrations were measured at various spark locations. The optical emission from the spark discharge at 501 nm (corresponding to nitrogen) and 656 nm (corresponding to hydrogen) was observed using SIBS. Spectrally resolved emission from the plasma was detected simultaneously using a spectrometer. The potential to determine the hydrogen/nitrogen ratio in the spark gap using was demonstrated. Spectral calibration was carried out using a hydrogen/nitrogen mixture, and hydrogen was injected at a pressure of 5.0 MPa into nitrogen with ambient pressures in the range 0.5-1.5 MPa. The results show an increase in the background radiation, as well as of the peaks corresponding to hydrogen and nitrogen atomic emission lines, as the ambient pressure increased. An increase in the density of nitrogen inside the chamber influenced the structure of the hydrogen jet, slowing the spray and reducing penetration, which altered the equivalence ratio at the location of the spark. When the spark occurred during injection, the behavior of the hydrogen jet was quasi-steady state; when the spark timing followed the injection, however, an unsteady state was observed. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijhydene.2015.01.121

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  • Effect of Hydrogen Concentration on Engine Performance, Exhaust Emissions and Operation Range of PREMIER Combustion in a Dual Fuel Gas Engine Using Methane-Hydrogen Mixtures Reviewed

    Cagdas Aksu, Nobuyuki Kawahara, Kazuya Tsuboi, Shun Nanba, Eiji Tomita, Morio Kondo

    JSAE/SAE 2015 International Powertrains, Fuels & Lubricants Meeting   JSAE20159176 / SAE2015-01-1792   2015

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  • Visualization and concentration measurement of a direct-injection hydrogen jet in a constant-volume vessel using spark-induced breakdown spectroscopy Reviewed

    Md Tasyrif Abdul Rahman, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   39 ( 31 )   17896 - 17905   2014.10

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    In this work, spark-induced breakdown spectroscopy (SIBS) was employed to investigate the mixing process of a hydrogen jet in a constant-volume vessel. The local fuel concentration of the hydrogen jet was measured at several locations, using a SIBS sensor. A high-speed camera was used to visualize spark discharge fluctuations, and hydrogen jet concentration measurements were conducted simultaneously. Spectrally resolved atomic emissions from the plasma generated by the spark plug were examined to determine the local equivalence ratio. Direct visualization of the spark discharge provided useful information about the influence of spark discharge characteristics related to the spark timing. Using the developed SIBS sensor, atomic emission spectra were obtained from hydrogen H-alpha at 656 nm and nitrogen N (I) at 501 nm. Comparison of the intensity peaks of atomic emissions from hydrogen and nitrogen allows the local hydrogen concentration in a measured volume to be determined, and hence also the local equivalence ratio. The measurement results demonstrate the local variation in the equivalence ratio throughout the jet and along its axis. From the results, the spatial structure of the hydrogen jet affects the hydrogen/nitrogen mixing and could be clarified with SIBS technique when the spark is discharged. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijhydene.2014.08.146

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  • Consideration on the Flow Velocity in the Experimental Analysis of the Flame Displacement Speed Using DNS Data of Turbulent Premixed Flames with Different Lewis Numbers Reviewed

    Kazuya Tsuboi, Shingo Morishita, Eiji Tomita

    Open Journal of Fluid Dynamics   4 ( 3 )   278 - 287   2014.9

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    DOI: 10.4236/ojfd.2014.43021

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  • DNS Analysis on the Indirect Relationship between the Local Burning Velocity and the Flame Displacement Speed of Turbulent Premixed Flames Reviewed

    Kazuya Tsuboi, Eiji Tomita

    Open Journal of Fluid Dynamics   4 ( 3 )   288 - 297   2014.9

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    DOI: 10.4236/ojfd.2014.43022

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  • Evaluation of the Local Burning Velocity Using DNS Data of Turbulent Premixed Flames Reviewed

    Kazuya Tsuboi, Ryoji Matsugi, Eiji Tomita

    Natural Science   6 ( 12 )   1030 - 1036   2014.8

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    DOI: 10.4236/ns.2014.612093

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  • Laser Ignition Characteristics of Hydrous Ethanol Reviewed

    Kazi Mostafijur Rahman, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    The 2nd Laser Ignition Conference   LIC3-5   2014.4

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  • Laser-induced plasma generation and evolution in a transient spray Reviewed

    Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    OPTICS EXPRESS   22 ( 1 )   A44 - A52   2014.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:OPTICAL SOC AMER  

    The behaviors of laser-induced plasma and fuel spray were investigated by visualizing images with an ultra-high-speed camera. Timeseries images of laser-induced plasma in a transient spray were visualized using a high-speed color camera. The effects of a shockwave generated from the laser-induced plasma on the evaporated spray behavior were investigated. The interaction between a single droplet and the laser-induced plasma was investigated using a single droplet levitated by an ultrasonic levitator. Two main conclusions were drawn from these experiments: (1) the fuel droplets in the spray were dispersed by the shockwave generated from the laser-induced plasma; and (2) the plasma position may have shifted due to breakdown of the droplet surface and the lens effect of droplets. (C) 2013 Optical Society of America

    DOI: 10.1364/OE.22.000A44

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  • Chemical Effects on Turbulent Premixed Flames nearby a Wall Surface(共著) Reviewed

    Kazuya Tsuboi, Eiji Tomita, Tatsuya Hasegawa

    24th International Colloquium on the Dynamics of Explosions and Reactive Systems   187   2013.8

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  • DNS including the Chemical Process on a Solid Surface in Turbulent Premixed Flames Reviewed

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of the Eighth KSME-JSME Thermal and Fluids Engineering Conference   GST04-012   2012.3

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  • Multidimensional CFD simulation of syngas combustion in a micro-pilot-ignited dual-fuel engine using a constructed chemical kinetics mechanism Reviewed

    Ulugbek Azimov, Masahiro Okuno, Kazuya Tsuboi, Nobuyuki Kawahara, Eiji Tomita

    INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   36 ( 21 )   13793 - 13807   2011.10

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    A multidimensional computational fluid dynamics (CFD) simulation of a constructed syngas chemical kinetic mechanism was performed to evaluate the combustion of syngas in a supercharged dual-fuel engine for various syngas initial compositions under lean conditions. The modelled results were validated by comparing predictions against corresponding experimental data for a supercharged dual-fuel engine. The predicted and measured in-cylinder pressure, temperature, and rate of heat release (ROHR) data were in good agreement. The effect of the hydrogen peroxide chain-propagation reaction on the progress of combustion under supercharged conditions was examined for different types of syngas using various initial H-2 concentrations. The effect of the main syngas kinetic mechanism reactions on the combustion progress was analysed in terms of their contribution to the total heat of the reaction. The best results compared with experimental data were obtained in the range of equivalence ratios below about 0.8 for all types of syngas considered in this paper. As the equivalence ratio increased above 0.8, the results deviated from the experiment data. The spatial distribution of the in-cylinder temperature and OH center dot within this equivalence-ratio range showed the completeness of the combustion. The present CFD model captured the overall combustion process well and could be further developed into a useful tool for syngas-engine combustion simulations. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijhydene.2011.07.140

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  • DNS ANALYSIS ON LOCAL BURNING VELOCITY AND FLAME DISPLACEMENT SPEED OF TURBULENT PREMIXED FLAMES WITH DIFFERENT DENSITY RATIO Reviewed

    Kazuya Tsuboi, Tatsuya Hasegawa

    PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011, VOL 2   719 - +   2011.3

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    To investigate the relationship between local burning velocity and flame displacement speed with different density ratio, a numerical analysis was performed using DNS databases of statistically steady and fully developed turbulent premixed flames. The local burning velocity based on fuel consumption rate is considered to be most appropriate as the definition of burning rate because combustion is a kind of chemical reactions. Since it is impossible, however, that the local burning velocity is obtained experimentally by using any present measurement technology, the numerical results using the local burning velocity cannot be compared with any experimental data. Hence the flame displacement speed, which can be obtained and compared easily with experiments, has previously been used for numerical analyses. Thus, to realize comparison of numerical results using the local burning velocity with some experimental ones, it is necessary to reveal the relationship between the local burning velocity and the flame displacement speed.

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  • Local burning velocity and flame displacement speed of turbulent premixed flames using DNS database with different Lewis number(共著) Reviewed

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of the 8th Asia-Pacific Conference on Combustion   75 - 78   2010.12

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  • Evaluation of the Flame Lift-off Length in Diesel Spray Combustion Based on Flame Extinction Reviewed

    Ulugbek Azimov, Nobuyuki Kawahara, Eiji Tomita, Kazuya Tsuboi

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   5 ( 2 )   238 - 251   2010.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    The interaction of spray and combustion processes forms a complex system of physical phenomena undergoing in IC engines. Studying this interaction is important to determine strategies for simultaneously reducing soot and NOx emissions from diesel engines. Spray combustion interactions are evaluated by the flame lift-off length - the distance from the injector orifice to the location of hydroxyl luminescence closest to the injector in the flame jet. Various works have been dedicated to successful simulations of lifted flames of a diesel jet by use of various combustion modeling approaches. In this work, flame surface density and flamelet concepts were used to model the diesel lift-off length. Numerical studies have been performed with the ECFM3Z model and n-Heptane fuel to determine the flame lift-off length under quiescent conditions. The numerical results showed good agreement with experimental data, which were obtained from an optically accessible constant volume chamber and presented at the Engine Combustion Network (ECN) of Sandia National Laboratories. It was shown that at a certain distance downstream from the injector orifice, stoichiometric scalar dissipation rate matched the extinction scalar dissipation rate. This computed extinction scalar dissipation rate correlated well with the flame lift-off length. For the range of conditions investigated, adequate quantitative agreement was obtained with the experimental measurements of lift-off length under various ambient gas O-2 concentrations and ambient gas densities.

    DOI: 10.1299/jtst.5.238

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  • DNS analysis on correlation between local burning velocity and local stretch rate for turbulent premixed flames with different lewis numbers Reviewed

    K. Tsuboi, T. Hasegawa

    7th Asia-Pacific Conference on Combustion, ASPACC 2009   208   2009.5

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    To investigate the effect of Lewis number on local burning velocity and stretch rate, a numerical analysis was performed using DNS databases of statistically steady and fully developed turbulent premixed flames. In our previous study, it was found that a probability density function (pdf) of local burning velocity is affected by Lewis number and especially the pdf for lower Lewis number had a wide distribution. To explain the above results, the present work focused on the correlation between local burning velocity and each of local stretch rate, local tangential strain rate and local flame curvature.

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  • Statistical Analysis on Turbulent Premixed Flames Using DNS Reviewed

    Kazuya Tsuboi, Tatsuya Hasegawa

    DNS and LES of Reacting Flows   27 - 28   2008.10

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  • Statistical Analysis of Turbulent Premixed Flames Using DNS Reviewed

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of The Seventh JSME-KSME Thermal and Fluids Engineering Conference (TFEC7)   C143   2008.10

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  • An Analysis on local burning velocities of turbulent premixed flames using DNS databases Reviewed

    Kazuya Tsuboi, Tatsuya Hasegawa

    32nd International Symposium on Combustion   90 - 90   2008.8

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  • Modelling of the correlation between velocity and reactive scalar gradients in turbulent premixed flames based on DNS data Reviewed International coauthorship International journal

    Arnaud Mura, Kazuya Tsuboi, Tatsuya Hasegawa

    COMBUSTION THEORY AND MODELLING   12 ( 4 )   671 - 698   2008.8

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    The interaction between turbulence and reactive scalar fields is discussed for the wrinkled flamelets regime of turbulent premixed combustion. Emphasis is placed on the effects associated with the turbulent straining term. In the regime of turbulent combustion under consideration, which corresponds to Karlovitz and Damkohler numbers such that Ka < 1 and Da > 1, a clear and simple formulation is proposed to explain and to model the influence of the correlation between velocity and reactive scalar gradients. This formulation is based on the conservative variables budget across one-dimensional premixed laminar flamelets. The analysis firmly confirms the dependence on both the Damkohler number and the expansion factor, a feature already foreseen in recent studies. Nevertheless, in contrast with previous work, (i) the scaling arguments used in the present contribution are different from those used in other recent proposals, and (ii) the proposed closures are not only deduced from dimensional arguments but also from the consideration of conservative variable budgets across laminar flamelets. The resulting functional dependence on the expansion factor is found to be influenced by the underlying one-dimensional flamelet representation and two possible closures are put forward to take this dependence into account. (iii) The two closures do not exhibit a proportionality to the mean scalar dissipation rate (epsilon) over tilde (Y) as suggested in previous studies but to the square of this quantity. This results in the presence of a second contribution proportional to (epsilon) over tilde (2)(Y) in the modelled transport equation for the mean scalar dissipation rate, in addition to the modelled molecular dissipation term. (iv) Since previous Direct Numerical Simulation (DNS) studies have been essentially devoted to the influence of the Damkohler number, the present DNS validation step is focused on the effects of the expansion rate. To this purpose, the proposed models are validated against three available DNS databases obtained for turbulent premixed flames with different values of the density ratio between unburned and fully burned gases.

    DOI: 10.1080/13647830801975154

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  • An Analysis of Local Quantities of Turbulent Premixed Flames Using DNS Databases Reviewed

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   3 ( 1 )   103 - 111   2008.2

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    A numerical analysis was performed using DNS (Direct Numerical Simulation) databases of statistically steady and fully developed turbulent premixed flames with different density ratios and with different Lewis numbers. Firstly, local flame surfaces at a prescribed progress variable were identified as local three-dimensional polygons. And then the polygon was divided into some triangles and local flame areas were evaluated. The turbulent burning velocity was evaluated using the ratio of the area of a turbulent flame to that of a planar flame and compared with the turbulent burning velocity obtained by the reaction rate. As a result, for unity Lewis number, the turbulent burning velocity evaluated by the flame area agrees with that by the reaction rate independent of the density ratio, while for non-unity Lewis number, the turbulent burning velocity obtained by the reaction rate increases or decreases by the extent which the Lewis number contributes. Secondary, local burning velocities over the flame surface were evaluated, and then the probability density functions (pdfs) of local burning velocities were obtained. For Le = 0.8, 1.0, the peak of the pdf is located at a higher value than the unstretched local burning velocity, while for Le = 1.2, it is located at a lower value than the unstretched local burning velocity.

    DOI: 10.1299/jtst.3.103

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  • Local structure of turbulent premixed flames obtained by DNS Reviewed

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    Proceedings of International Symposium on EcoTopia Science 2007   236 - 239   2007.11

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  • An analysis of local quantities of turbulent premixed flames using DNS databases Reviewed

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    PROCEEDINGS OF THE ASME/JSME THERMAL ENGINEERING SUMMER HEAT TRANSFER CONFERENCE 2007, VOL 1   1   623 - 629   2007.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:AMER SOC MECHANICAL ENGINEERS  

    An analysis of local flame area was performed using DNS (Direct Numerical Simulation) databases of turbulent premixed flames with different density ratios and with different Lewis numbers. Firstly, a local flame surface at a prescribed progress variable was identified as a local three-dimensional polygon. And then the polygon was divided into some triangles and local flame area was evaluated. The turbulent burning velocity was evaluated using the ratio of the area of turbulent flame to that of planar flame and compared with the turbulent burning velocity obtained by the reaction rate.

    DOI: 10.1115/HT2007-32794

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  • Local Quantities Analysis of Turbulent Premixed Flames Using DNS Databases Reviewed

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    Proceedings of the 21st International Colloquium on the Dynamics of Explosions and Reactive Systems   88   2007.7

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  • Small scale reactive scalar dynamics in turbulent premixed flames Part I: mean reactive scalar dissipation Reviewed International coauthorship International journal

    Arnaud Mura, Vincent Robin, Michel Champion, Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of the 21st International Colloquium on the Dynamics of Explosions and Reactive Systems   126   2007.7

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  • Analysis of local quantities of turbulent premixed flames using DNS databases Reviewed

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    6th Asia-Pacific Conference on Combustion, ASPACC 2007   348 - 351   2007.5

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    An analysis of local flame area was performed using DNS databases of turbulent premixed flames with different density ratios and with different Lewis numbers. A local flame surface at a prescribed progress variable was identified as a local three-dimensional polygon. The polygon was divided into some triangles and local flame area was evaluated. The turbulent burning velocity was evaluated using the ratio of the area of turbulent flame to that of planar flame and compared with the turbulent burning velocity obtained by the reaction rate.

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  • Direct numerical simulations for intrinsic instabilities of remixed planar flames Reviewed

    K Tsuboi, G Masuya

    COMBUSTION SCIENCE AND TECHNOLOGY IN ASIA-PACIFIC AREA: TODAY AND TOMORROW   136 - 139   2003.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SOUTHEAST UNIV PRESS  

    Direct numerical simulations were implemented and studied for the intrinsic instabilities of two dimensional premixed planar hydrogen/air flames. The 6th-order compact finite difference scheme was used for the spatial discretization, and the 3rd-order Runge-Kutta method for the time advancement. The boundary conditions were based on the Navier-Stokes characteristic boundary conditions. The hydrogen/air detailed kinetics, which contains 9 species and 35 elementary reactions, was used. Small perturbation was imposed at the upstream boundary of calculation domain (a rectangle), the evolution of a flame was investigated. The flame became unstable due to the Darrieus-Landau instability. After-wards, a cusp, which was a concave part towards the unburned gas, appeared, and then was closing. These are considered to be due to the diffusive-thermal instability. Furthermore in order to investigate the effect of the size of computation domain on the evolution of flames, calculations were conducted in the different sizes.

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  • Direct Numerical Simulations for the Effects of Small Perturbation on the Intrinsic Instabilities of Two-dimensional Hydrogen/air Premixed Flames Reviewed

    TSUBOI, Kazuya, MASUYA,Goro

    Joumal of the Combustion Society of Japan   45 ( 133 )   184 - 190   2003.8

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Combustion Society of Japan  

    <p>Direct numerical simulations were implemented and studied for the intrinsic instabilities of two-dimensional hydrogen/air premixed planar flames. The 6th-order compact finite difference scheme was used for the spatial discretization, and the 3rd-order Runge-Kutta method for the time advancement. The boundary conditions were based on the Navier-Stokes characteristic boundary conditions. The hydrogen/air detailed kinetics, which contains 9 species and 35 elementary reactions, was used. Small perturbation was imposed at the upstream boundary of the calculation domain (a rectangle), and then the perturbation grew up when it reached a planar flame. The flame became unstable due to the intrinsic instabilities. Afterwards, a cusp, which was a concave part towards the unburned gas, appeared, and developed rapidly. It is considered to be due to the diffusive-thermal instability. And then, the cusp was closing, while a convex part towards the unburned gas appeared. This is considered as a cellular structure. The dispersion relation between the wave number and the growth rate of the perturbation was obtained and compared with a theoretical prediction. The behaviour of the flame was qualitatively similar to one obtained in past experiments. Furthermore the results with the perturbation imposed continuously and in a limited time were compared.</p>

    DOI: 10.20619/jcombsj.45.133_184

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  • A study of thermal effect depending on temperature field adjacent to turbulent premixed flames using DNS

    TSUBOI Kazuya, MATSUKA Takao

    The Proceedings of Mechanical Engineering Congress, Japan   2022   S061-05   2022

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Turbulent premixed flames are heat release phenomena in the turbulent flow with premixed fuel and oxidiser. Turbulent premixed flames form the temperature field and are affected by the interaction between flow and heat. This study focused the temperature field adjacent to the flames and considered the effect of the interaction between flow and heat on the flames using DNS (Direct numerical simulation). In the development of planar flame in the turbulence field, the results show that spread of the flame zone leads to enhancement of the effect of turbulence field on the isosurface of temperature upstream of flames, and that the distribution of heat conduction does not deviate from the isosurface of temperature in the case of small wrinkles on the isosurface of temperature.

    DOI: 10.1299/jsmemecj.2022.s061-05

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  • Numerical investigation on the effects of injector internal flow on cavitation generation

    YANAGI Naoki, TSUBOI Kazuya

    The Proceedings of Conference of Chugoku-Shikoku Branch   2022.60   07a1   2022

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecs.2022.60.07a1

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  • Construction of DNS on the intrinsic instabilities of hydrogen/air premixed flames without the effect of computational boundary

    上原弘之, 坪井和也, 冨田栄二

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021.3

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  • Efforts to Improve Measurement Accuracy by Numerical Laser Tomography Method Using DNS Data

    松家隆雄, 坪井和也, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集(CD-ROM)   58th   2020

  • Progress towards establishment of numerical laser tomography method for DNS data of turbulent premixed flames

    坪井和也, 花浴匡維, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集(CD-ROM)   57th   2019

  • 光学的燃焼可視化装置による燃料噴射ノズル内部の旋回流が燃焼特性に及ぼす影響の調査

    山下裕雅, 河原伸幸, 坪井和也, 冨田栄二, 藤井幹, 森中和宏

    マリンエンジニアリング学術講演会講演論文集   89th   2019

  • Advanced Combustion in Natural Gas-Fueled Engines Reviewed

    Ulugbek Azimov, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    Energy, Environment, and Sustainability   215 - 250   2019

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    Language:English   Publisher:Springer Singapore  

    Current energy and emission regulations set the requirements to increase the use of natural gas in engines for transportation and power generation. The characteristics of natural gas are high octane number, less amount of carbon in the molecule, suitable to lean combustion, less ignitibility, etc. There are some advantages of using natural gas for engine combustion. First, less carbon dioxide is emitted due to its molecular characteristics. Second, higher thermal efficiency is achieved owing to the high compression ratio compared to that of gasoline engines. Natural gas has higher octane number so that knock is hard to occur even at high compression ratios. However, this becomes a disadvantage in homogeneous charge compression ignition (HCCI) engines or compression ignition engines because the initial auto-ignition is difficult to be achieved. When natural gas is used in a diesel engine, primary natural gas–air mixture is ignited with small amount of diesel fuel. It was found that under high pressure, lean conditions, and with the control of certain parameters, the end gas is auto-ignited without knock and improves the engine combustion efficiency. Recently, some new fuel ignition technologies have been developed to be applied to natural gas engines. These are the laser-assisted and plasma-assisted ignition systems with high energy and compact size.

    DOI: 10.1007/978-981-13-3307-1_8

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  • LESによる舶用ディーゼルインジェクタ内部構造が噴孔内キャビテーションに及ぼす影響

    牧野琢巳, 坪井和也, 冨田栄二, 藤井幹, 森中和宏

    マリンエンジニアリング学術講演会講演論文集   88th   2018

  • Study on Sub-Pixel Interpolation of Numerical PIV Measurement for Turbulent Premixed Flames Using DNS Data

    中雄誠, 坪井和也, 冨田栄二, 長谷川達也

    日本機械学会熱工学コンファレンス講演論文集(CD-ROM)   2018   2018

  • 光学的燃焼可視化装置(OCA)による極低硫黄燃料油の着火性および燃焼性の評価

    窪田裕也, 冨田栄二, 河原伸幸, 坪井和也, 宮地健, 近藤守男

    マリンエンジニアリング学術講演会講演論文集   88th   2018

  • Study towards Establishment of Numerical Laser Tomography Method for Turbulent Premixed Flames Using DNS Data

    花浴匡維, 坪井和也, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集   56th   2018

  • The Construction of Numerical Laser Tomography Method Using DNS Data of Turbulent Premixed Flames

    花浴匡維, 坪井和也, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集   55th   2017

  • ルイス数の異なるDNSデータを用いた乱流予混合火炎の数値計測

    坪井和也, 留田貴弘, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集   54th   2016

  • 1011 Effect of boundary conditions on flame intrinsic instabilities using two-dimensional DNS

    TOKUSHIGE Kazuki, TSUBOI Kazuya, TOMITA Eiji

    The Proceedings of Conference of Chugoku-Shikoku Branch   2015 ( 53 )   "1011 - 1"-"1011-2"   2015.2

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    DOI: 10.1299/jsmecs.2015.53._1011-1_

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  • J0550401 Simulated PIV measurement of the local flow velocity in turbulent combustion using DNS data

    TOMEDA Takahiro, TSUBOI Kazuya, TOMITA Eiji

    The Proceedings of Mechanical Engineering Congress, Japan   2015   _J0550401 - -_J0550401-   2015

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    It is necessary for the control of turbulent combustion to investigate the local flame structure and combustion properties. However, the detailed local flame structure has yet to be elucidated. Local flow velocity are necessary to evaluate flame stretch rate and strain rate in relation to the flame structure. The evaluation methods of these properties are different in numerical and experimental analyses: in the numerical analyses, direct numerical simulation (DNS) is used, while in the experimental analyses, visualization techniques are needed. Therefore, it is difficult to compare the results obtained from both techniques and to evaluate quantitative relationships. In this study, the differences between the experimental and numerical analyses on local flow velocity were investigated. The Particle Image Velocimetry (PIV) analysis was performed with the DNS data of hydrogen/air turbulent premixed flames. As a result, the vector map and probability density function (PDF) of the local flow velocity obtained from simulated PIV system is in good agreement with those from DNS.

    DOI: 10.1299/jsmemecj.2015._J0550401-

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  • ルイス数の異なるDNSデータを用いた火炎変位速度の実験解析手法に関する評価

    片山達哉, 坪井和也, 冨田栄二

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   53rd   2015

  • 乱流予混合火炎のDNSデータを用いた局所火炎構造に関する模擬PIVによる数値計測

    留田貴弘, 坪井和也, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集   53rd   2015

  • The use of direct numerical simulations (DNS) on combustion - evaluation of experimental analysis methods - Invited Reviewed

    Kazuya Tsuboi

    Journal of the Japan Society of Mechanical Engineers   117 ( 1148 )   479 - 479   2014.7

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    DOI: 10.1299/jsmemag.117.1148_479

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  • 乱流予混合火炎の3次元DNSデータを用いた2次元火炎変位速度の実験解析手法に関する評価と検討

    坪井和也, 森下真吾, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集   52nd   2014

  • 213 Effect of thermochemical conditions adjacent to a solid wall surface on hydrogen/air turbulent premixed flames

    TSUBOI Kazuya, TOMITA Eiji, HASEGAWA Tatsuya

    The Computational Mechanics Conference   2013 ( 26 )   "213 - 1"-"213-2"   2013.11

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    DOI: 10.1299/jsmecmd.2013.26._213-1_

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  • G061055 A study on experimental analysis method of flame displacement speed using DNS database of turbulent premixed flame

    MORISHITA Shingo, TSUBOI Kazuya, TOMITA Eiji

    Mechanical Engineering Congress, Japan   2013   "G061055 - 1"-"G061055-5"   2013.9

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    The relation of the flame displacement speeds of turbulent premixed flame obtained by both of an experimental analysis method and a numerical calculation was researched using the three-dimensional DNS database of the turbulent premixed flame. The two-dimensional flame displacement speed is experimentally evaluated by a laser sheet imaging approach. In this study, firstly, the flame displacement speeds were obtained by the numerical calculation using both the three-dimensional set and the two-dimensional component of DNS data, and were compared. It was found that negative flame displacement speed appeared only in the two-dimensional calculation. Secondly, the flame displacement speed was evaluated by the analysis method imitated experimental imaging approach, and was compared with the two-dimensional flame displacement speed obtained by the numerical calculation. As a result, it was found that the statistics of the flame displacement speed differed depending on the way to consider the local velocity in experimental analyses.

    DOI: 10.1299/jsmemecj.2013._G061055-1

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  • 軽油着火式二元燃料ガスエンジンにおける筒内燃焼の数値解析-Syngas化学反応機構のバイオガス燃焼への適用-

    河副瑠惟, 河原伸幸, 冨田栄二, 坪井和也, 脇坂知行, 近藤守男

    内燃機関シンポジウム講演論文集(CD-ROM)   24th   2013

  • 火炎変位速度の実験的解析手法に関する乱流予混合火炎の3次元DNSデータを用いた評価

    森下真吾, 坪井和也, 冨田栄二

    燃焼シンポジウム講演論文集   51st   2013

  • 固体壁面とその近傍での熱化学的条件が水素-空気乱流予混合火炎に及ぼす影響

    坪井和也, 冨田栄二, 長谷川達也

    日本機械学会計算力学講演会論文集(CD-ROM)   26th   2013

  • C115 DNS of Hydrogen-air Premixed Flames with Thermochemical Conditions onto the Solid Surface

    Tsuboi Kazuya, Tomita Eiji, Hasegawa Tatsuya

    Procee[d]ings of Thermal Engineering Conference   2012   75 - 76   2012.11

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    Various turbulent combustion models are currently used with RANS (Reynolds-Averaged Navier-Stokes Simulation) or LES (Large Eddy Simulation) for the analyses and developments of IC (internal combustion) engines. Their models are, however, insufficient for their analyses and developments because the models are constructed by considering only the combustion in the gas phase without considering the chemical process on the internal surface of engine cylinder. In actual IC engines, the effects of chemical process on solid surfaces on the combustion should not be negligible because the combustion takes place in a very small volume surrounded by cylinder liner, cylinder head and piston. In this study, DNS (Direct Numerical Simulation) of premixed flames with a detailed chemical kinetics of hydrogen/air including the chemical processes in the bulk and on the solid surface were implemented. It was found that heat release rate near the wall increased temporally in the case of both a turbulent flame and a planar flame. This may be due to the Lewis number effect or adiabatic wall condition.

    DOI: 10.1299/jsmeted.2012.75

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  • G060011 Effects of chemical processes adjacent to a solid surface on hydrogen-air premixed flames

    TSUBOI Kazuya, TOMITA Eiji, HASEGAWA Tatsuya

    Mechanical Engineering Congress, Japan   2012   "G060011 - 1"-"G060011-3"   2012.9

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    Various turbulent combustion models are currently used with RANS (Reynolds-Averaged Navier-Stokes Simulation) or LES (Large Eddy Simulation) for the analyses and developments of IC (internal combustion) engines. Their models are, however, insufficient for their analyses and developments because the models are constructed by considering only the combustion in the gas phase without considering the chemical process on the internal surface of engine cylinder. In actual IC engines, the effects of chemical process on solid surfaces on the combustion should not be negligible because the combustion takes place in a very small volume surrounded by cylinder liner, cylinder head and piston. In this study, DNS (Direct Numerical Smilation) of premixed flames with a detailed chemical kinetics of hydrogen/air including the chemical processes in the bulk and on the solid surface were implemented. It was found that under the adiabatic wall conditions the flame adjacent to the adiabatic walls as solid surface quenches due to almost no existence of adsorbates.

    DOI: 10.1299/jsmemecj.2012._G060011-1

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  • 予混合圧縮自着火機関筒内現象の数値解析(燃料噴射時期が燃焼に与える影響)

    河原伸幸, 冨田栄二, 坪井和也, 高橋育子, 脇坂知行, 近藤守男

    日本機械学会・自動車技術会内燃機関シンポジウム講演論文集   23rd   2012

  • 固体壁面並びにその近傍での化学的過程を考慮した水素-空気乱流予混合火炎のDNS

    坪井和也, 冨田栄二, 長谷川達也

    燃焼シンポジウム講演論文集   50th   2012

  • 1302 Direct numerical simulation on appearance ofintrinsic instabilities in premixed planar flames

    Matsugi Ryoji, Tomita Eiji, Tsuboi Kazuya

    The Proceedings of Conference of Chugoku-Shikoku Branch   2011 ( 49 )   393 - 394   2011.2

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    DOI: 10.1299/jsmecs.2011.49.393

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  • 1301 Numerical Analysis on Combustion in a Dual-Fuel Gas Engine Cylinder

    Okuno Masahiro, Tsuboi Kazuya, Ulugbek Azimov, Tomita Eiji

    The Proceedings of Conference of Chugoku-Shikoku Branch   2011 ( 49 )   391 - 392   2011.2

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    DOI: 10.1299/jsmecs.2011.49.391

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  • 乱流予混合火炎における固体壁面での化学的過程に関するDNSによる検討

    坪井和也, 長谷川達也

    燃焼シンポジウム講演論文集   49th   2011

  • バイオガスを用いた二元燃料ガスエンジン筒内燃焼の数値解析

    田中雅高, 冨田栄二, 河原伸幸, 坪井和也, 脇坂知行

    燃焼シンポジウム講演論文集   49th   2011

  • 水素-空気予混合平面火炎における固有不安定性の励起に関する2次元DNS

    前田典宏, 坪井和也, 冨田栄二

    燃焼シンポジウム講演論文集   49th   2011

  • E114 Local burning velocity and flame displacement velocity in DNS analysis on turbulent premixed flames

    Tsuboi Kazuya, Hasegawa Tatsuya

    The Proceedings of the Thermal Engineering Conference   2010   125 - 126   2010

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    To investigate the relationship between local burning velocity and flame displacement speed with different density ratio, a numerical analysis was performed using DNS database of turbulent premixed flames. Since it is impossible that the local burning velocity is obtained experimentally, the numerical results using the local burning velocity cannot be compared with any experimental data. The flame displacement speed can be obtained and compared easily with experiments. Thus, to realize comparison of numerical results using the local burning velocity with some experimental ones, it is necessary to reveal the relationship between the local burning velocity and the flame displacement speed.

    DOI: 10.1299/jsmeted.2010.125

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  • 乱流予混合火炎における局所燃焼速度と火炎変位速度の関係

    坪井和也, 長谷川達也

    燃焼シンポジウム講演論文集   48th   2010

  • DNS Analysis on Correlation between Local Burning Velocity and Flame Stretch Rate

    TSUBOI Kazuya, HASEGAWA Tatsuya

    2009   90 - 90   2009

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    To investigate the effects of Lewis number on local burning velocity and stretch rate, a numerical analysis was performed using DNS databases of statistically steady and fully developed turbulent premixed flames. In our previous study, it was found that a probability density function (pdf) of local burning velocity is affected by Lewis number and especially the pdf for lower Lewis number had a wide distribution. To explain the above results, the present work focused on the correlation between local burning velocity and each of local stretch rate, local tangential strain rate and local flame curvature and on the distribution of reaction rates.

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  • 乱流予混合火炎のDNS解析における局所燃焼速度と火炎変位速度

    坪井和也, 長谷川達也

    燃焼シンポジウム講演論文集   47th   2009

  • 603 Local Quantities Analysis for Turbulent Premixed Flames Based on DNS

    TSUBOI Kazuya, NISHIKI Shinnosuke, HASEGAWA Tatsuya

    The Proceedings of Conference of Tokai Branch   2008   397 - 398   2008

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    DOI: 10.1299/jsmetokai.2008.57.397

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  • DNSによる乱流予混合火炎の統計解析

    坪井和也, 長谷川達哉

    燃焼シンポジウム講演論文集   46th   2008

  • 乱流予混合火炎のDNSに基づく局所量の特性に関する解析

    坪井和也, 錦慎之助, 長谷川達哉

    燃焼シンポジウム講演論文集   45th   2007

  • 5004 Local Quantities Analysis for Turbulent Premixed Flames Using DNS Database

    TSUBOI Kazuya, NISHIKI Shinnosuke, NOMURA Yoshihiro, HASEGAWA Tatsuya

    The proceedings of the JSME annual meeting   2006   351 - 352   2006

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    An analysis of flame area was performed for DNS database of turbulent premixed flames. A local flame front at a prescribed progress variable was identified as a local three-dimensional polygon. The polygon was divided into some triangles and local flame area was evaluated. The turbulent burning velocity was evaluated using the ratio of the total turbulent flame area to the planar flame area and compared with that obtained by the reaction rate.

    DOI: 10.1299/jsmemecjo.2006.3.0_351

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  • D223 An analysis for local quantities of turbulent premixed flames based on the DNS database

    Tsuboi Kazuya, Nishiki Shinnosuke, Nomura Yoshihiro, Hasegawa Tatsuya

    The Proceedings of the Thermal Engineering Conference   2006   331 - 332   2006

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    An analysis of flame area was performed for DNS database of turbulent premixed flames. A local flame front at a prescribed progress variable was identified as a local three-dimensional polygon. The polygon was divided into some triangles and local flame area was evaluated. The turbulent burning velocity was evaluated using the ratio of the total turbulent flame area to the planar flame area and compared with that obtained by the reaction rate.

    DOI: 10.1299/jsmeted.2006.331

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  • DNSデータベースを用いた乱流予混合火炎の局所層流燃焼速度等に関する解析

    坪井和也, 錦慎之助, 野村佳洋, 長谷川達哉

    燃焼シンポジウム講演論文集   44th   2006

  • 乱流予混合火炎の局所量に関するDNSデータベース解析

    坪井和也, 錦慎之助, 野村佳洋, 長谷川達哉

    数値流体力学シンポジウム講演論文集(CD-ROM)   20th   2006

  • DNS database analysis for local laminar burning velocity of turbulent premixed flames

    坪井和也, 錦慎之助, 長谷川達哉

    日本伝熱シンポジウム講演論文集(CD-ROM)   43rd   2006

  • ハイブリッド乱流モデルによる乱流予混合火炎のシミュレーション

    押領司一浩, 錦慎之助, 坪井和也, 長谷川達哉

    燃焼シンポジウム講演論文集   43rd   2005

  • 高圧下における水素-空気予混合火炎の固有不安定性

    坪井和也, 升谷五郎

    燃焼シンポジウム講演論文集   42nd   2004

  • 水素-空気予混合平面火炎の固有不安定に及ぼす圧力の影響

    坪井和也, 升谷五郎

    燃焼シンポジウム講演論文集   41st   2003

  • 二次元予混合平面火炎の固有不安定に関する直接数値シミュレーション

    坪井和也, 升谷五郎

    燃焼シンポジウム講演論文集   40th   2002

  • 二次元水素-空気予混合火炎の不安定性に関する直接数値シミュレーション

    坪井和也, 升谷五郎

    日本航空宇宙学会北部支部講演会講演論文集   2002   2002

  • Combustion of a Methanol Droplet under Microgravity in High Ambient Pressure.

    田久修, 坪井和也, 瀬川大資, 角田敏一, 竹下保弘

    日本機械学会関西支部定時総会講演会講演論文集   72nd   1997

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Presentations

  • DNSデータを用いた乱流予混合火炎面形状の熱的影響に関する検討

    坪井 和也, 松家 隆雄

    第61回燃焼シンポジウム  2023.11.17 

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    Event date: 2023.11.15 - 2023.11.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Study of Flame Shape Effect on the Interaction between Flow and Heat Adjacent to the Turbulent Premixed Flame using DNS Invited

    K. Tsuboi, T. Matsuka

    7th International Workshop on Heat-Mass Transfer Advances for Energy Conservation and Pollution Control  2023.8.7 

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    Event date: 2023.8.4 - 2023.8.8

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • DNSデータを用いた乱流予混合火炎面形状に関する検討

    坪井 和也, 松家 隆雄

    第60回燃焼シンポジウム  2022.11.21 

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    Event date: 2022.11.21 - 2022.11.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • DNSを用いた乱流予混合火炎近傍の温度場による熱的影響の検討

    坪井 和也, 松家 隆雄

    日本機械学会2022年度年次大会  2022.9.14 

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    Event date: 2022.9.11 - 2022.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • インジェクタの内部流動がキャビテーション生成に及ぼす影響に関する数値的研究

    柳 尚紀, 坪井 和也

    日本機械学会 中国四国支部第60期総会・講演会  2022.3.4 

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    Event date: 2022.3.4

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  • DNSデータに従う仮想粒子を用いた乱流予混合火炎面近傍の流れ場の調査

    松家 隆雄, 坪井 和也

    第59回燃焼シンポジウム  2021.11.22  日本燃焼学会

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    Event date: 2021.11.22 - 2021.11.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:WEB(岐阜)  

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  • Construction of DNS on the intrinsic instabilities of hydrogen/air premixed flames without the effect of computational boundary

    上原弘之, 坪井和也, 冨田栄二

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)  2021.3 

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    Event date: 2021.3

    Language:Japanese  

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  • DNSデータを用いた数値レーザトモグラフィ法による計測精度向上に向けた取り組み

    松家 隆雄, 坪井 和也, 冨田 栄二, 長谷川 達也

    第58回燃焼シンポジウム  2020.12.3  日本燃焼学会

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    Event date: 2020.12.2 - 2020.12.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:WEB(松山)  

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  • DNSデータを用いた乱流予混合火炎の数値レーザトモグラフィ法における散乱光に関する検討

    松家 隆雄, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第50回学生員卒業研究発表講演会  日本機械学会

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    Event date: 2020.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東広島  

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  • 舶用ディーゼルインジェクタの構造が内部流れに及ぼす影響に関する数値的研究

    柳 尚紀, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第50回学生員卒業研究発表講演会  日本機械学会

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    Event date: 2020.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東広島  

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  • 乱流予混合火炎のDNSデータに対する数値レーザトモグラフィ法確立への進展

    坪井 和也, 花浴 匡維, 冨田 栄二, 長谷川 達也

    第57回燃焼シンポジウム  日本燃焼学会

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    Event date: 2019.11.20 - 2019.11.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • 光学的燃焼可視化装置による燃料噴射ノズル内部の旋回流が燃焼特性に及ぼす影響の調査

    山下 裕雅, 河原 伸幸, 坪井 和也, 冨田 栄二, 藤井 幹, 森中 和宏

    第89回マリンエンジニアリング学術講演会  日本マリンエンジニアリング学会

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    Event date: 2019.10.2 - 2019.10.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:函館  

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  • Influence of Particle Diameter on Numerical PIV Measurement Using DNS Data of Turbulent Premixed Flame International conference

    Yusei Naka, Kazuya Tsuboi, Eiji Tomita, Tatsuya Hasegawa

    The 12th Asia-Pacific Conference on Combustion 

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    Event date: 2019.7.1 - 2019.7.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Fukuoka  

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  • Evaluation of Combustion Characteristics of Ultra Low Sulphur Fuel Oil by Using OCA (Optical Combustion Analyzer) and a Two Stroke Test Diesel Engine International conference

    Eiji Tomita, Yuya KUBOTA, Nobuyuki KAWAHARA, Kazuya TSUBOI, Ken MIYACHI, Morio KONDO

    The 29th CIMAC Congress 2019 

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    Event date: 2019.6.10 - 2019.6.14

    Language:English   Presentation type:Poster presentation  

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  • 水素-空気予混合火炎のDNSデータを用いた数値PLIF計測の構築に向けた検討

    上原 弘之, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第49回学生員卒業研究発表講演会  日本機械学会

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    Event date: 2019.3.6

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    Venue:山口大学  

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  • A Study of PREMIER combustion in a pilot ignited dual fuel biogas engine

    Alireza VALIPOUR, 河原 伸幸, 坪井 和也, 冨田 栄二

    第56回燃焼シンポジウム  日本燃焼学会

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    Event date: 2018.11.14 - 2018.11.16

    Language:English   Presentation type:Oral presentation (general)  

    Venue:堺市産業振興センター  

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  • DNSデータを用いた乱流予混合火炎の数値レーザトモグラフィ法の確立に向けた検討

    花浴 匡維, 坪井 和也, 冨田 栄二, 長谷川 達也

    第56回燃焼シンポジウム  日本燃焼学会

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    Event date: 2018.11.14 - 2018.11.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:堺市産業振興センター  

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  • 光学的燃焼可視化装置(OCA)による極低硫黄燃料油の着火性および燃焼性の評価

    窪田 裕也, 冨田 栄二, 河原 伸幸, 坪井 和也, 宮地 健, 近藤 守男

    第88回マリンエンジニアリング学術講演会  日本マリンエンジニアリング学会

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    Event date: 2018.10.29 - 2018.10.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター  

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  • LESによる舶用ディーゼルインジェクタ内部構造が噴孔内キャビテーションに及ぼす影響

    牧野 琢巳, 坪井 和也, 冨田 栄二, 藤井 幹, 森中 和宏

    第88回マリンエンジニアリング学術講演会  日本マリンエンジニアリング学会

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    Event date: 2018.10.29 - 2018.10.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山コンベンションセンター  

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  • DNSデータを用いた乱流予混合火炎の数値PIV計測におけるサブピクセル補間に関する検討

    中 雄誠, 坪井 和也, 冨田 栄二, 長谷川 達也

    熱工学コンファレンス2018  日本機械学会

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    Event date: 2018.10.20 - 2018.10.21

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学  

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  • 乱流予混合火炎のDNSデータを用いた数値PIV計測におけるサブピクセル補間の評価

    中 雄誠, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第48回学生員卒業研究発表講演会  2018  日本機械学会

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    Event date: 2018.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • 舶用ディーゼルエンジンにおけるインジェクタノズル内構造が内部流動および噴霧に及ぼす影響に関するCFDシミュレーション

    牧野 琢巳, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第48回学生員卒業研究発表講演会  2018  日本機械学会

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    Event date: 2018.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • 乱流予混合火炎のDNSデータを用いた数値レーザトモグラフィ法の構築

    花浴 匡維, 坪井 和也, 冨田 栄二, 長谷川 達也

    第55回燃焼シンポジウム  2017  日本燃焼学会

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    Event date: 2017.11.13 - 2017.11.15

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • 乱流予混合火炎のDNSデータを用いた数値レーザトモグラフィ法による火炎変位速度の精度評価

    花浴 匡維, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第47回学生員卒業研究発表講演会  2017  日本機械学会

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    Event date: 2017.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • ルイス数の異なるDNSデータを用いた乱流予混合火炎の数値計測

    坪井 和也, 留田 貴弘, 冨田 栄二, 長谷川 達也

    第54回燃焼シンポジウム  2016  日本燃焼学会

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    Event date: 2016.11.23 - 2016.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • 乱流予混合火炎のDNSデータを用いた火炎変位速度の実験計測における精度評価

    伊森 大記, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第46回学生員卒業研究発表講演会  2016  日本機械学会

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    Event date: 2016.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:松山  

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  • 乱流予混合火炎のDNSデータを用いた局所火炎構造に関する模擬PIVによる数値計測

    留田 貴弘, 坪井 和也, 冨田 栄二, 長谷川 達也

    第53回燃焼シンポジウム  2015  日本燃焼学会

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    Event date: 2015.11.16 - 2015.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば  

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  • DNSデータを用いた乱流燃焼場における局所流速の模擬PIV計測

    留田 貴弘, 坪井 和也, 冨田 栄二

    日本機械学会 2015年度年次大会  2015  日本機械学会

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    Event date: 2015.9.13 - 2015.9.16

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • ルイス数の異なるDNSデータを用いた火炎変位速度の実験解析手法に関する評価

    片山 達哉, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国支部 第53期総会・講演会  2015  日本機械学会

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    Event date: 2015.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東広島  

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  • 2次元DNSを用いた火炎の固有不安定性に及ぼす境界条件の影響

    徳重 和輝, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国支部 第53期総会・講演会  2015  日本機械学会

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    Event date: 2015.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東広島  

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  • 1011 Effect of boundary conditions on flame intrinsic instabilities using two-dimensional DNS

    TOKUSHIGE Kazuki, TSUBOI Kazuya, TOMITA Eiji

    2015.2.27  The Japan Society of Mechanical Engineers

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    Event date: 2015.2.27

    Language:Japanese  

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  • Effect of Hydrogen Concentration on Engine Performance and Operation Range of PREMIER Combustion in a Dual Fuel Gas Engine using Methane-Hydrogen mixtures

    52nd Symposium (Japanese) on Combustion  2014 

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    Event date: 2014.12.3 - 2014.12.5

    Language:English   Presentation type:Oral presentation (general)  

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  • 乱流予混合火炎の3次元DNSデータを用いた2次元火炎変位速度の実験解析手法に関する評価と検討

    坪井 和也, 森下 真吾, 冨田 栄二, 長谷川 達也

    第52回燃焼シンポジウム  2014 

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    Event date: 2014.12.3 - 2014.12.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Evaluating Effect of Elevated Water content on Laser-ignition Characteristics of Premixed charge of Ethanol-Air

    52nd Symposium (Japanese) on Combustion  2014 

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    Event date: 2014.12.3 - 2014.12.5

    Language:English   Presentation type:Oral presentation (general)  

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  • Effect of split micro-pilot fuel injection on engine performance, exhaust emissions, flame development and operation range of PREMIER combustion in a dual fuel engine using natural gas International conference

    Cagdas Aksu, Eiji Tomita, Nobuyuki Kawahara, Kazuya Tsuboi, Shun Nanba, Morio Kondo

    35th International Symposium on Combustion  2014 

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    Event date: 2014.8.3 - 2014.8.8

    Language:English   Presentation type:Poster presentation  

    Venue:San Francisco  

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  • DNS analysis of thermochemical effects on turbulent premixed flames nearby a wall surface International conference

    Kazuya Tsuboi, Eiji Tomita, Tatsuya Hasegawa

    35th International Symposium on Combustion  2014 

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    Event date: 2014.8.3 - 2014.8.8

    Language:English   Presentation type:Poster presentation  

    Venue:San Francisco  

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  • 乱流予混合火炎のDNSデータを用いた局所火炎曲率に関する実験解析手法の評価

    留田 貴弘, 坪井 和也, 冨田 栄二

    日本機械学会 中国四国学生会 第44回学生員卒業研究発表講演会  2014  日本機械学会

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    Event date: 2014.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 火炎変位速度の実験的解析手法に関する乱流予混合火炎の3次元DNSデータを用いた評価

    森下 真吾,坪井 和也,冨田 栄二

    第51回燃焼シンポジウム  2013 

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    Event date: 2013.12.4 - 2013.12.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • Pt表面とその近傍での熱化学的条件が水素?空気乱流予混合火炎に及ぼす影響

    坪井 和也,冨田 栄二,長谷川 達也

    第51回燃焼シンポジウム 

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    Event date: 2013.12.4 - 2013.12.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 軽油着火式二元燃料ガスエンジンにおける筒内燃焼の数値解析 -Syngas化学反応機構のバイオガス燃焼への適用-

    河副 瑠惟,河原 伸幸,冨田 栄二,*坪井 和也,脇坂 知行,近藤 守男

    第24回内燃機関シンポジウム  2013 

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    Event date: 2013.11.26 - 2013.11.28

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神戸  

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  • 固体壁面とその近傍での熱化学的条件が水素?空気乱流予混合火炎に及ぼす影響

    坪井 和也,冨田 栄二,長谷川 達也

    日本機械学会 第26回計算力学講演会 

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    Event date: 2013.11.2 - 2013.11.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:佐賀  

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  • 213 Effect of thermochemical conditions adjacent to a solid wall surface on hydrogen/air turbulent premixed flames

    TSUBOI Kazuya, TOMITA Eiji, HASEGAWA Tatsuya

    The Computational Mechanics Conference  2013.11.2  The Japan Society of Mechanical Engineers

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    Event date: 2013.11.2

    Language:Japanese  

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  • 乱流予混合火炎のDNSデータを用いた火炎変位速度の実験的解析手法に関する検討

    森下 真吾,坪井 和也,冨田 栄二

    日本機械学会2013年度年次大会  2013 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • G061055 A study on experimental analysis method of flame displacement speed using DNS database of turbulent premixed flame

    MORISHITA Shingo, TSUBOI Kazuya, TOMITA Eiji

    Mechanical Engineering Congress, Japan  2013.9.8  The Japan Society of Mechanical Engineers

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    Event date: 2013.9.8

    Language:Japanese  

    The relation of the flame displacement speeds of turbulent premixed flame obtained by both of an experimental analysis method and a numerical calculation was researched using the three-dimensional DNS database of the turbulent premixed flame. The two-dimensional flame displacement speed is experimentally evaluated by a laser sheet imaging approach. In this study, firstly, the flame displacement speeds were obtained by the numerical calculation using both the three-dimensional set and the two-dimensional component of DNS data, and were compared. It was found that negative flame displacement speed appeared only in the two-dimensional calculation. Secondly, the flame displacement speed was evaluated by the analysis method imitated experimental imaging approach, and was compared with the two-dimensional flame displacement speed obtained by the numerical calculation. As a result, it was found that the statistics of the flame displacement speed differed depending on the way to consider the local velocity in experimental analyses.

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  • 固体壁面並びにその近傍での化学的過程を考慮した水素?空気乱流予混合火炎のDNS

    坪井 和也,冨田 栄二,長谷川 達也

    第50回燃焼シンポジウム 

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    Event date: 2012.12.5 - 2012.12.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • 固体壁面並びにその近傍での熱化学的条件を考慮した水素?空気予混合火炎のDNS

    坪井 和也,冨田 栄二,長谷川 達也

    日本機械学会 熱工学コンファレンス2012 

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    Event date: 2012.11.17 - 2012.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本  

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  • C115 DNS of Hydrogen-air Premixed Flames with Thermochemical Conditions onto the Solid Surface

    Tsuboi Kazuya, Tomita Eiji, Hasegawa Tatsuya

    Procee[d]ings of Thermal Engineering Conference  2012.11.16  The Japan Society of Mechanical Engineers

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    Event date: 2012.11.16

    Language:Japanese  

    Various turbulent combustion models are currently used with RANS (Reynolds-Averaged Navier-Stokes Simulation) or LES (Large Eddy Simulation) for the analyses and developments of IC (internal combustion) engines. Their models are, however, insufficient for their analyses and developments because the models are constructed by considering only the combustion in the gas phase without considering the chemical process on the internal surface of engine cylinder. In actual IC engines, the effects of chemical process on solid surfaces on the combustion should not be negligible because the combustion takes place in a very small volume surrounded by cylinder liner, cylinder head and piston. In this study, DNS (Direct Numerical Simulation) of premixed flames with a detailed chemical kinetics of hydrogen/air including the chemical processes in the bulk and on the solid surface were implemented. It was found that heat release rate near the wall increased temporally in the case of both a turbulent flame and a planar flame. This may be due to the Lewis number effect or adiabatic wall condition.

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  • 予混合圧縮自着火機関筒内現象の数値解析

    河原 伸幸,冨田 栄二,*坪井 和也,高橋 育子,脇坂 知行,近藤 守男

    第23回内燃機関シンポジウム  2012 

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    Event date: 2012.10.31 - 2012.11.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • 固体壁面での化学的過程が水素?空気予混合火炎の振舞いに及ぼす影響

    坪井 和也,冨田 栄二,長谷川 達也

    日本機械学会2012年度年次大会 

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    Event date: 2012.9.9 - 2012.9.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • G060011 Effects of chemical processes adjacent to a solid surface on hydrogen-air premixed flames

    TSUBOI Kazuya, TOMITA Eiji, HASEGAWA Tatsuya

    Mechanical Engineering Congress, Japan  2012.9.9  The Japan Society of Mechanical Engineers

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    Event date: 2012.9.9

    Language:Japanese  

    Various turbulent combustion models are currently used with RANS (Reynolds-Averaged Navier-Stokes Simulation) or LES (Large Eddy Simulation) for the analyses and developments of IC (internal combustion) engines. Their models are, however, insufficient for their analyses and developments because the models are constructed by considering only the combustion in the gas phase without considering the chemical process on the internal surface of engine cylinder. In actual IC engines, the effects of chemical process on solid surfaces on the combustion should not be negligible because the combustion takes place in a very small volume surrounded by cylinder liner, cylinder head and piston. In this study, DNS (Direct Numerical Smilation) of premixed flames with a detailed chemical kinetics of hydrogen/air including the chemical processes in the bulk and on the solid surface were implemented. It was found that under the adiabatic wall conditions the flame adjacent to the adiabatic walls as solid surface quenches due to almost no existence of adsorbates.

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  • DNS analysis on correlation between local burning velocity and flame displacement speed of turbulent premixed flames International conference

    Kazuya Tsuboi,Tatsuya Hasegawa

    34th International Symposium on Combustion  2012 

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    Event date: 2012.7.29 - 2012.8.3

    Language:English   Presentation type:Poster presentation  

    Venue:Warsaw  

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  • DNS including the Chemical Process on a Solid Surface in Turbulent Premixed Flames International conference

    Kazuya Tsuboi,Tatsuya Hasegawa

    Eighth KSME-JSME Thermal and Fluids Engineering Conference  2012 

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    Event date: 2012.3.18 - 2012.3.21

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Incheon  

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  • 乱流予混合火炎における固体壁面での化学的過程に関するDNSによる検討

    坪井 和也, 長谷川 達也

    第49回燃焼シンポジウム  2011  日本燃焼学会

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    Event date: 2011.12.5 - 2011.12.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • バイオガスを用いた二元燃料ガスエンジン筒内燃焼の数値解析

    田中 雅高, 冨田 栄二, 河原 伸幸, 坪井 和也, 脇坂 知行

    第49回燃焼シンポジウム  2011  日本燃焼学会

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    Event date: 2011.12.5 - 2011.12.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • 水素?空気予混合平面火炎における固有不安定性の励起に関する2次元DNS

    前田 典弘, 坪井 和也, 冨田 栄二

    第49回燃焼シンポジウム  日本燃焼学会

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    Event date: 2011.12.5 - 2011.12.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • An Analysis on Local Burning Velocity and Flame Displacement Speed Using DNS Database International conference

    *Kazuya Tsuboi, Tatsuya Hasegawa

    13th International Conference on Numerical Combustion  2011 

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    Event date: 2011.4.27 - 2011.4.29

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Corfu  

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  • DNS analysis on local burning velocity and flame displacement speed of turbulent premixed flames with different density ratio International conference

    *Kazuya Tsuboi, Tatsuya Hasegawa

    ASME/JSME 2011 8th Thermal Engineering Joint Conference  2011 

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    Event date: 2011.3.13 - 2011.3.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Honolulu  

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  • 二元燃料ガスエンジン筒内燃焼現象の数値シミュレーション

    奥野 真弘, Ulugbek Azimov, *坪井 和也, 冨田 栄二

    日本機械学会 中国四国支部第49期総会・講演会  2011  日本機械学会

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 平面予混合火炎における固有不安定性の励起に関する直接数値シミュレーション

    松木 亮治, *坪井 和也, 冨田 栄二

    日本機械学会 中国四国支部第49期総会・講演会  2011  日本機械学会

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 1302 Direct numerical simulation on appearance ofintrinsic instabilities in premixed planar flames

    Matsugi Ryoji, Tomita Eiji, Tsuboi Kazuya

    2011.2.23  The Japan Society of Mechanical Engineers

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    Event date: 2011.2.23

    Language:Japanese  

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  • 1301 Numerical Analysis on Combustion in a Dual-Fuel Gas Engine Cylinder

    Okuno Masahiro, Tsuboi Kazuya, Ulugbek Azimov, Tomita Eiji

    2011.2.23  The Japan Society of Mechanical Engineers

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    Event date: 2011.2.23

    Language:Japanese  

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  • Local burning velocity and flame displacement speed of turbulent premixed flames using DNS database with different Lewis number International conference

    *Kazuya Tsuboi, Tatsuya Hasegawa

    8th Asia-Pacific Conference on Combustion  2010 

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    Event date: 2010.12.10 - 2010.12.13

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hyderabad  

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  • 乱流予混合火炎における局所燃焼速度と火炎変位速度の関係

    坪井 和也, 長谷川 達也

    第48回燃焼シンポジウム  2010  日本燃焼学会

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    Event date: 2010.12.1 - 2010.12.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福岡  

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  • 乱流予混合火炎における局所燃焼速度と火炎変位速度に関するDNS解析

    坪井 和也, 長谷川 達也

    日本機械学会 熱工学コンファレンス2010  2010  日本機械学会

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    Event date: 2010.10.30 - 2010.10.31

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:長岡  

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  • 乱流予混合火炎のDNS解析における局所燃焼速度と火炎変位速度

    *坪井 和也, 長谷川 達也

    第47回燃焼シンポジウム  2009  日本燃焼学会

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    Event date: 2009.12.2 - 2009.12.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • 乱流予混合火炎のDNS(直接数値シミュレーション)及びDNSデータを用いた統計解析

    *坪井 和也

    自動車技術会第11回ガソリン機関部門委員会  2009  自動車技術会

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    Event date: 2009.11.13

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:豊田  

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  • 局所燃焼速度と火炎伸長率との相関に関するDNS解析

    *坪井 和也, 長谷川 達也

    日本流体力学会年会2009  2009  日本流体力学会

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    Event date: 2009.9.2 - 2009.9.4

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • DNS Analysis on Correlation between Local Burning Velocity and Local Stretch Rate for Turbulent Premixed Flames with Different Lewis Numbers International conference

    *Kazuya Tsuboi, Tatsuya Hasegawa

    7th Asia-Pacific Conference on Combustion  2009 

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    Event date: 2009.5.24 - 2009.5.27

    Language:English   Presentation type:Oral presentation (general)  

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  • DNSによる乱流予混合火炎の統計解析

    *坪井 和也, 長谷川 達哉

    第46回燃焼シンポジウム  2008  日本燃焼学会

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    Event date: 2008.12.3 - 2008.12.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:京都  

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  • Statistical Analysis on Turbulent Premixed Flames Using DNS International conference

    *Kazuya Tsuboi, Tatsuya Hasegawa

    DNS and LES of Reacting Flows  2008 

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    Event date: 2008.10.22 - 2008.10.24

    Language:English   Presentation type:Oral presentation (general)  

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  • Statistical Analysis of Turbulent Premixed Flames Using DNS International conference

    *Kazuya Tsuboi, Tatsuya Hasegawa

    7th JSME-KSME Thermal and Fluids Engineering Conference  2008 

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    Event date: 2008.10.13 - 2008.10.16

    Language:English   Presentation type:Oral presentation (general)  

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  • DNS データベースを用いた乱流予混合火炎の統計解析

    *坪井 和也, 長谷川 達哉

    日本流体力学会年会2008  2008  日本流体力学会

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    Event date: 2008.9.4 - 2008.9.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神戸  

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  • A statistical study on turbulent premixed flames using DNS International conference

    *Kazuya Tsuboi

    11th International Workshop on Premixed Turbulent Flames  2008 

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    Event date: 2008.8.9 - 2008.8.10

    Language:English   Presentation type:Oral presentation (general)  

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  • An Analysis on local burning velocities of turbulent premixed flames using DNS databases International conference

    *Kazuya Tsuboi, Tatsuya Hasegawa

    32nd International Symposium on Combustion  2008 

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    Event date: 2008.8.3 - 2008.8.8

    Language:English   Presentation type:Poster presentation  

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  • An analysis on turbulent premixed flames with different Lewis numbers using DNS databases International conference

    *K. Tsuboi

    Workshop on Modeling of Turbulent Combustion  2008 

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    Event date: 2008.6.4

    Language:English   Presentation type:Oral presentation (general)  

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  • DNSに基づく乱流予混合火炎の局所量解析

    *坪井 和也, 錦 慎之助, 長谷川 達哉

    日本機械学会東海支部第57期総会・講演会  2008  日本機械学会

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    Event date: 2008.3.10 - 2008.3.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • DNSを用いた乱流予混合火炎の局所燃焼速度に関する解析

    *坪井 和也, 長谷川 達哉

    第23回生研TSFDシンポジウム  2008  東京大学生産技術研究所TSFD研究グループ

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    Event date: 2008.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 乱流予混合火炎のDNSに基づく局所量の特性に関する解析

    *坪井 和也, 錦 慎之助, 長谷川 達哉

    第45回燃焼シンポジウム  2007  日本燃焼学会

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    Event date: 2007.12.5 - 2007.12.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • Local structure of turbulent premixed flames obtained by DNS International conference

    *Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    International Symposium on EcoTopia Science 2007  2007 

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    Event date: 2007.11.23 - 2007.11.25

    Language:English   Presentation type:Oral presentation (general)  

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  • DNSによる乱流予混合火炎の局所量解析

    *坪井 和也, 錦 慎之助, 長谷川 達哉

    第5回日本流体力学会中部支部講演会  2007  日本流体力学会

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    Event date: 2007.11.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • Small scale reactive scalar dynamics in turbulent premixed flames Part I: mean reactive scalar dissipation International conference

    Arnaud Mura, Vincent Robin, Michel Champion, *Kazuya Tsuboi, Tatsuya Hasegawa

    21st International Colloquium on the Dynamics of Explosions and Reactive Systems  2007 

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    Event date: 2007.7.23 - 2007.7.27

    Language:English   Presentation type:Poster presentation  

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  • Local Quantities Analysis of Turbulent Premixed Flames Using DNS Databases International conference

    *Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    21st International Colloquium on the Dynamics of Explosions and Reactive Systems  2007 

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    Event date: 2007.7.23 - 2007.7.27

    Language:English   Presentation type:Poster presentation  

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  • An Analysis of Local Quantities of Turbulent Premixed Flames Using DNS Databases International conference

    *Kazuya Tsuboi, Shinnosuke Nishiki and Tatsuya Hasegawa

    7th ASME-JSME Thermal Engineering and Summer Heat Transfer Conference  2007 

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    Event date: 2007.7.8 - 2007.7.12

    Language:English   Presentation type:Oral presentation (general)  

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  • Analysis of Local Quantities of Turbulent Premixed Flames Using DNS Databases International conference

    *Kazuya Tsuboi, Shinnosuke Nishiki and Tatsuya Hasegawa

    6th Asia-Pacific Conference on Combustion  2007 

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    Event date: 2007.5.20 - 2007.5.23

    Language:English   Presentation type:Oral presentation (general)  

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  • DNSデータベースを用いた乱流予混合火炎の解析

    *坪井 和也, 錦 慎之助, 長谷川 達哉

    第22回生研TSFDシンポジウム  2007  東京大学生産技術研究所TSFD研究グループ

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    Event date: 2007.3.1

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 乱流予混合火炎の局所量に関するDNSデータベース解析

    *坪井 和也, 錦 慎之助, 野村 佳洋, 長谷川 達哉

    第4回日本流体力学会中部支部講演会  2006  日本流体力学会

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    Event date: 2006.12.18 - 2006.12.20

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • DNSデータベースを用いた乱流予混合火炎の局所層流燃焼速度等に関する解析

    *坪井 和也, 錦 慎之助, 野村 佳洋, 長谷川 達哉

    第44回燃焼シンポジウム  2006  日本燃焼学会

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    Event date: 2006.12.6 - 2006.12.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • DNSデータベースに基づく乱流予混合火炎の局所量に関する解析

    *坪井 和也, 錦 慎之助, 野村 佳洋, 長谷川 達哉

    日本機械学会熱工学コンファレンス2006  2006  日本機械学会

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    Event date: 2006.11.24 - 2006.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • 乱流予混合火炎の局所量に関するDNSデータベース解析

    *坪井 和也, 錦 慎之助, 野村 佳洋, 長谷川 達哉

    第20回数値流体力学シンポジウム  2006  日本流体力学会

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    Event date: 2006.11.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • DNSデータベースを用いた乱流予混合火炎の局所量解析

    *坪井 和也, 錦 慎之助, 野村 佳洋, 長谷川 達哉

    日本機械学会2006年度年次大会  2006  日本機械学会

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    Event date: 2006.9.18 - 2006.9.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本  

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  • 乱流予混合火炎の局所層流燃焼速度に関するDNSデータベース解析

    *坪井 和也, 錦 慎之助, 長谷川 達哉

    第43回日本伝熱シンポジウム  2006  日本伝熱学会

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    Event date: 2006.5.31 - 2006.6.2

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • ハイブリッド乱流モデルによる乱流予混合火炎のシミュレーション

    押領司 一浩, 錦 慎之助, *坪井 和也, 長谷川 達哉

    第43回燃焼シンポジウム  2005  日本燃焼学会

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    Event date: 2005.12.5 - 2005.12.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 圧力変化に対する水素?空気層流予混合火炎の固有不安定に関するDNS

    *坪井 和也, 升谷 五郎, 長谷川 達也

    第3回日本流体力学会中部支部講演会  日本流体力学会

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    Event date: 2005.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岐阜  

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  • 高圧下における水素?空気予混合火炎の固有不安定性

    *坪井 和也, 升谷 五郎

    第42回燃焼シンポジウム  日本燃焼学会

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    Event date: 2004.12.1 - 2004.12.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:岐阜  

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  • Intrinsic Instabilities of Hydrogen/air Premixed Planar Flames under High Pressure International conference

    *Kazuya Tsuboi and Goro Masuya

    5th Japan-Korea Seminar on Combustion and Heat Transfer & CERC Workshop  2004 

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    Event date: 2004.11.11 - 2004.11.12

    Language:English   Presentation type:Poster presentation  

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  • 水素?空気予混合平面火炎の固有不安定に及ぼす圧力の影響

    *坪井 和也, 升谷 五郎

    第41回燃焼シンポジウム  日本燃焼学会

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    Event date: 2003.12.3 - 2003.12.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:つくば  

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  • Direct numerical simulations for intrinsic instabilities of premixed planar flames

    *Kazuya Tsuboi and Goro Masuya

    The 4th Asia-Pacific Conference on Combustion  2003 

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    Event date: 2003.11.23 - 2003.11.26

    Language:English   Presentation type:Oral presentation (general)  

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  • DNS for the Effects of Pressure on the Intrinsic Instability of Premixed Planar Flames International conference

    *Kazuya Tsuboi and Goro Masuya

    4th Korea-Japan Seminar on Combustion and Heat Transfer & CERC Workshop  2003 

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    Event date: 2003.9.28 - 2003.9.29

    Language:English  

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  • 二次元予混合平面火炎の固有不安定に関する直接数値シミュレーション

    *坪井 和也, 升谷 五郎

    第40回燃焼シンポジウム  2002  日本燃焼学会

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    Event date: 2002.12.4 - 2002.12.6

    Language:Japanese   Presentation type:Poster presentation  

    Venue:大阪  

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  • DNS for Instabilities of Premixed Planar Flames International conference

    *Kazuya Tsuboi and Goro Masuya

    3rd Japan-Korea Seminar on Combustion and Heat Transfer  2002 

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    Event date: 2002.8.25 - 2002.8.27

    Language:English  

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  • DNS for instabilities of premixed planar flames International conference

    *Tsuboi, K. and Masuya, G.

    29th Symposium (International) on Combustion (Work-in-Progress Session)  2002 

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    Event date: 2002.7.21 - 2002.7.26

    Language:English   Presentation type:Poster presentation  

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  • 二次元水素?空気予混合火炎の不安定性に関する直接数値シミュレーション

    *坪井 和也, 升谷 五郎

    日本航空宇宙学会北部支部2002年講演会ならびに第3回再使用型宇宙推進系シンポジウム  日本航空宇宙学会

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    Event date: 2002.3.12 - 2002.3.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:仙台  

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  • 微小重力場高圧雰囲気中におけるメタノール液滴の燃焼

    田久 修, *坪井 和也, 瀬川 大資, 角田 敏一, 竹下 保弘

    日本機械学会関西支部第72期定時総会講演会  1997  日本機械学会

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    Event date: 1997.3.21 - 1997.3.22

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪  

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  • Pt表面とその近傍での熱化学的条件が水素-空気乱流予混合火炎に及ぼす影響

    第51回燃焼シンポジウム  2013 

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  • 固体壁面とその近傍での熱化学的条件が水素-空気乱流予混合火炎に及ぼす影響

    日本機械学会 第26回計算力学講演会  2013 

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  • 固体壁面並びにその近傍での熱化学的条件を考慮した水素-空気予混合火炎のDNS

    日本機械学会 熱工学コンファレンス2012  2012 

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  • 固体壁面での化学的過程が水素-空気予混合火炎の振舞いに及ぼす影響

    日本機械学会2012年度年次大会  2012 

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  • 固体壁面並びにその近傍での化学的過程を考慮した水素-空気乱流予混合火炎のDNS

    第50回燃焼シンポジウム  2012 

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  • 水素-空気予混合平面火炎における固有不安定性の励起に関する2次元DNS

    第49回燃焼シンポジウム  2011 

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  • 圧力変化に対する水素-空気層流予混合火炎の固有不安定に関するDNS

    第3回日本流体力学会中部支部講演会  2005 

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  • 高圧下における水素-空気予混合火炎の固有不安定性

    第42回燃焼シンポジウム  2004 

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  • 水素-空気予混合平面火炎の固有不安定に及ぼす圧力の影響

    第41回燃焼シンポジウム  2003 

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  • 二次元水素-空気予混合火炎の不安定性に関する直接数値シミュレーション

    日本航空宇宙学会北部支部2002年講演会ならびに第3回再使用型宇宙推進系シンポジウム  2002 

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Research Projects

  • DNS on turbulent flames with differnt thermochemical conditions and configuration of combustion chamber for development of turbulent combustion model in next generation

    Grant number:24560235  2012.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    TSUBOI Kazuya

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\5460000 ( Direct expense: \4200000 、 Indirect expense:\1260000 )

    To develop the new turbulent combustion model which can compute turbulent combustion in the combustors for transportation and power generation more precisely and which is available for the development and design of the combustors instead of the traditional turbulent combustion model, direct numerical simulations (DNS) of turbulent combustion were implemented with considering the chemical and thermal conditions near the wall of combustors as possible, which has never been considered. As a result, when the chemical and thermal conditions near the wall are considered, we reveal the temporal behaviours of turbulent flames near the wall, the effects of the thermal conditions on the wall on tubulent flames, and the details of adsorbate on the wall.

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  • Construction of DNS database for development of next-generation turbulent combustion model

    Grant number:22760152  2010.04 - 2012.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    TSUBOI Kazuya

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

    In this study, to develop the turbulent combustion model which can compute combustion in a combustor more precisely and which is available for the development and design of a combustor, direct numerical simulations(DNS) of turbulent combustion were implemented with considering the behaviours of chemical species on the wall and between the gas and wall in a combustor, which has never been considered. As a result, it is found that when the behaviours of chemical species on and near the wall are considered, the flame quenches on the wall and the heat release rate does not increase nearby, and the DNS data of combustion computation with more realistic conditions for the inside of a combustor was obtained.

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