Updated on 2021/07/12

写真a

 
TSUBOI Kazuya
 
Organization
Natural Science and Technology Assistant Professor
Position
Assistant Professor
External link

Degree

  • 学士(工学) ( 大阪府立大学 )

  • M.Engr. ( Tohoku University )

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

Research Interests

  • 燃焼工学

  • Combustion Engineering

Research Areas

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

Education

  • Tohoku University    

    - 2005

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

    - 2005

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    Country: Japan

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  • Osaka Prefecture University    

    - 1997

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  • Osaka Prefecture University   School of Engineering   Department of Mechanical Engineering

    - 1997

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    Country: Japan

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Research History

  • - Assistant Professor,Industrial Innovation Sciences,Graduate School of Natural Science and Technology,Okayama University

    2008

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  • - 岡山大学自然科学研究科産業創成工学専攻 助教

    2008

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  • フランス国立科学研究センター 燃焼爆轟研究所 招聘研究員

    2007

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  • Invited researcher,Laboratoire de Combustion et de Detonique, CNRS, France

    2007

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  • フランス国立科学研究センター 燃焼爆轟研究所 招聘研究員

    2006

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  • Invited researcher,Laboratoire de Combustion et de Detonique, CNRS, France

    2006

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  • Part-time researcher for university or other academic organization,Nagoya University

    2005 - 2008

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  • Nagoya University   Ecotopia Science Institute

    2005 - 2008

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Professional Memberships

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MISC

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

    Kazuya Tsuboi, Takahiro Tomeda, Eiji Tomita, Tatsuya Hasegawa

    The Ninth JSME-KSME Thermal and Fluids Engineering Conference   TFEC9-1540   2017

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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

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

    FUEL   185   243 - 253   2016.12

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    Language:English   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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  • 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

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

    FUEL   185   243 - 253   2016.12

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    Language:English   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

    Yungjin Kim, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    APPLIED ENERGY   182   539 - 547   2016.11

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    Language:English   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 and NOx emissions of biogas fuels with various CO2 contents in a micro co-generation spark-ignition engine

    Yungjin Kim, Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    APPLIED ENERGY   182   539 - 547   2016.11

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    Language:English   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

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

    FUEL   165   331 - 340   2016.2

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

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

    FUEL   165   331 - 340   2016.2

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

    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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    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    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

    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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  • Evaluation of Experimental Measurement and Analysis on the Flame Displacement Speed Using DNS Data of Turbulent Premixed Flames

    Kazuya Tsuboi, Shingo Morishita, Eiji Tomita, Tatsuya Hasegawa

    Proceedings of the 10th Asia-Pacific Conference on Combustion   223   2015

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  • Experimental Study on Combustion Characteristics of Wet Ethanol Ignited by Laser-Induced Breakdown

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

    The 3rd Laser Ignition Conference   W3A.2   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

    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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    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

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

    Nobuyuki Kawahara, Kazuya Tsuboi, Eiji Tomita

    OPTICS EXPRESS   22 ( 1 )   A44 - A52   2014.1

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    Language:English   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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  • The use of direct numerical simulations (DNS) on combustion - evaluation of experimental analysis methods -

    Kazuya Tsuboi

    Journal of the Japan Society of Mechanical Engineers   117 ( 1148 )   479   2014

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  • Laser Ignition Characteristics of Hydrous Ethanol

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

    The 2nd Laser Ignition Conference   LIC3-5   2014

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  • 燃焼の直接数値シミュレーション(DNS)の使い道 -実験解析手法の評価-

    坪井 和也

    日本機械学会誌   117 ( 1148 )   479   2014

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

    Kazuya Tsuboi, Eiji Tomita

    Open Journal of Fluid Dynamics   4 ( 3 )   288 - 297   2014

  • 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

    Kazuya Tsuboi, Shingo Morishita, Eiji Tomita

    Open Journal of Fluid Dynamics   4 ( 3 )   278 - 287   2014

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

    Kazuya Tsuboi, Ryoji Matsugi, Eiji Tomita

    Natural Science   6 ( 12 )   1030 - 1036   2014

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

    Kazuya Tsuboi, Eiji Tomita, Tatsuya Hasegawa

    24th International Colloquium on the Dynamics of Explosions and Reactive Systems   2013

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

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of the Eighth KSME-JSME Thermal and Fluids Engineering Conference   GST04-012   2012

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

    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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    Language:English   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    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

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of the ASME/JSME 2011 8th Thermal Engineering Joint Conference   AJTEC2011-44294   2011

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

    Ulugbek Azimov, Nobuyuki Kawahara, Eiji Tomita, Kazuya Tsuboi

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   5 ( 2 )   238 - 251   2010

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

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of the 8th Asia-Pacific Conference on Combustion   75 - 78   2010

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

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of the 7th Asia-Pacific Conference on Combustion   208   2009

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  • Statistical Analysis of Turbulent Premixed Flames Using DNS

    Kazuya Tsuboi, Tatsuya Hasegawa

    Proceedings of The Seventh JSME-KSME Thermal and Fluids Engineering Conference (TFEC7)   C143   2008

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  • Statistical Analysis on Turbulent Premixed Flames Using DNS

    Kazuya Tsuboi, Tatsuya Hasegawa

    DNS and LES of Reacting Flows   27 - 28   2008

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

    Kazuya Tsuboi, Tatsuya Hasegawa

    32nd International Symposium on Combustion   90 - 90   2008

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

    Arnaud Mura, Kazuya Tsuboi, Tatsuya Hasegawa

    COMBUSTION THEORY AND MODELLING   12 ( 4 )   671 - 698   2008

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    Language:English   Publisher:TAYLOR & FRANCIS LTD  

    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

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   3 ( 1 )   103 - 111   2008

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    Language:English   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    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

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

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

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  • Local Quantities Analysis of Turbulent Premixed Flames Using DNS Databases

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    Proceedings of the 21st International Colloquium on the Dynamics of Explosions and Reactive Systems   88   2007

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

    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

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

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    Proceedings of the 7th ASME-JSME Thermal Engineering and Summer Heat Transfer Conference   HT2007-32794   2007

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

    Kazuya Tsuboi, Shinnosuke Nishiki, Tatsuya Hasegawa

    Proceedings of the 6th Asia-Pacific Conference on Combustion   348 - 351   2007

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  • Direct numerical simulations for intrinsic instabilities of premixed planar flames

    Kazuya Tsuboi, Goro Masuya

    Proceedings of the 4th Asia-Pacific Conference on Combustion   136 - 139   2003

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  • 二次元水素-空気予混合火炎の固有不安定におよぼす微小擾乱の影響に関する直接数値シミュレーション

    坪井 和也, 升谷 五郎

    日本燃焼学会誌   45 ( 133 )   184 - 190   2003

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

    TSUBOI, Kazuya, MASUYA, Goro

    45 ( 133 )   184 - 190   2003

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Presentations

  • 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

    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 

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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

    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 

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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

    第55回燃焼シンポジウム  2017 

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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

    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 

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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

    第54回燃焼シンポジウム  2016 

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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

    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 

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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

    第53回燃焼シンポジウム  2015 

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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

    日本機械学会 2015年度年次大会  2015 

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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

    日本機械学会 中国四国支部 第53期総会・講演会  2015 

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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

    日本機械学会 中国四国支部 第53期総会・講演会  2015 

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

    35th International Symposium on Combustion  2014 

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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

    35th International Symposium on Combustion  2014 

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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

    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 

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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

    第52回燃焼シンポジウム  2014 

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

    第52回燃焼シンポジウム  2014 

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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

    第52回燃焼シンポジウム  2014 

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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

    第51回燃焼シンポジウム  2013 

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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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  • 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-

    第24回内燃機関シンポジウム  2013 

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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

    日本機械学会2013年度年次大会  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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  • 予混合圧縮自着火機関筒内現象の数値解析

    第23回内燃機関シンポジウム  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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  • DNS analysis on correlation between local burning velocity and flame displacement speed of turbulent premixed flames

    34th International Symposium on Combustion  2012 

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

    Eighth KSME-JSME Thermal and Fluids Engineering Conference  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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  • 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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  • 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

    日本機械学会 中国四国支部第49期総会・講演会  2011 

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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

    第49回燃焼シンポジウム  2011 

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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

    第49回燃焼シンポジウム  2011 

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

    13th International Conference on Numerical Combustion  2011 

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

    ASME/JSME 2011 8th Thermal Engineering Joint Conference  2011 

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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

    日本機械学会 中国四国支部第49期総会・講演会  2011 

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

    8th Asia-Pacific Conference on Combustion  2010 

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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

    第48回燃焼シンポジウム  2010 

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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

    日本機械学会 熱工学コンファレンス2010  2010 

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

    7th Asia-Pacific Conference on Combustion  2009 

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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

    第47回燃焼シンポジウム  2009 

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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

    自動車技術会第11回ガソリン機関部門委員会  2009 

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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

    日本流体力学会年会2009  2009 

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

    7th Asia-Pacific Conference on Combustion  2009 

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

    Workshop on Modeling of Turbulent Combustion  2008 

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  • A statistical study on turbulent premixed flames using DNS

    11th International Workshop on Premixed Turbulent Flames  2008 

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

    32nd International Symposium on Combustion  2008 

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

    Workshop on Modeling of Turbulent Combustion  2008 

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  • DNSによる乱流予混合火炎の統計解析

    第46回燃焼シンポジウム  2008 

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  • Statistical Analysis on Turbulent Premixed Flames Using DNS

    DNS and LES of Reacting Flows  2008 

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  • Statistical Analysis of Turbulent Premixed Flames Using DNS

    7th JSME-KSME Thermal and Fluids Engineering Conference  2008 

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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

    日本流体力学会年会2008  2008 

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  • DNSに基づく乱流予混合火炎の局所量解析

    日本機械学会東海支部第57期総会・講演会  2008 

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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

    第23回生研TSFDシンポジウム  2008 

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  • Statistical Analysis on Turbulent Premixed Flames Using DNS

    DNS and LES of Reacting Flows  2008 

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  • Statistical Analysis of Turbulent Premixed Flames Using DNS

    7th JSME-KSME Thermal and Fluids Engineering Conference  2008 

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  • A statistical study on turbulent premixed flames using DNS

    11th International Workshop on Premixed Turbulent Flames  2008 

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

    32nd International Symposium on Combustion  2008 

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  • Local Quantities Analysis of Turbulent Premixed Flames Using DNS Databases

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

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

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

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

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

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  • Local Quantities Analysis of Turbulent Premixed Flames Using DNS Databases

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

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  • Local structure of turbulent premixed flames obtained by DNS

    International Symposium on EcoTopia Science 2007  2007 

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  • Local structure of turbulent premixed flames obtained by DNS

    International Symposium on EcoTopia Science 2007  2007 

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  • DNSによる乱流予混合火炎の局所量解析

    第5回日本流体力学会中部支部講演会  2007 

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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

    第45回燃焼シンポジウム  2007 

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

    6th Asia-Pacific Conference on Combustion  2007 

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

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

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

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

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

    6th Asia-Pacific Conference on Combustion  2007 

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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

    第22回生研TSFDシンポジウム  2007 

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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

    日本機械学会熱工学コンファレンス2006  2006 

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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

    第4回日本流体力学会中部支部講演会  2006 

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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

    日本機械学会2006年度年次大会  2006 

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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

    第43回日本伝熱シンポジウム  2006 

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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

    第20回数値流体力学シンポジウム  2006 

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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

    第44回燃焼シンポジウム  2006 

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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

    第43回燃焼シンポジウム  2005 

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

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

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

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

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

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

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  • Direct numerical simulations for intrinsic instabilities of premixed planar flames

    The 4th Asia-Pacific Conference on Combustion  2003 

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

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

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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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  • Direct numerical simulations for intrinsic instabilities of premixed planar flames

    The 4th Asia-Pacific Conference on Combustion  2003 

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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

    第40回燃焼シンポジウム  2002 

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  • DNS for Instabilities of Premixed Planar Flames

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

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  • DNS for instabilities of premixed planar flames

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

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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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  • DNS for Instabilities of Premixed Planar Flames

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

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  • DNS for instabilities of premixed planar flames

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

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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

    日本機械学会関西支部第72期定時総会講演会  1997 

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  • Experiments in Mechanical Engineering (2021academic year) 1st-4th semester  - [第1学期]火5,火6,火7,火8, [第2学期]その他, [第3学期]火5,火6,火7,火8, [第4学期]火5,火6,火7,火8

  • Experiments in Mechanical Engineering (2021academic year) 1st-4th semester  - [第1学期]火5,火6,火7,火8, [第2学期]その他, [第3学期]火5,火6,火7,火8, [第4学期]火5,火6,火7,火8

  • Experiments in Mechanical EngineeringⅡ (2021academic year) 3rd and 4th semester  - 火5,火6,火7,火8

  • Experiments in Mechanical EngineeringI (2021academic year) 1st semester  - 火5,火6,火7,火8

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  • Experiments in Mechanical Engineering (2020academic year) 1st-4th semester  - 火5,火6,火7,火8

  • Experiments in Mechanical Engineering (2020academic year) 1st-4th semester  - 火5,火6,火7,火8

  • Experiments in Mechanical EngineeringⅡ (2020academic year) 3rd and 4th semester  - 火5,火6,火7,火8

  • Experiments in Mechanical EngineeringI (2020academic year) 1st semester  - 火5,火6,火7,火8

  • Research Works for Mechanical and Systems Engineering 1 (2020academic year) Prophase  - その他

  • Research Works for Mechanical and Systems Engineering 2 (2020academic year) Late  - その他

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