研究者詳細 - 小橋　好充

論文 - 小橋　好充

分割表示 135 件中 1 - 20 件目／全件表示 >>

Effect of swirl flow on the main chamber combustion dynamics of methane in a passive pre-chamber spark ignition engine 査読

MD. Tanvir Khan, Nobuyuki Kawahara, Yoshimitsu Kobashi, Isao Yamane, Towa Hirayama, Ayumi Shimizu, Sekai Miyamoto

Fuel 391 134735 - 134735 2025年7月

Improvement of Lean Burn Characteristics with Ozone Addition in a Diesel Micro-pilot Natural Gas Engine 査読

Yoshimitsu Kobashi, Shoki Miyata, Nobuyuki Kawahara, Ryuya Inagaki

SAE Technical Paper No.2024-32-0104 2024年11月

Effects of Hydrogen Addition on Spark Knock Suppression Under High Engine Speed and Boosted Conditions 査読

Jun Goto, Yoshito Ueno, Yoshimitsu Kobashi, Gen Shibata, Hideyuki Ogawa, Kentaro Kjima

SAE Technical Paper No.2024-32-0108 2024年11月

Influence of spray-to-spray interaction after wall impingement of spray flames on diesel combustion characteristics 査読

Hideyuki Ogawa, Tomoki Ishikawa, Yoshimitsu Kobashi, Gen Shibata

International Journal of Engine Research 2024年7月

Simultaneous improvements of thermal efficiencies and smoke emissions in semi-premixed diesel combustion with dual-injectors and a spatially divided combustion chamber 査読

Kazuki Inaba, Yoshimitsu Kobashi, Gen Shibata, Kazuhiro Hayashida, Hideyuki Ogawa

International Journal of Engine Research 2024年6月

Hydrogen concentration measurements using spark induced breakdown spectroscopy in a real engine 査読

Dongchan Kim, Quancen Wan, Qing Nian Chan, Yoshimitsu Kobashi, Nobuyuki Kawahara, Sanghoon Kook

Proceedings of the Combustion Institute 40 ( 1-4 ) 105209 - 105209 2024年6月

Mechanism of the reduction in afterburning and thermal efficiency improvement with highly oxygenated fuels in diesel combustion 査読

Takao Kawabe, Takao Kawabe, Takao Kawabe, Takao Kawabe, Yoshimitsu Kobashi, Gen Shibata, Hideyuki Ogawa

International Journal of Engine Research 24 ( 10 ) 4362 - 4372 2023年9月

Improvement of diesel combustion with suppression of mutual fuel spray flame interactions with staggered nozzle hole arrangement and a spatially divided combustion chamber 査読

Hideyuki Ogawa, Kazuma Mori, Tomoki Ishikawa, Yoshimitsu Kobashi, Gen Shibata

International Journal of Engine Research 24 ( 9 ) 4276 - 4286 2023年8月

Thermal Efficiency Improvement in Twin Shaped Semi-Premixed Diesel Combustion with a Combusiton Chamber Dividing Fuel Sprays and Optimization of Fuel Ignitability 査読

Kazuki Inaba, Yoshimitsu Kobashi, Gen Shibata, Hideyuki Ogawa

SAE Technical Paper No.2023-32-0051 1 - 9 2023年8月

PREMIER Combustion of Natural Gas Ignited with Diesel Fuel in a Dual Fuel Engine - Effects of EGR and Supercharging on End-gas Auto Ignition and Thermal Efficiency 査読

Yoshimitsu Kobashi, Kengo Kishimoto, Nobuyuki Kawahara

SAE Technical Paper No.2023-32-0016 1 - 11 2023年8月

Visualization of Combustion and Flow Phenomena in a Methane-Fueled Passive Pre-Chamber Ignited Gas Engine 査読

MD Tanvir Khan, Nobuyuki Kawanara, Yoshimitsu Kobashi, Towa Hirayama, Ayumi Shimizu, Sekai Miyamoto

SAE Technical Paper No.2023-32-0057 1 - 8 2023年8月

千鳥噴孔配置燃料噴射ノズルによる噴霧間干渉の抑制とディーゼル燃焼の改善査読

小川英之, 森一磨, 石川友貴, 小橋好充, 柴田元

自動車技術会論文集 54 ( 3 ) 574 - 579 2023年5月

Improvements in thermal efficiency and exhaust emissions with ozone addition in a natural gas-diesel dual fuel engine 査読

Yoshimitsu Kobashi, Ryuya Inagaki, Gen Shibata, Hideyuki Ogawa

International Journal of Engine Research 1 - 12 2023年3月

Chemical Kinetic Analysis with Two-Zone Model on Spark Knock Suppression Effects with Hydrogen Addition at Low and High Engine Speeds 査読

Jun Goto, Yoshimitsu Kobashi, Yoshito Ueno, Gen Shibata, Hideyuki Ogawa, Minoru Yamamoto

SAE Technical Paper No.2022-32-0089 2022年11月

Improvements of Combustion and Emissions in a Natural Gas Fueled Engine with Hydrogen Enrichment and Optimized Injection Timings of the Diesel Fuel 査読

Yoshimitsu Kobashi, Ryuya Inagaki, Gen Shibata, Hideyuki Ogawa

SAE Technical Paper No.2022-32-0095 Also in:SAE International Journal of Advances and Current Practices in Mobility-V132-99EJ 2022年11月

Steady-state kinetic modeling of NH3-SCR by monolithic Cu-CHA catalysts 査読

Gen Shibata, Naoki Shibayama, Keita Araki, Yoshimitsu Kobashi, Hideyuki Ogawa, Yuta Nakasaka, Ken-ichi Shimizu

Catalysis Today 2022年6月

Effects of Chemical Compositions and Cetane Number of Fischer–Tropsch Fuels on Diesel Engine Performance 査読

Haoyu Yuan, Takuma Tsukuda, Yurui Yang, Gen Shibata, Yoshimitsu Kobashi, Hideyuki Ogawa

Energies 15 ( 11 ) 4047 - 4047 2022年5月

Spark knock suppression in spark ignition engines with hydrogen addition under low and high engine speeds 査読

Jun Goto, Yoshimitsu Kobashi, Yusuke Matsumura, Gen Shibata, Hideyuki Ogawa, Naoyoshi Kuragaki

International Journal of Hydrogen Energy 2022年4月

Oxidation phenomena of diesel post fuel in the expansion stroke 査読

Gen Shibata, Yuanzhe Li, Kensei Karumai, Yoshimitsu Kobashi, Hideyuki Ogawa

International Journal of Engine Research 24 ( 3 ) 1095 - 1109 2022年1月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：SAGE Publications

Post fuel is injected to avoid plugging of diesel particulate filters (DPF). However, at advanced post fuel injection timings, the post fuel is partially oxidized in the cylinder under the high temperature conditions and the hydrocarbon supplied to DOC is not sufficient to regenerate the DPF. In this paper, partial oxidation phenomena at advanced post fuel injection timings were investigated with an engine and a high pressure-temperature optical constant volume chamber. In the engine experiments, the oxidation ratio of the post fuel was calculated from the exhaust gas composition. When the post fuel is injected at 30 CA ATDC, 83% of the post fuel is oxidized, however when the injection timing is 60 CA ATDC, the oxidation ratio of the post fuel becomes 2.2% and there is a 40.9% fuel loss mostly due to oil dilution. The reaction speed, in-cylinder temperature, and oxygen concentration (mol/m³) at the post fuel injection timing are related to the partial oxidation ratio of the post fuel. In the experiments with the constant volume chamber, the spray behaviors at the post fuel injections were observed. The ignition delay becomes longer with lower in-cylinder temperature and lower oxygen concentration, and the spray dilution of the post fuel during the ignition delays affects the heat release and the location where the partial oxidation in the chamber occurs. Based on the experimental data of engine speed, oxygen concentration, and in-cylinder temperature at the start of post fuel injection, an experimental formula for the post fuel oxidation ratio based on the Arrhenius equation was suggested by multiple regression analysis of the engine test data.

DOI： 10.1177/14680874221075104

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その他リンク： http://journals.sagepub.com/doi/full-xml/10.1177/14680874221075104

Fuel Reformation by Piston Compression of Rich Air-fuel Mixture 査読

Gen Shibata, Go Asai, Shuntaro Ishiguro, Yusuke Watanabe, Yoshimitsu Kobashi, Hideyuki Ogawa

International Journal of Engine Research first published online 2021年9月

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