研究者詳細 - 河原　伸幸

MISC - 河原　伸幸

分割表示 242 件中 41 - 60 件目／全件表示 >>

1416 半導体レーザ吸収法を用いた水蒸気濃度計測 :水蒸気吸収スペクトルの圧力・温度依存性(燃焼・エンジンシステムIII)

河原伸幸, 冨田栄二, 郭文驍

講演論文集 2012 ( 50 ) 141601 - 141602 2012年2月

1410 エンジンシリンダ内ガス流動に及ぼす吸気管形状の影響(燃焼・エンジンシステムII)

河原伸幸, 冨田栄二, 周世宇

講演論文集 2012 ( 50 ) 141001 - 141002 2012年2月

Effect of Spark Timing on Combustion Characteristics in a Direct-Injection Hydrogen Engine

Nobuyuki Kawahara, Mithun Kanti Roy, Takashi Fujitani, Eiji Tomita

The 8th KSME-JSME Thermal and Fluids Engineering Conference (Incheon, Korea) FR02-001 1 - 2 2012年

Combustion and Emission Characteristics of a Low Emission and Highly Efficient PCCI Diesel Engine

Robert Kiplimo, Eiji Tomita, Nobuyuki Kawahara, Sumito Yokobe, Mitsui Engineering, Shipbuilding, Co

Sustainable Research and Innovation Conference 2012 at JKUAT 1 - 7 2012年

高速度カメラを用いた噴霧現象の可視化

河原伸幸

微粒化 2012年

Simultaneous Measurement of Evaporating Droplet Diameter Using Phase Doppler Anemometry and High-speed Camera

Nobuyuki Kawahara, Eiji Tomita, Hiroya Okano

12th International Conference on Liquid Atomization and Spray Systems (ICLASS2012) 1 - 8 2012年

Low Sooting Combustion in a PCCI Diesel Engine with Moderately Early Injection Timing

Robert Kiplimo, Eiji Tomita, Nobuyuki Kawahara, Sumito Yokobe, Mitsui Engineering, Shipbuilding, Co

The 8th KSME-JSME Thermal and Fluids Engineering Conference (Incheon, Korea) FR02-001 1 - 4 2012年

Effect of Equivalence Ratio on Combustion Characteristics in a Hydrogen Direct-Injection SI Engine

Mithun Kanti Roy, Nobuyuki Kawahara, Eiji Tomita, Takashi Fujitani

4th International Conference on Sustainable Automotive Technologies (ICSAT2012) 1 - 8 2012年

High-Pressure Hydrogen Jet and Combustion Characteristics in a Direct-Injection Hydrogen Engine

Roy, M, Kawahara, N, Tomita, E, Fujitani, T

SAE International Journal of Fuels and Lubricants 5 ( 3 ) 1414 - 1425 2012年

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年

高速度撮影によるポート噴射インジェクタ噴霧の液滴粒径計測

河原伸幸, 冨田栄二, 植野浩平, 住田守

微粒化シンポジウム講演論文集 = Symposium (ILASS-Japan) on Atomization 20 50 - 55 2011年12月

エンジン内燃焼火炎を見る

河原伸幸

日本機械学會誌 = Journal of the Society of Mechanical Engineers 114 ( 1114 ) 676 - 677 2011年9月

非定常噴霧におけるレーザ誘起プラズマによる着火特性

河原伸幸, 冨田栄二, 中村紳哉

微粒化 = Atomization : journal of the ILASS-Japan 20 ( 70 ) 61 - 67 2011年7月

High-pressure hydrogen jet and combustion characteristics in a direct-injection hydrogen engine

Mithun Kanti Roy, Nobuyuki Kawahara, Eiji Tomita, Takashi Fujitani

SAE Technical Papers 2011年

記述言語：英語

Hydrogen spark-ignition (SI) engines based on direct-injection (DI) promise significant advantages in terms of thermal efficiency and power output, as well as a means of overcoming problems related to knocking, backfiring, and pre-ignition. In a DI hydrogen engine, the fuel/air mixture is formed by injecting a jet of hydrogen into the air inside the combustion chamber. An Ar-ion laser beam was used as a light source to visualize the hydrogen jet in a constant-volume chamber. This allowed us to study the structure of the jet in addition to other physical processes resulting from hydrogen gas injection. Combustion experiments were conducted in a single-cylinder SI optical research engine equipped with a DI system to detect the early kernel growth assisted by the spark, as well as flame propagation. Various equivalence ratios and fuel injection timings were analyzed to identify the effects on combustion. © Copyright 2011 Society of Automotive Engineers of Japan, Inc. and SAE International.

DOI： 10.4271/2011-01-2003

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Effects of injection pressure, timing and EGR on combustion and emissions characteristics of diesel PCCI engine

Robert Kiplimo, Eiji Tomita, Nobuyuki Kawahara, Shiyu Zhou, Sumito Yokobe

SAE Technical Papers 2011年

記述言語：英語

Effects of injection parameters on combustion and emission characteristics of diesel PCCI engine operating on optical and test engine was investigated. PCCI combustion was achieved through slightly narrow included angle injector, low compression ratio coupled with exhaust gas recirculation. Analysis based on diesel spray evolution, combustion process visualization and analysis was carried out. Spray penetration was evaluated and related to the exhaust emissions. Advancing the injection timing and EGR extended the ignition delay, decreased NOx emissions and increased HC, smoke and CO emissions. Higher injection pressure led to low emissions of NOx, smoke, HC and comparable CO. Optimum spray targeting position for minimum emission was identified. Impingement on the piston surface led to deterioration of emissions and increased fuel consumption while spray targeting the upper edge of Derby hat wall showed improvement in emission and engine performance. © Copyright 2011 Society of Automotive Engineers of Japan, Inc. and SAE International.

DOI： 10.4271/2011-01-1769

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Ignition, combustion and exhaust emission characteristics of micro-pilot ignited dual-fuel engine operated under PREMIER combustion mode

Ulugbek Azimov, Eiji Tomita, Nobuyuki Kawahara

SAE Technical Papers 2011年

記述言語：英語

The objective of this study is to investigate the performance and emissions in a pilot-ignited supercharged dual-fuel engine, fueled with different types of gaseous fuels under various equivalence ratios. It is found that if certain operating conditions are maintained, conventional dual-fuel engine combustion mode can be transformed to the combustion mode with the two-stage heat release. This mode of combustion was called the PREMIER (PREmixed Mixture Ignition in the End-gas Region) combustion. During PREMIER combustion, initially, the combustion progresses as the premixed flame propagation and then, due to the mixture autoignition in the end-gas region, ahead of the propagating flame front, the transition occurs with the rapid increase in the heat release rate. © Copyright 2011 Society of Automotive Engineers of Japan, Inc. and SAE International.

DOI： 10.4271/2011-01-1764

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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

燃焼シンポジウム講演論文集 49th 2011年