研究者詳細 - 河原　伸幸

MISC - 河原　伸幸

分割表示 242 件中 61 - 80 件目／全件表示 >>

点火プラグ組込型センサによる燃料濃度計測(共著）

河原伸幸, 冨田栄二

日本燃焼学会誌 52 ( 159 ) 17 - 25 2010年

点火プラグ実装型燃料・残留ガス濃度計測システム(共著）

河原伸幸, 冨田栄二

自動車技術 64 ( 2 ) 56 - 61 2010年

Effect of component of biomass-based gaseous fuels on combustion in a super-charged gas engine with micro-pilot injection(共著）

Eiji Tomita, Nobuyuki Kawahara, Murari Mohon Roy

Proceedings of Thirty-Second Task Leaders Meeting 138 - 144 2010年

Fuel Concentration Measurement of Premixed Mixture in a Spark-Ignition Engine Using Spark-Induced Breakdown Spectroscopy(共著）

Kawahara, N, Tomita, E, Oka, T, Ikeda, Y

15th Int. Symp. on Application of Laser Techniques on Fluid Mechanics 2.11.3 2010年

Residual Gas Concentration Measurement inside a Spark-ignition Engine Using Infrared Laser Absorption Method(共著）

Kawahara, N, Tomita, E, Ohtsuki, A

15th Int. Symp. on Application of Laser Techniques on Fluid Mechanics 2.8.3 2010年

Knock Characteristics and Combustion Spectroscopy in a Small Natural Gas Engine Ignited with a Pilot Injection of Gas Oil(共著）

Eiji Tomita, Nobuyuki Kawahara, Atsushi Sakane

Second International Conference of Energy Engineering (ICEE-2) 31 2010年

Visualization of Knocking Combustion in a Hydrogen Spark-Ignition Engine(共著）

Mithun Kanti Roy, Nobuyuki Kawahara, Eiji Tomita

18th World Hydrogen Energy Conference 2010 - WHEC2010 78 ( 6 ) 141 - 148 2010年

DISI用インジェクタノズル出口近傍におけるPDA計測

河原伸幸, 冨田栄二, 柴田祐一, 住田守

微粒化シンポジウム講演論文集 = Symposium (ILASS-Japan) on Atomization 18 215 - 220 2009年12月

位相ドップラ法を用いた噴霧液滴径・速度の同時計測

河原伸幸, 冨田栄二

微粒化 = Atomization : journal of the ILASS-Japan 18 ( 63 ) 96 - 102 2009年9月

F208 Study of a Supercharged Dual-Fuel Engine Fueled by Producer Gases with Varying Injection Parameters and Hydrogen Content

Roy Murari Mohon, Tomita Eiji, Kawahara Nobuyuki, Harada Yuji, Sakane Atsushi

動力・エネルギー技術の最前線講演論文集 : シンポジウム 2009 ( 14 ) 487 - 488 2009年6月

記述言語：英語出版者・発行元：一般社団法人日本機械学会

This study investigated the effect of injection pressure and injection quantity for pilot fuel on engine performance and exhaust emissions of a supercharged producer gas-diesel dual fuel engine. Injection pressure of 80 MPa with the injection quantity of 3 mg/cycle showed the best results. Effect of hydrogen (H_2) content in producer gas on engine performance and emissions is also investigated with two types of producer gases with varying H_2 content with the optimum injection pressure-quantity condition. Experimental strategy was to optimize the injection timing for the maximization of engine power at different fuel-air equivalence ratios without knocking and within the limit of maximum cylinder pressure. Better combustion, engine performance and exhaust emissions (except NOx) are obtained with the high H_2 content producer gas than that with standard producer gas, especially at leaner conditions. Moreover, a broader window of equivalence ratio is found with highest thermal efficiencies with the high H_2 content producer gas.

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412 ガソリン噴霧特性と計測技術(FM-2 噴霧燃焼過程の基礎)

河原伸幸

関西支部講演会講演論文集 2009 ( 84 ) "4 - 11" 2009年3月

413 レーザ干渉計を用いた流体温度計測(熱工学III)

冨田栄二, 河原伸幸, 山縣俊博

講演論文集 2009 ( 47 ) 119 - 120 2009年2月

808 レーザ誘起ブレイクダウン分光法によるエンジンでの空燃比計測(エンジンシステムII)

河原伸幸, 冨田栄二, 顧健

講演論文集 2009 ( 47 ) 271 - 272 2009年2月

赤外吸収法によるエンジンシリンダ内ガス濃度計測

河原伸幸, 冨田栄二

日本機械学会2009年度年次大会講演資料集 2009 181 - 182 2009年

PDA analysis near nozzle region of Transient Spray from Multi-hole Injector of DISI engine

Fatma Ahmed, Nobuyuki Kawahara, Eiji Tomita, Mamoru Sumida

The 13th Annual Conference on Liquid Atomization and Spray Systems- Asia, pp.48-55. 2009年

Microscopic Visualization of Transient Spray from Multi-hole Injector of DISI Engine

M. Esmail, N. Kawahara, E. Tomita, M.Sumida

ICLASS2009,Paper Number: 063 2009年

Mixture formation process in a spark-ignition engine with ethanol blended gasoline

Nobuyuki Kawahara, Eiji Tomita, Takuya Kadowaki

SAE Technical Papers 2009年

記述言語：英語

In this study, fuel concentration measurements in a spark-ignition (SI) engine with ethanol blended gasoline were carried out using an optical sensor installed in the spark plug with laser infrared absorption technique. The spark plug sensor for in-situ fuel concentration measurement was applied to a port injected SI engine. The molar absorption coefficients of ethanol blended gasoline were determined for various pressures and temperatures in advance using a constant volume vessel with electric heating system. Ethanol blended gasoline with high volumetric ratios shows lower molar absorption coefficients due to lower molar absorption coefficients of ethanol. The molar absorption coefficients of ethanol blended gasoline can be estimated by considering the molar fraction of each component. Mixture formation processes of ethanol blended gasoline were investigated using spark-plug sensor installed in a spark plug in a port-injected SI engine with changing the fuel injection timing in an intake port. Delaying injection of ethanol blended gasoline caused a leaner fuel concentration around the spark plug and cycle-to-cycle fluctuation of combustion. Copyright © 2009 SAE International.

DOI： 10.4271/2009-01-1957

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Effect of fuel injection parameters on engine performance and emissions of a supercharged producer gas-diesel dual fuel engine

Murari Mohon Roy, Eiji Tomita, Nobuyuki Kawahara, Yuji Harada, Atsushi Sakane

SAE Technical Papers 2009年

記述言語：英語

This study investigated the effect of some pilot fuel injection parameters, like injection timing, injection pressure and injection quantity on engine performance and exhaust emissions of a supercharged producer gas-diesel dual fuel engine. The engine has been tested to be used as a co-generation engine and its power output is an important matter. Experiments have been done to optimize the injection timing, injection pressure and injection quantity for the maximization of engine power. At constant injection pressures, there is an optimum amount of pilot injection quantity for that maximum engine power is developed without knocking and within the limit of maximum cylinder pressure. Above or below of that amount engine power is decreased. Higher injection pressures generally show better results than lower ones. However, good results can also be obtained with lower injection pressure, if maximum power timings can be selected. Two-stage combustion is obtained as a mentionable fact which is an indicator of maximum power output conditions as well as a precursor of knocking combustion. Smoke is found almost zero throughout the experiments and hydrocarbons (HC) are very low. However, carbon monoxide (CO) level at all experimental conditions is very high. Nitrogen oxides (NOx) at maximum power conditions are also very high. These need to be reduced. Copyright © 2009 SAE International.

DOI： 10.4271/2009-01-1848

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Effect of EGR on combustion and exhaust emissions in supercharged dual-fuel natural gas engine ignited with diesel fuel

Eiji Tomita, Yuji Harada, Nobuyuki Kawahara, Atsushi Sakane

SAE Technical Papers 2009年

記述言語：英語

The combustion and exhaust emissions characteristics of a supercharged dual-fuel natural gas engine with a single cylinder were analyzed. We focused on EGR (Exhaust Gas Recirculation) to achieve higher thermal efficiency and lower exhaust emissions. The combustion of diesel fuel (gas oil) as ignition sources was visualized using a high-speed video camera from the bottom of a quartz piston. The luminous intensity and flame decreased as the EGR rate increased. Furthermore, the ignition delay became longer due to the EGR. Characteristics of the combustion and exhaust emissions were investigated with changing EGR rates under supercharged conditions. The indicated mean effective pressure and thermal efficiency decreased with increasing EGR rate. In addition, NOx emissions decreased due to the EGR. In this study two-stage combustion was observed. When two-stage combustion occurred, it was supposed that auto-ignition of compressed natural gas and air mixture occurred during the flame development. However, knocking did not occur. Two-stage combustion occurred under the condition of low EGR rate and advanced injection timing. The indicated mean effective pressure and thermal efficiency increased, during two-stage combustion
however, NOx emissions also increased by a large amount compared to normal combustion. High indicated mean effective pressure, high thermal efficiency, and low NOx emissions were achieved just before the occurrence of two-stage combustion by changing EGR rate and injection timing of diesel fuel. Copyright © 2009 SAE International.

DOI： 10.4271/2009-01-1832

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実用ガソリンインジェクタにおける微粒化過程の可視化（液糸分裂，液滴の衝突・合体挙動）

河原伸幸, 冨田栄二, 中越真一, 住田守

微粒化，Vol.18, No.62, pp.61-67. 18 ( 62 ) 61 - 67 2009年

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