Presentations -

An Investigation of Charge Stratification in DME HCCI Engine Based on Multi-Zone Modeling

Dongwon Jeong , Ock Taeck Lim, Norimasa Iida

2010 JSAE Annual Conference (Yokohama, Japan) , 

2010.05

, 

Oral presentation (general), (社)自動車技術会

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This work investigates the potential of in-cylinder thermal stratification and fuel stratification for extending the operating ranges in HCCI engines, and the coupling between thermal and fuel stratification. Computation results are employed. The computations were conducted using a multi-zone version of the Senkin application of the CHEMKINII kinetics rate code, and kinetic mechanism for di-methyl ether. This study shows that the potential of thermal and fuel stratification for extending the high-load operating limit. However, a combination of thermal stratification and fuel stratification is not more effective than above stratification techniques for extending the operating ranges showing similar results of fuel stratification.

Influence of Cooled EGR rate on the High-Load limits of Fuel stratified DME HCCI Engine by Numerical Analysis

Dongwon Jeong , Ock Taeck Lim, Norimasa Iida

2010 JSAE Annual Conference (Yokohama, Japan) , 

2010.05

, 

Poster presentation, JSAE

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Cooled exhaust-gas recirculation (Cooled EGR) is known as the effective way to mitigate knock in HCCI engines, which helps to extend operating range to high-load limits. However, the misfire is caused easily in low-load limits with high CO. Fuel stratification is combined with EGR to compensate those problems. CO2 is used in order to simulate the effects of cooled EGR in numerical analysis. A combination of cooled EGR and fuel stratification shows extended operating ranges to high-load limits. However, high CO is produced in operating point due to the low combustion temperature with significantly low NOx.

Investigations of HCCI Combustion by Charge Inhomogeneity and its Robustness Using Chemiluminescence Imaging

内木武虎，飯田訓正

第47回燃焼シンポジウム (札幌コンベンションセンター「SORA」) , 

2009.12

, 

Oral presentation (general), 日本燃焼学会

Mechanism Analysis of Influence of Engine Speed on HCCI Combustion by using Numerical Calculation

Hiroki Iino, Kenji Shigetoyo, Mari Nagae and Norimasa Iida

2009 SETC (Small Engine Technology Conference), November 2-5, 2009 Hotel Equatorial, Penang (Hotel Equatorial Penang) , 

2009.11

, 

Oral presentation (invited, special), SAE/JSAE

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The novel concept for engine technology is required to deal with the environmental problems. Homogeneous charge compression ignition engine is noted by the high efficiency and low emissions. However, the homogeneous charge compression ignition engine has many problems to overcome. Many researchers have investigated the homogeneous charge compression ignition engine to improve the performance and to introduce to markets. In the present paper, the fundamental of homogeneous charge compression ignition engine and the research trends were considered.

An Investigation of the Potential of Thermal and Mixing Stratifications for Reducing Pressure Rise Rate on HCCI Combustion by using Rapid Compression Machine

Daisuke Shirota ,Norimasa Iida

2009 SETC (Small Engine Technology Conference), November 2-4, 2009 Hotel Equatorial, Penang (Hotel Equatorial Penang) , 

2009.11

, 

Oral presentation (general), SAE/JSAE

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Thermal and mixing stratifications have been thought as one of the ways to avoid an excessive pressure rise on HCCI combustion. The purpose of this research is to investigate the potential of thermal and mixing stratifications for reducing PRR (Pressure Rise Rate) on HCCI combustion. The pre-mixture with thermal and mixing stratifications is charged in RCM (Rapid Compression Machine). After that, the pre-mixture is compressed and in that process, in-cylinder gas pressure and chemiluminescence images are obtained and analyzed. Furthermore, experimental results are compared with the computational results calculated by using multi-zone model for analyzing these mechanisms.

Analysis of the combustion dispersion mechanism in HCCI Engine

Chao Shi ,Norimasa Iida

2009 SETC (Small Engine Technology Conference), November 2-5, 2009 Hotel Equatorial, Penang (Hotel Equatorial Penang) , 

2009.11

, 

Oral presentation (general), SAE/JSAE

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Delaying CA50(Crank Angle of 50％ Heat Release ) of the HCCI engine to expansion stroke can lead to high indicated thermal efficiency as well as the avoidance of knocking. However, this method could induce the problem of cycle variability. In this study, the cycle-to-cycle variation of a HCCI engine fueled with DME was investigated. Experimental parameters of each cycle, such as in-cylinder temperature, pressure and gas flow rate, were recorded by fast response system, and analyzed consequently. Moreover, the interdependency between the combustion and the performance parameters were evaluated.

The Research about Thermal Stratification Effect on Pressure Rise Rate in Supercharged HCCI Engine based on Numerical Analysis

O Seok Kwon, Dong Won Jeong, Ock Taeck Lim (University of ULSAN), Norimasa Iida (Keio University)

2009 SETC (Small Engine Technology Conference), November 2-5, 2009 Hotel Equatorial, Penang (Hotel Equatorial Penang) , 

2009.11

, 

Oral presentation (general), SAE/JSAE

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The HCCI engine is a next generation engine, with high efficiency and low emissions. However a rate of pressure rise is a major limitation for high load range. Recently, we are able to reduce the rate of pressure rise using thermal stratification. Nevertheless, this was insufficient to produce high power. Without the higher equivalent ratio, one way to improve the power is to increase the intake boost pressure. It is suggested that the rate of pressure rise is reduced by thermal stratification and the power is increased by boost pressure at the same time. The objective of this work is to understand the characteristics of combustion, knock and emissions for using both thermal stratification and the boost pressure. The calculations are performed by CHEMKIN and modified SENKIN. As a result of increasing the boost pressure, a higher IMEP was attained while the rate of pressure rise increased only slightly in the HCCI with thermal stratification.

HCCI Combustion Challenge and Future

Norimasa Iida，Hyeonsook Yoon

2009 SETC (Small Engine Technology Conference), November 2-5, 2009 Hotel Equatorial, Penang (Hotel Equatorial Penang) , 

2009.11

, 

Oral presentation (invited, special), SAE/JSAE

　View Summary

The novel concept for engine technology is required to deal with the environmental problems. Homogeneous charge compression ignition engine is noted by the high efficiency and low emissions. However, the homogeneous charge compression ignition engine has many problems to overcome. Many researchers have investigated the homogeneous charge compression ignition engine to improve the performance and to introduce to markets. In the present paper, the fundamental of homogeneous charge compression ignition engine and the research trends were considered.

Analysis of the effect of Eco-driving on Real-world Emission

Susumu Sato, Hisakazu Suzuki (National Traffic Safety and Environment Laboratory), Masayoshi Miya, Norimasa Iida (Keio University)

自動車技術会2009年秋季学術講演会 (仙台国際センター) , 

2009.10

, 

Oral presentation (general), (社)自動車技術会

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運輸部門の省エネルギーおよび地球温暖化ガス削減のために，エコドライブ活動が推進されている。しかしエコドライブによりCO2削減が期待されるものの，NOx等の排出ガスの排出量増大が懸念される。本研究では車載型排出ガス計測システムを搭載したディーゼル車を用いて，エコドライブがリアルワールドエミッションに及ぼす影響について解析を行った。

Analysis of Hot-spot Mechanism Using On-road Driving Vehicle with On-board Measurement System

Masayoshi Miya (Keio University Graduated School) Susumu SATO (National Traffic Safety and Environment Laboratory)　Norimasa Iida (Keio University)

第50回大気環境学会年会講演 (慶應大学　日吉キャンパス) , 

2009.09

, 

Oral presentation (general), 大気環境学会

自動車を取り巻く環境問題の現状と今後の展望

IIDA NORIMASA

第50回大気環境学会年会講演 (慶應大学　日吉キャンパス) , 

2009.09

, 

Oral presentation (invited, special), 大気環境学会

Combustion Research on Injternal Combustion Engine: Past, Present and Future

IIDA NORIMASA

日本機械学会2009年度年次大会 (岩手大学) , 

2009.09

, 

Oral presentation (invited, special), 日本機械学会

パネルディスカッションエンジン： 基礎研究と産学連携（大学の研究活動 ～大学からの研究発表の推移～）

IIDA NORIMASA

第20回内燃機関シンポジウム (早稲田大学) , 

2009.09

, 

Oral presentation (invited, special), (社)自動車技術会

Numerical Analysis on Mechanism of Influence of Engine Speed on HCCI Combustion Characteristics

飯野裕喜，飯田訓正

第20回内燃機関シンポジウム (早稲田大学) , 

2009.09

, 

Oral presentation (general), (社)自動車技術会

Analysis of the combustion dispersion mechanism in HCCI Engine

史超，飯田訓正

第20回内燃機関シンポジウム (早稲田大学) , 

2009.09

, 

Oral presentation (general), (社)自動車技術会

Numerical Study of EGR Effects on HCCI Engine Combustion Based Detailed Chemical Reactions

Gen Chen (Graduate School of Science and Technology, Keio University), Norimasa Iida (Keio University, Japan), Zuohua Huang (State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, China)

第20回内燃機関シンポジウム (早稲田大学) , 

2009.09

, 

Oral presentation (general), (社)自動車技術会

A Study about the Potential of Thermal and Mixing Stratifications for Reducing Pressure Rise Rate on HCCI Combustion

代田大祐，飯田訓正

第20回内燃機関シンポジウム (早稲田大学) , 

2009.09

, 

Oral presentation (general), (社)自動車技術会

An Investigation of HCCI Combustion Processes of Stratified Charge Mixture Using Rapid Compression Machine

Ock Taeck Lim, Hiroaki Nakano, Daisuke Shirota, Norimasa Iida

6th Asian DME Conference (Soel, Korea) , 

2009.09

, 

Oral presentation (general), Korea DME Association

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Introduction of heterogeneity of mixture has been thought as one of the way to avoid Knocking by reducing the pressure rise rate in HCCI Combustion. The purpose of this research is to investigate the effect of heterogeneity, especially thermal stratification and fuel strength stratification on HCCI Combustion fueled with DME and n-Butane. Thermal stratification is formed in Combustion Chamber of Rapid Compression Machine with ３ Kinds of pre-mixture has different properties. The stratified charge mixture is adiabatic compressed and on that process, in cylinder gas pressure and two-dimensional chemiluminescence images are measured and analyzed.

素反応数値計算を用いた機関回転速度がHCCI燃焼特性に及ぼす影響の解析

飯野裕喜，重豊健志，長永麻里，飯田訓正

第46回燃焼シンポジウム (京都テルサ) , 

2008.12

, 

Oral presentation (general), 日本燃焼学会

Effect of Intake gas Pressure and Temperature on Combustion Process in HCCI Engine -Numerical analysis of elementary reaction using PRF Fuels/Air mixture-

長永麻里，飯野裕喜，重豊健志，飯田訓正

第46回燃焼シンポジウム (京都テルサ) , 

2008.12

, 

Oral presentation (general), 日本燃焼学会