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일체형 스틸 단조 피스톤을 장착한 디젤엔진의 성능에 관한 연구
김현철(Hyunchul Kim),나병철(Byungchul Na),이봉현(Bonghyun Lee),김덕중(Duckjung Kim),임규철(Kyuchul Lim),최승배(Seungbae Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the diesel engine development is actively progressing due to influence on environment pollution and global warming. In this study, in order to analyze the change of power, fuel consumption and exhaust gas performance due to weight and heat transfer characteristics between the aluminum piston, the articulated and the uni-steel forged piston, fuel consumption and exhaust gas characteristics are analyzed using a engine and chassis dynamometer. Results indicate that the combustion characteristics of the articulated steel forged piston are similar to that the uni-steel forged piston.
피스톤 경량화에 따른 가솔린 가관에서의 성능 및 배출가스 특성에 관한 연구
김지훈(Jihun Kim),이성욱(Seangwock Lee),조용석(Yongseok Cho),임규철(Kyuchul Lim),유연설(Younsul Yoo) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Heavy air pollution is an increasing concern as well as global warming, which requires strict reduction of GHG(greenhouse gas) emission. CO₂ is a main contribution to global warming, responsible for over 90 percent of total GHG emission. The amount of CO₂ is closely related to fuel consumption rate. So, CO₂ emission can be reduced by improving fuel consumption rate of the vehicle. In this research, commercially manufactured gasoline engine was equipped with light weight piston, torque and power of the engine were tested and compared with reference engine. Also, in order to deprive the results, emission analyzer was used to measure emission level and flowmeter was equipped to calculate the fuel consumption rate characteristic. Thus, this research may provide the fundamental data for making strategies of emission level reduction through piston weight lightening.
분절형 스틸 단조 피스톤을 장착한 디젤엔진의 배출가스 특성
김현철(Hyunchul Kim),강우(Woo Kang),나병철(Byungchul Na),이호길(Hokil Lee),이종인(Jongin Lee),김용태(Yongtae Kim),임규철(Kyuchul Lim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
To meet the world's ever stringent environment regulation, the focus of current research on diesel engines are to reduce the size and to enhance the power of engine at the same time. Such requirement inherently increases the pressure of the combustion chamber. Under this high pressure, the operational pressure range of the current aluminum piston reaches about to the limit requiring a piston with higher operational pressure limit. The steel forged piston is under development as a potential replacement of the aluminum piston. In order to analyze the change of fuel consumption rate and exhaust gas characteristics due to weights and heat transfer characteristics difference between aluminum piston and steel forged piston, fuel consumption rate and exhaust gas characteristics are analyzed using chassis dynamometer. The characteristics of exhaust gas was analyzed through CVS75 mode experiment. Results indicate that the characteristics of exhaust gas of the articulated steel forged piston is similar to that of aluminum alloy piston.
직접분사식 소형 디젤엔진의 연소특성에 관한 3차원 시뮬레이션 연구
김현철(Hyunchul Kim),김병수(Byoungsoo Kim),강우(Woo Kang),정재우(Jaewoo Chung),강정호(Jeongho Kang),임규철(Kyuchul Lim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, simulation of a light duty direct injection diesel engine using a three dimensional numerical method is presented in order to analyze flow characteristics, injection, and combustion phenomenon. A solid model is constructed after analyzing the specification of the subject engine, and moving meshes are generated for various crank angles. Flow fields of the combustion chamber generated at the intake stroke are analyzed, and the behavior of swirl and tumble is studied. Heat flow characteristics of the diesel engine is also studied through analyzing injection and combustion considering chemical reaction. The result is used to analyze temperature, velocity, pressure, and exhaust gas component of the combustion chamber.