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가솔린 GDI 및 MPI 엔진용 피스톤 연소실의 형상에 따른 열부하 예측에 관한 연구
유연설 ( Younsul Yoo ),장재식 ( Jaesik Chang ),임규철 ( Gycheol Im ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
This paper is a studied to heat flow quantity from FEA temperature distribution result for pistons which is GDI & MPI Engine use. The piston`s heat source and heat sink is calculated from FE predicted temperature result respectively. The result is that heat load is influenced by geometry shape of combustion bowl on piston crown and especially, the combustion bowl on GDI piston crown area is shown to maximum temperature at bowl edge. The both pistons are carried out to structure analysis and finally fatigue analysis to verify the design.
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.
소형 디젤엔진용 분절형 스틸 단조 피스톤의 내구특성에 관한 실험적 연구
김현철(Hyunchul Kim),강우(Woo Kang),강정호(Jeongho Kang),이종인(Jongin Lee),유연설(Younsul Yoo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The goal of this research is to confirm reliable durability and evaluate the engine performance of the current aluminum alloy piston and the newly developed steel forging piston. For such purpose, the test environment was built with 2.9ℓ target engine mounted on the engine dynamometer and additional exhaust gas analysis system. Using the test environment, engine performance test was conducted, and durability test was also conducted using a dedicated piston durability test equipment for 400,000 km.
가솔린 엔진용 피스톤의 오일 갤러리 적용에 따른 피스톤 온도 특성
김충희 ( Chunghui Kim ),김현철 ( Hyunchul Kim ),한상욱 ( Sangwook Han ),유연설 ( Younsul Yoo ),서충배 ( Chungbae Seo ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
Recently, the power output of gasoline engine is getting higher and hence the thermal and mechanical load to the piston is also increased. In this study, the oil gallery which is usually used in the diesel engine piston was applied to the gasoline engine piston for the improvement of piston durability. The oil jet was installed in the cylinder block for the usage of oil gallery. As a result, the maximum temperature of the piston with oil gallery resulted in the decrease of 21.9% compared to the Base piston. Piston durability test in the engine firing condition is needed for the verification.