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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.
냉각 갤러리 형상이 디젤엔진 피스톤 온도에 미치는 영향
김충희(Chunghui Kim),신윤섭(Yunsub Sin),이기수(Geesoo Lee),김현철(Hyunchul Kim),유연설(Younsul Yoo),김희수(Heesu Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The weakest point in the piston of the engine is a piston bowl edge where mechanical and thermal loads are directly transferred. One of the promising technologies to complement this issue is remelting piston crown, which increases the durability and strength of the piston. In this study, experimental study was carried out with three types of pistons (base piston, re-melting piston, and down gallery piston). Piston surface temperature was measured for the purpose of . Numerical analysis using FEM was then conducted to evaluate the experimental results. It was revealed that re-melting piston can apply to the conventional diesel engine since the piston temperature from a re-melting piston applied engine was almost the same with that from base piston engine without sacrifice of power and torque.
디젤 엔진용 Re-melting 강화 기술을 적용한 피스톤의 성능 특성
김충희(Chunghui Kim),신윤섭(Yunsub Sin),이기수(Geesoo Lee),김현철(Hyunchul Kim),유연설(Younsul Yoo),김희수(Heesu Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The thermal performance characteristics and engine validation tests are carried out to investigate re-melting reinforced cast aluminum pistons of which the bowl rim area are welded by the technology of tungsten inert gas (TIG). Diesel engine technology have progressively resulted in continuous advanced in specific power, presently reaching 70kW/L in order to cost-effectively meet demanding regulation and fuel economy. The newly designed pistons can satisfy the desirable design option for thermo-mechanical fatigue and high cycle fatigue in critically loaded areas. The combustion bowl re-melting process is described and engine validation tests such as engine power, torque and cylinder pressure are performed and show to equivalent level of a base engine. In addition, the effects of the cooling gallery on the piston temperature are studied by using templugs, which are temperature sensitive steels and are used for determining the maximum temperature in locations.
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.
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.