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직접분사식 가솔린 엔진의 분사 조건 변화에 따른 유동 및 연소 특성에 관한 수치적 연구
이진휘(Jinhwi Lee),김호영(Ho Young Kim),윤석구(Sam Sukgoo Yoon) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The development of future engine generations for GDI(Gasoline Direct Injection) engine requires sophisticated combustion systems to reach reduced fuel consumption and future emission standards. The design process of these combustion systems has to be based on a fundamental knowledge of the interacting mixture preparation mechanism. Therefore, In this study, 3D full cycle simulation were carried out to investigate the effects of fuel injection timing and inclined injector angle on air-fuel mixing and to obtain subsequent combustion and emission characteristics of the GDI engine. Computational results showed that turbulence of the in-cylinder charge is enhanced by retarding fuel injection timing although the uniformity is decreased as the time for fuel-air mixing is insufficient. Also, increasing inclination angle of injector improve evaporation rate and turbulence intensity.
차유홍(You-Hong Cha),방부형(Boo Hyoung Bang),박정재(Jung-Jae Park),윤석구(Sam Sukgoo Yoon) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The greatest risk to safety in petrochemical refinery plants is an unexpected explosion. Although thermal damage to equipment may be significant, perhaps the more critical immediate risk is the pressure rise from the blast wave that could damage or destroy essential infrastructure and lead to loss of life. For this reason, numerical prediction of blast wave characteristics and their effects on the nearby structures, such as pipes and tanks, is crucial to assessing the risks of potential accidents. To this end, numerical simulations of pipe damage due to blast waves from a methane explosion are presented. Predicting the features and characteristics of the blast waves, which may result in pipe deformation, will help refinery engineers improve plant safety.
가솔린 직접분사식 엔진에서 연료온도와 피스톤 상면온도 변화가 연료 액막 형성에 미치는 영향
배진우(Jin Woo Bae),서주형(Ju Hyeong Seo),김호영(Ho Young Kim),윤석구(Sam Sukgoo Yoon),명차리(Cha Lee Myung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The subsequent behavior of the liquid fuel film has a strong influence on mixture preparation, combustion and emission. To achieve subsequent engine performance, liquid fuel film must be avoided after spray impingement. So evaporated fuel mass must be increase to reduce liquid fuel film. This study presents the CFD modeling using S/W STAR-CD to study the effect of the cylinder wall and piston crown temperature on the liquid fuel film quantity. Bai and Gosman’s model has been used for the liquid fuel film model. Results including liquid fuel film mass and thickness were obtained under transient condition and WOT (Wide Open Throttle). The result shows that Total liquid fuel film mass and average liquid fuel thickness tended to reduce when variables temperature increased more than certain range. But liquid fuel thickness on the piston wall tended to increased.