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김용모(Y.M.Kim),권영동(Y.D.Kwon),김후중(H.J.Kim),김세원(S.W.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The autoignition and combustion processes of a diesel spray are numerically studied. To simulate the autoignition and the combustion process in a diesel spray, the wave instability breakup model, the Shell ignition model, and the modified eddy breakup model are implemented in the KIVA-Ⅱ code. The coupling mechanism between fluid mechanics and chemical reaction associated with autoignition is discussed in detail. Numerical results indicate that the mixing process along the edges of spray jet has a crucial role for autoignition and combustion process. We also investigate effects of injection pressure and concentration of O₂ and CO₂ on the autoignition process in the diesel/EGR environment.<br/>
직접분사식 디젤엔진의 매연가스 배출특성과 엔진성능에 미치는 분사압력의 영향
김용모(Y.M. Kim),권영동(Y.D. Kwon),김세원(S.W. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The effects of injection pressure on pollutant formation and performance in DI diesel engine are numerically investigated. The primary and secondary atomization is modelled using the wave instability breakup model and drop-wall interaction process is modelled using the Stick model and the modified Jet impingement model. Compared to the Stick model, the modified Jet model significantly improves the predicative capability in terms of chamber pressure and heat release rate in the DI Diesel engines. Numerical results indicate that soot emissions decrease by increasing the injection pressure. However, increase in the injection pressure beyond a certain level does not improve the soot and NO. emission trade-off significantly.<br/>
문윤완(Y.W.Moon),유용욱(Y.W.You),김용모(Y.M.Kim),김세원(S.W.kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The spray dynamics and vaporization characteristics in high-pressure and high-temperature environment are numerically investigated. In order to evaluate the predictive capability of the high-pressure vaporization model developed in this study, computations are carried out for two diesel-like test conditions. Numerical results indicate that the present high-pressure vaporization model reasonably well predicts the basic features of the high-pressure evaporating spray dynamics.<br/>