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고압상태에서의 디젤연료분무의 연소 및 매연가스배출 특성
권영동(Y.D. Kwon),김용모(Y.M. Kim),김세원(S.W.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
The present study is focused on the combustion characteristics of a Diesel spray in the high-pressure environment, The primary and secondary atomization is modelled using the wave instability breakup model and autoignition process of a Diesel spray is represented by the Shell ignition model Soot formation is kinetically controlled and soot oxidation is modeled to account for surface chemistry. The NOx formation is based on the extended ZeIdovich NOx model Numerical results indicate that the elevated pressure of combustion chamber significantly influences the soot/NOx emission as well as the overall combustion processes.<br/> <br/>
터보과급 및 EGR을 사용하는 직접분사식 디젤엔진의 연소특성에 미치는 Ar과 He첨가의 영향
권영동(Y. D. Kwon),김용모(Y. M. Kim),박신배(S. B. Park),백현종(H. J. Paik),이동권(D. K. Lee) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.5
The combustion characteristics of DI Diesel engine using turbo charging and EGR are numerically studied. Computations are carried out for the wide range of turbocharged pressures, EGR ratios, and Ar/He dilution. Numerical results indicate that the Ar/He dilution in the intake gas significant-ly influence the engine performance, the spray combustion process, and the pollutant formation.<br/>
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/>
김용모(Y. M. Kim),권영동(Y. D. Kwon),김후중(H. J. Kim),김세원(S. W. Kim) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.1
The present study is mainly motivated to numerically simulate the auto ignition and combustion process of a diesel spray in RCM and effects of design parameters on combustion and engine performance in the DI diesel engine using EGR. In case of the burning spray in RCM, special emphasis is given to the auto ignition process coupled with the fluid mechanics and chemical reaction. Computations are carried out for a wide range of 'operating condition in terms of temperature, concentration of oxygen and carbon dioxide of the intake gas in the DI diesel engine. Numerical results indicate that the mixing process along the edges of spray jet has a crucial role for autoigni-tion and combustion process. Temperature and concentration of O₂ and CO₂ of intake gas significantly influence the combustion characteristics and engine performance in the diesel/EGR environment.
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/>