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유용욱(Yongwook Yu),김용모(Yongmo Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The present study is numerically investigated for the high pressure effects on the vaporizatio<br/> process of the DME droplet. The evaporation rate of DME droplets is about twice that of dodecane droplets at the same chamber condition. The DME droplet vaporization characteristics is parametrically studied for the wide range of the operating conditions encountered with the high pressure combustion process.<br/>
[디젤엔진부문] 고압 분무 연소장에서 연료분무의 자발화 및 연소 과정 해석
유용욱(Yongwook Yu),김성구(Seongku Kim),김용모(Yongmo Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The present study is mainly motivated to investigate the vaporization, auto-ignition and combustion processes in the high-pressure engine conditions. The high-pressure vaporization model is developed to realistically simulate the spray dynamics and vaporization characteristics in high-pressure and high-temperature environment. The interaction between chemistry and turbulence is treated by employing the Representative Interactive Flamelet (RIF) Model. The detailed chemistry of 114 elementary steps and 44 chemical species is adopted for the n-heptane/air reaction. In order to account for the spatial inhomogeneity of the scalar dissipation rate, the multiple RIFs are introduced. Numerical results indicate that the RIF approach together with the high-pressure vaporization model successfully predicts the ignition delay time and location as well as the essential features of a spray ignition and combustion processes.
[디젤엔진부문] 상세 화학 반응 모델 및 RIF 모델을 이용한 디젤 분무의 자발화 과정 해석
유용욱(Yongwook Yu),김성구(Seongku Kim),김용모(Yongmo Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The auto-ignition delay time of homogeneous n-heptane/air mixtures determined with the detailed chemical mechanism of 114 elementary reaction and 44 chemical species has been investigated numerically. The coupling between complex chemistry and turbulence is treated by employing the Representative Interactive Flamelet (RIF) Model. In order to account for the spatial inhomogeneity of the scalar dissipation rate, the multiple RIFs is used. The effect of the number of RIFs on ignition delay is discussed in detail. Numerical results indicate that the present RIF approach successfully predicts the ignition delay time as well as the essential features of spray auto-ignition process.
유용욱(Yongwook Yu),이정원(Jeong-Won Lee),김용모(Yongmo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The present study is mainly motivated to investigate the vaporization, auto-ignition and spray combustion processes in 01 diesel engine using DME and n-heptans, In order to realistically simulate the dimethyl ether (DME) spray dynamics and vaporization characteristics in high-pressure and high-temperature environment, the high-pressure vaporization model has been utilized. The interaction between chemistry and turbulence is treated by employing the Representative Interaction Flamelet (RIF) model. The detailed chemistry of 336 elementary steps and 78 chemical species is used for the DME/air reaction. Based on numerical results, the detailed discussion has been made for the distinctly different combustion characteristics of DME diesel engine in term of vaporization, ignition delay, pollutant formation, and heat release rate.