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김태훈(Taehoon Kim),김용모(Yongmo Kim),김성구(Seong-Ku Kim) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
본 연구에서는 액체로켓 분사기에서 임계압력 이상의 추진제의 혼합과 연소과정을 수치적으로 모사하여 분석하고자 하였다. 이 과정에서 확장된 k-ε 난류 모델을 이용하여 난류 속도장을 예측하였고 고압에서의 실제 유체 효과를 고려하기 위하여 혼합 추진제의 물성치는 SRK 상태 방정식을 이용하여 계산하였다. 또한 난류 확산 화염에서의 좀 더 정확한 난류와 화학반응의 상호작용을 고려하기 위하여 실제 유체 효과를 고려할 수 있는 층류 화염편 모델을 이용하였다. 수치적인 계산을 바탕으로 이상기체 가정을 사용한 결과와 비교하여 실제 유체의 효과와 기체메탄/액체산소 동축 전단 분사기의 제트화염 구조를 상세하게 살펴보았다. This study has been mainly motivated to numerically model the supercritical mixing and combustion processes encountered in the liquid propellant rocket engines. In the present approach, turbulence is represented by the extended k-ε turbulence model. To account for the real fluid effects, the propellant mixture properties are calculated by using SRK (Souve-Redlich-Kwong) equation of state. In order to realistically represent the turbulence?chemistry interaction in the turbulent nonpremixed flames, the flamelet approach based on the real fluid flamelet library has been adopted. Based on numerical results, the detailed discussions are made for the real fluid effects and the precise structure of gaseous methane/liquid oxygen coaxial jet flame.
김태훈(Taehoon Kim),김용모(Yongmo Kim),김성구(Seong-Ku Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
The supercritical conditions are typically encountered in the high pressure combustion devices such as liquid propellant rockets and gas turbine engines. Significant real-fluid behaviors including steep property variations take place when the fluid transits through the thermodynamic transcritical regime. This study has been mainly motivated to numerically model the supercritical or transcritical mixing and combustion processes encountered in the liquid propellant rocket engines. In the present approach, the extended k-ε model is used to represent the turbulence motion. To account for the real fluid effects, the propellant mixture properties are calculated by using SRK (Souve-Redlich-Kwong) equation of state. In order to realistically represent the turbulence?chemistry interaction in the turbulent nonpremixed flames, the flamelet approach based on the real fluid flamelet library has been adopted. Based on numerical results, the detailed discussions are made for the real fluid effects and the precise structure of gaseous hydrogen/liquid oxygen coaxial jet flame.
실제유체 기반의 화염편 모델을 이용한 고압 조건하의 LOx/GH₂ 화염구조 해석
김태훈(Taehoon Kim),배준경(Junkyung Bae),김용모(Yongmo Kim),김성구(Seong-Ku Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
The supercritical conditions are typically encountered in the high-pressure combustion devices such as liquid propellant rockets and gas turbine engines. Significant real-fluid behaviors including steep property variations take place when the fluid transits through the thermodynamic transcritical regime. To develop the comprehensive combustion model to take into account the detailed chemical kinetics and the large variation of thermophysical properties for chemically reacting flows at transcritical and supercritical conditions, the present work numerically investigates the effects of high pressure on laminar flamelet structures. The special emphasis is also given to the differential diffusion effects on the local flame structure relevant to the liquid rocket combustor.
유용욱,김용모,You, Yongwook,Kim, Yongmo 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.8
The present study is numerically investigated for the high-pressure effects on the vaporization process in the convection-dominating flow field. Numerical results agree well with the available experimental data. The fuel droplet vaporization characterization is parametrically studied for the wide range of the operating conditions encountered with the high-pressure combustion process of turbocharged diesel engines.
김후중,김용모,김세원,Kim, Hoojoong,Kim, Yongmo,Kim, Sewon 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.9
A lifted laminar flame structure has been numerically analyzed. The present study employs the physical submodels including the detailed chemical kinetics and the variable transport properties. The validation cases Include a lifted laminar CH4/air flame with a central diluted fuel jet and a surrounding fuel-lean coflow. Numerical results indicate the present approach successfully simulate the detailed structure and mechanism of the triple flame in the lifted laminar methane flame.