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RNG k-ε 난류모델을 이용한 유동박리 및 선회를 가지는 난류유동의 예측
김성구(S. K. Kim),오군섭(K. S. Oh),김용모(Y. M. Kim),이창식(C. S. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.5
This study is concerned with the critical evaluation of predicative capability of a k-ε turbulence model using the Renormalization Group(RNG) theory. The present numerical model for solution of the Navier-Stokes System is based on the modified PISO algorithms. Computations have been performed with the RNG-based k-ε model for the two-dimensional flow over a backward-facing step, a confined coaxial jet, and a swirling flow in a swirl combustor. Numerical results are compared with experimental data in terms of mean flow velocities, turbulent kinetic energy, and turbulent stresses. Numerical results clearly indicate that the RNG-based k-e turbulence model shows a significant improvement over a standard k-ε model in predicting the turbulent flows with flow separation and swirl.<br/>
정적 연소실내의 메탄-공기 혼합기의 연소 특성에 관한 연구
이창식(C. S. Lee),김동수(D. S. Kim),오군섭(K. S. Oh) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.4
This study describes the combustion characteristics of methance-air mixture with various equivalence retio and initial conditions of mixture in constant volume combustion chamber.<br/> Combustion characteristics of methane-air mixture such as combustion pressure, combustion temperature, and heat release were investigated by the measurement of combustion pressure and ternperature in the combustion chamber. The results show that maximum combustion pressure, gas temperature and rate of heat release have peaks at equivalence ratio of 1.1. Combustion duration is also the shortest at the equivalence ratio of 1.1 and it is shortened as initial mixture tempera ture increases.<br/>