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차경세(K.S.Cha),최종욱(J.W.Choi),김복석(B.S.Kim),박찬국(C.G.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In this study, the spray models incorporated into the GTT code were tested for sprays injected for sprays injected in quiescent, swirling gases and for the sprays impinging on a flat wall, and the validity of the models has been confirmed by comparing the calculated results with the experimental data. Using this code, the gas flow, spray behavior and fuel vapor distributions in the combustion chamber of a D.I engine have been numerically analyzed with respect to the constant injection pressure and the injection pressure varing with injection time.<br/>
차경세(K. S. Cha),최종욱(J. W. Choi),박찬국(C. G. Park) 한국전산유체공학회 2000 한국전산유체공학회지 Vol.5 No.1
In this study. the spray models incorporated into the GTT code were tested for sprays injected in quiescent, swirling gases and for the sprays impinging on a flat wall, and the validity of the models has been confirmed by comparing the calculated results with the experimental data. Using this code, the gas flow, spray behavior and fuel vapor distributions in the combustion chamber of a D.I engine have been numerically analyzed with respect to the constant injection pressure and the injection pressure varying with injection time.
분사각 및 스월 변화에 따른 디젤분무의 특성에 관한 수치 해석
정훈(H. Jung),차경세(K. S. Cha),박찬국(C. G. Park) 한국전산유체공학회 2000 한국전산유체공학회지 Vol.5 No.3
In high-pressure diesel engine, the injected fuel spray impinges on the piston cavity surface due to the short distance between the injection nozzle and the cavity wall. The behavior of the impinging spray has the great influence on the dispersion of fuel, the evaporatioin, and the mixture formation process. In this study, the numerical simulation using the GTT code was performed to study the gas flows, the spray behaviors, and the fuel vapor distributions in the combustion of a D.I engine for variation of spray angle and swirl ratio.
피스톤에 의해 유입되는 유동에 대한 유한요소법을 이용한 수치해석
최종욱(J. W. Choi),박찬국(C. K. Park) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.2
The FVM(Finite Volume Method) have been used mainly for the flow analyses in the piston-cylinder. The objective of the present study is to analyze numerically the piston-driven intake flows using the FEM(Finite Element Method). The FEM algorithm used in this study is 4-step time-splitting method which requires much less execution time and computer storage than the velocity-pressure integrated method and the penalty method. And the explicit Lax-Wendroff scheme is applied to nonlinear convective tenn in the momentum equations to prevent checkerboard pressure oscillations. Also, the ALE(arbitrary Lagrangian Eulerian) method is adopted for the moving grids. The calculated results show good agreement in comparison with those by the FVM and the experimental results by the LDA.
[디젤엔진부문] 분사각 및 스월 변화에 따른 디젤분무의 특성에 관한 수치 해석
정훈(H.Jung),차경세(K.S.Cha),박찬국(C.G.Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In high-pressure diesel engine, the injected fuel spray impinges on the piston cavity surface due to the short distance between the injection nozzle and the cavity wall. The behavior of the impinging spray has the great influence on the dispersion of fuel, the evaporatioin, and the mixture formation process. In this study, the numerical simulation using the GTT code was performed to study the gas flows, the spray behaviors, and the fuel vapor distributions in the combustion of a OJ engine for variation of spray angle and swirl ratio.
수직ㆍ수평 관통류를 갖는 수평 다공층에서 자연대류 연구
서석진(S.J. Seo),박찬국(C.K. Park) 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.1
The effect of vertical or horizontal throughflow on natural convection in horizontal porous layer was investigated. The computations were performed by employing Darcy-Brinkman-Forchheimer equation to consider the effect of inertia and viscous effect. The patterns of streamlines and isotherms are observed by changing the strength of throughflow. The vertical throughflow stabilizes the natural convection in porous layer. It also disturbs the developing vertical and horizontal velocity component of natural convection cell and increases the critical modified Rayleigh number. The horizontal throughflow influences the stabilization of natural convection in porous layer much more than the vertical throughflow. And it changes a stable convection into a oscillatory convection.