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이승엽(S.Y.Lee),최영돈(Y.D.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
In this study, a computational code was newly developed in which a three dimensional body-fitted moving grid system was adopted and also the physical contravariant components were taken as the dependent variables. The present code was applied to the intake and compression process in a toroidal bosl-in-piston chamber.<br/> The transient calculation of the flou fields and the global analysis in the chamber revealed the generation, distortion and corruption of the swirling and tumbling vortices and those influences on turbulence kinetic energy. A strong interaction was found between the shape and position of the bowl and the swirling turbulent flow. It was also observed that the squist flow generated by the existence of the bowl reincreased the swirl ratio and showed the "spin-up" op tumble ratio during compression stroke.<br/>