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입자 추적법을 이용한 4 밸브 가솔린 기관의 실린더 내 텀블 유동 특성
이창식,전문수,정성환,Lee, Chang-sik,Chon, Mun-soo,Chung, Sung-hwan 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.9
The in-cylinder flow field of gasoline engine comprises unsteady compressible turbulent flows caused by the intake port, combustion chamber geometry and the change of the spatial shape. Thus the quantitative analysis of the in-cylinder bulk flow plays an important role in the improvement of engine performances and the reduction of exhaust emission. The influences of tumble intensifying valve (TIV) and swirl intensifying valve (SIV), and various intake-flow conditions are compared with the tumble ratio obtained by the measured results of the in-cylinder gas flow. In order to obtain the quantitative analysis of the in-cylinder gas flows of gasoline engine this investigation applied the particle tracking method to the analysis of gas flow characteristics. Various intake conditions such as tumble and swirl intensifying valve, the deactivated condition of one valve among two intake valves, and the other factors of gas flow are considered.
단일 프레임 입자 추적법을 이용한 흡입 2밸브 가솔린 기관의 실린더 내 정상 유동 해석
이창식,이기형,임경수,전문수,Lee, Chang-Sik,Lee, Gi-Hyeong,Im, Gyeong-Su,Jeon, Mun-Su 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.5
Analysis and control of intake charge motion such as swirl and tumble are very important factors in improving the gasoline engine performance. In this paper, single-frame PTV (particle tracking velocimetry) is used to investigate intake tumble patterns in a steady flow test rig of gasoline engine with dual-intake-valve and pent-roof combustion chamber. Intake tumble pattern is quantified in accordance with blockage ratio of TIV (tumble intensifying valve) with single- frame PTv.The view of the instantaneous 2-D velocity field gives a realistic understanding of in-cylinder flow field. Thus it is confirmed that PTV is a effective tool in engine design. In conventional port, two tumble structures appear clearly, and the larger one is observed under the exhaust valve side and the smaller is right below the intake valve side. The larger vorticity is observed in TIV port, thus it is concluded that TIV have an effect on intensified tumble motion in cylinder flow.