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이병서(Byoung Seo Lee),이준식(Joon Sik Lee),유정열(Jung Yul Yoo) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
It is well known that organized vortex rotations swirl and tumble greatly affect the mixing, the<br/> combustion and heat transfer processes in engine cylinder. We have developed 3 dimensional numerical<br/> simulation codes whose predictions make good agreement with the experimental data. Large eddy<br/> simulation based on Smagorinsky subgrid scale model was adopted to describe the turbulence of<br/> in-cylinder flows. The tumble motions generated by different inclination angles between valve-port and<br/> cylinder head have been calculated. The results show that the angles between direction of induced flow<br/> and cylinder walls which the flow collides with play a great role in the formation and generation of<br/> tumble motions. Therefore, it is inferred that seat angle and inclination angle are important factors of<br/> engine design. In addition, the numerical results of different engine speed -1000 rpm and 3000 rpm are<br/> very similar in the flow structure.