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進排氣門流量係數對引擎容積效率的影響

The Effect of the Flow Coefficient of Valve for Volume Efficiency

摘要


流量係數是引擎馬力表現的重要指標,此研究是針對如何改善進排氣門之流量係數,提升流量係數相對也會增加容積效率。在自然進氣的狀況下,要將容積效率提升到100%是每個車廠夢寐以求的事,因為容積效率代表的就是引擎的扭力,所以流量係數是引擎上非常重要的參數。繪製進排氣門之模型,利用Fluent模擬進排氣門之流量係數,比較實驗與模擬之差異,修改氣門桿之斷面積與氣門面之曲率,比較與原始設計的進排氣門之差異,修改進排氣門對流場的影響及探討。

並列摘要


Flow coefficient is an important indicator of engine performance, this study is how to improve the flow coefficient of the intake and exhaust valve, improve the flow coefficient will increase volumetric efficiency. In the natural intake engine, try to reach 100% volumetric efficiency is the challenge, because the volumetric efficiency represents the engine torque, so the flow coefficient is very important on the engine parameters.Using Gambit to crate intake model and export model, CFD software calculate the result and analysis, decrease the numerical valve error from simulation to experiment. Transform the valve geometry to increase flow coefficient.

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