The development of rotary engines is severely restricted by its low combustion efficiency and high emission. In‐cylinder flow field is known to play a major role in combustion process for rotary engines. Therefore, in the present article, a three‐dimensional dynamic simulation model considering leakage through apex seals was developed and verified by the two‐dimensional particle image velocimetry experiment results on the rotor housing central plane. Based on the three‐dimensional dynamic simulation model, the formation mechanisms of flow field in a compound intake ported rotary engine under different apex seal leakage gap sizes (0.02, 0.04, 0.06, and 0.08 mms) and engine speeds (2,000, 3,500, and 5,000 rpms) were numerically studied. The simulation results showed that there exist two formation mechanisms of the flow field in the intake stroke, that is, “side intake port dominance” and “peripheral intake port dominance.” For the three engine speeds (2,000, 3,500, and 5,000 rpms), with the increase of apex seal leakage gap size, the formation mechanism of the flow field gradually changed from “side intake port dominance” to “peripheral intake port dominance.” In addition, the influences of apex seal leakage on the volume coefficient and the turbulence kinetic energy in the combustion chamber were also investigated in detail.

中文翻译：

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考虑顶点密封泄漏的复合进气口旋转发动机流场形成机理

旋转发动机的发展受到其低燃烧效率和高排放的严重限制。众所周知，缸内流场在旋转发动机的燃烧过程中起着重要作用。因此，在本文中，建立了考虑通过顶点密封的泄漏的三维动态仿真模型，并通过在转子壳体中心平面上的二维粒子图像测速实验结果进行了验证。基于三维动态仿真模型，复合进气口旋转式发动机在不同顶点密封泄漏间隙尺寸（0.02、0.04、0.06和0.08 mms）和发动机转速（2,000、3,500和200 mms）下的流场形成机理5,000 rpm）进行了数值研究。仿真结果表明，进气冲程中存在两种流场形成机理：即“侧面进气道优势”和“周边进气道优势”。对于三种发动机转速（2,000、3,500和5,000 rpms），随着顶点密封泄漏间隙尺寸的增加，流场的形成机理逐渐从“侧进气道优势”变为“外围进气道优势”。此外，还详细研究了顶部密封件泄漏对燃烧室容积系数和湍流动能的影响。