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中文摘要：
本文以压比为4.7的Krain叶轮为研究对象,采用CFD技术研究了不同工况下叶顶间隙泄漏流的特征,以及叶顶间隙大小和叶轮进口径向畸变对泄漏流的影响。结果表明随着质量流量减小,泄漏流引起的损失增加,泄漏涡涡核轨迹和泄漏流-主流交界面向叶片前缘移动,在失速工况下溢出叶片前缘。叶顶间隙越大,泄漏流引起的损失越大,泄漏涡涡核轨迹与叶片之间的夹角越小。增加叶顶区域流体动量,可推迟泄漏流溢出叶片前缘,反之则促进泄漏流溢出叶片前缘。
英文摘要：
In this paper, the krain impeller with a pressure ration of 4.7 is choose as the study object. The blade tip clearance flow structures at different operating conditions and the effects of the radial distortion at impeller inlet on the tip clearance flow are investigated by CFD. The results show that, the losses induced by tip clearance flow enhance and the interface between tip clearance vortex trajectory and main flow moves forward as the mass flow rate decrease, and the interface spills out the leading edge of adjacent blade at stall condition. The losses induced by tip clearance flow enhance and the angle between tip clearance vortex trajectory and main flow decreases as the tip clearance increases. Increasing the fluid momentum in the blade tip region is an effective method to delay the spilling out the blade leading edge of tip clearance flow, and conversely, it will promote the spilling out.
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