叶尖泄漏流和引射效应对跨声速串列转子失速机制的影响

为探究跨声速串列转子的失速机制，利用数值模拟的手段对不同间隙情况的某跨声速串列转子的叶尖流场进行分析.研究发现:前排二次泄漏区会对失速产生重要影响；叶尖泄漏流和引射效应是前排二次泄漏区流场结构的决定因素，而间隙大小直接影响着两者的强弱.当前排大间隙时，叶尖泄漏流强，是前排二次泄漏区流场的主导因素，这时失速首先发生在前排；当前排间隙减小时，引射效应增强，并逐渐成为主导因素，这时前排二次泄漏区的堵塞情况得到改善，失速区域转移到后排.改变前排间隙对该跨声速转子的性能有更显著的影响，当前排为最先失速排时，改变后排间隙对串列转子性能没有显著影响. 

Effect of tip leakage flow and ejection on stall mechanism of transonic tandem rotors

In order to investigate the stall mechanism of transonic tandem rotor,the transonic tandem rotor tip flow field in different tip clearance was studied.The results show that the flow field of zone two has a great effect on stall and it is determined by the tip leakage flow and ejection.Furthermore,the tip leakage flow and ejection are determined by the tip clearance.When the forward blade tip clearance is large,the tip leakage flow is much stronger and becomes the leading factor of zone two.Thus,forward blade becomes the stall position.When the forward blade tip clearance is reduced,ejection grows stronger and becomes the leading factor of zone two.This leads that the stagnation area of the tip leakage flow in zone two reduces and after blade becomes the stall position.The forward blade tip clearance has more effect on stall than the after blade tip clearance.What's more,after blade tip clearance has little effect on the tandem rotor when forward blade is the stall position.