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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.
In order to explore the stall mechanism of transonic rotor, the numerical simulation is used to analyze the tip flow field of a transonic supersonic tandem rotor with different clearances. It is found that the front secondary leakage zone has an important effect on stall ; The tip leakage flow and ejection effect are the determinants of the flow field structure in the front secondary leakage zone, and the gap size directly affects the strength of the two. In the current row of large clearance, the tip leakage flow is strong, The secondary leakage area flow field of the leading factor, then the stall occurred first in the front row; the current row clearance decreases, the injection effect increases, and gradually become the dominant factor, then the front row of the second leakage area of congestion has been improved, Stall area shifts to the back row.Changing the front clearance has a more significant effect on the performance of the transonic rotor, and changing the back row clearance has no significant effect on the performance of the tandem rotor when the current row is the first stall row.