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对某跨声速压气机转子在不同工作流量下的叶尖非定常流场进行了数值研究.结果显示:大流量状态下,该转子叶尖流场几乎不发生振荡.此时,叶尖流场可以按定常流场进行分析;小流量状态下,叶尖泄漏涡大幅振荡,相邻叶片通道内的叶尖泄漏流之间也存在周期性相互干涉.其结果是在稳定状态时出现由于叶尖泄漏涡的振荡及其周向传播造成的“旋转不稳定”现象.“旋转不稳定”流场结构主模态旋涡个数大约为40%的叶片通道个数;其周向尺度占据2~3个栅距.
The unsteady flow field at a certain transonic compressor rotor at different working flow rates is studied numerically. The results show that under the condition of high flow rate, there is almost no oscillation in the tip flow field of the rotor. At this time, the tip flow field It can be analyzed according to the steady flow field. In the condition of small flow, the tip leakage vortex oscillates greatly, and there are also periodic interferences between the tip leakage flow in the adjacent vane channels. As a result, The “swirling instability” phenomenon caused by the oscillation of the leakage vortex and its circumferential propagation. “The number of vortex channels in the main mode of the” swirling instability "flow field structure is about 40% Occupy 2 to 3 pitch.