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本文在低速单转子轴流压气机上对于周向单槽进行了实验研究。首先在叶片前后两端选取了两个单槽,在壁面不同弦向位置进行了动态静压信号的测量。通过静压信号的功率谱分析发现,前端单槽可以明显抑制泄漏流非定常波动所对应的频带,而后端单槽对该频带无明显改变。为了进一步讨论后端单槽的作用机理,又针对后端单槽设计了放气和引气两种扩稳结构,通过实验和数值模拟验证了其扩稳效果。结果表明,在后端单槽底部放气会降低扩稳效果,而在单槽底部放气后引回前缘进行喷气的结构可以进一步提升扩稳效果。
In this paper, a single-slot circumferential slot experimental study was carried out on a low-speed single-rotor axial-flow compressor. First, two single slots are selected at the front and back of the blade to measure the static hydrostatic pressure at different chordwise positions of the wall. Through the power spectrum analysis of static pressure signal, it is found that the front-end single slot can obviously restrain the frequency band corresponding to the unsteady flow of leakage flow, while the single end slot does not change the frequency band obviously. In order to further discuss the mechanism of the back-end single groove, two stabilizing structures of deflation and bleed air are also designed for the back-end single groove, and the stabilization effect is verified through experiments and numerical simulations. The results show that deflation can be reduced by deflation at the bottom of a single tank, and the jetting structure leading to the leading edge after deflation at the bottom of a single tank can further enhance the stabilizing effect.