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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science >Experimental investigations on instability evolution in a transonic compressor at different rotor speeds
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Experimental investigations on instability evolution in a transonic compressor at different rotor speeds

机译：跨音速压缩机不同转子转速下不稳定性演变的实验研究

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摘要

Experimental investigations are conducted to study the instability evolution in a transonic axial flow compressor at four specific rotor speeds covering both subsonic and transonic operating conditions. Two routes of evolution to final instability are observed in the test compressor: at low rotor speeds, a disturbance in the rotor tip region occurs and then leads to rotating stall, while at high rotor speeds, a low-frequency disturbance in the hub region leads the compressor into instability. Different from stall and surge, this new type of compressor instability at high rotor speed is initiated through the development of a low-frequency axisymmetric disturbance at the hub, and we name it partial surge. The frequency of this low-frequency disturbance is approximately the Helmholtz frequency of the system and remains constant during instability inception. Finally, a possible mechanism for the occurrence of different instability evolutions and the formation of partial surge are also discussed.
机译：进行实验研究以研究跨音速轴流压缩机在涵盖亚音速和跨音速工作条件的四个特定转子速度下的不稳定性演变。在测试压缩机中，观察到了两种导致最终不稳定的演变路径：在低转子转速下，转子尖端区域会发生扰动，然后导致旋转失速，而在高转子转速下，轮毂区域会引起低频扰动压缩机进入不稳定状态。与失速和喘振不同，这种新型的高转子压缩机不稳定性是由轮毂上的低频轴对称扰动引起的，我们将其称为部分喘振。这种低频干扰的频率大约是系统的亥姆霍兹频率，并且在不稳定开始时保持恒定。最后，还讨论了发生不同的不稳定性演化和形成局部浪涌的可能机制。

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