旋转进口畸变频率对跨声速压气机稳定性影响的数值研究

Numerical Investigation for Stability Influences of Rotating Inlet Distortion Frequency on a Transonic Compressor

为了研究旋转进口畸变对于压气机失速过程的影响,以及探讨最易诱发压气机失速的扰动频率即特征频率存在性的问题,采用非定常方法计算研究了4种不同频率的进口旋转畸变对跨声压气机Rot or37失速起始过程的影响。结果表明:在同样幅值条件下,当旋转频率与失速扰动频率相近时的畸变会引起失速,反之亦然;进口畸变的低压区引起部分叶片通道内流动结构失稳后,在叶尖泄漏涡破碎的作用下通道内形成严重堵塞,从而导致压气机失速。该方法能够较好地描述转子中失速团的发展过程,同时得出了进口畸变频率对失速过程影响的物理机制。

In order to investigate the effect of rotating inlet distortion on compressor stall process, and discuss the existence of a specific disturbance frequency （Eigen frequency） which is easy to induce the rotating stall,the effect of four kinds of different inlet rotating frequencies on the Rotor 37 stall process of a transonic compressor was calculated and investigated by the unsteady numerical simulation methods. The results show that when the rotating frequency is similar to the stall disturbance frequency, the inlet distortion frequency could cause the rotating stall on the same amplitude condition, while the compressor rotating grows into stable when the frequencies in different values. After the low pressure district of inlet distortion lead to flow structure in parts of the blade passage destabilization, the breakdown of tip leakage vortex developed into blockage and induced the existence of rotating stall. The developing procedure of stall cell in the rotor is well described and the mechanism influence of inlet distortion frequency on the stall process is obtained by the method.