不同范围进口畸变对亚声轴流压气机的影响

借助于计算流体动力学商用软件NUMECA，通过使用10通道非定常数值模拟的方法，研究了不同范围的进口气流畸变对亚声速轴流压气机性能、稳定性和流场的影响。研究对象是西北工业大学单级轴流亚声压气机转子。不同范围的进口畸变是通过在进口径向段设置不同范围栏杆的方法产生的。结果表明:进口畸变不但降低了压气机转子的性能，而且使转子的稳定工作范围减少。畸变范围越大，上述现象越明显。通过详细分析内部流场表明:畸变后，由于部分通道叶顶间隙泄漏流溢流和附面层分离的影响，造成通道内严重的堵塞，进而诱发转子失速。畸变范围越大，影响也越大。 

Influence of inlet distortion of different ranges on subsonic axial-flow compressor

By means of computational fluid dynamics commercial software NUMECA, the effects of inlet distortion of different range on the performance, stability and flow-field in a subsonic axial-flow compressor were investigated with ten-annulus unsteady numerical method. The research object was the single-stage subsonic axial-flow compressor rotor of Northwestern Polytechnical University. The inlet distortion of different range was generated by setting some barriers on the inlet ring surface. Results showed that inlet distortion didnt only degrade the performance of the compressor rotor, but also decreased the stability of the rotor. And the larger distortion range indicated the more obvious phenomenon mentioned above. The fundamental flow mechanism was obtained by detailed analysis of the flow-field in rotor passage. Inlet distortion led to serious blockage in tip blade passage and further induced rotor stall because of the influence of the tip clearance leakage flow and the separation of boundary layer in some tip blade suction. Like above, the larger distortion range meant the more serious influence.