中文摘要：

为深入分析旋流畸变问题，发现叶片式旋流畸变发生器产生旋流流场的机理和旋流畸变对压气机稳定性的影响机制，本文开展了旋流畸变发生器与压气机的耦合数值仿真。分析计算结果，认为叶尖脱落涡的叠加效应是产生旋流的主要机理，旋流结构对转子叶尖区域的扰流作用是造成转子提前失速的重要原因。建立了S弯进气道仿真模型，通过对S弯进气道与高亚声速压气机进行耦合仿真计算，研究了S弯进气道出口旋流流场的形成机制，初步探讨了S弯进气道出口旋流流场对压气机稳定性的影响。S弯进气道出口形成的对涡结构靠近压气机机匣，这种局部的涡结构会影响部分转子叶片叶顶区域的流动结构，从而导致压气机失速边界右移。

英文摘要：

The mechanisms of swirl distortion and its effect on the stability of a compressor are determined by analyzing the flow field.In order to analyze the problem of swirl distortion in detail,a coupled numerical simulation of the compressor flow field and the generation of swirl distortion is carried out.The numerical result shows that one main mechanism causing a swirling flow is the superimposed effect of blade tip vortex shedding,which has a destabilization influence on the rotor blade tip area and which is the main reason of an early rotor stall.Another mechanism for the formation of swirl is an S-shaped duct for which a simulation model is designed and the coupling mechanism between the S-shaped inlet and a high-subsonic compressor is analyzed.The formation mechanism of the swirl flow in the S-shaped inlet and its effect on the stability of the compressor is studied.The vortex formed near the outlet of the S-shaped inlet is close to the compressor casing,where it affects the flow field in the rotor blade tip area such that compressor stall occurs more likely.