稳态联合畸变下多级轴流压气机的气动稳定性分析

ON STUDY OF PREDICTING AERODYNAMIC STABILITY IN THE MULTI-STAGE AXIAL COMPRESSORS WITH INLET COMBINED PRESSURE AND TEMPERATURE DISTORTIONS

发展了一种分析稳态压力 -温度联合畸变下多级轴流压气机气动稳定性的逐级平行压缩系统模型。导出了基于双对角线格式的数值预测方法。对三级实验压气机进行数值分析后 ,给出了压气机进口稳态压力、压力 -温度联合畸变与压气机稳定裕度损失之间的定量关系 ;并给出了压气机失稳首发级的识别方法。

A stage by stage parallel compression system model is developed for predicting aerodynamic stability in the multi stage axial compressors with inlet steady state pressure and temperature distortions. A numerical technique based on bidiagonal schemes is used to solve the conservative equations. The predictions for a three stage axial compressor with inlet pressure distortion or combined pressure and temperature distortions are given. The relationships between inlet pressure distortion or combined pressure and temperature distortions and the surge margin losses are obtained. A quantitative criterion of predicting the first stage flow instability is presented.