轴流式压气机机匣壁面静压脉动特征研究

运用小波包分析和概率密度函数分析的方法，对某型发动机节流过程中，压气机第一级静子机匣壁面静压信号的脉动特征及概率密度函数特性进行了研究。研究发现，随着发动机工作点沿共同工作线趋近喘振边界，压气机第一级静子机匣壁面静压信号中几个特定频带内信号分量的脉动幅度增强、概率密度函数分布展宽，可以作为试验发动机节流过程中气动失稳的信号特征。

Investigation on the Characteristics of Axial Flow Compressor Casing Wall Static Pressure Fluctuations

Based on wavelet packet analysis and probability density function analysis, the characteristics of signal fluctuation and probability density function distribution of the first compressor stator casing wall static pressure, which was measured during the throttling process of a certain engine, are investigated. It is observed that along with the gradual approaching of engine working point to the surge line, the fluctuation magnitude of the first compressor stator casing wall static pressure contents at several specific frequency bands will increase, and corresponding probability density function distribution will become wider. The observed signal characteristics can serve as an aerodynamic instability indication of the test engine during the throttling process.