多级轴流式压气机静压升特性研究

对多级轴流式压气机在几个典型工况下各级静压相对于设计点静压的变化特性进行了研究。研究发现,中低转速工作条件下,压气机后面级静压的变化对发动机工况的改变不如前面级敏感,因此,按常规方法监控压气机后面级流动参数的变化难于及时发现发动机中小状态时的压气机气动不稳定征兆信号。研究表明,为提高检测压气机气动不稳定征兆的时效性,应考虑在压气机前面级安装传感器,监控中低转速下的压气机气动失稳征兆信号。

Investigation on the Static-pressure-rise Characteristics of Multi-stage Axial Flow Compressors

The characteristics of static pressure changing at stage exits of a multi-stage axial flow compressor relative to the design points at several typical operating modes are investigated.On low-to-mid operating conditions,the pressure change at the rear compressor stages caused by engine operating mode transition is not as sensitive as that at the front compressor stages,so it's hard to detect compressor instability precursory signals through the conventional method of monitoring the flow parameters at compressor exit.Then,to improve the efficiency of compressos instability precursory signal detection,it's necessary to install sensors on the front compressor stages,which would be useful for the detection of imminent compressor instabilities at low-to-mid rotating speeds of engine.