失速团动态演变特性试验

对一台单级低速轴流压气机进行了节流特性试验,通过周向布置动态压力传感器测得了节流过程的动态压力信号,结合时域、频域及极坐标可视化的分析方法,研究了节流过程的失速团动态演变特性.结果表明:失速先兆类型为模态波失速先兆,其传播频率约为40%转子转动频率;压气机进入失速初期349.5r时周向形成两个失速团,360r时两个失速团合并为单个失速团,压气机进入深度失速时单个失速团重新分裂并在410r时稳定为两个失速团;压气机退出失速的过程中,665r时两个失速团重新合并为单个失速团,674.5r时压气机退出失速.

Experiment of dynamic evolution characteristics of stall cells

The throttling characteristics of a single-stage low-speed axial compressor were experimently investigated. Dynamic pressure signals were measured during the throttling process by dynamic pressure sensors in circumference. In order to analyze the dynamic evolution characteristics of stall cells during the throttling process, time domain analysis and frequency domain analysis were conducted combined with polar coordinate visualization. The results indicate that stall precursor type is modal wave and the frequency of modal wave is about 40% rotor rotation frequency; the compressor generates two stall cells at 349.5r in circumference at the early stage of stall, and two stall cells merge into one at 360r; one stall cell begins to split as the compressor runs into deep stall and splits into two stall cells at 410r; two stall cells merge into one again at 665r as the compressor exits stall, and finally the compressor exits the stall at 674.5r.