高速轴流压气机叶尖流动特性试验

Experiment on Tip Flow Property of High Speed Axial Flow Compressor

为研究压气机转子叶尖流动特性，通过高频动态压力传感器测量其第一级转子壁面静压，录取了多个换算转速下的试验数据，并采用等相位平均方法处理。结果表明：相对换算转速0．6以上槽道激波明显，且随着转速的升高，激波强度增加；叶尖泄漏流动明显，叶片前缘位置最强烈，沿流向逐渐减弱，影响了近1／2弦长、1／3倍叶栅流场；0．7及以上高转速状态下，在叶栅弦长约1／3处，流场的压力突跃脉动峰一峰幅值达到最大，高达15—20kPa，导致较大的气动激振，叶片需承受较大的周期性气动负荷。

To investigate compressor tip flow property, the wall static pressure of its lth rotor was measured using high frequency dynamic pressure sensors. The phase average method was employed to analyze the test data collected at different corrected speeds. The analysis results show that the shock wave in channel is in evidence when the relative corrected speed is above 0.6 and the strength of shock wave increases with the compressor speed. The leakage flow is clear and strong at the leading edge and it weakens along with the flow direction, affecting the nearly 1/2 length of chord and 1/3 of cascade channel flowfield. The fluctuating pressure Vp-p is largest about 15 - 20 kPa at the 1/3 length of chord when the speed is above 0.7 which will bring about aerodynamic excitation and the blade will undertake large periodic aerodynamic load.