Experimental study of the mechanism of improving stall margin of low speed axial-flow compressor with micro-injection under rotating inlet distortion

An experimental investigation was carried out in the paper to clarify the flow mechanism of how micro-injection improves the stall margin of a low speed axial-flow compressor under rotating inlet distortion.The results show that,in distorted sectors,the tip leakage flow is pushed forward to the leading edge;as the mass flow rate is decreased,tip leakage flow would spill out of the blade passage and trigger the rotating stall.Micro-injection can inhibit the formation of distortion disturbances and then delay the occurrence of rotating stall.