关键词: 压气机;扩压叶栅;边界层;附面层吸除;流动分离;实验研究

Abstract: A highly-loaded compressor cascade was studied and analyzed in detail firstly. And then in order to improve its aerodynamic performance, two kinds of boundary layer suction methods were proposed.They are endwall suction and endwall plus suction surface suction,respectively. The experiments were carried out in a low speed wind tunnel. The results show that boundary layer suction is an effective way to enhance the aerodynamic performance of the highly-loaded compressor cascade. The flow condition near the solid surfaces is improved through the boundary layer suction.Therefore,the corner stall is weakened and the high loss region within the flow passage is reduced. As the suction flow rate increases, the favorable effect of boundary layer suction on the aerodynamic performance of the compressor cascade becomes more significant. Boundary layer suction from different places, such as from endwall or from endwall plus suction surface, has its own mechanism.

Key words: Air compressor; Compressor cascade;Boundary layer; Boundary layer suction; Separated flow; Experimental investigation