组合抽吸对大转角扩压叶栅性能的影响

实验研究了低速条件下在端壁和吸力面同时进行附面层吸除对某大转角扩压叶栅性能的影响.在叶片表面及端壁进行了墨迹流动显示,并对叶栅出口截面进行了测量.基于实验的抽吸槽布置方式:端壁吸气主要影响区域是吸力面角区;吸力面抽吸可以减小角区范围,延迟叶片吸力面附面层转捩,改善中径处流场;组合抽吸则优化了叶栅整体流场,使流动更加均一高效,由于削弱了端壁和吸力面附面层间的相互作用,组合抽吸在大吸气量下优于前两种吸气方式.

Effect of compound boundary layer suction on the performance of a high-load diffusion compressor cascade with a large camber angle

The effect of compound boundary layer suction on the aerodynamic performance of a compressor cascade with a large camber angle was experimental investigation through the ink-trace flow visualization and the measured outlet flow field. Experimental results show that suction on the endwall mainly influents the suction surface corner; suction on the suction surface not only shrinks the endwall corner region, but also delays the transition of the suction surface boundary layer, and improves the flow field around the midspan; the whole flowfield is improved when both of the suction slots work, and the performance precedes each of the former two at high suction flow rates as the interaction between the boundary layer of endwall and suction surface is better controlled.