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实验对比了低速条件下抽吸来流附面层前后某大转角扩压叶栅性能的变化。在叶栅壁面进行了墨迹流动显示,并对叶栅出口截面参数进行了测量。结果表明,入口附面层主要影响的区域是损失比较严重的吸力面/端壁角区。减薄大转角扩压叶栅的入口附面层可有效抑制栅内端壁附近的横向二次流、抑制角区分离、降低损失。当吸气量为入口流量的2.5%时,总压损失降低幅度达24 6%。
Experiments were carried out to compare the changes of the performance of a large-angle diffuser cascade before and after pumping the flow surface at low speed. The flow of ink was displayed on the wall of cascade and the exit section parameters of cascade were measured. The results show that the main area affected by the entrance cover is the suction surface / end wall corner zone with more serious loss. Reducing the inlet cascade of the large-angle diffuser cascade can effectively suppress the horizontal secondary flow in the vicinity of the end wall of the grid, suppressing the separation of the corner region and reducing the loss. When the inspiratory capacity of 2.5% of the inlet flow, the total pressure loss reduction of 24 6%.