中文摘要：

对三套不同折转角的低速扩压叶栅的局部损失机制进行了分析。结果表明：以较高总压损失系数为特征的分离角区仅是低能流体的集中区，以上区域与主流的相邻区才是主要的局部损失产生区。角区分离前，栅内局部损失主要由端壁附面层摩擦所致，且不同折转角下流道前部局部损失生成规律变化不大。角区分离后，角区低能流体与主流相邻区的强耗散效应使得其局部损失急剧增加，而端壁局部损失下降，但总损失增加，折转角越大，以上趋势越明显。

英文摘要：

The local losses mechanisms study of three low-speed compressor cascades with the different turning angle were presented. The results indicate that, the separation corner is an accumulation zone of low energy fluid rather than high local loss zone. While in the outer of the separation, high local losses are generated by the serious shear effects between the low energy fluid and the mainstream. Upstream the separation point, the friction in the boundary layer dominates the local loss in the flow passage. Moreover, the local losses are identical for the three cascades with different turning angles. Downstream the separation point, the end wall local losses decrease. However, a local losses increase is resulted by the dissipation in the adjacent zone between the separation and the mainstream, which leads to a total losses increase. For the cascade with large turning angle, higher local losses are generated in the aft part of the cascade passage.