子午等截面环叶栅损失增长分析

Analyse of the Loss Growth in a Annular Cascade with an Meridian Passage of Equal Section

根据栅前至栅后１２个横截面内的气动参数和沿叶高９个叶型的静压系数测量结果，分析了气流绕流叶栅损失增长的根源。实验结果证明：（１）在叶栅进口端壁附面层分离，形成复杂进口涡系；（２）在叶栅出口在径向压力梯度的作用下，主流、尾流、集中涡系和新生附面层相互掺混；是气流绕流叶栅损失增长的两个根源。

On the basis of the measurements of the aerodynamic parameters on 12 cross - sections from the up stream to the downstream of the cascade and the static pressure coefficients on 9 profiles along the blade height, the origins of the loss growth of the airflow passing through the cascade were analysed. The experimental results that the separations of the endwall boundary layers near the blade leading edges form the complex inlet edge vortices and the mainstream、wakes、 centralized vortices and new boundary layers are intermixed under the actions of the radial pressure gradient, which are two origins of the loss growth of the airflow passing through the cascade.