端壁收敛与倾斜叶片的综合应用

THE SYNTHETIC APPLICATION OF THE ENDWALL CONVERGENCE AND LEANED BLADES

一、引言 大量的理论分析与实验研究证明:具有最佳倾斜角的叶片能较大地改善叶栅锐角侧的气动性能,具有良好收敛型线的端壁可降低叶型损失和叶栅该端的二次流损失。若将两者合理匹配,能否使两者的优点集中于同一叶栅,这是一个很有研究价值的问题。

By experiments of turbine rectangular stator cascades with a low aspect ratio and different shaped endwalls the well convergent molded line of the endwall was elected. The endwall was installed on the side of obtuse angle of a cascade with leaned blades, and the exit flow field of this cascade was surveyed in detail. The measurement results show that the synthetic effect of the endwall convergence and blade leaning reduces the profile losses and secondary flow losses of the both ends of the cascade.