压气机通道端壁附面层区叶片载荷分布研究

为了探索叶片载荷分布对端壁附面层区流动的影响,设计出3套平面叶栅,叶片载荷分别趋前、居中和靠后。对于低速流动,采用实验和三维Navier-Stkoes方程方法对叶片表面、叶栅出口流场进行了研究。研究表明:叶片载荷靠后叶片(No.3)性能较叶片载荷趋前(No.1)和居中(No.2)叶片差;No.2叶片与No.1叶片比较,出口损失小,但落后角较大,扩压能力较小;在进口端壁附面层一定时,叶片前缘附近的端壁附面层区叶片力亏损变化与叶片力变化呈正相关;端壁面与叶片吸力面之间构成的角区内角涡,没有造成靠近后缘端壁附面层区吸力面静压明显下降。 

Investigation on Compressor Blade Load Distribution in Endwall Regions

In order to find out the effects of blade load distribution on the flow in endwall boundary layers,three sets of planar cascades were designed,in which the blade loads tending to blade front,middle and rear parts,are numbered as No 1,No 2 and No 3 respectively.The static pressure on the blades and the cascade outlet flow fields are investigated by experiments and three dimensional Navier Stokes equation methods.The following conclusions were drawn:The performance of the No cascade #3 is inferior to that of 2 cascades #1 and #2;In the endwall region of cascade #2,the flow outlet loss is smaller but the deviation angles are larger and the pressure elevating ability is weaker than those of cascade #1;In a given inlet endwall boundary layer,the variation of the blade force defect is positively correlative to the blade force variation;In the corner region formed by the blade suction surface and the endwall,corner vortex does not induce obvious decrease of pressure on the suction surface of blade rear part in the endwall region;The outlet vortex strength of cascade #2 is smallest.