凹坑排列方式对高负荷扩压叶栅的影响

Influence of Arrangement of Dimples on Highly Loaded Compressor Cascade

本文采用数值方法,研究了来流马赫数为0.7时,凹坑排布方式对高负荷扩压叶栅NACA0065-K48的影响。凹坑布置在10%~32%轴向弦长,排布方式分为平行排列和交错排列两种。通过对比3种叶栅的性能参数以及流场结构发现:凹坑叶栅在负冲角时可以降低流动损失并提升扩压能力,这是由于凹坑扰动使得附面层的湍动能水平提高,进而减弱了分离泡、角区分离以及二次流动;凹坑叶栅的叶型损失增加;平行排布方式具有更宽的工作范围,在-3°冲角时可以使得总压损失减小14.26%。

In this paper,the influence of the arrangement of dimples on the highly loaded compressor cascade NACA0065-K48 was studied by numerical method,when the intake Mach number is 0.7.The position of dimples was between 10% and 32% axial chord.The arrangement was divided into two types:parallel and staggered.By comparing the performance parameters of the 3 cascades,this paper has found that cascades with dimpled surface can reduce flow loss and increase expansion capacity under negative incidence.This was due to the increased level of turbulent energy of the boundary layer caused by dimples disturbance,which weakened the separation bubble the separation of the corner zone and secondary flow;The loss of the airfoil was increased in dimpled cascades.And the parallel arrangement of dimples has a wider working range,which can reduce the total pressure loss by 14.26% at-3° angle of attack.