叶片正弯曲对压气机叶栅叶片表面流动的影响

为了研究叶片正弯曲对压气机叶栅气动性能的影响,对具有可控扩散叶型(CDA)的直叶片和正弯曲25°叶片平面叶栅进行了实验研究和数值模拟,获得了两种叶栅叶片表面流场显示结果以及不同冲角下叶片表面静压系数的分布。结果表明,叶片正弯曲对其吸力面流动影响较大,吸力面近出口处两端的径向二次流区相比于直叶栅而言明显增加。正弯曲叶片吸力面形成"C"型压力分布,叶片负荷沿叶高和弦长重新分布,这种负荷的重组是弯曲改变叶栅流场的主要因素。

Influence of positive curving on blade surface flow of compressor cascade

To investigate the influence of blade positive curving on the aerodynamics performance of compressor cascade, experiment and numerical simulation have been conducted with rectangle compressor cascades consisting of two type of blades, straight and 25° positive curved blades, with controlled diffusion airfoils. The flow visualization results and the static pressure coefficient distribution on blade surface are acquired. It concludes that blade positive curving has great influence on suction surface flow, and the radial secondary flow region on the suction surface endwall corner region near the cascade exit increases clearly than that of the straight blade. On suction surface of positive curved blade, the "C" type static pressure distribution along the blade height is created, and the load of the blade is changed along the blade height and chord, which are the main factors to affect the flow in cascade.