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实验研究了端壁孔式附面层抽吸对带间隙的高负荷直列叶栅流动特性和气动性能的影响,通过三种附面层抽吸方案与原型方案的对比分析,探讨了附面层抽吸抑制间隙流动、减小损失的机理。对叶片表面和下端壁进行了墨迹流动显示,并利用五孔探针对叶栅出口气动参数进行了测量,对比分析了叶栅流道内的流场特征和损失分布。结果表明,在间隙内布置抽吸孔能有效降低间隙流动动能,削弱间隙流与主流之间的相互掺混作用,减小因间隙流动引起的端壁区域流动分离,从而达到对三维流动分离的抑制,有效降低损失,且最大降幅达16.7%;间隙流动引起的流动分离和损失在流道中占主导地位,尽管在端壁沿周向合理布置抽吸孔能在一定程度上抑制近端壁的附面层或二次流发展,但这种局部效应仍不能显著改善叶栅的整体性能;端壁上不合理的抽吸控制策略反而可能影响主流的正常流动,导致损失增加,其中方案4损失增加了约3%。
The effects of end wall suction on the flow field and the aerodynamic performance of high load inline cascade with clearance were experimentally studied. By comparing and analyzing the three kinds of surface suction schemes and prototype schemes, Suction to inhibit the gap flow, reducing the loss mechanism. The flow of ink was displayed on the blade surface and the lower end wall. The aerodynamic parameters at the exit of the cascade were measured by five-hole probe. The flow field characteristics and the distribution of losses in the cascade flow passage were analyzed. The results show that the arrangement of suction holes in the gap can effectively reduce the kinetic energy of the gap flow and weaken the intermixing effect between the gap flow and the main flow and reduce the flow separation in the end wall region caused by the gap flow so as to achieve the separation of the three- Inhibition, and effectively reduce the loss, and the largest decline of up to 16.7%; gap flow caused by flow separation and loss in the flow channel dominance, although the end wall along the circumferential direction of the suction hole can inhibit the proximal wall to some extent However, this local effect still can not significantly improve the overall performance of cascades. The unreasonable suction control strategy on the endwall may instead affect the normal flow of the mainstream and lead to the increase of losses. The loss of scheme 4 An increase of about 3%.