叶片正弯对间隙流动的影响  

AN EFFECT OF BLADE POSITIVE CURVING ON THE FLOW IN A BLADE TIP CLEARANCE

作　　者：韩万今[1] 黄洪雁[1] 侯建东 王仲奇[1] 

机构地区：[1]哈尔滨工业大学,哈尔滨150001

出　　处：《工程热物理学报》1997年第4期429-434,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金

摘　　要：详细测量了常规直叶片与正弯叶片栅间隙内与上、下游流场，比较两套叶栅的实验结果发现：叶片正弯减小了叶顶后3／5轴向弦长范围内的横向压力梯度，并消除了上通道涡，因而大大削弱了泄漏流与瑞壁横流之间的相互干扰，相对漏气量与叶栅流动损失都显著降低．The flow fields were measured in the blade tip clearances of the cascade with the conventional straight and positive curved blade. That is found out by the comparison of experimental results of two cascades: blade positive curving reduces the crosswise pressure gradient in the range of 3/5 axial chord of blade tip rear and eliminates the upper passage vortex,thereby the interaction between the leakage flow and the endwall crosswise flow is weakenedconsiderably, the relative leakage and the cascade flow losses are cut down obviously.

关 键 词：涡轮叶栅 正弯叶片 叶顶间隙 叶栅 间隙流动 

分 类 号：TK123[动力工程及工程热物理—工程热物理]