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本文对涡轮平面叶栅中叶尖间隙泄漏对涡轮叶栅流动的影响进行了实验研究。在出口马赫数分别为0.10,0.14和0.19时利用五孔探针在叶栅出口40%弦长处对总压损失系数进行了测量,并在每个出口马赫数下详细考虑叶尖间隙高度带来的影响,即1.0%H,1.5%H,2.0%H,2.5%H和3.0%H(H为叶片高度),最后对在展向上不均匀的叶尖间隙高度所带来的影响进行了研究。实验结果表明:在当前实验条件下,对于给定叶尖间隙高度,总体上出口马赫数对总压损失系数影响不大;当马赫数给定时,增大叶尖间隙高度,叶尖间隙泄漏流带来的总压损失几乎按比例地增加;增大相邻叶片叶尖间隙高度会增大中间叶片叶尖间隙泄漏损失;在当前实验条件下相对叶尖间隙高度变化带来的影响,相邻叶片叶尖间隙高度和出口马赫数的影响显得不重要。
In this paper, the influence of tip clearance leakage on turbine cascade flow in turbine cascade is experimentally studied. The total pressure loss coefficient was measured at 40% chord at the exit of the cascade with a five-hole probe at the exit Mach numbers of 0.10, 0.14 and 0.19, respectively, and the tip clearance height was taken into account at each exit Mach number , Ie, 1.0% H, 1.5% H, 2.0% H, 2.5% H and 3.0% H (H is leaf height). Finally, the effect of uneven tip height on the spreading direction was studied . The experimental results show that for a given tip clearance height, the Mach-number of the exit nozzle has little effect on the total pressure loss coefficient under the current experimental conditions. When the Mach number is given, the tip clearance height and the tip clearance leakage flow The total pressure loss increases almost proportionally. Increasing the tip clearance height of adjacent blades will increase the tip leakage clearance loss of the middle blade. Under the current experimental conditions, the influence of the relative tip clearance height change, The effect of blade tip clearance height and outlet Mach number is not significant.