变几何涡轮间隙流动损失约占涡轮流动损失的1/3,如何采用有效的控制方法改善端区泄漏流动显得格外有意义.本文应用数值计算方法和标准k-ω两方程湍流模型,研究了叶顶开槽对变几何平面叶栅间隙泄漏的控制及损失机理,并在此基础上对五种不同安装角下叶栅总体参数和端区流动形态对比,计算结果显示:叶顶开槽处理会增大端区泄漏流动阻力,从而对端区泄漏流动具有较为明显的抑制作用;在可转导叶由负角度向正角度旋转时,泄漏量逐渐减小,总压恢复系数逐渐增大.“,”Variable geometry turbo gap flow losses accounted for about 1/3 of the turbine flow loss,how to adopt effective control method for improving end zone leakage flow is particularly meaningful.In this paper,numerical calculation methods and criteria k-ω turbulence model are used to study the mechanism of control and loss of variable geometry slotted tip cascade gap leak,and on this basis,comparing five different angle Cascade overall parameters and the end zone flow pattern,the results show:the tip slotting treatment increases the leakage flow resistance in the end zone,and thus more obvious leakage flow inhibition;when rotating guide vane angle from negative to positive angle,the amount of leakage decreases,and total pressure recovery coefficient increases.