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对具有静止顶部间隙的常规透平直叶栅和透平正弯叶栅的流道和间隙进行了测量，得到流道及间隙内的详细参数，结果表明：顶部间隙的存在对叶栅的气动性能有较大影响，使叶栅上半翼展损失明显增高，叶片正弯曲减小了叶顶后部的横向压力梯度，削弱了泄漏流与端壁横流及二者的相互作用，降低了叶栅的流动损失，明显改善了叶栅的出口流场
The flow path and clearance of conventional turbine straight cascade and turbine cascades with static top clearance were measured and the detailed parameters in the flow passage and clearance were obtained. The results show that the existence of the top clearance affects the aerodynamic performance Has a greater impact, so that the blade half-span loss significantly increased, the blade is bent to reduce the lateral pressure gradient at the back of the blade, weakened the leakage flow and the end-wall cross-flow and the interaction between the two, reducing the cascade Of the flow loss, significantly improve the cascade exit flow field