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在低速风洞实验台,对具有不同深凹槽结构平面叶栅在不同间隙尺度条件下的流动特性进行了实验研究。实验采用五孔气动探针和高灵敏度及高精度的压力扫描阀测量了叶栅出口截面的气动参数,对比分析了总压损失的展向分布,并在叶栅端壁和叶片表面进行墨迹显示。结果表明,深凹槽式叶顶结构应用于本文研究的叶栅上是可行的。深凹槽尾缘开口有利于降低叶顶间隙泄漏损失,凹槽前缘开口对前缘附近局部流动产生一定影响。对整个流动通道涡生成影响不如泄漏流作用强,并且尾缘开口与前缘开口开度的匹配对叶顶间隙泄漏损失有明显的影响。
In the low-speed wind tunnel experiment platform, the flow characteristics of cascades with different deep groove structures under different clearance scales are experimentally studied. The aerodynamic parameters of exit section of cascade were measured by five-hole pneumatic probe and high-sensitivity and high-precision pressure scanning valve. The distribution of total pressure loss was compared and analyzed, and the ink was displayed on the end surface of blade and the surface of blade . The results show that it is feasible to apply deep groove roof structure to the cascades studied in this paper. The opening of the deep groove trailing edge helps to reduce the leakage loss of the tip clearance, and the opening of the groove leading edge has a certain influence on the local flow near the leading edge. The effect of flow vortex generation is not as strong as that of the leakage flow, and the matching of the trailing edge opening and the opening of the leading edge has a significant effect on the leakage loss of the tip clearance.