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本文在低速风洞上对叶顶间隙尺寸为0.036 m的常规直叶栅的间隙中分面和上、下游及栅内的气动参数进行了详细的测量,并与黄洪雁博士对相同叶栅测量的0.023 m间隙尺寸下的实验数据进行了比较。通过对实验结果的分析和讨论,认为叶顶间隙的存在将在涡轮叶栅内引起沿叶高指向上端壁的二次流动,从而改善了下半叶展的流动性能,恶化了上半叶展的流动状态。在较大间隙下泄漏流动更加趋近上端壁,增强了壁面剪切效应,从而使得较大间隙的总压损失大于较小间隙。
In this paper, the aerodynamic parameters of the conventional straight cascade with a tip clearance of 0.036 m on the surface of the low-speed wind tunnel are measured in detail and the aerodynamic parameters of the upstream, downstream and inner cascades are measured and compared with those measured by Dr. Huang Hongyan on the same cascades 0.023 m gap size of the experimental data were compared. Through the analysis and discussion of the experimental results, it is considered that the existence of the tip clearance will cause the secondary flow in the turbine cascade pointing to the upper end wall along the leaf height, thus improving the flowability in the lower half of the blade and worsening the growth of the first half of the blade The flow of state. The leakage flow tends to be closer to the upper end wall under the larger clearance, which enhances the wall shear effect, so that the total pressure loss of the larger clearance is larger than the smaller clearance.