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为了研究不同叶片尾缘结构对冷却效果的影响规律,设计了3种尾缘结构,并搭建了试验台,采用红外热像仪对叶片尾缘的绝热壁温进行测量。研究结果表明:(1)3种尾缘结构的冷却效率沿壁面的分布有很大差异,针对试验件Ⅰ,冷却效率存在最大值,且最大值出现的位置随着吹风比的增加而逐渐远离气膜出口;(2)试验件Ⅱ和Ⅲ的冷却效率沿壁面均呈现逐渐降低的趋势,但降低的规律二者又不相同;(3)在相同壁面位置,试验件Ⅲ的冷却效率最高,试验件Ⅰ的冷却效率最低,因此可以认为,试验件Ⅲ所示的尾缘结构更有利于对叶片尾缘的冷却。
In order to study the influence law of different blade trailing edge structures on the cooling effect, three kinds of trailing edge structures were designed and the test bench was set up. The thermal insulation wall temperature at the trailing edge of the blade was measured by infrared thermal imager. The results show that: (1) The cooling efficiency of the three kinds of trailing edge structures varies greatly along the wall surface. For the test piece Ⅰ, the cooling efficiency has the maximum value, and the location of the maximum value gradually decreases as the blowing ratio increases (2) The cooling efficiency of the test pieces Ⅱ and Ⅲ showed a trend of decreasing gradually along the wall, but the law of reducing was different; (3) The cooling efficiency of the test piece Ⅲ was the highest at the same wall position, The cooling efficiency of the test piece I was the lowest, so it can be assumed that the tail end structure shown in the test piece III is more conducive to the cooling of the trailing edge of the blade.