分腔流量比对涡轮曲端壁表面冷却特性实验

利用高速风洞及压敏漆（PSP）技术，研究了端壁表面不同分腔流量比对端壁表面的气膜冷却效率的影响。对比各个分腔在不同流量比下端壁表面的气膜冷却效率的详细分布发现：端壁表面的气膜冷却效率随着槽缝流（分腔1）流量比的增加而增大，随着槽缝喷射冷气流量的增加，冷气在端壁表面的覆盖范围变广，同时冷却效果也有所提升；随着端壁前部分腔（分腔2）冷气流量比的增加，叶栅通道喉部上游区域的冷却流体会出现明显的吹离壁面的情况，端壁表面的气膜冷却效率也会随之减小；端壁后部分腔（分腔3）冷气流量比对端壁表面的冷却效率的影响与分腔2类似。

Effect of mass flow ratios on film cooling characteristics of endwall: Experimental study

The effect of mass flow ratios different on the film cooling effectiveness of the enwall is studied using the Pressure-Sensitive Paint (PSP) technology and high-speed wind tunnel. The detailed distribution of the film cooling effectiveness on the endwall surface under different flow ratios of each cavity is obtained. The film cooling effectiveness on the endwall surface increases with the increase of the slot mass flow ratio. As the coolant injected into the slot increases, the coverage of the coolant on endwall surface becomes, cooling performance. As the coolant mass flow ratio of 2 increases, because the coolant from cooling holes liftoff from the wall surface to the excessively high speed. The influence of the mass flow ratio cavity 3 on the cooling effectiveness of the endwall is similar to that of cavity 2.