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首页> 外文期刊>International Journal of Heat and Mass Transfer >Film cooling performance of converging slot-hole rows on a gas turbine blade
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Film cooling performance of converging slot-hole rows on a gas turbine blade

机译：燃气轮机叶片上会聚槽孔行的薄膜冷却性能

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摘要

Experimental tests have been performed to investigate the film cooling performance of converging slot-hole (console) rows on the turbine blade. Film cooling effectiveness of each single hole row is measured under three momentum flux ratios based on the wide-band liquid crystal technique. Measurements of the cooling effectiveness with all the hole rows open are also carried out under two coolant-mainstream flux ratios. Film cooling effectiveness of cylindrical hole rows on the same blade model is measured as a comparison. The results reveal that the trace of jets from both consoles and cylindrical holes is converging on the suction surface and expanding on the pressure surface by the influence of the passage vortex, while the influence of passage vortex on the jets from consoles is weaker. The film coverage area and the film cooling effectiveness of single/multiple console row(s) are much larger than those of single/multiple cylindrical hole row(s). When the console row is discrete and the diffusion angle of the console is not very large, the adjacent jets cannot connect immediately after ejecting out of the holes and the cooling effectiveness in the region between adjacent holes is relatively lower. On the pressure surface, the film cooling effectiveness of console rows increases notably with the increasing of momentum flux ratio or coolant-mainstream flux ratio. But on the suction side, the increase in cooling effectiveness is not very notable for console row film cooling as the coolant flux increases. Moreover, for the film cooling of single console row at the gill region of the suction surface, the jets could lift off from the blade surface because of the convex geometry of the suction surface.
机译：已经进行了实验测试以研究涡轮叶片上会聚的槽孔（控制台）行的薄膜冷却性能。基于宽带液晶技术，在三个动量通量比下测量每个单孔行的薄膜冷却效率。在所有孔排都打开的情况下，还可以在两个冷却剂-主流通量比下进行冷却效率的测量。作为比较，测量了在同一叶片模型上的圆柱孔行的薄膜冷却效率。结果表明，通过通道涡流的影响，来自控制台和圆柱孔的射流的痕迹在吸力面上会聚，并在压力表面上扩展，而通道涡流对来自控制台的射流的影响则较弱。单排/多排控制台孔的薄膜覆盖面积和薄膜冷却效率远大于单排/多排圆柱形孔排的薄膜覆盖面积和薄膜冷却效率。当控制台排是离散的并且控制台的扩散角不是很大时，相邻的喷嘴在从孔中喷出后不能立即连接，并且相邻孔之间的区域中的冷却效率相对较低。在压力面上，随着动量通量比或冷却剂-主流通量比的增加，控制台排的薄膜冷却效率显着提高。但是在吸入侧，随着冷却剂通量的增加，冷却效率的提高对于控制台行薄膜冷却不是很明显。而且，对于在吸气表面的刺区域处的单个控制台排的膜冷却，由于吸气表面的凸出的几何形状，射流可从叶片表面升起。

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