几何结构对后台阶缝隙气膜冷却效率的影响

推进技术 ›› 2006, Vol. 27 ›› Issue (4): 312-315.

几何结构对后台阶缝隙气膜冷却效率的影响

朱惠人,原和朋,周志强,许都纯

西北工业大学动力与能源学院陕西西安710072;西北工业大学动力与能源学院陕西西安710072;西北工业大学动力与能源学院陕西西安710072;西北工业大学动力与能源学院陕西西安710072

发布日期:2021-08-15

Effect of geometry of back-step slots on film cooling

School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China;School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China;School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China;School of Power and Energy,Northwestern Polytechnical Univ.,Xi’an 710072,China

Published:2021-08-15

摘要/Abstract

摘要： 针对涡轮叶片尾缘冷却结构特点,建立了后台阶三维缝隙结构气膜冷却特性试验台,测量了缝隙中心和肋中心下游气膜冷却效率的局部分布,研究了不同几何结构的影响,其中缝宽-肋宽比的变化参数是0.67,1.0及1.5,唇厚-缝高比的变化参数是0.5,1.0及1.89。试验结果表明:(1)缝隙中心下游的冷却效率沿流向呈逐渐下降趋势,肋中心下游的冷却效率呈先增加后下降的趋势;(2)缝宽-肋宽比对下游冷却效率有较大的影响,缝宽-肋宽比越大,冷却效率越高;(3)唇厚-缝高比增加时,缝隙下游的冷却效率呈增加趋势;肋后冷却效率随唇厚-缝高比增加在x/H<4的区域呈减小趋势,在x/H>4的区域呈增大趋势;(4)三维掺混区随着缝宽-肋宽比的减小呈减小趋势,随唇厚-缝高比越大,成增大趋势。

关键词: 涡轮叶片;三维缝隙~+;薄膜冷却;掺混流~+

Abstract: Film cooling effectiveness of back-step three dimensional slots injection,which modeling the trailing edge cooling of turbine blade,was measured at the slot center line and rib center line.The effects of geometry of slot on film cooling effectiveness were studied.The ratio of slot width to rib width changed from 0.67 to 1.5 and ratio of lip height to slot height changed from 0.5 to 1.89.The experimental results show that the profile of film cooling effectiveness is different at the slot center line and rib center line. Both ratios of slot width to rib width and lip height to slot height have evident influence on the film cooling effectiveness.The sizes of three dimensional mixing flow region increases with the increase of both ratio of slot width to rib width and lip height to slot height.

Key words: Turbine blade;Trailing edge slot~+;Film cooling,Mixing flow~+

朱惠人,原和朋,周志强,许都纯. 几何结构对后台阶缝隙气膜冷却效率的影响[J]. 推进技术, 2006, 27(4): 312-315.