高主流湍流度下大倾角异型气膜孔冷却特性实验研究  

Experimental Study on the Film Cooling Performance of Odd-Shaped Film Holes with Large Inclination Angle under High Turbulence Intensity

作　　者：翟颖妮[1] 刘存良[2] ZHAI Yingni;LIU Cunliang(Department of Mechanical ＆ Electrical Engineering, Xi＇an University of Architecture ＆ Technology, Xi＇an 710055, China;School of Power and Energy, Northwestern Polyteehnical University, Xi＇an 710072, China)

机构地区：[1]西安建筑科技大学机电工程学院,西安710055 [2]西北工业大学动力与能源学院,西安710072

出　　处：《西安交通大学学报》2017年第7期16-23,共8页Journal of Xi'an Jiaotong University

基　　金：陕西省自然科学基础研究计划资助项目(2016JQ5056);国家自然科学基金资助项目(51306152)

摘　　要：为了研究高主流湍流度下大倾斜角异型气膜孔的冷却特性,在主流湍流度为11.82%的流动工况下,采用瞬态液晶传热测量技术对倾斜角均为60°的圆柱孔、水滴孔以及曲面簸箕孔进行了研究。在吹风比为0.5的工况下,3种孔型的气膜贴壁性都较好,上游冷却效率高于下游;在吹风比为1.0的工况下,圆柱孔和水滴孔出现气膜脱离壁面再附着现象,上游冷却效率低于下游;在更大吹风比下,曲面簸箕孔气膜也出现脱离再附着现象。吹风比的增加会显著增强各个气膜孔的对流换热强度,曲面簸箕孔的换热系数比在各个吹风比下都低于圆柱孔和水滴孔,圆柱孔和水滴孔的换热系数比在上游区域较高,而曲面簸箕孔的换热系数比在大吹风比下呈现出先上升后下降的分布特征。实验结果表明,在高主流湍流度条件下,大倾斜角水滴孔和圆柱孔的气膜冷却效果相近,曲面簸箕孔的气膜冷却效果优于这两种孔型。In order to obtain the film cooling characteristics of odd-shaped film holes with large inclination angle under high mainstream turbulence intensity, three film hole configurations with an inclination angle of 60%, including cylindrical hole, water-drop hole and curved dustpan hole, were studied under the mainstream turbulence intensity of 11.82% using transient liquid crystal measurement technique. At a blowing ratio of 0.5, the film attachment behavior on the wall is good for all the three hole configurations, and the film cooling efficiency in upstream region is higher than that in downstream region. At a blowing ratio of 1.0, the film jets lift off from the wall for the cylindrical hole and water-drop hole, resulting in lower film cooling efficiency in upstream region. With further increase of blowing ratio, the film jets of the curved dustpan hole also lift off from the wall. The increase of blowing ratio will obviously enhance the heat transfer intensity for all the three hole configurations. The heat transfer coefficient ratio of the cylindrical hole and water-drop hole decreases gradually along the streamwise direction. And the heat transfer coefficient ratio of the curved dustpan hole is lower than that of the cylindrical hole and water-drop hole under all blowing ratios, and has an undulation feature at large blowing ratios. The above results indicate that the film cooling performance of the curved dustpan hole is better than that of the cylindrical hole and water-drop hole under all blowing ratios, but the film cooling performance of the cylindrical hole and water-drop hole with large inclination angles is close to each other.

关 键 词：气膜冷却 异型气膜孔 高主流湍流度 冷却效率 换热系数比 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]