【摘要】 对不同吹风比条件下的典型单排孔冷却结构的平板气膜冷却特性进行了实验研究,对冷却孔下游的气膜冷却效率及换热系数分布规律进行了分析。实验在3个吹风比条件下进行,分别为0.5,1.0,1.5。实验中冷却孔直径的雷诺数ReD=13600。射流、主流的密度比通过温度控制保持在0.88。实验中采用热敏液晶技术用以获取冷却孔下游整个温度场分布信息,通过对实验数据进行分析,在吹风比0.5条件下冷却孔下游Y<10区域取得最优冷却效果;吹风比1.0条件下的冷却效果优于吹风比1.5条件下的冷却效果。气膜冷却条件下的换热系数分布和其对应的冷却效率分布基本相同。更多还原

【Abstract】 This paper reports the current studies on the film cooling characteristics of single-row holes on flat plate at different blowing ratios,and analyzes the distributions of adiabatic film cooling effectiveness and heat transfer coefficient downstream the film holes.The research is conducted at three blowing ratios,0.5,1.0 and 1.5,respectively.The Reynolds Number based on the film hole diameter ReD is 13600.The density ratio of the injection flow and the mainstream is maintained at 0.88 by controlling the temperature of the injection flow.The liquid crystal thermography is used to acquire the temperature distribution of the entire plate surface downstream the film holes.t.According to the experimental results,the best cooling effect is achieved at a blowing ratio M=0.5 in the region of Y<10.The cooling effect at the blowing ratio M=1.0 is better than that at M=1.5.The heat transfer coefficient distribution downstream the film holes is similar to that of the adiabatic effectiveness at the same experimental conditions.更多还原