带肋横流对凹槽孔气膜冷却特性影响的机理研究  

Mechanism Investigation on Effects of Ribbed Crossflow on Film Cooling Characteristics of Trenched Holes

作　　者：邓贺方 杨晶晶 姜玉廷[1] 郑群[1] 陆松兵 房一博 DENG He-fang;YANG Jing-jing;JIANG Yu-ting;ZHENG Qun;LU Song-bing;FANG Yi-bo(College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001 [2]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《推进技术》2022年第3期306-316,共11页Journal of Propulsion Technology

基　　金：国家自然科学基金(51809065);黑龙江省自然科学基金(QC2017047)。

摘　　要：为了探究带肋横流对凹槽孔气膜冷却特性的影响,运用Realizable k-ε湍流模型,对光滑通道、45°肋通道和135°肋通道进气的凹槽孔进行了数值研究,吹风比为0.5、1.0和2.0,主流和横流的进口雷诺数分别为1×10^(4)和1×10^(5)。结果表明:45°肋通道与光滑通道在气膜孔内具有相似的螺旋流动,但其流量系数相比光滑通道降低了9.2%~43.6%,而135°肋通道气膜孔内的流动以直线流动为主,其流量系数最高。受横流影响,三种通道的气膜冷却效率分布都不均。在吹风比为0.5和1.0时,45°肋通道的气膜冷却效率要比光滑通道的分别低11.2%和3.6%,135°肋通道的则要比光滑通道的高65%和44.6%。吹风比为2.0时,三种通道的气膜冷却效率相差不大。此外,45°肋通道的换热系数要比光滑通道的高1.5%~8%,而135°肋通道的换热系数要比光滑通道的低0.9%~3%。In order to investigate the effects of ribbed crossflow on film cooling characteristics of trenched holes,the trenched holes fed coolant by smooth channel,45°ribbed channel and 135°ribbed channel are numerically investigated using realizable kεturbulence model.The blowing ratio is fixed at 0.5,1.0 and 2.0.The inle Reynold number of mainstream and crossflow is 1×10^(4)and 1×10^(5),respectively.The results show that the 45°rib case has a similar helical motion to the smooth case in film hole,but the discharge coefficient of the 45°rib case is lower 9.2%~43.6%than that of the smooth case.For the 135°rib case,the flow structure in film hole is mainly straight motion and the discharge coefficient is the highest.Because of the crossflow,the distributions of film cooling effectiveness are asymmetrical for the three cases.When the blowing ratio is 0.5 and 1.0,the film cooling effectiveness of the 45°rib case is lower 11.2%and 3.6%and that of the 135°rib case is higher 65%and 44.6%than the smooth case.When the blowing ratio is 2.0,the film cooling effectiveness of the three cases has little difference.In addition,the heat transfer ratio of the 45°rib case is higher 1.5%~8%and that of the 135°rib case is lower 0.9%~3%than the smooth case.

关 键 词：带肋横流 气膜冷却 凹槽孔 气膜冷却效率 换热系数比 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]