改进姊妹孔气膜冷却效率数值模拟  

Numerical Simulation on the Film Cooling Effectiveness with Injection from Improved Sister Holes

作　　者：皮骏 贺嘉诚 刘光才 李章萍[3] PI Jun;HE Jia-cheng;LIU Guang-cai;LI Zhang-ping(Institute of General Aviation,Civil Aviation University of China,Tianjin 300300,China;School of Aeronautical Enginee-ring,Civil Aviation University of China,Tianjin 300300,China;College of Economics and Business administration,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学,通用航空学院,天津300300 [2]中国民航大学,航空工程学院,天津300300 [3]中国民航大学,经济与管理学院,天津300300

出　　处：《机械设计与制造》2020年第11期284-288,共5页Machinery Design & Manufacture

基　　金：中央高校基本科研业务费项目中国民航大学专项资助(3122017056)。

摘　　要：针对改进姊妹孔在吹风比为0.5、1.0、1.5、2.0情况下的温度场、流场以及冷却效率分布作了数值研究,模拟结果与圆柱孔和传统姊妹孔进行了分析比较。结果表明:与圆柱孔和传统姊妹孔相比,改进姊妹孔形成了附加漩涡对,与反向漩涡对相互作用,抑制了冷却气流被反向漩涡对的抬升并且增强了冷却气流的扩散,提高了冷却气流的贴壁性,增大了冷却气流的展向扩展范围;与传统姊妹孔相比,在低吹风比条件下,改进姊妹孔提高了气膜冷却效率约(10~20)%,在高吹风比条件下,改进姊妹孔提高了气膜冷却效率约(20~35)%。Numerical simulation is carried out to evaluate the film cooling effectiveness and to investigate the change of the flow field of cylindrical hole,traditional sister holes and improved sister holes at blowing ratios of 0.5,1.0,1.5 and 2.0.Results show that an additional vortex pair is produced by the improved sister holes,which is mutual effected with an anti-kidney vortex pair.This phenomenon weakens the lifting of coolant and increases the coverage of coolant,so as to maintain the flow adhesion of coolant and improve the transverse distribution of coolant compared with the cylindrical hole and the traditional sister holes.Compared with the traditional sister holes,the film cooling effectiveness of improved sister holes is increased about 10%to 20%at the low blowing ratios and 20%to 35%at the high blowing ratios.

关 键 词：气膜冷却 姊妹孔 冷却效率 数值模拟 吹风比 传热性能 

分 类 号：TH16[机械工程—机械制造及自动化] V233.5[航空宇航科学与技术—航空宇航推进理论与工程]