摘要
为了探讨冷热流体真实温比与小温比的气膜冷却特性差别,采用湍流模型及Fluent软件,对吹风比Br分别为0.5和2.0,温比Tr分别为1.1和2.0的双向扩张孔射流气膜的流场、温度场和冷却效率分布进行研究。结果表明：Br=0.5时,2种温比下的冷气扩散基本一致,径向平均冷却效率差别不大;Br=2.0时,Tr=2.0的冷气径向扩散优于Tr=1.1的,径向平均冷却效率较Tr=1.1时增幅13.4%-55.5%。
To explore the difference of film cooling characteristics between small temperature ratio and real temperature ratio of the coolant and gas, the flow field, temperature field and film cooling efficiency of 3-in-1 hole injection film were studied,on the basis of Fluent software, by using the realizable κ-ε model with temperature ratio of 1.1 and 2.0,the blowing ratio of 0.5 and 2.0. The results show that,at blowing ratio of 0.5,the diffusions of coolant with both temperature ratios are identical and the radial average cooling efficiency has little difference. At blowing ratio of 2.0,the coolant radial diffusion with temperature ra- tio of 2.0 is better than that with temperature ratio of 1.1. The radial average cooling efficiency with tem- perature ratio of 2.0 is about 13.4% to 55.5% higher.
出处
《热力发电》
北大核心
2015年第4期50-55,共6页
Thermal Power Generation
基金
国家自然科学基金项目(51306126)
关键词
气膜冷却
双向扩张孔
吹风比
温比
冷却效率
流场
温度场
径向扩散
film cooling, 3-in-1 hole, blowing ratio, temperature ratio, cooling efficiency, flow field, temperature field, radial diffusion
作者简介
李广超（1979-），男，博士，副教授，主要研究方向为燃气轮机气动热力学。E-mail：ligc706@163．com
