温比对双向扩张孔射流气膜冷却效率的影响  

Influence of temperature ratio on cooling efficiency of 3-in-1 hole injection film

作　　者：李广超[1] 付建[1] 刘永泉[2] 杜治能[2] 张魏[1] 

机构地区：[1]沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室,辽宁沈阳110136 [2]中国航空工业集团公司沈阳发动机设计研究所,辽宁沈阳110015

出　　处：《热力发电》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)

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.

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 

分 类 号：TK479[动力工程及工程热物理—动力机械及工程]