摘要
采用瞬态液晶测量技术测量了圆柱形孔的冷却特性分布,研究了动量比的影响.结果表明:大动量比下,射流脱离壁面后重新贴回壁面,冷却效率沿流向率逐渐升高,且下游孔间区域的冷却效率较高;小动量比的冷却效率分布规律与此相反.动量比越大,换热增强效果越显著;在上游区域,大动量比射流诱导出的回流涡形成了一个局部强换热区;在下游区域,各个动量比的传热系数比分布比较相似,两孔中间区域的换热强于孔中心线附近区域.
Film cooling characteristics of cylindrical hole were measured using a transient liquid crystal measurement technique which can process nonuniform initial temperature.The influence of momentum flux ratio was tested.The results show that jets of large momentum ratio lift off from the wall after ejecting out and the cooling effectiveness in the upstream is very low.However,the area covered by jet and the effectiveness increase streamwise because the jets reattach the wall after lifting off,and moreover the co...
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2009年第9期1959-1965,共7页
Journal of Aerospace Power
基金
国家973基金(2007CB707701)
关键词
气膜冷却
全表面测量
液晶
冷却效率
传热系数
film cooling
full-surface measurement
liquid crystal
film cooling effectiveness
heat transfer coefficient
