摘要
采用传热传质类比的方法研究主射流密度差和速度比对单排孔平板气膜冷却效率的影响.密度比为1时射流为空气,密度比为1.5和2.0射流为异质气体,射流与主流的夹角为35°,孔间距为3倍的气膜孔直径.结果表明:当速度比较小时,射流在被保护壁面上的铺展由扩散控制;当速度比较大时,铺展由对流控制.在较低速度比条件下,随着吹风比的增大,横向和纵向的铺展都增加,有效保护范围面积增加;高速度比条件下,射流的再附点随着动量比的增大而更向下游.
An investigation was conducted to explore the influence of density ratio and velocity ratio of mainstream/injectant upon the cooling effect of flat plane film using heatmass transfer analogy. The injectant is air in the case of density ratio of 1.0 ,or heterogeneous gas in the case of density ratio of 1.5 and 2.0. The inclined angle between injectant and mainstream is 35° and the hole spacing is 3 times film hole diameter. The results indicate that,the spreading of injectant is controlled through the protected wall surface for a low velocity ratio,and controlled by convection for a high velocity ratio. With the increase of mass flux ratio, the transverse and longitudinal spreading could be expanded, thus increasing effectively the protective range;the reattachment point will move towards the downstream with the increase of momentum ratio under high velocity ratio.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2007年第9期1430-1434,共5页
Journal of Aerospace Power
关键词
航空、航天推进系统
气膜冷却
传热传质类比
绝热温比
aerospace propulsion system
film cooling
heat-mass transfer analogy
adiabatic film effectiveness
作者简介
李丽（1978-）,女,河南汝南人,博士生,主要从事高效冷却方式的换热研究.
