摘要
采用热色液晶瞬态测温技术对航空发动机进气道支板的带凹坑壁面通道内表面开展冲击换热实验。研究了不同射流角度和射流雷诺数下通道内表面的换热特征。结果表明:沿流向在出气缝附近形成换热的高值区,在凹坑尾缘形成局部的高值区。凹坑壁面的换热要强于光滑壁面。随着射流雷诺数的增加,平均努塞尔数增大。当射流倾斜入射时,被冲击一侧换热较高,在驻点区域以及凹坑的尾缘换热最强,另一侧内壁面换热相对弱。射流角度30°时,被冲击面的换热最显著。在射流角度15°时,前缘附近的换热效果最强。
An impingement heat transfer experiment was carried out in a dimpled wall channel of aeroengine inlet strut using transient thermochromic liquid crystal measurement technique. The effects of jet Reynolds number and jet angles on heat transfer distribution have been investigated. The results show that heat transfer is very high around the outlet slot along flow direction and on the trailing edge of the dimple. The heat transfer of dimpled wall is stronger than that of smooth wall. The average Nusselt number increases with the increasing of jet Reynolds number. At inclined inlet jet conditions, the heat transfer value in impacted wall is higher than the other side, and the highest value is obtained in stagnation region and trailing edge of the dimple. The inlet jet with 30° provides the strongest heat transfer performance while heat transfer near leading edge is the strongest at 15°conditions of all experiment angles.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第12期2638-2644,共7页
Journal of Engineering Thermophysics
关键词
射流冲击
凹坑
强化换热
液晶
jets impingement
dimple
heat transfer enhancement
liquid crystal
