摘要
对带有凹坑和凸包的内流通道在不同旋转数下的对流换热特性进行了数值分析,探讨了Coriolis力对通道中流场和换热特征的影响.研究发现,随着旋转数增加,通道前缘呈现出较弱的流动冲击,但存在较大的尾迹和延迟的流动再附着,后缘凹坑内部有一较小旋涡和较强射流使得后缘传热得到强化,最高可达60%.总体Nusselt数随着旋转数的增加先减小而后增大.
The convective heat transfer performance of internal cooling passage with hemi- spherical dimples or protrusions was numerically studied and the influence of Coriolis force on heat transfer characteristics in the channel flow was explored. It is found that: the leading edge of the channel shows weak flow impact with the increase of the rotation number, but there is a big wake and delayed flow reattachment; a smaller vortex and stronger jet exist in the dimple of the trailing edge, which make the heat transfer augmentation up to a maximum of 50%. With the increase of the rotation number, the overall Nnsselt number decreases firstly and then in- creases.
出处
《应用数学和力学》
CSCD
北大核心
2013年第9期965-975,共11页
Applied Mathematics and Mechanics
基金
中央高校基本科研业务费专项资金资助课题(27R1204026A)
关键词
燃气轮机
凹坑
凸包
旋转
强化传热
gas turbine
dimple
protrusion
rotation
heat transfer enhancement