旋转方位角对斜肋通道内部流动与换热的影响

数值模拟了静止及旋转状态下径向出流60°斜肋通道的内流动与换热分布,研究了3种旋转方位角:0°,-45°及+45°.分析了哥氏力与肋片对旋转通道内流及换热的耦合作用机理.计算结果表明:旋转方位角对通道的内流与换热影响显著.在0°旋转方位角下,通道前后缘的换热差异最大;在-45°方位角下,通道整体换热性能最差;在+45°方位角下,通道具有最佳的整体换热性能.

Effects of channel orientation on fluid flow and heat transfer in a channel with angled ribs

Numerical simulations of turbulent flow and heat transfer in a rotating radial outward flow passage with 60° ribs were performed. Three channel orientations were studied, that is, 0°,-45° and +45°. Effects of Coriolis and rib induced secondary flows were analyzed with the three dimensional simulations and the following conclusions were drawn: the combined effects of Coriolis and rib induced secondary flows largely depend on channel orientation. The 0° channel orientation produces largest heat transfer variation between leading and trailing edges, the -45° channel orientation gives the lowest overall heat transfer augmentation, while the +45° channel orientation has the highest overall heat transfer enhancement.