截断肋排布方式对内冷通道换热性能的影响

Experimental studies are carried out to investigate the heat transfer performance of six different arrangements of truncated ribs in internal cooling channel by fixing the Reynolds number. The convective heat transfer mechanisms of the considered cases are detailed and analyzed based on the fluid flow characteristics by using three dimensional numerical simulations. The results show that among six different arrangements of truncated ribs, Case 2-3-5-9 possesses the best heat transfer performance while Case 2-5-3-9 has the worst heat transfer performance. However, the pressure drop for Case 2-3-5-9 is the largest while it is the lowest for Case 2-5-9-3. In terms of overall thermal performance, Case 2-9-5-3 performs the best, followed by Case 2-3-5-9, and Case 2-5-3-9 performs the worst. Through analyzing the flow characteristics of different cases, it is found that the transverse vortices induced by the truncated regions in the truncated ribbed channel can result in strong flow mixing between the mainstream and boundary flow, which can enhance the heat transfer performance in the channel. In addition, different arrangements of truncated ribs lead to different flow characteristics in the internal cooling channels, but the vortices induced by the truncated regions look similar.