Multi-objective analysis of the turbine blade internal cooling channel with discontinuous bionic S-shaped ribs

Abstract

Through numerical simulation and experimental verification, the flow and heat transfer characteristics of different discontinuous bionic S-shaped ribs in cooling channels were studied. The influence mechanism of different discontinuous locations, discontinuous sizes, and discontinuous numbers coupling design on the channel performance is investigated in depth. The study demonstrates that the discontinuous design can significantly enhance flow field disturbance in the discontinuous region of the S-shaped rib, thereby substantially improving channel heat transfer. Channel heat transfer changes with the discontinuity location, exhibiting a trend similar to the cosine function. The channel heat transfer has different trends with the change of the discontinuity size under different discontinuity locations. Obtained by coupling the discontinuous size of 2P/10 with the discontinuous location of 6P/10 single discontinuous S-shaped rib heat transfer is the best, and the ribbed wall Nu/Nu0 is approximately 35 % higher than the continuous rib. The greatest thermal performance, which is 39 % higher than continuous ribs, is achieved by single discontinuous S-shaped ribs with discontinuous size and discontinuous location of 5P/10 and 9P/10, respectively. The decreased distance between discontinuities in double discontinuous S-shaped ribs leads to the flow field disturbance coupling effects of adjacent discontinuities, which further enhances the disturbance and improves heat transfer.