An Numerical Study On Heat Transfer And Flow Characteristic Of Internal Cooling Channel With New Dimple Vortex Generator

Dimple vortex generator cooling technology is an enhanced heattransfer technology based on vortex swirl method. Compared with otherheat transfer enhancement techniques, it shows itself by the obviousadvantages of good heat transfer performance and smaller flow resistance.With the continuous improvement of modern gas turbine blade operatingtemperatures, engineers and scientists all over the world devote themselvesto the journey of searching for a heat transfer structure with properties ofboth excellent heat transfer performance and less flow resistance. For thisreason, the research constructed and studied two groups of four new dimplevortex generator structures and detailed numerical simulation usingReynolds averaging method is taken to do the research. The heat transferenhancement, flow resistance and total heat transfer parameters of differentdimple vortex generators are carefully compared and analyzed to identifythe dimple vortex generator with most excellent heat transfer ability andflow ability. Meanwhile, the high-precision numerical simulation usingdetach eddy simulation method is engaged to analysis mechanism of heattransfer enhancement and lower flow resistance.The results shows that: on the Reynolds number range of8,500-50,500,the first kind of dimple vortex generator with rounded edges shows bettercomprehensive heat transfer performance: the dimple vortex generator withonly former rounded edge show both better thermal performance and flowperformance and the dimple vortex generator with all edges rounded showsthe best overall heat transfer performance. The second kind of dimple vortexgenerator with added tiny V fin can greatly improve the heat transferperformance but with too much pressure loss. And the detach eddysimulation of preferred dimple vortex generator indicate that the tinyrounding structures affect the heat transfer ability, flow resistance ability of the cooling channel and the vortex structure of vortex swirl can be differentdue to the rounding edge at high Reynolds number.