To research the effects of tube-baffle composite vortex reducer on drag reduction performance of radial internal flow in co-rotating disc cavity

numerical simulation was carried out to calculate the de-rotating system with varied structure of tube-baffle composite vortex reducer under different rotating speeds. The flow structure

total pressure loss and distribution curve of total pressure loss along the way under varied conditions were obtained. The results showed that the total pressure loss in the disk cavity of the tube-baffle composite vortex reducer can be obviously reduced with respect to the basic tube vortex reducer. The drag reduction effect of the upstream installation partition of the tube vortex reducer was better than that of the downstream installation of the disc cavity. There existed optimal dimensionless baffle length of 0118 and 0065 for upstream and downstream baffles. Compared with the basic model

the optimal drag reduction effect increased by 17% and 5%

respectively. And at the optimum baffle length

the drag reduction effect of the upstream and downstream baffles installed at the same time was 19% higher than the basic model.