Analysis of secondary flow structures of compressor cascade with different fences

The sketches of secondary flow structure in compressor cascade with endwall fences, blade fences and combined fences were presented. By blocking crosswise flow and spanwise flow respectively, the secondary flow status was controlled by the endwall fences and blade fences, resulting in reduced total loss of cascade. Both the cascade secondary flow characteristics with endwall fence and blade fence were embodied in the cascade flow with combined fences. Meanwhile, optimal combined fences was not the simple combination of optimal endwall fence and optimal blade fence. A more detailed optimization process was required. While different fences improved cascade flow status, the endwall fence vortices, blade fence vortices and other vortices were formed and developed, making the vortex structure more complicated.