If the above checks out, I would look at velocity vector plots from 10%, 50%, and 90% blade span in CFD-Post. An easy way to do this is create isosurfaces of radius at the appropriate locations and plot vectors on these surfaces. Do the resulting velocity triangles at blade leading edge/trailing edge agree with your design calculations? Is the leading edge flow incidence as expected? Is there flow separation on the blades that's resulting in the reduced power output?
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