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The blades of an axial flow turbine have the aerofoil shape...

Also,for the axial flow turbines... Vf1=Vf2

The water strikes the blade surface at the same time from the root to its tip and a stream of water will leave the water at the correspondin trailing edge.

Therefore,for inlet to outlet,the radius and blade velocity will be the same,BUT the blade velocity will be different at different sections of the blade due to variation in the radial distance,which implies that the velocity triangles for each section of the blade will be different.In order to achieve shockless flow,the inlet and outlet triangles of a blade must vary from root to its tip,and therefore,axial flow turbine blades are twisted...

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