Performance and wake of a Savonius vertical‐axis wind turbine under different incoming conditions

When blades are feathered, tower drag vouches for about 90% of the total aerodynamic drag on the turbine; while the drag on the blades begin to dominate as one or three blades

For a given environmental condition and wave misalignment, when the turbine is normal feathered (fault type 0), the wind-induced yaw responses are affected by the change of blade