Experimental study effect of flange addition on mechanical power of diffuser augmented counter rotating wind turbine

On this paper addition of flange on diffuser augmented counter rotating wind turbine is investigated. The addition of flanged is expected increasing velocity of air that flow inside the diffuser so turbine can converse more power from the wind. There are 3 sample of flange with different outer diameter to be tested on dual rotor wind turbine which rotor counter rotating to the outer with 3 different flow velocity. The experimental result shows that addition of flange improve the mechanical power of diffuser augmented counter rotating wind turbine and the larger outer diameter made a better improvement than the smaller one in almost all flow velocity on this experiment. The improvement is up to 112% compare to the one without flange.