Abstract
The new type of diffuser augmented wind turbine (DAWT) called "wind-lens turbine" has been developed. The wind-lens turbine has a diffuser with brim called "wind-lens", by which the wind concentration on the turbine rotor and the significant enhancement of the turbine output can be achieved. A wind-lens turbine which has the higher output power coefficient than the Betz limit and other DAWTs has been developed. The reasons that the wind-lens turbine achieved higher output power coefficient than those of others are the wind-lens turbine was designed with the appropriately estimated wind velocity at the rotor inlet and the optimization method has been applied to the aerodynamic design of the wind-lens turbine.
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