The design of these wind turbines are highly economical and price efficient and achieves a 2.5 higher yield than conventional 3-blade wind turbines!
While the basic technical principle of the contained wind turbine system as used by the manufacturer WindTec Systems AG is not new, it has, however, not been used in the industry in the past due to a trend towards large, free- running wind generators and the structural complexity of the diffuser in such large systems was a significant problem. They have now solved the problems of constructing diffusers for the targeted market of small to mid-size systems.
The substantial increase of output power of the windpower turbine compared to a free-running propeller results mainly from the fact, tat the diffuser, which has an airfoil shape with a Flower-flap ring added to its trailing edge, does accelerate wind flowing through and around it in the area, where the rotor is located. In addition to this, there is only a very small gap between rotor and the fixed diffuser, so that wind energy cannot “escape” the rotor, hence increasing its effective area.
Wind Channel Test at 50 m/s (180 km/h)