Patent ID: 7256512
Filing Date: 2007-08-14
Classification: F03D,F05B,Y02B,Y02E,Y10S

Abstract:
1. A Ducted Fan Wind Turbine, hereinafter and before, DFWT, device for safely and quietly producing electrical power without added induced mechanical vibration from an air molecule mass/velocity throughput, standing alone in a field or in multiple DFWT devices in the field combinations: and most especially to be mounted on turbulent, windy, building tops, with augmented increased wind input stream flows measurably typical of the tops of buildings and other structures, comprising, in combination: a turbine type, dynamically mass balanced multi-bladed fan located with an aerodynamically regular and balanced duct, said duct configured as a regular four solid sided short square, open to the front and the back through a very highly air molecule porous metal or other relatively permanent, strong mesh to prevent the ingress or egress of objects of any size and type into or out of the fan power cell, with four externally affixed and mounted flap structures, hinged to each other in such a way that the front aerodynamically leading edges of the flap structures and the aerodynamic leading edges of the four sided centrally located fan power cell are hinge attached to each other and coincident; means in each said DFWT device to alter the exit aperture air molecule volume, or equivalent cross-sectional exit aperture of said DFWT device, via the expedient of extensible electrical or other operational linear actuators, by which the planar surface of said flaps may be extended further away from or nearer to the solid planar sides of said central power fan square, so that the ratio of the duct entrance cross-sectional area, to the duct exit cross-sectional area may be varied to achieve the highest possible fan rotational velocity; a voltage is sensed via a voltage/velocity electrical signal derived from an integrated fan shaft mounted N-I-B generator electrically transmitted to a logic controlled power amplifier comparator from which electrically controlled linear flap actuators are powered.