Fluid reaction surfaces (i.e. – impellers) – With means positioning fluid current driven impeller... – Feathering cycle related to flow direction
Patent
1984-01-09
1988-08-16
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With means positioning fluid current driven impeller...
Feathering cycle related to flow direction
416119, 416236A, F03D 706
Patent
active
047640901
ABSTRACT:
A cross wind axis type wind turbine includes four wind driven airfoil blades pivotally connected between upper and lower sets of support spokes supported on a rotating vertical column so that the blades are upwardly inclined towards the column axis to produce an accelerated downwardly swirling air flow in the turbine interior. The lower spokes are airfoil shaped to draw wind into the turbine to further accelerate the air flow in the turbine for improved blade efficiency. A feedback control arrangement responsive to changes in wind speed or direction adjusts the blade angles to the wind for optimum efficiency by virtue of a rack and pinion assembly connecting each blade to a center plate through connecting rods extending radially through each upper spoke. The center plate is mounted within the column on a control shaft that includes an offset portion that pivots during blade rotation about the column, or when rotated by a wind vane, to vary the radial positions of the plate and thereby the blades through the rack connections. Alternatively, a pair of weights radially movable within the lower spokes by centrific force in response to variations in wind velocity can be connected to pivot the control shaft to adjust the blade angles. Each blade includes a series of troughs formed equispaced to each other along the blade length that are respectively tapered towards the leading edge to cause wind entering the troughs to diverge and decelerate for maximum wind energy transfer to the blades.
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Powell Jr. Everette A.
Wind Feather, United Science ASC
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