Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Patent
1986-02-04
1987-10-06
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
416132B, F03D 106
Patent
active
046979883
ABSTRACT:
The flat-plate type wind turbine rotor blade comprises a rigid spoke having a single thin flexiblie skin associated therewith. The skin is formed to provide a delta-wing and a flap extension. The delta-wing and the flap extension are angularly disposed at about 25.degree. to each other. The spoke lies along the junction of the delta-wing and the flap extension. A substantially rigid peripheral member extends along the margin of the skin. The peripheral member and the spoke are joined to provide a frame to which the skin is secured. Arrays of parallel reinforcing rib members extend between the spoke and the peripheral member. These rib members are mounted on the pressure surface of the skin. The ribs on the delta-wing are positioned at an angle of about 60.degree. from the axis of the spoke; the ribs on the flap extension are positioned at an angle of about 75.degree. from said axis. They therefore coincide with the main flow paths of the air flow over the blade surface.
The blade is reduced in weight and cost relative to a conventional double-walled blade or a single skin blade of a thickness sufficient to eliminate the need for reinforcing members.
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Kentfield John A. C.
MacGregor Ian
Her Majesty the Queen in right of Canada as represented by the
Johnson Ernest P.
Powell Jr. Everette A.
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