Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Patent
1980-12-23
1983-10-11
Hornsby, Harvey C.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
416226, 416235, F03D 106
Patent
active
044089589
ABSTRACT:
A wind turbine blade of large size for a wind turbine (14) having three blades (16) and used to generate electrical power is contoured to minimize stalling and to provide unusually good efficiency. The cross section of the blade tapers from a configuration at the hub or inboard end with substantial leading and trailing edge deflection toward the wind providing high lift at low speed, to the outboard one-fourth to one-fifth which is configured as a conventional low lift airfoil since it moves through the air at comparatively high speed. The chord length of approximately the inboard one-third of the blade is chosen such that, in combination with the deflection, very little air is permitted to cross this inboard part of the blade but is forced to flow radially outwardly such that by reason of an increase in dynamic pressure it augments the flow across the faster moving part of the blade. The blade may be formed of a single long tapered spar (34) having great strength which is fastened to the hub with a plurality of ribs (a-i) attached perpendicularly to the spar to define the desired cross-sectional configurations, this assembly being covered with a suitable skin such as a glass epoxy cloth.
REFERENCES:
patent: 1353710 (1920-09-01), Baumann
patent: 1838453 (1931-12-01), Rosen
patent: 1853607 (1932-04-01), Ferreby
patent: 1910520 (1933-05-01), De la Cierva
patent: 2746672 (1956-05-01), Doll, Jr. et al.
Hornsby Harvey C.
Peterson Christine A.
Smith Robert C.
The Bendix Corporation
Thornton W. F.
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