Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Openwork
Patent
1993-09-30
1995-04-11
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Openwork
416242, 416DIG8, F03B 312
Patent
active
054052467
ABSTRACT:
A vertical-axis wind turbine includes two or more elongated blades connected to a rotor tower. The tower defines an axis of rotation and is linked, preferably via a gearbox or other torque-converting arrangement, to the shaft of a generator. Each blade is "twisted" so that its lower attachment point is displaced angularly relative to its upper attachment point. In a preferred embodiment, the radial distance of each blade from the axis of rotation varies between upper and lower attachment points such that the blade lies approximately along a "troposkein", which is the shape assumed by a string clamped at each end and spun about an axis passing through the ends of the string. The ratio between blade chord length and blade thickness is preferably constant over the length of each blade, with the middle of each blade approximately 80% as thick as its ends. The cross-section of the blades may be teardrop-shaped, shaped as an airfoil, rectangular, or curved in some other way.
REFERENCES:
patent: 3918839 (1975-11-01), Blackwell et al.
patent: 4449053 (1984-05-01), Kutcher
O. Ljungstrom, "L-180 Poseidon"- A New System Concept in Vertical Axis Wind Turbine Technology; Paper presented at the Third International Symposium on Wind Energy Systems, Aug. 26-29, 1980; pp. 333-355.
Larson James A.
Look Edward K.
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