Overspeed spoilers for vertical axis wind turbine
Patent
·
OSTI ID:6748226
An overspeed spoiler is described for vertical axis wind turbines of the type having straight or curved airfoil blades attached to a vertical shaft formed by a relatively thin flat blade shaped spoiler element hinge mounted on the trailing edge, leading edge, or at a central position of a portion of the airfoil section. The element has two portions one of which is held flush or against a surface by spring means with a surface of the blade towards the turbine rotor axis and the other lies substantially parallel to the chordline of the airfoil. The weight and configuration of the element is such that at a predetermined turbine rotor speed the element rotates against the spring force because of centrifugal action and takes up a position generally transverse to the air flow direction such as to cause much increased drag and control overspeeding of the rotor.
- Assignee:
- Canadian Patents and Development Ltd.
- Patent Number(s):
- US 4082479
- OSTI ID:
- 6748226
- Country of Publication:
- United States
- Language:
- English
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