Wind rotor automatic air brake

Details Wind rotor automatic air brake Wind rotor automatic air brake

1977-03-02

1979-12-25

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With means moving working fluid deflecting working member...

416 41, 416132B, F03D 704

Patent

active

041803728

ABSTRACT:
A spring-loaded pivoting end plate that is hinged such that it is deployed by centrifugal force into the airstream to thereby act as an aerodynamic brake for wind turbines in overspeed conditions. The brake has a stationary portion fixed on the tip of the turbine rotor and a pivoting portion hinged for movement with respect to the fixed portion. The longitudinal centerline of the brake coincides with the chord line of the turbine blade and the pivoting movement is about a hinge axis that is normal to the rotational plane of the turbine. The planform of the brake has a low aspect ratio shape with the ratio of the fore and aft chordwise length to the width being one or greater. The edges of the brake in the normal running condition extend beyond the contour of the turbine blade to serve as an end plate such that the aerodynamic efficiency of the blade is improved thereby.

REFERENCES:
patent: 932521 (1909-08-01), Wallace
patent: 1537401 (1925-05-01), Blumschein
patent: 2037528 (1936-04-01), Miller
patent: 2076520 (1936-04-01), Swanson
patent: 2148921 (1939-02-01), Allen
patent: 3038543 (1962-06-01), Davidson
patent: 3448811 (1969-06-01), Derschmidt
patent: 3874816 (1975-04-01), Sweeney et al.

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