A New Leading-edge Device for Wind Turbine Blades

Tewari, SK (1987) A New Leading-edge Device for Wind Turbine Blades. Project Report. National Aerospace Laboratories.

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Use of self actuated leading edge spoilers is virtually unknown on wind turbine blades. A simple arrangement has been devised and implemented on a 7.5 metre diameter medium solidity rotor. The leading edge portion of the blade in outer one-third span is mounted offset like an auxiliary airfoil with respect to the trailing edge portion. The latter is a fixed piece whereas the leading edge portion is supported on springs to enable it s flap-like movement. This movement is adequately dampened with the help of dash pots. In low and moderate wind speeds the auxiliary airfoil remains un-deflected and thereby generates a higher overall lift for the blade. In higher wind speeds the airfoil deflects in a manner of getting Progressively stalled and thus providing 'control on rotor over speeding. This movement is self actuated and appears quite stable. Further analytical and wind tunnel studies are recommended to exploit full potential of such an arrangement which is inexpensive and appears appropriate at least in respect of small wind turbines.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: auxiliary airfoil, leading edge spoiler, regulation, st all.
Subjects: RENEWABLE ENERGY > Wind Energy
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms Indrani V
Date Deposited: 09 Jan 2012 10:34
Last Modified: 09 Jan 2012 10:34
URI: http://nal-ir.nal.res.in/id/eprint/10206

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