A new leading-edge device for wind turbine blades

Tewari, SK (1987) A new leading-edge device for wind turbine blades. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    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 where as the lending edge portion is supported on springs to enable its flap-like movement.This movement is adequately dampened with the help of dashpots.In low and moderate wind speeds the auxiliary airfoil remains undeflected 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 overspeeding.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 atleast respect of small wind turbines.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Auxiliary airfoil;Leading edge spoiler;Regulation;Stall
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Wind Energy Programme
    Depositing User: Poornima Narayana
    Date Deposited: 09 Aug 2006
    Last Modified: 24 May 2010 09:47
    URI: http://nal-ir.nal.res.in/id/eprint/2324

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