WIND TURBINE BLADE
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United States of America Patent
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Issued Date -
Jun 21, 2012
app pub date -
Dec 21, 2011
filing date -
Dec 21, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A wind turbine blade is described wherein the blade comprises a hinged flap provided at the leading edge of the blade. The flap is arranged to hinge when the angle of attack of the incident airflow falls below a pre-defined angle, so that the aerodynamic profile of the blade is altered to reduce the magnitude of the negative lift coefficient of the blade. This reduces strain on the blade in such conditions, and associated fatigue loads on the blade and the wind turbine structure. The flap utilises simple biasing means, and does not require complicated sensor or actuation systems.
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