WIND TURBINE BLADE
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United States of America Patent
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app pub date -
Nov 15, 2012
filing date -
Nov 23, 2011
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Abandoned
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Abstract
A wind turbine blade is described having noise reduction features. The blade has a plurality of projecting elements provided at the blade trailing edge to reduce the scattering noise produced during operation of the blade. The blade further comprises a fluid injection system which can inject a fluid into the turbulent airflow at the trailing edge of the blade, to absorb some of the turbulent kinetic energy at the trailing edge and accordingly further reduce the levels of output noise produced by the blade. In a further aspect, the fluid injection system may be adjustable to inject fluid in an upstream direction, i.e. against the oncoming airflow, in order to provide an increased absorption of turbulent kinetic energy from the incident airflow, and accordingly to provide improved noise-reduction characteristics.
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