NOISE REDUCTION MEANS FOR A WIND TURBINE BLADE, WIND TURBINE BLADE, WIND TURBINE, AND METHOD FOR NOISE REDUCTION FOR A WIND TURBINE BLADE

摘要

Noise reduction means for a wind turbine blade, wind turbine blade, wind turbine, and method for noise reduction for a wind turbine blade Noise reduction means for a wind turbine blade (2) comprising an active noise reduction device (8) and a passive noise reduction device (7), wherein the passive noise reduction device (7) comprises at least one serrated edge profile (9) adapted for fixation to a trailing edge (4) of the wind turbine blade (2), wherein the active noise reduction device (8) comprises at least one unsteady pressure sensor (10) adapted to produce an output signal corresponding to a turbulent flow condition during operation of the wind turbine blade (2), at least one actuator (11) and a control unit (12), wherein the sensor (10) is arranged adjacent to a serrated edge (14) of the serrated edge profile (9) and the control unit (12) is adapted to control the actuator (11) in dependence of the output signal of the sensor (10) to emit an anti-noise signal at least partly reducing the noise generated by the wind turbine blade (2).