Patent ID: 8157532

Claim:
A wind turbine comprising at least a blade ( 11 ) having an aerodynamic profile with a leading edge ( 13 ), a trailing edge ( 15 ) and a suction side and a pressure side between the leading edge ( 13 ) and the trailing edge ( 15 ), wherein the blade ( 11 ) includes an anti-noise device ( 31 ) placed on the suction side formed by a plurality of elements ( 33 ) which are bodies of an arrow shape, said bodies being defined by left and right upper and lower trapezoidal faces ( 51 , 53 , 55 , 57 ) with common central sides from an arrow tip ( 41 ) to an arrow center ( 43 ) and lateral faces ( 61 , 63 , 65 , 67 , 69 , 71 ) extending between said upper and lower trapezoidal faces ( 51 , 53 , 55 , 57 ), that modify a frequency spectra of boundary layer noise.