Patent ID: 8523515

Claim:
A rotor blade assembly for a wind turbine, comprising: a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root, the rotor blade further defining a pitch axis; and, a noise reducer configured on a surface of the rotor blade, the noise reducer comprising a plurality of serrations, each of the plurality of serrations defining a centerline, wherein the centerline of each of the plurality of serrations is in the range between approximately 10 degrees from perpendicular to the pitch axis and approximately perpendicular to the pitch axis, wherein a cross-section of each of the plurality of serrations is approximately parallel to a local flow streamline defined for that serration, and wherein each of the plurality of serrations is individually oriented based on the centerline, and wherein a bend angle of each of the plurality of serrations is individually set to a pre-calculated orientation based on the local flow streamline, the cross-section and the span-wise location of that serration.