Patent ID: 7857597
Filing Date: 2010-12-28
Classification: F03D,F05B,Y02E

Abstract:
1. A wind turbine blade comprising: a plurality of boundary layer fins, aligned substantially parallel to a direction of flow over the blade, for reducing boundary layer separation from the blade; each of the boundary layer fins having a height of between approximately 25% to 100% of a local boundary layer thickness at the corresponding boundary layer fin; a top surface of each of the boundary layer fins having a radius of curvature of between approximately 2 to 15 times a local boundary layer thickness at the corresponding boundary layer fin; each of the boundary layer fins having a length of between approximately 2 to 40 times a height of the corresponding boundary layer fin; and wherein the boundary layer fins are arranged in a plurality of pairs, each boundary layer fin in a pair is separated by a first distance of between approximately 2 to 8 times a local boundary layer thickness at the corresponding pair of boundary layer fins; and each pair of boundary layer fins is separated by a second distance of between approximately 2 to 8 times a local boundary layer thickness between the corresponding pairs of boundary layer fins.