Velocity distribution around the tip vane of HAWT blade

Power augmentation of HAWT with tip vane has been achieved at Mie University. This reason are mainly considered due to the reduction of the tip vortex and the diffuser effect by the tip vane. However, these effects has not been verified quantitatively. To get the detailed structure of the wake of a rotor model with tip vane, the near wake measurements have been performed. In these measurements, a three dimensional hot wire probe was used to measure the three velocity components : axial, radial and tangential component. The result of measurements revealed the preceding effects of the tip vane. Some other phenomena of the tip vane have been verified.