Abstract
The characteristics of the torque generated by the rotating hybrid blades of the new vertical axis wind turbine which has advantages of the drag type and the lift type wind turbine have been investigated by the conditional sampling PIV. The experimental apparatus is constructed using the PIV measurement system with a conditional sampling device and a new hybrid vertical axis wind turbine model installed in a circulating water channel. The tangential forces generated by the blades are calculated by the pressure distribution around the blades calculated from the velocity fields measured by the PIV. It has been clarified that the rotating positions generating torque shifted by the tip speed ratio. Moreover, it has been clarified that the tangential forces generated by the rotating hybrid blades are sourced not only by the lift but also by the drag in the low tip speed ratio case. Therefore, the effectiveness of the hybrid blade for the new vertical axis wind turbine has been demonstrated.
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