Investigation of Cavity Wind Rotor with Three Blades Vertical Axis

A new type of resistance wind rotor with power-transmission cavity and three blades vertical axis is proposed. Computational Fluid Dynamics (CFD) is employed to numerically research the performance of blades in five typical rotation angles. The pressure of the wind rotor in the fluid field is got based on the static pressure contours of the blades in the five rotation angles. The simulation results show the positive pressure and the negative pressure appear around the blades in a cycle. Both of them can be motive power and resistance power to the wind rotor. The both power cancel out and the total torque output varies with the rotate location. Simulation results show that the largest torque appears at 90°while the least torque appears at 30°. Then, an instrument that measures torque output of wind rotor is designed. The torque output of the rotor in the five typed rotation angles is tested in a circle. The result indicates that distribution of the static torque output is like cosine wave in a cycle which is consistent with the results of the CFD. The studies provide the theory basis and the experimental introduction of the wind rotor designing.