Study on the Real time and Efficient Adjustment Law for H-Type Vertical Axis Wind Turbine

doi:10.3901/JME.2018.10.173

Abstract

Abstract: Angle of attack of blade is one of the most important factors that affect the aerodynamic characteristic of a vertical axis wind rotor. For a kind of 1 kW H-type vertical axis wind turbine with symmetric airfoil, the theoretical optimum angles of attack 10.7ånd -10.7°of upwind area and downwind areas of wind rotor are determined for the purpose of obtaining the maximum utilization rate of wind power of the wind wheel. For the existing wind rotor, the change law of blade angle of attack is similar to the sine curve, not in the vicinity of an optimum value, and so the blade angle of attack needs to be adjusted real-time. First, the change of blade attack angle in the upper wind area is calculated based on the multi flow management theory of double actuated disk. And the relationship between blade installation angle and angle of attack is established. By adjusting the installation angle, the blade angle of attack is maintained at a reasonable value in the upwind area. Considering the complex flow field in the downwind area, the sizes and directions of induction velocity various orientation are obtained by using numerical simulation method. Based on it, the concept of local tip speed ratio in downwind area is presented, the calculation formula of blade angle of attack is established in the downwind area, and the adjustment law of blade angle of attack is also obtained. Finally, based on the Multi flow management theory of double actuated disk, the calculation results show that the utilization rate of wind power of the wind rotor can be increased by 11.03% by the real-time adjustment law of blade angle of attack proposed in this paper compared with the original wind turbine.

Key words: induction velocity, installation angle, local tip speed ratio, optimum angle of attack, vertical axis wind turbine

CLC Number:

KT83

ZHANG Lijun, ZHAO Xinhui, WANG Hanxiang, LIU Yanxin. Study on the Real time and Efficient Adjustment Law for H-Type Vertical Axis Wind Turbine[J]. Journal of Mechanical Engineering, 2018, 54(10): 173-181.

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