Abstract
Tip speed ratio is an important parameter of describing wind turbine performance. Based on vane airfoil profile, the relationship between vane lift coefficient, drag coefficient and angle of attack is calculated by means of Profili software. The corresponding stall angle is also obtained. The relationship between the position angle of vane and angle of attack at different tip speed ratios is drawn by Matlab software and the corresponding best tip speed ratio is determined rapidly. Based on it, the airfoil tangential force is also analyzed for different vane airfoil profiles in the condition of same Reynolds number.
Highlights
According to the development history of wind turbine, compared with the horizontal axis wind turbine, the outstanding superiority, relative lag of technology development level and low market share rate of MW wind machine have been the present situation of vertical axis wind turbine, and have become the developmental difficulties of vertical axis wind turbine
The vertical axis wind turbine has the following characteristics: i t does not need to adjust the direction of the wind, and its generator, gear boxes and other equipment can be placed on the ground, and so on, and it greatly overcomes the inherent structure defects of horizontal axis wind turbine, which will become the development trend of high efficiency wind turbine
The present vertical axis wind turbine is not applied in commercial production on a large scale in the whole world but it mainly exists in the small and medium-sized market, which generally is caused by the following so-called perspectives: study on the basic theory of vertical axis wind turbine is far less than the horizontal axis wind turbine; coefficient of wind energy utilization of traditional vertical axis wind turbine is lower than one of the horizontal axis wind turbines; and start-up of vertical axis wind turbine is more difficult and it cannot be self-starting [1]
Summary
According to the development history of wind turbine, compared with the horizontal axis wind turbine, the outstanding superiority, relative lag of technology development level and low market share rate of MW wind machine have been the present situation of vertical axis wind turbine, and have become the developmental difficulties of vertical axis wind turbine. By means of Profile software, a method of calculating the tip speed ratio for airfoil profile of vane of lift type vertical axis wind turbine designed by ourselves is proposed in this paper. Based on vane airfoil profile, the relationship between lift coefficient and drag coefficient and angle of attack is calculated out by means of Profili software. The relationship between the position angle of vane and angle of attack at the different tip speed ratio is drawn and the corresponding best tip speed ratio is determined. This is a great help in designing the corresponding wind wheel structure and get the maximum wind energy
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