This article analyses the effect of best blade pitching positions on the power coefficient of vertical axis wind turbine at different tip speed ratios. Analysis of the power coefficient of the vertical axis wind turbine is carried out for optimized six blade pitching curves. The first three pitching curves are designed for the tip speed ratios below 1.5 (0 < λ < 1.5) and other three are for the tip speed ratios in the range of 0 < λ < 3. The double multiple stream tube model is used for the present analysis. The results are compared between the optimized and sinusoidal pitching curves. It is concluded that the best optimized pitch position blade method improves the power coefficient than the typical sinusoidal blade pitching in the range of tip speed ratios 0 < λ < 3.
In this paper, the changeable pitching method is used to improve the Vertical Axis Wind Turbine (VAWT) power output for electric energy generations to partially meet the energy needs for domestic use in a place where continuous wind flow is available. The preset or unchangeable pitch turbines cannot start on their own because of negative tangential force acting on the blades of the turbine. Therefore, the variable pitching method is introduced to solve the starting problem of wind turbines and increase the turbine's efficiency in the form of a power coefficient. The cam and follower variable pitch method is employed for the present analysis. In this research paper, the analytical analysis is done with the momentum stream tube model named as DMST model. The turbine model is tested, and the test results show that the power coefficient (Cp) increases with tip speed ratio, and a maximum power coefficient of about 0.35 is obtained at l = 2.5 at 10 m/s wind speed.
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