A blade pitching approach for vertical axis wind turbines based on the free vortex method

This paper presents a variable pitch (VP) approach for a vertical axis wind turbine running at rated or higher tip speed ratios (TSRs) in order to improve the blade aerodynamic performance at the azimuth angle with a low angle of attack (AoA) and the peak power coefficient (Cp) of the wind turbine. The four largest pitch angles occurred in each quadrant in the proposed VP approach, whereas the two largest pitch angles occurred at azimuth angles...