Numerical Study on Aerodynamic Performance of Solidity Combined Vertical Axis Wind Turbines

To seek a reliable solution that enhances the self-starting performance of vertical-axis wind turbines while maintaining high-efficiency operation, three-dimensional numerical models of double-solidity vertical-axis wind turbines were constructed using different structural parameter ratios. The study investigated the influence patterns of rotor offset angle, blade height ratio, blade count, chord length variation on the aerodynamic performance of double-solidity vertical-axis wind turbines. Results indicate: Rotor offset angle has no significant effect on aerodynamic performance. A relatively optimal blade height ratio of 1:1 exists. Increasing combinations of blade count and chord length enhance both wind energy utilization rate and moment coefficient at low tip speed ratios. The dual-solidity VAWT configuration combining high-solidity and low-solidity rotors still exhibits optimal power characteristics at lower tip speed ratios, while the moment coefficient increases by approximately 20% to 550% to varying degrees.