Design Features and Numerical Investigation of Counter-Rotating VAWT with Co-Axial Rotors Displaced from Each Other along the Axis of Rotation

In this paper, dual-rotor counter-rotating (CR) configurations of vertical axis wind turbines (VAWTs) are briefly inspected and divided into three types. This investigation was focused on one these types—the CR-VAWT with co-axial rotors, in which two equal rotors placed the same shaft, displaced from each other along it rotated opposite directions. For three-blade H-Darrieus properties design terms aerodynamics, mechanical transmission electric generator, as well control system, analyzed. A new direct-driven permanent magnet synchronous generator proposed, built-in low-power PM machines have been added. They perform functions—starting-up overclocking to angular velocity at lifting force blades is generated, stabilizing work gusts act rotors. Detailed paper evaluation aerodynamic performance via 3D computational fluid dynamics simulations. The conducted using CONVERGE CFD software inclusion actuator line model for rotor significantly reduces effort. Obtained results show that both while they rotate directions, had a positive impact other. At optimal distance between 0.3 height, power coefficients upper lower increased, respectively, by 5.5% 13.3% simultaneously some increase their tip-speed ratio compared single-rotor VAWT.