In order to gain a comprehensive understanding of the unique and complex Darrieus-type pitch motion of vertical axis wind turbine (VAWT) blades
and to clarify the influence laws of geometric parameters on aerodynamic characteristics
taking the NACA0018 airfoil as an object
the dynamic stall characteristics and the development of wake vortices of the Darrieus-type pitch motion of the blades were studied. The PARSEC parameterization method was utilized to obtain the blade geometric parameters. A radial basis function neural network surrogate model was constructed
and the sensitivity of the blade geometric parameters was analyzed using the Sobol index. Results show that in Darrieus pitching
as attack angle gradually increases
the blade suction surface first experiences reverse flow at the trailing edge
followed by leading-edge stall. Moreover
during downward pitch motion
the leading-edge stall causes significant oscillations in the aerodynamic force. The curvature at the maximum thickness and the tail edge deflection angle are the main factors affecting the pitch aerodynamic performance of the Darrieus type
and the blade thickness is particularly important for the moment coefficient. The sensitivity analysis is of great significance for blade aerodynamic profile design.
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