双向水平轴潮流能水轮机翼型优化设计OA

To address the bidirectionality and reliability of horizontal-axis tidal-current-energy-powered turbines,an automatic optimization model is constructed to optimize the lift-to-drag ratio of the airfoil.The optimized airfoil airfoil,is a fully symmetric airfoil that was constructed by modulating(intercepting and splicing)the NACA0012 airfoil,which serves as the base airfoil.The model employs the class-shape transformation parameterization method for the airfoil shape,integrating ANSYS ICEM CFD meshing,Fluent-based numerical simulation,and a multi-island genetic algorithm.This combined approach obtains a high lift-to-drag-ratio airfoil suitable for the bidirectional operation of horizontal-axis tidal-current-energy hydraulic turbines.Compared with the base airfoil(NACA0012),the optimized,fully symmetric airfoil is flatter,and its maximum relative thickness is reduced by 49.65%.This structural change resulted in a 10.77%increase in the lift coefficient and a notable 46.24%improvement in the lift-to-drag ratio.An analysis of the pressure distribution on the surface of the airfoil reveals that the optimized airfoil design effectively inhibits the flow-separation phenomenon on its suction surface,thereby significantly improving the overall hydrodynamic performance of the airfoil.Overall,this study provides a valuable reference for the optimization of the shapes of blade airfoils in horizontal-axis tidal-current-energy hydraulic turbines.