Simulation Analysis And Optimization Of Aerodynamic Performance Of Wind Turbine Blade Airfoil

The primary function of wind turbine blades is to capture wind energy and convert it into mechanical energy.The efficiency of wind turbines is directly affected by the aerodynamic performance of the blades,with the airfoil being a decisive factor in the blade’s performance in the air flow.Therefore,optimizing or improving the airfoil is crucial to obtaining better blade performance.This thesis focuses on the optimization of wind turbine blade airfoil and involves parameterized modeling,aerodynamic performance calculation,airfoil data optimization,and software development using C++ and Python programming languages.The thesis first investigated the CST parametric modeling method of airfoil,analyzes and improved the key parameter calculation,and discussed the influence of the number of shape function selection on the accuracy of parametric modeling.The optimal number of the CST parametric modeling method of airfoil was selected,and the improved CST parametric modeling module program was developed,followed by the modeling analysis of the airfoil example.This laid the foundation for airfoil data to solve the optimization problem of airfoil aerodynamic performance.Next,the vortex panel method was applied to the aerodynamic performance calculation of airfoil,and the adaptive panel partitioning method was proposed.The corresponding calculation accuracy of airfoil aerodynamic performance was discussed,including the calculation of lift coefficient and lift-drag ratio of airfoil based on the vortex panel method.This provided an important comparative analysis tool for the optimization of airfoil aerodynamic performance.The thesis then explored the airfoil aerodynamic performance optimization algorithm and selected the genetic algorithm as the primary method of airfoil aerodynamic performance iteration and searching for the optimal solution.Based on the characteristics of the airfoil aerodynamic performance optimization problem,the key operation process of the classical genetic algorithm was improved.Finally,the thesis examined the overall optimization process of airfoil aerodynamic performance,sorted out the relationship between modules,designs the function,architecture,man-machine interface,and implementation method of the wind turbine blade airfoil optimization system,and completed the software system development of airfoil aerodynamic performance optimization.The two airfoils were optimized by the software system,and the method and the software system were verified by CFD simulation.To ensure the generality of the method,different airfoil families or airfoil completion methods are used in each research.The simulation analysis results show that the optimized airfoil obtained by the aerodynamic performance optimization method and software system has a significant increase in the lift coefficient,lift-drag ratio,and other parameters compared with the original airfoil at different angles of attack,proving the research to be reasonable and effective.