Aerodynamic Optimization Design Of Wind Turbine Airfoil Based On Parametric Model

The blade is one of the important parts of the wind turbine,the wind turbine airfoil is the basic component of the blade structure,the aerodynamic characteristics of the wind turbine airfoil is an important factor affecting the wind turbine energy efficiency.In this paper,the wind turbine airfoil is taken as the research object,and the basic theory methods such as parametric modeling,computational fluid dynamics,engineering optimization design,the parametric modeling of wind turbine airfoils and the analysis and optimization of aerodynamic characteristics are studied,which provides a new idea for the research of aerodynamic characteristics of wind turbine airfoils:Firstly,the parametric modeling of wind turbine airfoil based on Class function/Shape function Transformation method is carried out.The geometric characteristics of wind turbine airfoils are described,the characteristics of turbulent wind in the atmosphere are analyzed,and the statistical characteristic model of turbulent wind is established.Based on the Class function/Shape function Transformation method,the relationship between the angle of attack,chord length and the aerodynamic characteristics of the wind turbine airfoil is analyzed.The relationship between the parameterization error and the wind turbine Degree of a polynomial is discussed,a wind turbine airfoil parameterization model is established,which takes into account Degree of a polynomial,polynomial coefficients and trailing edge thickness ratio.Secondly,the aerodynamic sensitivity analysis of wind turbine airfoil based on parametric model.Based on the parameterized model of wind turbine airfoil,the effect of polynomial coefficients on the uncertainty of aerodynamic characteristics is analyzed with the example of wind turbine airfoil S832 based on the grid sampling and Morris global sensitivity analysis,the global sensitivity of the aerodynamic characteristics of a wind turbine airfoil considering the uncertainties of the Degree of a polynomial and coefficients is obtained.Finally,the global sensitivity of the aerodynamic characteristics of a wind turbine airfoil with small angle of attack is analyzed,and the effect of polynomial coefficients on the aerodynamic characteristics of the airfoil is discussed.Thirdly,the multi-objective aerodynamic optimization design of the wind turbine airfoil was carried out.Based on the parametric model of the wind turbine airfoil and the aerodynamic sensitivity analysis,the aerodynamic optimization design requirements of the wind turbine airfoil are determined,the maximization of the lift-to-drag ratio and the maximum lift coefficient are the optimization objectives,and the maximum relative thickness and its position are the constraints to establish the multi-objective aerodynamic optimization design model of the wind turbine airfoil.The weighted Kriging model is used to improve the optimization design algorithm.By combining the weighted Kriging model with the Pareto multi-objective optimization method incorporating a small habitat genetic algorithm,the multi-objective aerodynamic optimization design of a wind turbine airfoil with a certain relative thickness is efficiently accomplished.