Research On Wind Turbine Airfoil Profile Design Based On Aerodynamic Performance And Cross Section Stiffness Characteristics

As a medium for converting wind energy into electrical energy,the aerodynamic performance of the airfoil and the cross-sectional characteristics of the blade are one of the criteria for measuring the performance of the blade.Therefore,the study of the airfoil and cross-section characteristics of wind turbine blades has important practical significance.The specific research contents of the thesis are as follows:In this paper,the influence of the geometric parameters and fluid parameters of the airfoil on the aerodynamic performance of the airfoil is discussed.The calculated method for the aerodynamic performance of the airfoil is studied.The aerodynamic characteristic curve of the airfoil is obtained by calling the rfoil software with MATLAB programming.The comparison of the aerodynamic characteristic curve with the experimental results in the literature shows that the rfoil software can obtain the aerodynamic performance of the airfoil,as well as provides calculation tools for calculating the aerodynamic performance of the airfoil.Then the expression of the curve is analyzed.Based on the NURBS curve,the airfoil profile is expressed,and the corresponding airfoil coordinate points are obtained.Subsequently,the structural characteristics and mechanical properties of the composites were expounded,and the layers of the blade sections(airfoil leading edge,main beam,airfoil trailing edge and web)were laid and designed in combination with classical laminate theory.The mathematical model of the cross-section characteristics of the wind turbine blade is calculated,and the MATLAB program corresponding to the mathematical model is written.The results are compared with the calculation results of PreComp and ANSYS to verify the correctness of the model and the program.Finally,considering the aerodynamic performance and cross-section characteristics of the airfoil,combined with the NURBS curve,the ordinate of the apex of the airfoil curve is used as the design variable,and the integrated design model of the blade airfoil profile and cross-section stiffness is established.The point method is used to construct an objective function that comprehensively considers the aerodynamic performance and cross-section characteristics of the airfoil.Combined with the particle swarm optimization algorithm,the airfoil with relative thicknesses of 18%,21% and 25% is optimized.The obtained airfoil is compared with the performance of NACA63418,NACA63421 and DU91W2250 airfoil.The optimization results show that the obtained new airfoil has improved aerodynamic performance and cross-section characteristics,and the overall performance of the blade is better.This study has important practical significance for the collaborative design of blade airfoil and cross-section characteristics.