An aerodynamic optimization design method based on improved Kriging model for wind turbine airfoils is proposed to meet the current aerodynamic performance optimization requirements.Firstly,the CST airfoil parameterization method is used to convert the initial airfoil geometry into a parameterized model which can be identified by a computer.Then,an improved Kriging model with weighted variogram is established by the weighted processing of the least squares principle.Combined with niche genetic algorithm,the airfoil is constructed by selecting appropriate samples from the variable space of the parameterized model,aiming at minimizing the drag coefficient and moment coefficient.The aerodynamic optimization design of airfoils is carried out under the constraints of lift coefficient and maximum thickness not lower than the initial value.Finally,the optimization airfoils are verified by CFD simulation,and at the same angle of attack of incoming flow,the aerodynamic characteristics of the optimized airfoil are compared with that of the initial airfoil.Results show that the drag coefficient and moment coefficient are reduced by 0.42％and 0.25％respectively,at the same time,the lift coefficient is increased by 6.25％.The validity of the method is proved,which provides a new approach to aerodynamic design of wind turbine airfoils.
关键词
最小二乘法/Kriging模型/优化设计/翼型参数化
Key words
least squares method/Kriging model/optimization design/airfoil parameterization
维普
万方数据