Aerodynamic optimization design for airfoil based on Kriging model

The approximation technology based on Kriging model is applied to the aerodynamic optimization design. The characteristics of the optimization method based on the approximation technology, the traditional gradient-based search algorithm and the standard genetic algorithm are studied, through calculating global extreme of two test functions and re-constructing the geometry of airfoil. The result shows that the optimization method based on approximation technology has good global performance and also can greatly save the calculating resources. This method is applied to the aerodynamic optimization design of airfoil, defining the lift-drag ratio as the goal function, when Mach number is 0.7 and the angle of attack is 3°. The application indicates that the lift-drag ratio of optimized airfoil is increased by 81% comparing with the original airfoil, and the cross section area of the optimized airfoil is decreased less than 1%.