Molding Technology To Optimize The Design And High Lift Devices, Based On Control Theory, Multi-element Airfoil

In various optimization method based on gradient solving, control theory method has high efficiency and accuracy in solving gradient. The core idea of control theory is the process of solving adjoint equation, the gradient of object function can be obtained directly with large computational saving over other methods. The control theory method is suitable for the design and optimization with a lot of design variables. The computational time can be greatly reduced by using control theory, and every optimization round is equal to twice flow solver time.This paper includes high lift device molding technology and multi elements airfoil, and the main aspects of this paper are followed:1. An engineering method of high lift device molding is developed. The high lift device aerodynamic shape is realized from 2d to 3d. The landing configuration can be deployed simply by using CATIA. This method has the practical value.2. The numerical simulation calculation of multi elements airfoil is done by using chimera grid technique. The result of the GAW-1 calculation indicates the accuracy and reliability. The result lays the foundation of the multi elements airfoil optimization.3. The viscous adjoint equation and the boundary condition are derived. The gradient formula for pressure distribution inverse design and lift coefficients are also derived.4. Under the design principle of keeping the cruise configuration, the three elements airfoil is optimized. By using the steepest descent method for optimizing strategy, the result of the pressure distribution inverse design calculation indicates that the method is accurate and reliable. The aerodynamic optimization for the maximal lift coefficient is accomplished by choosing the date in up flap and the flap parameters for the design variables.