Concurrent Optimization Of Airfoil High And Low Performances And Its Impact On High-Lift Device Design

As one of the most important aspects in integrated wing design process, this thesis focuses on concurrent optimization of airfoil high and low speed aerodynamic performance and its impact on high-lift device design.A literature review is first provided on airfoil aerodynamic design optimization. Airfoil high and low speed aerodynamic performance design optimization is then proposed, and some engineering design requirements, criteria and design flowcharts related to wing and high-lift device design are also studied and summarized.? Several methods for airfoil geometric representation and their advantages and disadvantages are analyzed, and Hicks-Henne shape function method is chosen as geometric parameterization method in this thesis. A study about effects of computational grid and input parameters of CFD software on computational result is carried out. Then, RANS CFD model and surrogate-based optimization framework are studied and summarized.A concurrent optimization of supercritical airfoil aerodynamic shape at cruise and low speed conditions is then performed. Pareto front for the cruise drag and maximum lift coefficient at low speed is obtained. This is followed by a brief analysis on the effects of airfoil geometry parameters on its aerodynamic performance. Multi-element airfoils are designed using RANS CFD codes on the set of airfoils in the Pareto front. Some analysis on the effect of major airfoil geometry features on the multi-element airfoil design is then provided.