直接操作FFD技术在翼型气动优化设计中的应用

摘要

The method of applying direct manipulated FFD technique into aerodynamic shape optimization has been researched. Due to the disadvantage of the FFD (Free- Form Deformation) method that the geometrical manipulation is not direct and intuit,the direct manipulated FFD method has been developed by solving each displacement of the FFD control points with some specified geometry point movement, so that the deformation of the target geometry could be directly manipulated. Besides, direct manipulated FFD method could accomplish a relatively small number of design variables together with high order FFD control frame. The study case has shown that applying this method in aerodynamic optimization of airfoil is of good feasibility and result.%几何外形参数化技术在飞行器的气动外形优化设计以及多学科优化设计中是影响其结果和效率的重要因素之一.针对自由变形技术(FFD)无法直接操纵几何外形表面指定点位移的局限性,开展了直接操作FFD技术在翼型参数化及翼型气动优化设计中的应用研究.建立了由翼型表面控制点的位移反求各个FFD控制点位移的求解模式,有效地降低了高阶FFD控制体进行翼型参数化的参数个数,并且具备直接操纵翼型几何外形的能力,更具物理直观性.运用该技术对于跨音速翼型进行了气动减阻设计,显著减小了设计状态下翼型的阻力.