Studies on Aerodynamic Shape Optimization of WIG by Means of Panel Method

基于WIG(机翼在地面效应)的飞行器有望成为未来海上高速船的候选之一。作为第一个研究内容，将二维假发的形状优化问题作为与假发相关的基础性研究，采用面元方法对假发周围的流体流动进行分析，并采用非线性规划作为优化方法。给出了几个优化问题的数值算例。采用为小型风洞设计的假肢实验方法，对优化后的假肢翼型进行了气动特性试验。作为第二个问题，将Morino的面元法应用于冲压翼型三维假发的气动分析，特别考虑了其侧端板的气动特性。在此基础上，对冲翼式假发气动外形优化问题进行了研究。文中给出了基于面元方法的气动分析和非线性规划优化机翼截面的数值算例。在这两个问题中，都使用了序列二次规划(SQP)技术作为优化方法，这对于在多种复杂设计约束下获得最优解是非常有用的。

A vehicle based on WIG (Wing In Ground effect) is expected as one of the candidates of future high speed vessels on seaway. As the first study, the shape optimization problem of 2D (2 dimensional) WIG is discussed as a fundamental study with respect to WIG.For this purpose, the panel method is used for the fluid flow analysis around WIG and the nonlinear programming is used as the optimization method. Numerical examples are shown for several optimization problems. An optimized wing section of WIG is tested to verify its aerodynamic characteristics by using an experimental method of WIG devised for a small wind tunnel. As the second problem, Morino's panel method is applied to aerodynamic analyses around a Ram-wing type 3D WIG with special reference to aerodynamic characteristics of its side end plates. Under the consideration of these analyses, aerodynamic shape optimization problems of Ram-wing type WIG are discussed. Numerical examples of optimized wing section are shown, in which the optimizations are carried out by means of the aerodynamic analysis based on the panel method and the nonlinear programming. In both problems, SQP (Sequential Quadratic Programming) technique is used as the optimization method, which is very useful to get the optimum solution under several complex design constraints.