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

基于翼入地面效应（Wing In Ground effect， WIG）的飞行器有望成为未来海上高速船舶的备选方案之一。作为第一个研究，二维（2维）WIG的形状优化问题作为WIG的基础研究进行了讨论。为此，采用面板法对WIG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。给出了若干优化问题的数值算例。采用设计的小型风洞实验方法，对优化后的翼型进行了气动性能测试。作为第二个问题，将Morino的面板方法应用于冲压翼型三维WIG的气动分析，并特别参考了其侧端板的气动特性。在此基础上，讨论了冲压翼型WIG的气动外形优化问题。给出了机翼截面优化的数值算例，并利用基于面板法和非线性规划的气动分析方法进行了优化。在这两个问题中，SQP （Sequential Quadratic Programming，顺序二次规划）技术被用作优化方法，这对于在复杂的设计约束条件下得到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.