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

基于地效翼的飞行器有望成为未来海上高速船的候选者之一。本文首先对二维地效翼板的形状优化问题进行了基础性研究，采用面元法对地效翼板周围的流体流动进行了分析，并采用非线性规划方法进行了优化。几个优化问题的数值例子。利用为小型风洞设计的地效飞行器实验方法，对优化后的地效飞行器翼型进行了气动特性实验。作为第二个问题，Morino的面元法被应用于绕冲压翼型三维地效翼的空气动力分析，特别是其侧端板的空气动力特性。在此基础上，讨论了冲压翼地效翼的气动外形优化问题。给出了优化翼型的数值算例，其中优化是通过基于面元法和非线性规划的气动分析进行的。在这两个问题中，SQP（序列二次规划）技术被用来作为优化方法，这是非常有用的，以获得在多个复杂的设计约束下的最优解。

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.