Abstract:

In this article, the Class and Shape Transformation (CST)  method for general 3D surface is introduced, the mathematical model of the CST method is analyzed, and a multi block CST method is presented. The multi block CST method connects adjacent surfaces smoothly and remains the properties of CST method. It reduces the number of design variables for surfaces with different curvature distributions, and can also model the different classes of surfaces uniformly. Aerodynamic shape optimization design is built based on the multi block CST method, genetic algorithms and hypersonic aerodynamic engineering calculations, and aerodynamic characteristics of a quasi waverider wing body vehicle have improved significantly after optimization. The study shows that multi block CST method with fewer design variables and higher fidelity extends the applications of CST method dramatically.

Key words: Multi block surface, Class and shape transformation, Quasi waverider wing body, Genetic algorithm, Aerodynamic shape optimization