Investigation on the shape optimization of wide-envelop air-breathing hypersonic vehicle

Aimed at the aerodynamic optimization problem of the wide-envelope air-breathing hypersonic vehicle, an aerodynamic shape optimization model based on multi-point weight distribution is established according to mission requirements. The aerodynamic performance analysis is based on "CFD+ quasi-one-dimensional flow" method. A set of layered optimization frameworks based on the proxy model and the gradient algorithm is developed by improving the existing parallel point addition strategy to consider both the efficiency and the accuracy during the aerodynamic shape optimization. A function calculation example is used to verify the improved point addition strategy. The aerodynamic shape of the air-breathing hypersonic vehicle is optimized in the current layered optimization framework. It shows that the vehicle's aerodynamic performances at all evaluation points are improved while meeting the constraints of various disciplines.