Aerodynamic Shape Optimization Design Of Osculating Cone Waverider Based On Kriging Surrogate Model

Because of its high lift-drag ratio,the waverider plays an important role in the aerodynamic configuration of hypersonic vehicle.Compared with the cone-derived method,the method of osculating cones is more common and flexible,which makes it more suitable for the design of the integrative hypersonic vehicle.In this paper,according to the characteristics of osculating cone waverider,a robust and efficient aerodynamic configuration optimization design is developed,combined with optimization algorithms.Firstly,an osculating cone waverider which meets some preset requirement(such as volume)is generated as the initial aerodynamic shape.Then,using the parameters of osculating cone method as design variables and setting the lift-drag ratio as the objective function,a dynamic Kriging model of lift-drag ratio is constructed,while volume and volumetric efficiency are set to be restrictions.The global optimum points of models are searched by adopting the optimization algorithm.After that,the passivation treatment is carried out on the optimized shape above.The FFD parametric method and the spring dynamic grid approach are adopted to optimize the passivated shape.The design variables are some control points on the surfaces of the control body.Similarly,a dynamic Kriging models of the lift-drag ratio is constructed again to get the final aerodynamic shape,and the CFD method is used to calculate the aerodynamic characteristics.While volume and volumetric efficiency remain,the lift-drag ratio of the final shape,compared with the initial optimal shape after passivation,has an increase of nearly 9.3%.The optimal design is quite simple and the results show that it’s a feasible path of the optimal design of waverider.