Joined-wing Underwater Glider Shape Design And Hydrodynamic Performance Analysis

Underwater gliders work by converting the lift generated by their hydrofoils into power to propel them forward,and by adjusting their attitude of motion by their internal regulators.The higher the lift and the lower the drag,the higher the lift drag ratio and the gliding efficiency of the glider.In order to increase the lift drag ratio and improve the hydrodynamic performance of the underwater glider,this thesis applies the advanced joined-wing layout in the aviation field to the shape design of the underwater glider,designs the shape of the joined-wing underwater glider,and analyzes the influence of the shape parameters on the hydrodynamic performance of the joined-wing underwater glider.The main works are as follows:Firstly,the SUBOFF submarine scale model was simulated by STAR-CCM+software,and the simulated values obtained after the simulation were compared with the experimental values to verify the accuracy of the numerical calculation method.Secondly,based on CFD method,the hydrodynamic performance of different body,hydrofoil and joined-wing layout methods are compared,and the initial shape of joined-wing underwater glider is designed.The hydrofoil parameters of Slocum underwater glider were introduced,and the corresponding models of conventional swept-back underwater glider and joined-wing underwater glider were established to compare and analyze their hydrodynamic performance,and the results showed that the joined-wing underwater glider has better lift drag characteristics.Again,according to the shape characteristics of the joined-wing underwater glider,the shape parameterization method of the joined-wing layout are proposed,and they are dimensionless to make them widely applicable,and the parameterization modeling of the joined-wing underwater glider is realized by the equation function of Solid Works.Then,gliding economy and stability are taken as the analysis indexes of hydrodynamic performance,and the effects of different joined-wing layout parameters on the hydrodynamic performance of gliders are analyzed to summarize their influence laws on hydrodynamic performance.Finally,the BBD test was used to optimize the response surface design by using the maximum lift drag ratio as the optimization objective and the,,andas design variables.The coupling effect of each parameter on hydrodynamic performance was analyzed by response surface,and the shape optimization design of the joined-wing underwater glider was completed.The optimization results show that compared with the initial shape,the optimized shape not only ensures the stability,but also improves the maximum lift drag ratio.