Conceptual Design And Hydrodynamic Performance Optimization Of Solar-powered AUV

As the platform for carrying ocean detection sensors,autonomous underwater vehicle(AUV)has been widely used in Marine environment monitoring and Marine resource development.However,due to the limited battery capacity carried by AUV,its application in these tasks has been limited.In order to realize the long-term deployment of AUV,this paper designs a kind of solar-powered AUV,which can effectively improve the endurance of AUV by bringing energy supplement to the battery through solar panels,and realize long-term monitoring of the Marine environment and continuous collection of Marine data.In this paper,according to the features of solar AUV,on the overall concept design,and through the numerical simulation of the preliminary design scheme for horizontal wing shape and location of the optimization design,at last,by circulating water tank model experiment demonstrates the optimized design scheme,at the same time,through the numerical simulation analysis of the circulation channel blocking effect in the model test on the effects of hydrodynamic performance prediction.Firstly,through analyzing the performance characteristics of solar-powered AUV,the conceptual design of solar-powered AUV is completed.On this basis,the shape,pressure structure,energy system,buoyancy control system and rudder are preliminary analyzed and designed.Then,CFD method is used to optimize the design of the horizontal wing of solar-powered AUV.The hydrodynamic performance prediction of solar-powered AUV under horizontal wings of different shapes and positions was completed by numerical simulation method,and the relevant hydrodynamic coefficients of direct and vertical planes were obtained.The results show that the shape of the horizontal wing has little effect on the hydrodynamic performance of direct flight and vertical oblique flight.The position of the horizontal wing has little effect on the hydrodynamic performance of direct flight,but has a greater impact on the hydrodynamic performance of vertical oblique flight.This research provides reference suggestions for the horizontal wing design of AUV.Finally,the hydrodynamic performance of the optimized solar-powered AUV is analyzed by means of model test and numerical simulation.The reliability of the numerical simulation is verified by comparing the results of infinite water area,circulating water pool calculation domain and model test.In order to study the influence of the wall and bottom of the circulating flume on the hydrodynamic performance of solar-powered AUV,this paper simulated the direct and oblique navigation tests of different scale ratio models by numerical calculation in the same flume calculation domain,and obtained the relevant hydrodynamic coefficients.The results show that the hydrodynamic performance of the model with smaller scale ratio is less affected by the blocking effect and is more consistent with the calculated value under infinite water.