Research On Hydrodynamic Performance Of An AUH Equipped With The Vertical Vectored Propulsor

This paper researches on a novel dish-shaped AUV named autonomous underwater helicopter(AUH),which has the ability of full-circle steering and free take-off and landing.Vertical motion is one of the most important functions of the AUH.In the complex sea environment,the buoyancy regulation system responds slowly when encountering the interference of the sea currents during the diving,and cannot get rid of the influence of currents immediately.In this case,it is necessary to design an economical mechanism which can accomplish and stable vertical motion to assist the vertical movement of the AUH.Therefore,the vertical vectored propulsor is proposed in this paper.Based on the hydrodynamic analysis software ANSYS-FLUENT,its hydrodynamic performance is calculated and analyzed.Focusing on the research goal of underwater helicopters,the research content of this paper can be summarized as follows:Firstly,a vertical vectored propulsor mechanism is designed around the free take-off and landing function of the AUH.When the AUH is rotating dives,it forms a propeller-like structure with the AUH,which generates the same thrust in the direction of motion and enhances the vertical motion capability.Based on the CFD method,the simulation software is used to calculate and analyze the vertical dive motion of the AUH in different paddle area ratios.Compared with the calculation results of the previous research results,the results show that as the paddle area ratio increases,the resistance becomes larger.At the same time,the grid-independent verification is carried out to analyze the hydrodynamic performance.Hydrodynamic effects of the paddle ratio,the number of blades,the paddle shape and the pitch angle on the vertical plane motion are studied.Exploring the optimal solution of the above parameters.For the numerical verification of the MAU4-53 propeller,the hydrodynamic performance analysis of the propeller is compared with the experimental data,which shows that the maximum error is 9.84%and the minimum error is only 2.12%.The accuracy of the calculation results is verified.Finally,the pool experiment is carried out.The experimental data is compared with the simulation data and the results show that the maximum error is less than 10%,which verified the rationality and effectiveness of the simulation.