Study On Hydrodynamic And Acoustic Radiation Characteristics Of Moving Airfoil Structures

With the rapid development of underwater vehicles,traditional propulsion technologies mainly rely on propeller propulsion systems,which have poor noise performance.In recent years,the application of biomimetic hydrofoil structures as propulsion systems has become increasingly widespread,and the demand for biomimetic airfoil propulsion technology with low noise,high efficiency,and strong reliability in engineering has become increasingly urgent.This article takes the basic elements of hydrofoil as the starting point for research to analyze the impact of its structural form and motion mode on hydrodynamic and noise performance,which helps to approach the core of the problem.The relevant research conclusions and achievements can provide reference for the design and research of biomimetic airfoils,and have important engineering practical significance.This article takes the airfoil structure as the research object,using overlapping grid technology and RANS SST k-omega On the basis of verifying the accuracy of numerical calculation methods,the turbulence model focuses on studying the influence of moving airfoil structures on hydrodynamic performance and noise characteristics under different geometric dimensions and motion conditions;In addition,the study also focused on the influence of different materials on the hydrodynamic performance and noise characteristics of moving airfoil structures under fluid solid coupling.When exploring the influence of airfoil geometry size,it was found that the NACA0012 airfoil with a trailing edge thickness of 0mm had the best hydrodynamic and noise performance.Regarding the effects of motion frequency,amplitude,and incoming flow velocity,it was found that the hydrodynamic and acoustic performance of the airfoil structure was optimal at a motion frequency of 0.5Hz.At a motion amplitude of 30 °,the sound pressure was the smallest.In addition,as the incoming flow velocity continued to increase,the noise amplitude also increased.However,when the incoming flow velocity was 5m/s and 7m/s,the difference between the two was not significant.Considering the influence of fluid structure coupling,different materials have little effect on the hydrodynamic performance of the moving airfoil,but have a significant impact on the acoustic performance.Among them,the stainless steel airfoil generates the highest noise radiation,while the copper alloy airfoil exhibits the best acoustic performance.