Analysis Of Fluid Structure Coupling Characteristics Of Composite Propeller

In recent years,with the increasing demand for ship performance and the increasing demand for stealth propeller on military submarines,composite propeller with better vibration and noise reduction performance has become an important research object.In the actual working condition,the composite propeller will produce greater deformation than the ordinary metal propeller,and the influence of fluid structure coupling needs to be considered.Based on the workbench platform,the layered modeling of composite propeller is carried out.At the same time,by adding the submarine model,the fluid structure coupling analysis is carried out to simulate its deformation characteristics and dynamic response characteristics under actual working conditions.This paper aims at exploring the mechanism of vibration and noise reduction characteristics of composite propellers.Based on Workbench platform,the layering model of composite propeller was established by using fluid-structure coupling analysis method,and the deformation and dynamic response characteristics of nonuniform flow field behind the ship were analyzed.It lays a foundation for excavating damping and noise reduction mechanism of composite propeller and noise analysis of composite propeller,and has important theoretical and engineering significance.First,the paper compares the hydrodynamic calculation value with the open water test value and validates the numerical method.Then the composite propeller is simplified as flexible homogeneous material.The performance of flexible propellers with different elastic modulus under different operating conditions is compared and the effect of elastic modulus on deformation,dynamic response and hydrodynamic characteristics of the propeller is analyzed.Then the lamination model of composite propeller is established and preliminary wet mode analysis is carried out to obtain the natural frequency of composite propeller.Finally,three conditions are divided according to their natural frequencies.Bi-directional fluid-structure coupling calculation is carried out for composite propellers under three conditions of inhomogeneous flow field behind the ship.Deformation characteristics,dynamic response and deformation and stress of different layers of composite propellers under different conditions are analyzed.