Analysis Of Wall Vibration Induced By Vane Wheel Of Circulating Water Channel

Circulating water channel is widely used for hydrodynamic tests in the fields of shipbuilding and ocean engineering.Now more and more researchers are conducting experiments in circulating water channel,and engineering reference materials for the construction of large circulating water channel demands require research on the optimal design of large-scale circulating water channel.However,there are some difficulties in the design of large circulating water channel.Among them,the core component of the design of vane wheel is a difficult point.Another difficulty is the vibration reduction design of the circulating water channel.Especially for the large circulating water channel,vibration is a problem that needs to be considered.Changes in the radius and corners of the circulating water channel will result in changes in the flow rate and pressure,which will cause the body of circulating water channel to vibrate and generate noise.Moreover,the circulating water channel is an internal flow movement with low noise attenuation rate.Circulating water tanks mostly use vane wheel to drive water flow,so the main reason for the steady-state forced vibration is the periodic excitation force caused by the rotation of the vane wheel.When the natural frequency of the body of the circulating water channel is equal to the frequency of the excitation force of vane wheel,resonance will be caused.To study the vibration of the circulating channel,the fluid-solid coupling problem is involved.With the development of computational fluid dynamics and fluid-solid coupling theory and methods in recent years,the numerical method of the two-way fluid-solid coupling has been realized.In this paper,the elastic deformation of the wall of the circulating water channel is considered,and a numerical method considering the two-way fluid-solid coupling of the wall of the circulating water channel and its internal flow field is established.The laws of the wall vibration of the circulating water channel,the flow field in the channel and the hydrodynamic noise of the vane wheel are studied.This paper first uses the panel method to optimize the internal propulsion vane wheel of the circulating water channel,and selects the vane wheel with good hydrodynamic performance for the circulating water channel through variable parameter analysis.Then,on this basis,the vane wheel data points obtained by the panel method are modeled with UG software,and the Hypermesh software and Star-ccm+ software are used to divide the mesh of entire computational domain,and then the Star-ccm+ software is used to establish two-way fluid-solid coupling numerical method to analyse the hydrodynamic performance of the vane wheel and the stress and strain in the wall area.When establishing the numerical model,the k–? SST separation vortex model is used to calculate the fluid area,and the finite volume method is used to obtain the stress and strain in the wall area.Numerical results show that the vibration of the wall of the circulating water channel is mainly in the radial direction,and the vibration in the tangential and axial directions is very small.The change period of the radial deflection is consistent with the pressure of the flow field near the wall.The impact of the number of vane wheel blades and speed,the period of radial deflection change has a large period and a small period.The large period corresponds to the shaft frequency of the vane wheel,and the small period corresponds to the blade frequency of the vane wheel.When the rotational speed of vane wheel is high enough,the period of radial deflection is also obviously affected by the natural frequency of the solid area on the wall.