Research On Vibration Control Characteristics Of Fluid-structure Coupling Of High Pressure Manifold

During the operation of the fracturing high-pressure manifold,due to long-term high-speed and high-pressure fluid pulsation,manifold connectors,manifold's own static load and other factors,the manifold's vibration will cause serious damage to the strength of the manifold and reduce the service life of manifold,in order to better protect the overall safety of the manifold and reduce the risk of damage to the manifold due to vibration.Therefore,this paper takes the high-pressure manifold of the actual engineering operation as the research object and vibrates it.Research on characteristics and vibration control mechanism.Firstly,according to the research theories of related scholars,referring to related knowledge of fluid mechanics,elastic mechanics,vibration mechanics and so on,the simplified dynamic differential equation of the high-pressure straight manifold is deduced,and the main factors affecting the vibration of the high-pressure manifold are analyzed.Secondly,using three-dimensional software to simplify the model of the manifold,import the simplified model into the finite element software for pre-processing operations such as runner extraction,boundary naming,meshing,etc.Combined with the actual working conditions of the high-pressure manifold,the fluid analysis of the manifold is carried out,and the advantages and disadvantages of the T-type and the Y-type structure layout of the manifold are compared from the pressure loss,erosion degree,stress and deformation and other factors,so as to provide theoretical guidance for the selection of high-pressure manifold operation.Furthermore,analyzing the modal shape and frequency of the high-pressure manifold from different restraint types and different spring stiffness,and comprehensively compare the influence of various restraint methods and spring stiffness on the overall vibration of the manifold;as the restraint methods change,The deformation area and vibration amplitude of the manifold change accordingly,especially the dangerous area of the straight pipe section has been significantly improved,the natural frequency of the manifold is gradually increasing,when the system frequency is at a low frequency,resonance can be well avoided;With the addition of elastic support devices,elastic constraints can relieve local stress concentration in the manifold and protect the manifold,while fixed constraints can increase the overall stiffness of the straight manifold and reduce the vibration response of the manifold in the vertical direction,which is effective Controlled the vibration of the manifold.Finally,considering that the fracturing fluid displacement and fracturing load pressure are important factors affecting the vibration of the manifold,a single control method is adopted to specifically analyze the impact of different flow rates and pressures on the vibration amplitude and frequency of the manifold fluid-solid coupling.The analysis results show that: with the change of flow velocity and pressure,the stress and deformation of the manifold are increasing,but the pressure is the main factor causing the overall vibration of the manifold.The increase in pressure will significantly aggravate the deformation of the pipe body and the deformation of the pipe wall.The degree of damage is aggravated.In addition,the more prominent deformation of the manifold in the three directions of X,Y,and Z is the fluctuation in the Z direction.Therefore,for ultrahigh pressure manifolds,the working pressure of the manifold must be carefully considered and reasonable constraints in the Z direction must be added.Reduce the vibration amplitude of the manifold and extend the service life of the manifold.