Analysis Of Pipeline Dynamic Characteristics With Gas-Liquid Two-Phase Flow Based On Clamp Layout Optimization

In fields such as petrochemical,aerospace,and nuclear power generation,the phenomenon of gas-liquid two-phase flow and pipeline vibration caused by gas-liquid two-phase flow is very common.Due to the instability of two-phase flow and the structure of Plumbing and other reasons,the gas-liquid two-phase flow in the pipeline will have complex changes,and the flow pattern changes and pressure fluctuations of two-phase flow will easily cause fatigue failure and leakage of Plumbing and other hazards.Clamp support is an effective way to reduce the vibration of Plumbing,and unreasonable clamp support is often one of the reasons for pipeline failure.The flow of two-phase flow is complex,and the Fluid–structure interaction vibration caused by it is difficult to predict.This paper aims to study the influencing factors of two-phase flow,the transformation characteristics of two-phase flow pattern,the response characteristics of pipeline vibration caused by two-phase flow,and the method of optimizing the clamp layout in Plumbing.The main research categories are as follows:1.The VOF model in Fluent software was used to simulate and analyze the gasliquid two-phase flow in horizontal straight pipes and space pipelines.The effects of factors such as inlet gas volume fraction,mixing speed,and flow cross-section on the two-phase flow pattern and pressure fluctuations were studied.Explored the flow patterns,velocity,and pressure changes of bubble flow,slug flow,and stratified flow in spatial pipelines.Research has shown that the pressure drop of two-phase flow in structures such as corners in spatial pipelines is relatively high,which is prone to the formation of vortex zones.2.A fluid structure coupling analysis model for space pipelines was established to explore the dynamic response characteristics of pipelines under two-phase fluid excitation,such as displacement,displacement velocity,and vibration acceleration.A pipe system model with clamp support is established,and the effects of clamp material,pipe material and two-phase flow fluid excitation with different void fraction on the vibration characteristics of the pipe system are analyzed through commercial software.3.With the maximum displacement and deformation response of the Plumbing as the optimization goal,the parametric modeling of the clamp Plumbing was carried out using Ansys and Solid Works.Response surface method was used to optimize the clamp layout of Plumbing,and the maximum displacement deformation of Plumbing was reduced by 17.748 μm.The failure risk of Plumbing is reduced.4.The vibration characteristics test platform of Plumbing was built,and the dynamic response characteristics of Plumbing under different working conditions were analyzed.The hammer method was used to analyze the laws between the fluid flow,the location of the clamp,the clamp material,the natural frequency of the Plumbing,and the Fluid–structure interaction vibration response of the pipeline.This article analyzes the flow characteristics of gas-liquid two-phase flow using simulation software;Explored the dynamic response characteristics of space pipelines under the action of two-phase flow with different void contents;The clamp position in the space Plumbing was optimized by response surface method;The vibration response characteristics of the pipeline were analyzed through experiments.This study has reference significance for the structural design of gas-liquid two-phase flow pipeline and the layout of clamps in Plumbing.