Simulation Study On The Influence Of Fluid Flowing Through A Pipe On A Pion Tube Conveying Fluid And Its Structural Optimization

In this paper,the pipeline service time is increasing,and the pipeline is easy to be damaged due to various reasons,which leads to the reduction of the pipeline’s bearing capacity and brings the hidden danger to the safety of the pipeline.With the help of the latest version of ANSYS(Fluent software,the pressure temperature of the fluid in π type pipeline and the distribution of stress and strain in the pipe are simulated under different pressures(0.6 MPA/0.8 MPA/1.0MPA,different temperatures,20 ℃/40 ℃/60 ℃).Simulation studies show that:Under the condition of constant temperature and variable pressure,the greater the inlet pressure is,the greater the fluid pressure in the pipe is,and the fluid pressure decreases gradually during the process from inlet to outlet.The larger the inlet temperature of the fluid,the greater the fluid temperature in the pipe,and the greater the inlet temperature of the fluid,the greater the fluid pressure flowing along the pipe,mainly because of the high temperature of the fluid and the smaller the viscosity.Then the loss of pressure energy is reduced,and the pressure of fluid in the pipe becomes larger.Under the condition of constant temperature and variable pressure,the fluid temperature in the tube gradually decreases from right to left and the extent of decrease is relatively slow,and the influence of fluid inlet pressure on the fluid temperature in the tube is very small,which can be ignored.Under the condition of constant pressure and variable temperature,the larger the inlet temperature,the higher the fluid temperature in the tube,and the smaller the fluid temperature is from right to left.Under the condition of constant temperature and constant pressure,the stress and strain of pipe are all larger than that of straight pipe,the stress of outer arch is bigger than that of inner arch,and the stress of external arch is decreasing gradually.The bend surface is easy to be damaged,especially the outer arch surface of the bend pipe is more easily damaged.The numerical simulation and theoretical analysis show that the bend pipe is easy to be damaged.In order to keep the pipeline running continuously and reduce the hidden danger of safety,it is a more suitable choice to optimize the structure of the bend pipe.In this paper,the blind end three-way tube and the stomach-shaped elbow structure are selected for local optimization.In addition,the two highlights of this paper are that the 1:1,π-shaped pipeline is a common pipeline structure for fluid transportation,which is generally composed of several sections of bends and straight pipes.Before modeling,the stress and torque of the pipe are analyzed,and the overall mechanical structure of the π type pipe is optimized from the point of view of stability.Using ANSYS software to analyze the fluid-solid coupling process between the fluid and the bend pipe,the flow and structure coupling process is analyzed in order to facilitate the modeling and the analysis work.2,which changes from the pressure,respectively.The influence of fluid temperature and pressure in pipe and stress and strain of pipe on π type pipe is analyzed from two aspects of temperature change.The stress distribution of curved pipe can be observed from the cloud diagram of calculation result.And strain distribution,then the corresponding local structure optimization,such as blind end three-way tube and stomach bend.