Numerical Simulation Of Erosion And Wear Of Fluid-solid Two-phase Flow In Collecting And Transporting Pipeline

Material damage and machine failure are likely to occur in the oil transportation process.These phenomena will not only affect the normal use of the whole process,but also cause certain economic losses.After continuous research by scholars at home and abroad,it is found that the main reason for this phenomenon is the erosion and corrosion of liquid-solid two-phase flow in the pipe.Two phase flow is the most common flow mode in storage,transportation,chemical analysis and other processes.Due to its unique flow characteristics,the pipeline is eroded and worn,thus reducing the surface protection of the pipeline,resulting in physical and chemical corrosion.In this paper,the existing research situation,the theory,the status quo and the research model of brush erosion are introduced,and through various research methods,the erosion corrosion simulation experiments of typical and special pipe fittings are carried out,to explore the wear situation and analyze the causes of wear and predict its service life.The influence factors of erosion and wear behavior are summarized,and the different parameters of erosion and wear effect in several kinds of oil pipeline erosion simulation are summarized.The results show that the main factors that affect the erosion and wear rate of typical pipeline fittings are: the effect of gravity field,particle size,mass flow of solid particles,liquid velocity,etc.,and the influence laws of each factor are introduced respectively.In this paper,DPM model and k-? model of ANSYS FLUENT software are used to study the phenomenon of particles impinging on the wall of ? type gas pipeline when the gas-liquid two-phase flow medium is introduced.? type pipe has two corrosion areas a and B,and the corrosion area of a is larger than that of B.The maximum wear rate increases with theincrease of flow velocity.The higher the velocity is,the stronger the drag force of the fluid is,the greater the influence on the corrosion degree is.The maximum wear rate increases with the increase of mass flow rate.The growth rate and the maximum corrosion rate can be regarded as linear growth,and there is a positive correlation.By changing the mass flow rate of several groups of particles with different particle sizes,it was observed that the overall maximum wear rate and mass flow rate were approximately linearly correlated,and there was a positive correlation.The maximum wear rate decreases with the decrease of particle diameter.The smaller the particle diameter is,the stronger the ability of particles carried by the fluid is,and the stronger the corrosion degree is.By comparing and analyzing the corrosion degree of different parameters,it can be predicted that the most prone corrosion position is a and B elbows.