Numerical Simulation Of Erosion Wear Of Undulating Pipelines

In oil pipelines,when the pipeline runs for a long time,some foreign particles will continue to move forward with the flow of fluid,and the phenomenon of erosion and wear of the pipe wall will become more and more obvious,that is,Erosion and wear of liquid-solid two-phase flow.And the erosion degree of the bent pipe part is more serious than that of the straight pipe section.Especially in areas with complex terrain,there will be undulating sections of the pipeline,magazine particles are more likely to deposit at low points,coupled with fluid erosion,will make the elbow wear more serious.Therefore,studying the flow field flow,particle motion trajectory,maximum erosion position and erosion wear of oil products carrying particles has important economic value for actual pipeline construction and safe operation management.This paper chooses the standard k-? model applicable to this subject,uses the DPM model and erosion model based on the Euler-Lagrange calculation method,and numerically simulates the erosion wear of the undulating section of the oil pipeline,and before performing the numerical simulation of each influencing factor,it is necessary to verify the independence of the grid.By comparing and analyzing the maximum erosion wear rate under several different numbers of meshes,it was found that 319,480 meshes were the least computational but highly accurate meshes.number.Later,the parameters of the calculation model will be compared with the experimental results of others to verify the accuracy of the model.Numerical simulation analysis of some factors affecting the erosion wear of the undulating section of the oil pipeline and comparison of their effects on the maximum erosion wear rate found that: The maximum erosion rate will increase with the increase of the fluid flow rate and the decrease of the pipe diameter.At the same time,the maximum erosion rate is inversely proportional to the bending diameter ratio,is directly proportional to the mass flow of the particles,and also increases with the increase of the particle diameter increase.The erosion wear on the outside of the undulating pipe elbow is more serious than that on the inside of the elbow,and the static pressure on the outside is greater than that on the inside of the elbow,while the velocity distribution is opposite to the static pressure distribution.And obtained the erosion law in the flow field,particle trajectory distribution map,wall shear stress distribution cloud map,etc.,and plotted the maximum erosion rate as a function of the factors affecting the study.Analyze them one by one,and get a conclusion that has certain value and significance for the design of the undulating pipeline.For example,the bending diameter ratio is more suitable between 4 and 6.The larger particles should be removed as far as possible before transportation.Properly reducing the flow rate can reduce the degree of wear.The bending head uses wear-resistant materials or thickening.A comprehensive structural model with better anti-erosion effect is obtained.At the end of this article,a summary of numerical calculation simulations and the future research on erosion and wear of pipelines must be considered not only from the above factors,but also from the mechanical properties of the pipeline,whether the operation is safe and the cost required for operation.