Numerical Simulation Of Erosion Wear Of Gas Pipeline Based On Particle Stokes Number

With the development of technology and industry,the status of natural gas as a clean energy in the global energy chain has been increasing year by year.As the main transportation method of natural gas,pipeline plays an important role in the extraction and transportation of oil and natural gas.Due to the high gas pressure in the natural gas pipeline,the pipeline is damaged during the natural gas transmission process,it may cause serious catastrophic accidents,threatening people's lives and property safety.In recent years,accidents caused by leakage of natural gas pipelines have been common around the world,and the safe operation of gas pipelines has gradually attracted people's attention.Related studies have shown that the thinning of gas pipeline walls and the perforation damage are mainly caused by the erosion and wear of solid particles in the pipeline.And the common erosion damage parts mainly occur at elbows,tees and blind tees.Therefore,analyzing and studying the influence of solid particles in typical pipe fittings on erosion and wear to determine the maximum erosion position of typical pipe fittings is of great significance to the life prediction of natural gas pipelines and the safe operation and protection of pipelines.In order to study the erosion simulation of typical pipe fittings of natural gas pipelines.First of all,based on the analysis of the development status and research results at home and abroad,the development of natural gas and the safety hazards of natural gas pipelines are studied,and the solid particles in the natural gas pipeline are determined to cause erosion and wear on the pipeline.Then,the important concepts such as erosion wear theory,computational fluid dynamics equations,discrete phase model,and fluid-solid coupling are explained.Finally,using Ansys Fluent software,based on the discrete phase model and the turbulence model,the erosion of the typical components in the gas pipeline,the inner wall surface of the curved pipe,tee pipe and blind tee pipe was analyzed.By changing the particle size,flow rate and other parameters.The Stokes number of different particles and the same number of Stokes of the same particles,the variation law of the erosion rate of typical components in the gas pipeline are studied,and whether there is a certain relationship between the number of particle Stokes and erosion.(1)The erosion simulation results of the elbow show that the area of erosion and wear mainly occurs on the wall surface of the large arc of the elbow,and the area of erosion is ellipse.The number of particles Stokes corresponding to different flow rates changes,and the erosion wear rate of the elbow increases as the number of particles Stokes increases.The number of particle Stokes corresponding to different particle sizes changes,and the erosion wear of the elbow increases rapidly with the increase of the particle Stokes number,and then stabilizes.(2)The erosion simulation results of the inner wall surface of the tee pipe show that the erosion wear area mainly occurs at the lower wall surface of the left end branch pipe in the horizontal direction of the tee pipe,and the erosion area is approximately circular.The number of particles Stokes corresponding to different flow rates changes,and the erosion wear rate of the tee increases as the number of particles Stokes increases.The number of particle Stokes corresponding to different particle diameters changes.The erosion wear of the three-way pipe decreases rapidly with the increase of the particle Stokes number,and then stabilizes.(3)The erosion simulation results of blind tees show that the erosion wear area mainly occurs on the right wall of the intersection of the horizontal pipe and the lower branch pipe of the blind tee,and the maximum erosion area is ellipse.The number of particles Stokes corresponding to different flow rates changes,and the erosion wear rate of the blind tee increases with the number of particles Stokes.The number of particle Stokes corresponding to different particle sizes changes,and the erosion wear of the blind tee decreases with the increase of the particle Stokes number,and then tends to be stable.(4)When the particle diameter increases and the number of particle Stokes increases,the erosion and wear of the elbow,tee,and blind tee increases faster than the change of flow rate.When the number of particle Stokes is the same,the area and size of the maximum erosion wear of the elbow,tee and blind tee are almost the same,even when the particle size,particle density and flow rate are different.In summary,based on the research results of erosion wear of typical components of natural gas gathering and transportation pipelines,it can not only guide the erosion rate and erosion location prediction of the pipeline under actual working conditions,but also have practical significance for the design and maintenance of pipe fittings in the future.