Prediction of Flow Field Characteristics of Solid-Liquid Phases and Erosion Corrosion in Elbows of Oil-Gas Pipelines Using Numerical Simulation

In order to quantitatively describe the changes of flow field characteristics and the internal erosion corrosion damage process due to the change of fluid direction in bends of pipelines, an erosion physical model of 90° elbow pipe was established under the Workbench platform, from which the distribution rules of pipe wall pressure, shear stress and fluid velocity in the elbow were obtained. The results show that the flow field in the elbow was complex, resulting in severe erosion corrosion in this place. The erosion corrosion of the outside of the elbow was most serious, followed by the straight section near outlet. There was almost no erosion corrosion on the inlet straight pipe and the inner side of the elbow. Larger diameter sands carried more kinetic energy and impact force, resulting in severer erosion corrosion on the tube wall.