Numerical simulation study on the influence of incident position on erosion characteristics of gas-particle two-phase flow in 90° elbow:

摘要

In gas gathering pipeline system, 90° elbow suffers constant and severe collision of gas-carrying particles, which causes serious erosion on the inner wall. In this study, models of standard elbows (carbon steel with 210?GPa in elasticity modulus and 8300?kg/m3 in density) whose diameter varies from 65 to 200?mm with curvature ratio 1.5 are established to predict erosion rate causes by silica sand (100?μm in diameter, 1550?kg/m3 in bulk density) under gas gathering operating conditions (5.0?MPa, 10?m/s). Unlike most of the previous studies which only focus on erosion result on the wall, in this article, author extracts sample particles as research objects and studies the motion of every single particle. It has been found that there are three typical types of particle motion patterns in the elbow, and a part of sand particles released from lower area of incident plane will not even cause erosion.