带障碍90°方形弯管气固两相流冲蚀失效分析

Erosion Failure Analysis of Gas-solid Two-phase Flow in a 90° Square Bend with Obstruction

为了研究固体颗粒属性及流场作用对输气管道冲蚀磨损的影响规律,建立了带障碍90°输气管道物理模型,利用Fluent软件进行仿真分析,分别针对不同的入口流速、不同的颗粒质量流量、不同颗粒粒径、不同颗粒形状系数进行了数值模拟分析。结果显示:流体入口流速从10 m/s增加到20 m/s时,弯管冲蚀速率一直增大;颗粒质量流量增大时,弯管冲蚀速率也随之增大,呈正相关关系;颗粒质量流量一定时,随着颗粒粒径增大,弯管冲蚀速率呈先减小后增大的趋势;颗粒形状从接近于圆形逐渐变尖锐(形状系数从1逐渐变小)的过程中,弯管冲蚀速率逐渐增大。

In order to study the influence of solid particle properties and flow field on the erosion and abrasion of gas pipelines, a physical model of a 90° gas pipeline with obstacles was established, and simulation analysis was performed by using Fluent software. The particle mass flow, different particle diameters, and different particle shape coefficients were numerically analyzed. The results show that when the fluid inlet velocity is increased from 10 m/s to 20 m/s, the erosion rate of the elbow is always increasing;when the particle mass flow is increased, the erosion rate of the elbow is also increased, showing a positive correlation;the particle mass when the flow rate is constant, as the particle size increases, the erosion rate of the elbow decreases first and then increases;in the process of the particle shape gradually becoming sharp from close to a circle(the shape factor gradually decreases from 1), the erosion rate of elbows increases gradually.