基于CFD的立式天然气弯管气固两相流冲蚀数值模拟分析

Numerical simulation analysis of gas-solid two-phase flow erosion in vertical natural gas bends based on CFD

采用CFD-DPM模型,在不同连续相流体流速(v)、固体颗粒直径(d)、弯径比(R/D)的工况下,研究天然气管道内气固两相流颗粒冲蚀率与冲蚀样貌。模拟结果表明,随着v增加,高冲蚀区域逐渐变大,冲蚀范围逐步向下游移动,v>20 m/s时,冲蚀样貌基本不变,颗粒冲蚀率迅速增加;d<30μm时,冲蚀范围较为分散,弯头内侧与外侧均有分布,随着d的进一步增大,流体影响减小,冲蚀范围集中于弯头外侧,颗粒冲蚀率迅速下降,并趋于平缓;R/D<3时,随着R/D的增加,弯管内壁颗粒冲蚀率迅速减小,但R/D>3时,颗粒冲蚀率下降速度放缓。

The CFD-DPM method was adopted to investigate the particle erosion rate and erosion morphology of gas-solid two-phase flow in natural gas pipelines under different continuous phase velocity(v),particle diameters(d),and bending diameter ratio(R/D).The simulation results indicate that as the v increases,the high erosion area gradually expands and the erosion range progressively shifts downstream.When the v is greater than 20 m/s,the erosion morphology remains basically consistent,while the particle erosion rate increases rapidly.When the d is below 30μm,the erosion range is relatively dispersed,with distributions on both the inner and outer sides of the elbow.As the d further increases,the fluid influence decreases,and the erosion range concentrates on the outside of the elbow,leading to a rapid decrease in particle erosion rate and a tendency to stabilize.When the R/D is less than 3,an increase in R/D results in a sharp decrease in particle erosion rate on the inner wall of the bend.However,for the R/D exceeding 3,the erosion rate of particle decreases at a slower rate.