输气管道弯头处固体颗粒侵蚀的数值分析  

Numerical analysis of solid particle erosion in a gas flow bend

作　　者：张日 朱东 董胜[1] ZHANG Ri;ZHU Dong;DONG Sheng(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《船舶力学》2020年第10期1342-1353,共12页Journal of Ship Mechanics

基　　金：科技部国家重点研发计划课题(2016YFC0802301);中央高校基本科研业务费专项(841513055)。

摘　　要：数值分析方法是预测管道内固体颗粒侵蚀的有效手段。本文验证了数值分析过程中求解输气弯头处固体颗粒侵蚀的每一步骤,即模拟流场、跟踪颗粒、计算侵蚀;在每一步骤中使用不同模型,通过与实验数据对比选择最优求解方法。使用五种不同的湍流模型计算输气弯头处的速度场;使用离散相与连续相的单向耦合与双向耦合方法跟踪颗粒的运动状态;基于颗粒撞击要素,使用四种颗粒冲蚀模型计算弯头侵蚀;基于相似性准则,计算不同模型尺度下侵蚀速率的无量纲数。通过与实验数据进行对比可知:剪切应力传输模型是计算输气弯头内流场的最优湍流模型;离散相与连续相的双向耦合模型对于颗粒运动状态的预测更为精确;Oka颗粒冲蚀模型能够更为准确地计算各流场条件下的固体颗粒侵蚀结果;固体颗粒侵蚀的数值方法符合相似性准则,低输沙率时计算精度更高。Solid particle erosion in piping systems is a serious concern of integrity management in the oil and gas production,and has been widely predicted by the numerical simulation method.In the present work,ev⁃ery step of the comprehensive procedure is verified when applied to predicting the bend erosion for gas flow,and improvements are made by comparing different computational models.Firstly,five turbulence models are implemented to model the flow field in a bend for gas flow and examined by the velocity profile measured in experiments.Secondly,the particle velocities calculated by full coupling and one-way coupling are compared with experimental data.Thirdly,based on the knowledge of flow modeling and particle tracking,four classic erosion equations are introduced to calculate the penetration rates in the bend.Finally,a dimensionless num⁃ber of erosion rate is calculated based on a similarity criterion.Comparison with the experimental data avail⁃able in the literature indicates that the shear stress transfer model is the most accurate and effective turbulent model for gas pipe flow;the fully coupling makes the simulation of particle motion closer to measured data;Oka erosion model is most accurate;the prediction can satisfy the similarity criterion when the particle con⁃centration is relatively low.

关 键 词：颗粒侵蚀 输气弯头 湍流模型 耦合方式 冲蚀模型 

分 类 号：P756.2[天文地球—海洋科学]