固体颗粒对液/固两相流弯管冲蚀作用分析

doi:10.11902/1005.4537.2014.239

中国腐蚀与防护学报

2015, Vol. 35

Issue (6): 556-562 DOI: 10.11902/1005.4537.2014.239

研究报告

本期目录 | 过刊浏览

固体颗粒对液/固两相流弯管冲蚀作用分析

彭文山,曹学文(

)

中国石油大学 (华东) 储运与建筑工程学院青岛 266580

Analysis on Erosion of Pipe Bends Induced by Liquid-solid Two-phase Flow

Wenshan PENG,Xuewen CAO(

)

College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China

全文: PDF(966 KB) HTML

摘要:

采用计算流体动力学 (CFD) 方法分析了不同颗粒参数包括固体颗粒流速、流量及粒径大小对于弯管不同截面冲蚀速率的影响,求解得到固体颗粒运动轨迹,结合颗粒碰撞模型得到颗粒运动对管壁的冲蚀作用。结果表明：冲蚀严重区域主要存在于下游直管段与弯头连接处的侧壁以及下游直管段与弯头连接处的外侧;Stokes数的变化会导致冲蚀严重区域的移动,下游直管段与弯头连接处侧壁区域并不是都会发生严重冲蚀。

关键词 ：弯管, 冲刷腐蚀, 固体颗粒, 轨迹, Stokes数

Abstract：

The effect of particle-parameters of a liquid-solid two phase flow on the erosion rate of different sections for pipebends was analyzed by means of computational fluid dynamics (CFD) in terms of flow rate, particle size and particle velocity etc., while the trajectories of particles were calculated by Lagrange method. Then the relevant erosion mechanism of pipe wall may be acquired by considering the known particle collision model. The results show that: (1) the vulnerable areas mainly exist on the sidewall, as well as the outermost side of the junction of downstream straight pipe and elbow; (2) the change of Stokes number can cause shift of the serious erosion area, whilst not the entire sidewall of the junction of downstream straight pipe and elbow will be subjected to serious erosion.

Key words： pipe bend erosion solid particle trajectory Stokes number

基金资助:国家自然科学基金项目 (51274232) 及中央高校基本科研业务费专项资金项目 (15CX06070A) 资助

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引用本文:

彭文山,曹学文. 固体颗粒对液/固两相流弯管冲蚀作用分析[J]. 中国腐蚀与防护学报, 2015, 35(6): 556-562.
Wenshan PENG, Xuewen CAO. Analysis on Erosion of Pipe Bends Induced by Liquid-solid Two-phase Flow. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 556-562.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.239 或 https://www.jcscp.org/CN/Y2015/V35/I6/556

表1 Reynolds数与Cd的对应关系

图1 弯管计算区域几何模型及网格

图2 冲蚀速率与网格关系曲线

图3 冲蚀速率与上下游长度关系曲线

图4 颗粒流速及弯管截面位置与最大冲蚀速率关系曲线

图5 颗粒流量及弯管截面位置与最大冲蚀速率关系曲线

图6 颗粒粒径及弯管截面位置与最大冲蚀速率关系曲线

图7 颗粒轨迹与冲蚀速率关系示意图

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