摘要
我国现有管道经多年的冲刷以及内外腐蚀后,在关键部位如大小头处存在一定的安全隐患,严重影响了管道的安全运行。本文利用CFD软件,对输气管道大小头内流场进行模拟,得出如下结论:(1)速度等值线在进口段分布较稀疏,对称位置速度变化不大,截面位置越靠上速度变化越大,同一速度等值线向内收缩;(2)同一对称面含水量几乎相同,含水量在小管段靠近壁面先减小后增大;(3)大管段入口处近似不存在剪切应力;变径处剪切应力等值线变密,呈逐渐增大趋势;小管段入口处逐渐变大,而后有减小的趋势;(4)变径处流体冲刷作用较大,需采用耐腐蚀钢材或适当增加壁厚。
After years of scour and internal and external corrosion our countryg existing pipeline has cer-tain potential safety hazard in key parts such as concentric reducer. It has serious influence on the safeay operation of oil pipeline. Using CFD software, this paper simulates internal flow field of gas pipeline in concentric reducer. The conclusions are as follows：（ 1 ）Velocity isoline distribution is more sparse in im- port section and symmetry position speed change is not big, As the bigger the position of section on top speed change is the more inward the velocity isoline contracts. （2）the same Diane of svmmetrv contains nearly the same moisture content, which reduces then increases in the small pipeline near the wall. （3）At the entrance of large section, shear stress does not exist ;shear stress contour becomes close at reducer place, presenting increasing graduauy; at the entrance of small section, it becomes increasingly large,and then have the trend of decreasing. 4） Fluid scour is bigger in reducer place, needing to use corrosion resistant steel or appropriately increasing wall thickness.
出处
《节能技术》
CAS
2013年第3期257-260,共4页
Energy Conservation Technology
基金
中国石油集团公司重点研究项目(KY2011-13)
关键词
大小头
腐蚀
数值分析
concentric reducer
corrosion
numerical analysis
作者简介
刘俊（1981-），男，学士，工程师，主要从事石油化工压力容器、压力管道设计工作。
