摘要
本文利用Fluent软件模拟突扩管下游的流场分布情况,通过改变入口流速和管道突扩比,得到不同条件下管道下游传质系数的分布规律;基于建立的数学模型,得到突扩管下游的传质系数、腐蚀速率与入口流速、管道突扩比之间的关系。结果表明:入口流速一定时,突扩管下游的传质系数和腐蚀速率随着突扩比的增大呈增大趋势,并且峰值位置均向流动方向偏移;突扩比一定时,突扩管下游的传质系数和腐蚀速率随着流速的增大而增大,峰值位置向流动方向移动;模拟结果和实验结果基本吻合。
The Fluent software is used to simulate the flow field distribution at downstream o f the sudden expansion pipeline. By changing the inlet velocity and the pipe expansion ratio, the distribution law o f the mass transfer coefficient at downstream o f the pipeline under different conditions is obtained. Based on the established m athem atical model, the change laws o f the mass transfer coefficient and corrosion rate at downstream o f the sudden expansion tube w ith the inlet velocity and pipe expansion ratio is obtained. The results show that, when the inlet velocity is constant, the mass transfer coefficient and corrosion rate at downstream o f the sudden expansion pipe increases w ith the sudden expansion ratio, and the peak position moves to the flow direction. W hen the pipeline sudden expansion ratio is constant, the mass transfer coefficient and corrosion rate at downstream o f the sudden expansion pipeline increase with the velocity, and the peak position moves to the downstream o f the pipeline. The simulation results are basically consistent w ith the experimental results.
作者
林彤
周克毅
司晓东
LIN Tong;ZHOU Keyi;SI Xiaodong(School of Energy and Environment,Southeast University,Nanjing 210096,China)
出处
《热力发电》
CAS
北大核心
2019年第4期41-47,共7页
Thermal Power Generation
基金
国家自然科学基金项目(51676035)~~
关键词
流动加速腐蚀
突扩管
流场分布
入口流速
腐蚀速率
突扩比
传质系数
flow-accelerated corrosion
sudden expansion pipeline
flow field distribution
inlet velocity
corrosion rate
sudden expansion ratio
mass transfer coefficient
