摘要
利用ANSYS FLUENT 16.0提供的欧拉两相流模型和标准k-ε湍流模型对市政供水管道掺杂气体的过程进行数值模拟,分析管段中气液两相的瞬态分布、管段沿中心线的瞬态流速分布、两相间的相互作用以及管段沿中心线压力的分布情况。结果表明,管段内气液两相的速度差是造成两相掺混的根本原因,并且导致水头损失增加、气液相互作用内能增加,从而使下游管段压力降低了约40%~80%。因此,可以通过监测下游管段压力降低程度,定性的分析监测点上游管段中气液掺混程度,从而预测爆管发生的可能性。管段中弯头部分存在空气滞留区即"死区",弯头角度由90°更改为135°时模拟管段中气液两相瞬态分布,结果表明死区可以基本消除。
The municipal water-feeding pipes mixed wi th air were numerical ly simulated by use of the models of Volume of fluid （VOF） multiphase flow and Standard k-e turbulence provided by AN- SYS FLUENT 16. 0 software. The transient distribution of gas-liquid two phase,flow velocity,as well as flow pressure along the axis line and the gas-liquid interaction were numerically analysed. The re-sults showed that the different flow velocity in gaseous or liquid phase obviously caused the gas-liquid mixing,and thereby led to the increase of head loss,aroused gas liquid interaction and decreased the pressure of downstream section of pipes about 40% ？ 8 0% . T h e re fo re,the pipe explosion could be pre-dieted by qualitative analysis of gas-liquid mixing degree in the upstream with monitoring the decrease of the pressure in downstream section of pipeline. The air retention in pipe elbow area was almost dis-appeared with the changed pipe elbow angle from 90° to 135° in simulating the gas-liquid two phase transient distribution of water-feeding pipe.
出处
《内蒙古工业大学学报（自然科学版）》
2017年第3期221-229,共9页
Journal of Inner Mongolia University of Technology：Natural Science Edition
基金
内蒙古自治区自然科学基金项目(MS0603)
