压力管道局部高点滞留气团排气过程的CFD计算及PIV试验
CFD calculation and PIV test of exhaust process of trapped air mass at local high point of pressure pipeline
陈奇 1刘霞 1常正柏 2张白云 2赵亮 2蒋劲2
作者信息
- 1. 湖北省水利水电科学研究院,湖北武汉 430072;湖北省国际灌排研究培训中心,湖北武汉 430072
- 2. 武汉大学动力与机械学院,湖北武汉 430072
- 折叠
摘要
采用重整化群(renormalization group,RNG)理论k-e湍流模型以及流体体积(volume of fluid,VOF)函数气液两相流模型对有压管道局部高点滞留气团的排出进行数值模拟,计算出气泡开始出现破碎的临界流速v1、气泡开始有效破碎且小气泡被带走的临界流速v2以及气泡被一次性带走的临界流速v3.此外,通过粒子图像测速(particle image velocimetry,PIV)系统测试了 3种临界速度下的流场结构.研究表明:有压管道下降角度增大,3种临界流速均增大;随着滞留气团的体积变大,临界流速v1减小,而临界流速v2和v3均增大;在管道直径、下降角、气量均不变的情况下,临界流速v3比v2大2％～10％,但临界流速v1远小于v2.
Abstract
In the paper,the RNG(renormalization group theory)k-ε turbulence model and the VOF(volume of fluid)gas-liquid two-phase flow model are used to numerically simulate the discharge of trapped air masses at local high points in a pressurized pipeline.The critical flow velocity v1 when the bubbles begin to break,the critical flow rate v2 when the bubbles begin to break effectively and small bubbles are taken away,and the critical flow velocity v3 when the bubbles are taken away instantaneously are calculated.In addition,the flow field structure at the three critical velocities is tested by the PIV(particle image velocimetry)system.The results show that with the increase in the angle of descent of the pressure pipeline,the three critical velocities increase.As the volume of the trapped air mass increases,the critical velocity v1 decreases,while the critical velocities v2 and v3 both increase.When the pipe diameter,descent angle and the air volume are constant,the critical flow velocity v3 is 2％-10％larger than v2,but the critical flow velocity v1 is much smaller than v2.
关键词
气液两相流/管道局部高点/滞留气团排气/CFD计算/VOF模型/PIV试验Key words
gas-liquid two-phase flow/local high point of pipeline/exhaust of trapped air mass/CFD calculation/VOF model/PIV test引用本文复制引用
基金项目
湖北省财政项目(2020-P21800600002)
出版年
2024
NETL
NSTL
万方数据