管道阀门对液体流动特性影响的数值研究

doi:10.3969/j.issn.1000-1158.2020.Z1.04

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参考文献(18)
相关文章 (15)

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摘要为研究管道阀门开度对管内流体流动特性的影响,采用CFD方法对带阀门的圆形管道开展3D建模计算,并应用动网格技术实现管道中阀门的开关过程。首先,对阀门全开状态下的圆管流动进行数值模拟,并与文献中的实验数据进行对比,结果表明采用标准 k-ε湍流模型得到的模拟结果与实验值最接近。在此基础上,进一步计算不同阀门开度下,圆管截面的流场分布特性。模拟结果表明:阀门开度的变化会对下游流场产生明显影响,但该影响会随着距离的增加逐渐减弱,直至临界距离处。在阀门下游,管道截面存在高流速与低流速的明显分层,对于不同阀门开度,流速分层形态不同。随着开度的减小,临界距离先增大后减小,最大值出现在开度50%处。

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	季杰强
	郑建英
	余松青
	吴晓杰
	程乐鸣

关键词 ：计量学, 水流量, 阀门开度, CFD模拟, 流场

Abstract：To investigate the influence of valve opening on the flow characteristics, the 3D calculations are carried out to simulate a circular pipe containing a ball valve by CFD method. The opening and closing process of the valve are modeled by the dynamic grid technology. Firstly, the flow characteristics inside the pipe with the valve fully opening are studied, and the results are compared with the experimental data from literature. It shows that using the standard k-ε turbulence model could get more accurate results. Furthermore, the flow field distributions at different valve opening degrees are investigated. The simulation results show that the change of valve opening degree has obvious influence on the downstream flow field. However, the disturbance will gradually weaken along the flow direction, and the flow field return to uniform distribution at the critical distance. Flowing through the valve, the liquid flow is separated to form a high velocity region and low velocity region at the cross section. For different valve opening degree, the flow velocity stratification is different. With the decrease of opening degree, the critical distance first increases and then decreases, and the maximum critical distance appears at 50% opening degree.

Key words： metrology liquid flow valve opening CFD simulation flow field

PACS:

TB937

基金资助:浙江省市场监督管理局NQI项目(20190105)

通讯作者: 郑建英(1962-), 浙江鄞县人,浙江省计量科学研究院教授级高级工程师, 国家一级计量师, 主要从事流量计量方面的研究。Email: jianying_z@163.com

作者简介: 季杰强(1991-),浙江兰溪人,浙江省计量科学研究院博士后,研究方向为液体流量计量。Email: jjqq@zju.edu.cn

引用本文:

季杰强,郑建英,余松青,吴晓杰,程乐鸣. 管道阀门对液体流动特性影响的数值研究[J]. 计量学报, 2020, 41(12A): 16-21.
JI Jie-qiang,ZHENG Jian-ying,YU Song-qing,WU Xiao-jie,CHENG Le-ming. Numerical Study on The Influence of Pipeline Valves on Liquid Flow Characteristics. Acta Metrologica Sinica, 2020, 41(12A): 16-21.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2020.Z1.04 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2020/V41/I12A/16

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