CIESC Journal ›› 2021, Vol. 72 ›› Issue (9): 4573-4583.DOI: 10.11949/0438-1157.20210098

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Investigation of visualized-measurement merits of wire mesh sensor for gas-liquid flow

Hai ZHANG1,2(),Ying XU1,2(),Tao ZHANG1,2,Cenwei SUN1,2,Chuanshun WEI1,2,Zhixiang DAI3   

  1. 1.School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
    2.Key Laboratory for Process Measurement and Control, Tianjin 300072, China
    3.Petro China Southwest Oil & Gasfield Company, Chengdu 610051, Sichuan, China
  • Received:2021-01-15 Revised:2021-04-30 Online:2021-09-05 Published:2021-09-05
  • Contact: Ying XU

丝网传感器的气液两相流可视化测量特性研究

张海1,2(),徐英1,2(),张涛1,2,孙涔崴1,2,魏传顺1,2,戴志向3   

  1. 1.天津大学电气自动化与信息工程学院,天津 300072
    2.天津市过程检测与控制重点实验室,天津 300072
    3.中国石油天然气股份有限公司西南油气田分公司,四川 成都 610051
  • 通讯作者: 徐英
  • 作者简介:张海(1995—),男,硕士研究生,Zhanghai_t@163.com
  • 基金资助:
    国家重点研发计划项目(2018YFF01013802);天津市自然科学基金项目(18JCZDJC31600)

Abstract:

Regarding the visual measurement capability of the wire mesh sensor (WMS), a variety of fluid visualization techniques were used to conduct research and evaluation. Numerical simulation has attracted wide attentions due to its advantages of low cost, flexibility and diversity. However, the research based on transient flow-field and electric-field coupling simulation to investigate the merits of WMS is rarely reported. For the 16×16-electrode conductivity WMS with spatial resolution of 3.125 mm, the flow-field and electric-field coupling principle, which is based on the linear relationship between the local conductivity of measured medium in electric field and phase holdup of fluid, is proposed. Furthermore, the simulations of stratified flow, annular flow and slug flow of gas-liquid flow and corresponding coupling calculations are carried out with the relative interface of COMSOL. And coupling results such as the reconstructed images according to WMS measurements and the current density distribution are in complete agreement with real gas-liquid distribution, which proves the excellent visualized merits of WMS and validates the feasibility of the coupling principle. Besides, the static experiment of air-water stratified flow with different liquid level and corresponding simulations were made. Meanwhile, the WMS measurements were collected respectively. The favorable agreement between reconstructed images derived from normalized WMS measurements with corresponding static flow validates the reliability of the simulation model adopted in this paper. In addition, it also confirms that the normalized processing for the WMS measurements can effectively correct nonlinear mapping between the real fluid distribution and the measurements of “crossing point” around the WMS edges because of edge electric field distortion, which ensures a consistent linear mapping between the two over the entire measured cross-section of WMS.

Key words: imaging using wire mesh sensor, gas-liquid flow, flow-field and electric-field coupling, edge electric field distortion, normalized processing

摘要:

关于丝网传感器(WMS)可视化测量能力已有学者采用多种流体可视化技术进行了研究评估,数值仿真方法以其低成本、灵活多样优势受到了广泛关注,但瞬态流场-电场的WMS耦合仿真评估鲜有报道。针对空间分辨率3.125 mm,16×16电导型WMS,基于电场域中被测介质局部电导率与流体相含率的线性关系提出了流场-电场耦合方法。采用COMSOL实现了分层流、环状流和段塞流的气液两相流体仿真以及相应的耦合计算,结果表明WMS测量重构图、电流密度模值分布等信息与真实气液相分布严格对应,证明WMS具有出色的可视化测量能力和耦合方法的可行性。此外采集了不同液位高度静态分层流WMS实验数据,并与仿真数据进行分析对比,二者测量归一化值重构图与静态流体分布相吻合,表明了仿真模型的可靠性,以及测量值归一化处理能有效修正因WMS“边缘电场畸变”造成的边缘点测量值与流体分布之间的非线性映射关系,确保整个横截面上两者之间的一致线性映射。

关键词: WMS成像, 气液两相流, 流场-电场耦合仿真, 边缘电场畸变, 归一化

CLC Number: