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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第3期    总第283期    2018年3月

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文章编号:1672-7207(2018)03-0618-08
用于气固两相流测量的方形静电传感器阵列建模及实验验证
张帅1,闫勇1, 2,钱相臣1,胡永辉1

(1. 华北电力大学 控制与计算机工程学院,北京,102206; 2. 肯特大学 工程与数字艺术学院,英国 肯特,CT2 7NT)

摘 要: 为研究由分布式条形电极组成的方形静电传感器阵列检测机理,基于静电学基本理论及镜像电荷法建立方形静电传感器阵列的解析式感应机理数学模型;基于该模型,采用点电荷模拟带电颗粒,研究在管道内不同区域处的移动带电颗粒激励下,静电传感器阵列中不同电极的感应电荷及感应电流输出特性。为验证数学模型,设计并搭建方形管道重力输送颗粒实验装置。方形静电传感器阵列包含2层分布式条形电极组,每层条形电极组中12个(3×4)条形电极均匀分布在方形管段截面的四面管壁上。控制颗粒在管道横截面不同位置下落,研究静电传感器阵列输出特性。研究结果表明:方形静电传感器阵列各电极的感应输出结果与仿真结果趋势一致,证明了数学模型的有效性。

 

关键词: 气固两相流;方形管道;静电传感器;数学建模;镜像电荷法

Mathematical modeling and experimental evaluation of square-shaped electrostatic sensor arrays for gas–solid two-phase flow measurement
ZHANG Shuai1, YAN Yong1, 2, QIAN Xiangchen1, HU Yonghui1

1. School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, China; 2. School of Engineering and Digital Arts, University of Kent, Kent CT2 7NT, UK

Abstract:To study the sensing mechanism of square-shaped electrostatic sensor arrays that compose of distributed strip-shaped electrodes, a mathematical model was proposed based on electrostatics theory and image method. Through simulating a moving point charge with different moving paths, the induced charge and current of different electrodes in the sensor arrays were derived from the proposed model. A gravity-fed particle flow test rig with a square-shaped pipe section was designed and constructed to evaluate the mathematical model. The square-shaped electrostatic sensor arrays were composed of two layers of strip-shaped electrodes, and 12 (3×4) strip-shaped electrodes were uniformly embedded in four flat pipe walls in each layer. By changing particle’s position across the pipe section, outputs of different electrodes in the sensor arrays were obtained accordingly. The results show that experimental results are in line with simulation results from mathematical model, which indicates that the proposed model is effective in practice.

 

Key words: gas–solid two-phase flow; square-shaped pipe; electrostatic sensor; mathematic modeling; method of images

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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