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Experiment and Analysis of Flow Field in a Wire-Duct Type Electrostatic Precipitator

线管式静电除尘器流场实验与分析

基本信息

批准号：
61550217
负责人：
ADACHI Takayoshi
金额：
$ 1.41万
依托单位：
Oita university
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550217/
关键词：
Electrostatic precipitator Corona discharge Ionic wind 電気流体力学

项目摘要

1. Analysis of corona discharging electric field : A new method of solving the equations that describe the space charge field in a wire-duct type electrostatic precipitator is presented. The theoretical values of corona current-voltage characteristics, coronacurrent density and electric field distributions on the plate are calculated by the new method and are in good agreement with the measured values. This method is used to find the distributions of potential, charge density and electric field in the gas space between the discharge and plates.2. Analysis of flow in ESP : The effects of corona discharge on the flow field are numerically analyzed on the basis of Navier-Stokes equations with external force as Coulomb force density and the continuity equation. Time-dependent vorticity is calculated by alternating direction implicit method while Poisson equation for vorticity and stream function by finite element method. As a result, the characteristics of electrohydrodynamic flow field are clearly obtained as a function of electrohydrodynamic number which is defined as a ratio of characteristic ionic wind velocity and inlet flow velocity.3. Experiment of flow field in ESP : The flow field in ESP is visualized and photographed by Schilieren method. As a result, the effects of both on the flow field in ESP and of vortex near collecting plate electrode are clearly observed in the experiment. It is found that the similarity law concerning to flow field in ESP holds : the patterns of flow field are nearly similar for the same electrohydrodhnamic number.

1.电晕放电电场分析：提出了一种求解线槽式电除尘器空间电荷场方程的新方法。用该方法计算了电晕电流-电压特性、电晕电流密度和极板上电场分布的理论值，与实测值吻合较好。该方法用于求解放电与极板之间气体空间的电势、电荷密度和电场分布.电除尘器内流动分析：基于以库仑力密度为外力的Navier-Stokes方程和连续性方程，数值分析了电晕放电对流场的影响。含时涡量采用交替方向隐式方法计算，涡量和流函数的泊松方程采用有限元方法计算。结果表明，电流体动力学流场的特性是电流体动力学数的函数，电流体动力学数定义为特征离子风速与入口流速的比值.电除尘器内流场实验：采用希列伦法对电除尘器内流场进行了可视化和拍照。实验结果表明，两者对电除尘器内流场的影响以及极板附近涡流的影响都很明显。发现电除尘器内流场的相似规律是：电液动力数相同时，流场形态基本相似。