静电传感器灵敏场有限元仿真研究  

Finite element analysis of the sensing field of electrodynamic sensor

作　　者：许传龙[1] 汤光华[1] 杨道业[1] 周宾[1] 潘琦[1] 邵理堂[1] 王式民[1] 

机构地区：[1]东南大学洁净煤发电与燃烧技术教育部重点实验室,南京210096

出　　处：《仪器仪表学报》2007年第7期1311-1318,共8页Chinese Journal of Scientific Instrument

基　　金：国家重点基础研究专项经费(2004CB17702-04)资助项目

摘　　要：静电传感器灵敏场分布不均匀,致使传感器的输出受流型影响,导致较大的测量误差。本文基于点电荷思想建立了圆环状静电传感器的三维静电场数学模型,并应用有限元法进行了数值求解。系统地分析了圆环状静电传感器结构参数(电极的长度、绝缘管段的厚度、屏蔽罩的长度以及半径等),材料特性以及场域介质分布对静电传感器灵敏场分布特性的影响。旨在为实现静电传感器灵敏场的均匀分布和结构优化提供理论依据。The sensing field of electrodynamic senor is inhomogeneous due to its non-linear sensing mechanism. As a result, the output of the sensor is seriously influenced by flow pattern, which may cause measurement error of particle flow parameter. In this paper, based on point charge principle the mathematic model of the 3-dimensional electrostatic field generated by a ring-shaped electrodynamic sensor is established, and the 3 dimensional electrostatic field in the sensing zone of the sensor is solved using finite element method. The effects of structure parameters and material characteristics of the electrodynamic sensor （such as the length of the electrode, the thickness and permittivity of dielectric pipe, the length and radius of metal screening） and permittivity distribution in the sensing zone on the sensing field distribution characteristic of the electrodynamic sensor are investigated systematically, which provides a theoretical basis for the performance improvement and design optimization of the sensor.

关 键 词：灵敏场静电传感器 气-固两相流 颗粒静电化 有限元分析 

分 类 号：TK934[动力工程及工程热物理]