【摘要】 本文介绍了两相流浓度测量电容传感器的几种场灵敏度定义方法,数学模化过程中的影响因素,给出不同网格有限元计算结果,分析了介质加入电场的影响,提出了灵敏度及灵敏度变化量参数的合理计算方法,并利用仿真计算进行了验证更多还原

【Abstract】 This paper introduces several sensitivity distribution calculation methods often used in electrical capa citance sensors for measuring the concentration of two-phase flows Some results from different meshes are demonstrated The main factors influencing the sensitivity calculation in mathematical modeling procedures are presented The effect of dielectric polarization in electrostatic field is analyzed and a reasonable calculating method is provided Two-phase flows are common in metallurgical industry, chemical industry, light industry and energy industry Mathematical descriptions of their complicated flow patterns are very difficult and most of them are impossible Experiments and practical measurements are the bases of two-phase flow study Electrical capaitance sensors along with measurement circuits have the advantages of simple in construction, non-intrusive, safe in usage, fast in dynamic response, suitable for many materials, therefore they have primary applications in industrial measurement but the sensitive fields of electrical capacitance are not uniform, the sensitivity distributions must be known while using them However, it is inexpedient that sensitivity distributions of all sensors are always obtained by practical measurement for optimization purpose A mathematical method based on finite element method (FEM) is usually adopted to calculate the data needed In this paper, different calculating methods of sensitivities used in average concentration and concentration distribution measurement are introduced and compared The influences of varied meshing manner during calculation procedure are presented and a reasonable calculating method is proposed更多还原