新型插入式电磁流量计流场适应性研究

Study on Flow Field Adaptability of New Inserted Electromagnetic Flowmeter

插入式电磁流量计工作原理是基于法拉第电磁感应定律,管道中气体、液体介质流经传感器探头时切割磁感线,引起磁感应电动势,因此探头周边流场的分布情况对流量计的测量结果会产生比较大的影响。文中采用Fluent流体仿真软件对电磁流量计传感器的多种几何模型进行仿真分析,观察传感器在流场中形成的高速绕流区域和边界层,研究传感器周边流场变化给电极带来的影响。提出将传感器的物理结构进行优化,将传感器的探头位置设计安装于传感器两边,并将圆柱体的物理结构模型改成椭圆型和椭圆水滴型。通过进一步建模仿真发现,椭圆水滴型传感器测量的信号强度更强、稳定性也较高。

The working principle of the inserted electromagnetic flowmeter is based on Faraday’s law of electromagnetic induction, when the gas or liquid medium passes through the sensor probe, the magnetic induction line is cut and the magnetic induction electromotive force is generated. Therefore, the distribution of the flow field around the probe will have a great influence on the measurement results of the flowmeter. In this paper, fluent fluid simulation software is used to simulate and analyze various geometric models of electromagnetic flowmeter sensors. The high-speed flow around the sensor and the boundary layer are observed, and the influence of the flow field around the sensor on the electrode is studied. The physical structure of the sensor is op-timized;the probe position is designed and installed on both sides of the sensor, and the physical structure model of the cylinder is changed into elliptical and elliptic water drop type. Through further modeling and simulation, it is found that the signal intensity and stability of elliptic water drop sensor are higher.