内外环电容传感器灵敏度仿真

为设计应用于两相流相关流速测量的电容传感器,得到传感器的几何参数对其灵敏度特性的影响,利用数值方法对内外环电容传感器的灵敏度特性进行分析.利用有限元分析软件建立传感器电场的仿真模型并进行了基本仿真,采用正交实验设计方法安排仿真实验.分析结果表明,屏蔽罩长度和内管壁厚度是影响传感器相对灵敏度的主要因素,而屏蔽罩与外极板间距对检测场均匀性误差影响比较大.优选出一组传感器的结构参数,内管壁厚度3 mm,外管壁厚度2 mm,屏蔽罩与外极板间距3 mm,对管壁相对介电常数的要求则是越接近于1越好.利用优选的结构参数进行仿真,可以得到比较好的传感器灵敏度特性,为内外环电容传感器的设计提供了理论依据.

内外环电容传感器空间灵敏度特性

为了设计应用于两相流相关流速测量的电容传感器,研制了一种新型的内外环电容传感器,利用有限元仿真的方法对内外环电容传感器的轴向灵敏度、空间滤波特性以及时间频率响应3个空间灵敏度特性指标做了定量分析.结果显示,内外环电容传感器的轴向灵敏度曲线近似于高斯分布,而电极宽度的变化会引起轴向灵敏度峰值的改变,当电极宽度为20,mm时,轴向灵敏度峰值最大;内外环电容传感器相当于一个低通滤波器,电极宽度增加,空间频带变窄,同时时间频带也变窄.

两相流相关测速内外环电容传感器灵敏度

In order to design the inner and outer ring capacitance sensor used in measuring the correlation velocity of two phase flow and optimize its structure,the sensitivity characteristics of inner and outer ring capacitance sensor were analyzed by using finite element simulation.The simulation experiment was planned by using orthogonal experimental design.From the simulation result,the major factors influencing the sensitivity characteristics(relative sensitivity and uniformity error) were obtained.The degree and tendency of influence of each factor on the sensitivity characteristics were given.The structural parameters of the sensor were determined.The analysis provided the theoretical basis for the inner and outer ring capacitance sensor.