两相流相关测速内外环电容传感器灵敏度

为了设计应用于两相流相关流速测量的内外环电容传感器,优化内外环电容传感器的结构 ,借助有限元仿真的方法对内外环电容传感器的灵敏度特性进行分析,利用正交实验设计方法来安排仿真实验。分析仿真实验结果,得到了影响传感器灵敏度特性指标（传感器相对灵敏度和检测场均匀性误差）的主要因素以及各个因素对这两个指标的影响程度和影响趋势,优选出一组传感器的结构参数,为内外环电容传感器的设计提供了理论依据。     

基于ANSYS的气/液两相流电容相关流速测量仿真研究

以气/液两相流互相关测量系统为研究对象,采用MATLAB建模仿真方法,研究由电容传感嚣构成的基于离散相浓度的电容互相关流速测量机理.并针对电容传感器的"软场"特性,利用ANSYS软件分析电容传感器与离散相浓度的关系,采用Monte-Carlo方法建立气/液两相流流动模型,研究"凝固流动图型"、"非凝固流动图型"以及速度...     

基于静电与电容集成传感器的密相气力输送煤粉流动参数在线测量研究

提出了一种静电与电容传感器集成测量系统,用于监测低压下密相气力输送煤粉颗粒的流动参数(速度、浓度和质量流量)。在该系统中,环状静电传感器用于颗粒速度测量,螺旋电容传感器用于颗粒浓度测量。在不同工况下,对煤粉颗粒的流动参数进行了测量,并系统研究了输送系统运行参数(角阀开度、流化风量、补充风量和给料罐压力)对煤粉颗粒速度、浓度和质量流量的影响。结果表明,该系统能够对密相气力输送煤粉颗粒流动参数进行可靠的在线测量。     

气固两相流电容相关流量测量仿真研究

以气/固两相流互相关测量系统为研究对象,采用计算机仿真的方法,对由电容传感器构成的基于离散相浓度的电容互相关流速测量机理进行研究。利用ANASYS软件分析电容传感器与离散相浓度的关系;采用Monte-Carlo方法,建立气/固两相流动模型;研究＂凝固流动图型＂、＂非凝固流动图型＂,离散相浓度、粒度及速度分布对互相关测量系统的影响。     

气液两相流电容传感器相浓度测量特性

为了考察两种电容传感器(对壁式及双螺旋式)测量气液两相流相浓度的适应性,搭建了垂直上升气液两相流电容传感器测量系统。实验表明对壁式电容传感器测量分辨率较差,而双螺旋式电容传感器对相浓度具有较高的分辨能力。采用时频分析方法对电容传感器波动信号进行了分析,发现两种电容传感器的时频联合表达均能清晰地表征流型运动特征,并可对流型进行有效辨识。最后,基于双螺旋式电容传感器测量信号,建立了气液两相流漂移模型,取得了对段塞流和混状流分相表观流速较好的预测结果。研究表明,双螺旋式电容传感器在气液两相流流动参数测量上具有较好的应用前景。     

气固两相流固相浓度与流速的测量及可视化

气固两相流固相流率的测量是测试领域的难点之一,为了实现气固两相流固相浓度与流速的测量,阐述了电容层析成像的原理,搭建了气固两相流实验台,固相选用聚丙烯颗粒,气相为空气,固相依靠自身的重力流经实验装置,利用ITS公司的M3C电容层析成像装置对气固两相流的固相浓度、速度、质量流量进行了测试研究。实验中的浓度测量采用图像的介电常数分布像素,速度测量选择双层结构的电容传感器,利用相关测速原理,计算上下游传感器成像像素的相关性,最后由测得的速度及浓度分布计算出质量流量,测量结果与重力传感器测量的质量流量结果进行了对比,结果具有较好的一致性,测量误差小于10%,表明利用电容层析成像系统可对气固两相流参数的测量。     

分瓣式电容角位移传感器的优化设计

基于三维电场有限元分析方法，实现分瓣式电容角位移传感器的仿真研究，并对其结构参数进行优化设计，样机物理实验结论与仿真实验结论相吻合。     

相位法含水率测量传感器的模型研究

相位法原油含水率测量方法是基于同轴线传感器的一种测量方法,同轴线传感器的结构与参数对测量准确性有着重要影响。利用ANSYS HFSS电磁仿真软件研究同轴线传感器的设计优化方法,分析同轴线内导体的长度对传感器性能的影响,依据仿真结果,确定传感器的优化参数。仿真结果证明了相位法原油含水率测量的有效性和可行性。     

电容层析成像系统标定方法与参数修正

在实际的气 /固两相流应用中 ,对于最高固相浓度较低场合 ,需对量程做调整 ,而由于受传感器绝缘管壁的影响 ,其量程变化与固相含率并非为线性 ,采用求解管壁和内腔电容的方法可实现对系统量程的调整。另外对系统零点的跟踪 ,在传感器少量磨损的情况下可实现对系统测量的局部修正以提高系统检测精度 ,仿真实验表明 :利用系统零点的跟踪数据提高电容检测精度具有一定的效果 ,同时可利用相隔 1电极电容的变化量实现对系统再标定需求的指示     

螺旋表面极板电容式传感器的灵敏场分析

气固两相流质量流量的检测和控制是工业上长期未能有效解决的难题。从工业角度出发,采用电容层析成像技术建立了一种改进型螺旋表面极板电容式传感器。通过有限元仿真的方式,分析了极板张角、管壁介电常数、管壁厚度对灵敏场分布和均匀性误差参数的影响。通过仿真分析,确定了各传感器模型参数的取值范围,为灵敏场分布的改善、传感器的优化设计和传感器系统性能的提高提供了必要的理论基础。     

Liquid holdup measurement with double helix capacitance sensor in horizontal oil-water two-phase flow pipes

This paper presents the characteristics of a double helix capacitance sensor for measurement of the liquid holdup in horizontal oil–water two-phase flow. The finite element method is used to calculate ...     

双螺旋电容传感器水平油水两相流液相持率测量特性(英文)

This paper presents the characteristics of a double helix capacitance sensor for measurement of the liquid holdup in horizontal oil–water two-phase flow. The finite element method is used to calculate the sensitivity field of the sensor in a pipe with 20 mm inner diameter and the effect of sensor geometry on the distribution of sensitivity field is presented. Then, a horizontal oil–water two-phase flow experiment is carried out to measure the response of the double helix capacitance sensor, in which a novel method is proposed to calibrate the liquid holdup based on three pairs of paral el-wire capacitance probes. The performance of the sensor is analyzed in terms of the flow structures detected by mini-conductance array probes.     

The Finite Element Analysis for Parallel-wire Capacitance Probe in Small Diameter Two-phase Flow Pipe

This paper presents a novel capacitance probe, i.e., parallel-wire capacitance probe (PWCP), for two-phase flow measurement. Using finite element method (FEM), the sensitivity field of the PWCP is investigated and the optimum sensor geometry is determiend in term of the characterisitc parameters. Then, the response of PWCP for the oil-water stratified flow is calculated, and it is found the PWCP has better linearity and sensitivity to the variation of water-layer thickness, and is almost independant of the angle between the oil-water interface and the sensor electrode. Finally, the static experiment for oil-water stratified flow is carried out and the calibration method of liquid holdup is presented.     

有机硅酸酯薄膜SO2气体传感器

采用溶胶-凝胶法和自旋涂覆技术在二氧化硅为基材的梳状电极电容器（IDC）上形成有机硅酸酯的气敏涂层.在室温和0.1 kHz、1 kHz、10 kHz频率下测定了该电容器的电容，实验表明其电容的改变值和气氛中二氧化硫(SO₂)浓度的变化呈线性关系，亦与测量时使用的频率和气敏涂层的厚度密切相关.在本实验条件下，经有机改性的N,N-二乙基氨丙基三甲氧基硅烷比同类的硅酸酯对SO2有更高的灵敏度.     

A NEW EXPERIMENTAL CORRELATION USING A CURVE-SHAPED CAPACITANCE SENSOR TO PREDICT LIQUID HOLDUP IN VERTICAL GAS-CONDENSATE PIPELINES

The performance of a curve-shaped capacitance sensor for measuring the mean liquid holdup of the two-phase mixture of gas-condensate and nitrogen in a vertical pipeline was studied experimentally. The sensor consists of two electrodes placed on the external wall of a cylindrical test duct. The calibration curves for bubble, slug, and plug flow regimes were developed for vertical flow and the sensitivity of the sensor to flow pattern was also investigated. Based on experimental observations, different calibration curves must be used for different flow regimes to have an acceptable accuracy in holdup measurement. Moreover, a new empirical correlation for estimating liquid holdup in vertical gas-condensate pipelines in the dynamic condition was developed as a function of superficial velocities, viscosities, and densities of the gas and liquid. Furthermore, a flow pattern identification map for vertical pipeline is also presented.     

A NEW EXPERIMENTAL CORRELATION USING A CURVE-SHAPED CAPACITANCE SENSOR TO PREDICT LIQUID HOLDUP IN VERTICAL GAS-CONDENSATE PIPELINES

The performance of a curve-shaped capacitance sensor for measuring the mean liquid holdup of the two-phase mixture of gas-condensate and nitrogen in a vertical pipeline was studied experimentally. The sensor consists of two electrodes placed on the external wall of a cylindrical test duct. The calibration curves for bubble, slug, and plug flow regimes were developed for vertical flow and the sensitivity of the sensor to flow pattern was also investigated. Based on experimental observations, different calibration curves must be used for different flow regimes to have an acceptable accuracy in holdup measurement. Moreover, a new empirical correlation for estimating liquid holdup in vertical gas-condensate pipelines in the dynamic condition was developed as a function of superficial velocities, viscosities, and densities of the gas and liquid. Furthermore, a flow pattern identification map for vertical pipeline is also presented.     

基于旋转分相单元的电容式气液两相流含液率测量

为提高电容器对含水率测量的能力,设计与其相匹配的旋转分相单元,以实现气液两相流含水率的起旋分相式电容测量。在电容传感器的测量单元基础上,增加旋转分相单元,利用气液两相流体力学理论对其结构进行设计优化,并根据实际应用条件确定分离圈数,保证气液分相效率。旋转分相单元克服了气液两相流流动形态的多样性,将体积含水率信息转换成液膜厚度信息及截面含水率信息进行测量。经实验验证,Lockhart-Martinelli截面含气率模型与实验中电容器测量截面含气率具有良好的一致性,其能够实现对体积含水率20%以内的气液两相流有效测量,体积含水率的绝对误差在±2%以内。