基于电容层析成像技术的两相流可视化测量仪器

针对油水两相流参数测量问题,依据二重积分微元原理建立了油水两相流分布信息的数学模型,采用一种具有抗杂散电容的测量电路和80C32单片机完成了极板间电容的测量和采集系统的控制,组建了一套8电极油水两相流电容层析成像测量系统,系统采用了自适应阈值的图像重建的方法完成了油水两相流的截面图像的重建和油水两相流含水率的计算,其重建精度在1%左右,满足了油水两相流流型识别的要求,为油水两相流参数的可视化测量提供一种新方法.

Visualized Measurement Instrument of Two-Phase Flow Based on Electrical Capacitance Tomography Technique

To aim at measurement problem of parameters for ECT system of oil-water two-phase flow, the mathematic model of the oil-water two-phase distribution information is established based on double integral infinitesimal principle. An ECT measurement system of 8-electrode oil-water two-phase flow is set up that is comprised of a measurement circuit with stray-capacitance-resistance and a 80C32 SCM, both of which controls the measurement among the pole plates and the capture system. The image reconstruction for oil-water two-phase cross-sectional image and the calculating of oil-water two-phase water content can be accomplished by an adaptive threshold image reconstruction algorithm, and the precision of reconstruction is about 1%, which can meet the need of identification of flow regime for oil-water two-phase flow. Therefore, it offers a new method for the visualized measurement of oil-water two-phase flow parameters.