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基于流体体积函数(VOF)模型,通过用户自定义标量方程(UDS),建立电导探针测量气-液两相流参数的基本模型。采用所建立的模型对垂直圆管气-液两相流双探头电导探针测量过程进行模拟,得到气泡流动过程中探针外部空间的电场分布。模拟结果显示:气泡通过探针时会引起的电流电压的巨大变化;电流电压分布不受噪声信号、气泡形状变化以及电流电压信号响应滞后的影响。通过模拟得到,当气泡经过探针时会产生电流和电压的近方波信号,该结果能真实反映探针测量气-液两相流的基本过程。
Based on the fluid volume function (VOF) model, a basic model for measuring parameters of gas-liquid two-phase flow by conductance probe was established by user-defined scalar equation (UDS). The established model was used to simulate the measurement process of vertical pipe gas-liquid two-phase flow probe with two probes, and the electric field distribution in the outer space of the probe during bubble flow was obtained. The simulation results show that the voltage and current of the bubble change greatly when the bubble passes through the probe. The current and voltage distribution are not affected by the noise signal, the shape of the bubble and the response lag of the current and voltage signals. By simulation, when the bubble passes through the probe, current and voltage near-square wave signals are generated, which can truly reflect the basic process of the probe in measuring gas-liquid two-phase flow.