基于强制环状流的往复式动态电导传感器的持液率测量

利用传统电导法测量气液两相流持液率时，测量精度和测量范围往往要受到流型和矿化度的影响。为此，提出一种在强制环状流状态下，利用往复式动态电导探针测量持液率的方法。测量装置由旋流器、电导探针、探针自动往复移动装置和数据采集处理系统等组成。该测量方法一方面将流型调整为强制环状流，使测量结果不受复杂多变的气液流型的影响；另一方面，仅仅根据电路的通断来确定液膜厚度，而不依赖具体的电导率大小，因此可以克服矿 化度对测量结果的影响。通过数值模拟研究，标定了动态电导传感器对液膜进行测量的位置位于旋流器下游约6D处；通过室内实验验证了装置的可行性，结果表明：在气相表观流速5~20m·s-1，液相表观流速0.079~0.48m·s-1的实验参数范围内，持液率最大偏差为10.45%。

Liquid Holdup Measurement of a Reciprocating Dynamic Conductance Sensor Based on Forced Annular Flow

Traditional conductivity method for measuring the liquid-holding rate of gas-liquid two-phase flow is often affected by the flow pattern and salinity, resulting in reduced measurement accuracy and range. To overcome these limitations, a method for measuring liquid holdup using a reciprocating dynamic conductivity probe under forced annular flow conditions has been proposed. The measurement device consists of a cyclone, conductivity probe, automatic probe reciprocating system, and data acquisition and processing system. This measurement method adjusts the flow pattern to forced annular flow, eliminating the influence of complex and variable gas-liquid flow patterns on the measurement results. Additionally, the thickness of the liquid film is determined solely based on circuit continuity rather than specific conductivity values, thus overcoming the impact of salinity on the measurement. Numerical simulations were used to determine that the dynamic conductivity sensor should be located approximately 6D downstream of the swirl generator for measuring the liquid film. Laboratory experiments were conducted to verify the feasibility of the device, and the results showed that within the experimental parameter range of gas phase superficial velocities of 5-20m·s-1 and liquid phase superficial velocities of 0.079-0.48m·s-1, the maximum deviation of liquid holdup was 10.45%.