Abstract: A new method based on electrical capacitance tomography (ECT) in conjunction with the ant system was proposed to measure the void fraction of oil-gas two-phase flow.The 12-electrode capacitance sensor of ECT system could obtain 66 measured capacitance values.The void fraction measurement model parameters f and b, which were obtained by the least square method in advance, were determined according to the flow pattern that was first identified by the ECT system.Then the most important combined capacitance set which had decisive influence on the void fraction of a given state of measurement was obtained based on the ant system, and the corresponding pheromone of the ant system was regarded as the weight of this set.The capacitance set and its weight were simultaneously input to the measurement model to obtain the void fraction.The experimental results showed that the proposed method for the void fraction measurement was effective under different flow patterns owing to avoidance of complex image reconstruction and good real-time performance.The maximum error was less than 5.5% as compared with the quick closing valve method, and the measurement time was within 0.08 s.

摘要： 基于电容层析成像系统（ECT）和蚂蚁算法，提出了一种油气两相流空隙率在线测量的新方法。该方法利用电容层析成像系统12电极电容传感器所获取的66个测量电容信息，首先根据电容层析成像系统所获取的流型辨识结果确定对应流型下的实际空隙率测量模型参数f和b，然后利用蚂蚁算法的信息素信息，找到当前测量状态下对空隙率起主要作用的组合电容集合和相应的权重系数，从而实现空隙率测量。与流型相对应的空隙率测量线性模型参数f和b基于先验数据通过最小二乘方法确定。油气两相流的实验结果表明，该方法对空隙率的在线测量是有效的，避免了复杂的图像重建计算，实时性能佳，测量时间小于0.08 s。在几种典型流型下，提出的空隙率测量方法与常用的快关阀方法相比最大测量偏差小于5.5%。