针对水平管道油水两相流流速的无扰动测量问题，提出一种基于超声/电学双模态传感器的流速测量方法。测量系统由连续波超声多普勒传感器和基于电容与电导的电学传感器构成，分别用于获取两相流流速和分相含率。由于连续波多普勒的测量区域集中于管道中心，受流速剖面、含率分布影响，所测得流速并非流体的总表观流速。在假设含率分布满足高斯分布的前提下，建立相含率加权的多普勒能量谱模型，将含率分布的影响因素引入总表观流速的测量，并建立总表管流速和分相表观流速的计算模型。在试验基础上，分别确定水连续和油连续时总表观流速计算模型的参数。试验表明，通过模型计算出的表观流速与实际测量的流速能够较好吻合，总表观流速的相对误差小于6.32%，分相表观流速的方均根误差小于5.64%。
For the overall superficial velocity non-disturbance measurement of oil-water two-phase flow in horizontal pipeline, a measurement method based on dual-mode of ultrasonic and electrical is proposed. A system combined continuous-wave ultrasonic Doppler sensors and conductance/capacitance sensors is used to estimate the velocity and holdup of two phase flow. Because the continuous-wave ultrasonic Doppler measurement region is concentrated in the pipe center, the holdup distribution and the velocity profile will lead to the difference between flow velocity obtained by Doppler shift and the overall superficial velocity. On the assumption that the holdup distribution satisfies Gauss distribution, establish the modified Doppler power spectrum model. The influence of the holdup is considered, then the models of calculating overall superficial velocity and phase superficial velocity are determined. Based on experiments, the parameters of the calculation model are determined respectively under different continuous phases. The experimental results show that the superficial flow velocities calculated by the model are in good agreement with the actual flow velocities. The relative error of the overall superficial velocity is less than 6.32%, and root mean square error of phase superficial velocity is within 5.64%.
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