超声多信号融合表征颗粒两相流实验研究

Experimental research on characterizing particulate two-phase flow with ultrasonic multi-signal combination method

从颗粒两相流超声波动理论出发,提出多信号融合概念,采用单次和多次反射法同时测量颗粒两相流中高频宽带超声波声阻抗、声速和声衰减谱,获取了颗粒两相流系统中密度、浓度、粒径信息.基于该理论研制了可用于同时测量高浓度颗粒两相流密度、浓度、粒径的装置.高浓度水煤浆颗粒两相流测量结果显示,测量密度、浓度与平均粒径与标准对比较为吻合.

A new ultrasonic propagation theory for particulate two-phase flow, the so-called ultrasonic multi-signal combination method, was presented. The acoustic impendence, velocity and attenuation in dense particulate two-phase flow were determined by single and multiple echo reflection signals. Through these enough acoustic informations, the density, concentration and particle size of particulate two-phase flow were obtained. The application based on this theory is also suitable to measure concentration, density and particle size of dense particulate two-phase flow. The experimental results of coal-water slurry show that the measured density, concentration and particle size conincide with the known and standard results.