一种测量液膜厚度的超声相控阵实验装置

Ultrasonic phased array experimental device for liquid film thickness measurement

气液两相流存在于核反应堆蒸发、飞行器冷却、化工生产降膜蒸发等过程,界面波的动态测量对工业过程监控和生产优化具有重要意义。界面波的准确识别与特性参数测量是开展科学研究与工程实践的重要前提。基于超声相控阵测量系统,设计了扇扫的测量方式,可以用于气液界面清晰的流型中液膜厚度和界面波形态三维测量。通过静态标定和圆管验证,确定了像素点和液膜厚度之间的关系,在气相表观流速为0.0719~0.4316 m/s,液相表观流速为0.0567~1.4161 m/s的工况下进行实时动态实验,获得了实时流动过程中较高精度的截面气液相界面信息,并构建了管道内部界面波三维分布形态,为界面波特性研究提供了一种实验参考方法。

Gas-liquid two-phase flow exists in processes such as nuclear reactor evaporation,aircraft cooling,and chemical production falling-film evaporation.Dynamic measurement of interfacial waves is of great significance for industrial process monitoring and production optimization.The accurate identification and characteristic parameter measurement of interfacial waves are important prerequisite for scientific research and engineering practice.Based on the ultrasonic phased array measurement system,the measurement method of sector scan is designed,which can be used for liquid film thickness and three-dimensional measurement of interfacial wave morphology with clear gas-liquid interfacial.Through static calibration and circular tube verification,the relationship between pixel points and liquid film thickness is determined.The real-time dynamic experiments are carried out under the gas superficial velocity is 0.0719~0.4316 m/s and the liquid superficial velocity is 0.0567~1.4161 m/s.The cross-sectional gas-liquid interfacial information with high accuracy in real-time flow process is obtained,and the three-dimensional distribution of interfacial waves is built,which provides an experimental reference method for the study of interfacial wave characteristics parameters.