环状流波状液膜时平均厚度动态校准方法

为实现环状气液两相流界面波液膜厚度的准确测量,基于环状流界面波的理论分析和实验研究,将实时海浪模拟思想引入界面扰动波研究,建立了基于三级海浪函数的界面扰动波模型。设计了一种基于直接测量法的可调节插入深度的波状液膜厚度测量传感器。提出了基于占空比算法的时平均液膜厚度动态校准方法。对测量传感器进行测量不确定度来源分析及评定,提出了系统误差补偿算法。在双闭环可调压中压湿气实验装置上对上述测量传感器进行了实验验证,结果表明:以三级海浪为模型进行研究在任意统计时间与任意插入深度增量条件下,94.44%的实验点的相对测量不确定度在2%以内;基于直接测量法实现液膜厚度复现并使用系统误差补偿算法,提高了测量精度。

Dynamic calibration method for mean thickness of annular flow wavy liquid film

The real-time ocean wave simulation idea is introduced into the study of interface disturbance wave in annular flow to realize the accurate measurement of the liquid film thickness. A model of interface disturbance wave based on three-level ocean wave function is established based on the theoretical analysis and experimental research of the annular flow interface wave. A wavy liquid film thickness measurement sensor with adjustable insertion depth is designed based on direct measurement method. A dynamic calibration method of time-average liquid film thickness based on duty cycle algorithm is proposed. The source of measurement uncertainty of the sensor is analyzed and evaluated, and the system error compensation algorithm is proposed. The sensor is tested and verified on a double closedloop adjustable pressure medium pressure humidity experimental device. Results show that: under the conditions of arbitrary statistical time and arbitrary insertion depth increment, the relative measurement uncertainty of 94. 44% of the experimental points is within 2% when using the three-level ocean wave model. The liquid film thickness is reproduced using the direct measurement method and the measurement accuracy is improved using the system error compensation algorithm.