Measurement of the Thin Liquid Film at the Wet-Gas Outlet of the Supersonic Separator by FPC Conductance Sensor
Measurement of the Thin Liquid Film at the Wet-Gas Outlet of the Supersonic Separator by FPC Conductance Sensor
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FPC电导传感器测量超声速分离器出口液膜厚度
DOI：
10.1109/tim.2023.3273670
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发表时间：
2023
影响因子：
5.6
通讯作者：
Hongbing Ding;Zheng-Yuan Chen;Hongjun Sun;Yan Yang;Zhenxing Liang;Yu Zhang
中科院分区：
文献类型：
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作者：
Hongbing Ding;Zheng-Yuan Chen;Hongjun Sun;Yan Yang;Zhenxing Liang;Yu Zhang
气液两相流广泛存在于天然气输送行业中。液膜的准确测量有助于提高超声速分离器的效率和经济性。为此，设计了一种基于阵列排列的柔性印刷电路（FPC）液膜电导传感器。首先，利用有限元法对传感器的几何参数进行优化。设计了基于现场可编程门阵列（FPGA）的电信号激励与采集系统模块。搭建了液膜标定装置对FPC传感器进行标定，通过标定实验拟合出液膜厚度，拟合曲线误差在± 5. 0%以内。其次，为了分析超声速分离器出口段液膜厚度和速度，在不同工况下进行了多项实验，并对液膜厚度信号进行了时域和频域分析。结果表明，液膜厚度具有双峰特征，其中薄基底层的厚度约为70 μ m，且波动层厚度与工况有关。在不同频段下，归一化能量比和涨落特征有明显的变化。同时，激波的存在严重影响了液膜的形成，导致液膜厚度严重减小。最后，采用互相关算法对液膜速度进行了分析。不同的信号发射和接收电极顺序可以实现不同方向的速度测量。实验结果表明，当背压在0.350 ~ 0.717范围内变化时，分离器出口液膜速度保持在54.8-339.0 mm/s，流向速度的最大均方根误差为4.51 mm/s，周向速度的最大均方根误差为3.38 mm/s。
Gas–liquid two-phase flow widely exists in the natural gas transportation industry. Accurate measurement of the liquid film is conducive to enhance the efficiency and economy of supersonic separators. Therefore, a flexible printed circuit (FPC) liquid film conductance sensor based on array arrangement is designed. First, the geometric parameters of sensors are optimized by the finite element method. The modules of electrical signal excitation and collection system based on field-programmable gate array (FPGA) are designed. A liquid film calibration device is built to calibrate the FPC sensor, the liquid film thickness is fitted through calibration experiments, and the fitting curve error is within ±5.0%. Second, to analyze the liquid film thickness and velocity at the wet-gas outlet Section of the supersonic separator, several experiments are carried out in different working conditions, and the signals of liquid film thickness are processed by time and frequency domain analysis. The results reveal that the liquid film thickness has a bimodal characteristic, where the thickness of the thin base layer is about $70 \mu \text{m}$ , and fluctuating layer thickness is related to working conditions. The normalized energy ratio and fluctuation characteristics significantly changed under different frequency bands. At the same time, the existence of shock waves seriously influences the generation of liquid film, resulting in a decrease in the liquid film thickness seriously. Last, the cross correlation algorithm is used to analyze the liquid film velocity. The different signal transmitter and receiver electrode orders can realize the velocity measurement in different directions. The experimental results show that the liquid film velocity at the outlet of the supersonic separator maintains at 54.8–339.0 mm/s when the back pressure ranges from 0.350 to 0.717, the maximum root mean square error (RMSE) of flow direction velocity is 4.51 mm/s, and the maximum RMSE of circumferential direction velocity is 3.38 mm/s.