Analysis of liquid film measurement in the wet gas outlet section of supersonic swirling separator
As a new type of multiphase flow separation technology,supersonic swirling separation technology has a good application prospect in the field of natural gas dehydration and hydrocarbon removal.Liquid film characteristics in supersonic separators have a significant impact on separation performance.Therefore,the liquid film characteristics of its wet gas outlet was taken as research object,and a set of FPC conductive liquid film thickness measurement system was developed,and a calibration device was designed to obtain the actual output characteristics of the sensor.On the basis,an experimental tube section was constructed and gas-liquid two-phase separation experiments were carried out to investigate the effects of inlet liquid content and back pressure ratio on the liquid film thickness at the wet gas outlet of the supersonic separator.The calibration results showed that the sensor had high sensitivity at the liquid film thickness below 500μm,and the fitting error was within±5%.A bimodal distribution of the liquid film thickness with a base layer thickness of about 70μm was analyzed statistically in the time domain.There was a significant difference in the trend of energy distribution between the 2nd and 3rd frequency bands after wavelet packet decomposition and the other frequency bands in the frequency domain,whereby the original signal was sequentially reconstructed,subjected to local mean decomposition,solved for approximate entropy and clustered.The liquid film fluctuation increased with increasing liquid content,and the approximate entropy can be clustered into three classes corresponding to three flow patterns.Last,the liquid film disturbance wave velocity was analyzed by using the cross-correlation algorithm,and both the flow direction component and the circumferential direction component showed an exponential growth trend with the increase of liquid content,and the flow direction component and its RMSE ranged from 84.7mm/s to 339.0mm/s and 1.15mm/s to 4.51mm/s,respectively,and the circumferential direction component and its RMSE ranged from 54.8mm/s to 186.4mm/s and 1.20mm/s to 3.38mm/s.
supersonic swirling separatorFPC conductive liquid film sensorliquid film featurecontinuous wavelet transform(CWT)local mean decomposition(LMD)
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