Time-frequency analysis on differential pressure signal of two-phase flow based on EEMD

In order to study the dynamic characteristics of gas-liquid two-phase flow,a time-frequency analysis method of gas-liquid two-phase flow is proposed based on ensemble empirical mode decomposition (EEMD),using V cone flowmeter as a measuring device and the high fre-quency differential pressure transmitter to obtain the dynamic signal under different flow pat-terns.In order to lay the theoretical foundation for the further research on gas-liquid two-phase flow mechanism and accurate measurement of the flow,the differential pressure signals of the gas-liquid two-phase flow for different flow regimes are analyzed thoroughly.The analysis shows that EEMD exhibits a satisfying mixing decomposition ability,as it can extract frequency compo-nents of differential pressure signal of two-phase flow and the real-time situation accurately.It provides the theoretical basis for the identification of two-phase flow in future and has a high val-ue to engineering application.