基于EEMD气液两相流差压信号时频分析

为研究气液两相流流动过程的动态特性,采用V形内锥作为测量装置,通过高频差压变送器获得不同流型下的动态信号,提出了一种基于总体平均经验模式分解（EEMD）的气液两相流时频分析方法。通过对不同流型下的气液两相流的差压信号进行分析,研究了气液两相流的流动机理,为气液两相流流型及流量的准确测量奠定理论基础。分析发现EEMD的抗混分解能力很好,可以准确地提取两相流差压信号的频率成分及其时变情况,为今后两相流的识别提供理论基础,具有较高的工程应用价值。

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 timefrequency 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 frequency differential pressure transmitter to obtain the dynamic signal under different flow patterns.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 components 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 value to engineering application.