Multi-scale and nonlinear analysis of two phase flow pattern in measurement channel of concentrating type conductance sensor

In order to investigate the flow patterns of gas/liquid two phase flow existing widely in Daqing oilfield of China, conductance signals of 104 gas/liquid two phase flow conditions has been acquired in concentrating channel on the three phase flow experimental facility of Tianjin University. Firstly, the fluctuating conductance signals are decomposed into seven scale signals and then recurrence plot is employed to analysis the original signal and each scale signal. The results indicate the recurrence plot has perfect identification ability in analyzing the flow patterns of complex gas/liquid flow. Simultaneously, two dimensional attractor morphologic characteristics of each order have been extracted, the effective feature combination used to identify the flow pattern is found through the analysis of attractor morphologic characteristics. The result shows that attractor morphologic characteristics can well reflect the flow pattern transition and it is an effective analysis method of flow pattern identification.