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Oil-water Two Phase Flow Pattern Recognition Based on Electric Conductance Fluctuation Signal

Author: ZhangSongLin
Tutor: ZhouYunLong
School: Tohoku Electric Power University
Course: Detection Technology and Automation
Keywords: Oil-water two-phase flow Flow pattern identification Wavelet packet decomposition Empirical Mode Decomposition Neural Networks
CLC: O359
Type: Master's thesis
Year: 2011
Downloads: 39
Quote: 0
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Abstract


Oil-water two-phase flow is widespread among modern industrial production , have a great impact on the flow -type flow and heat transfer characteristics of , and how to determine the flow pattern of the two-phase flow has been an important topic in the study of two-phase flow . There are two traditional oil-water flow patterns identification method : one is the use of human observation or measurement methods ; Another method is the use of flow pattern transition criteria or flow pattern map . Traditional flow identification method is not only influenced by subjective factors , and the flow - line identification can not be achieved , so the need to improve the traditional identification methods . The experimental study of the experimental stage in the oil-water two-phase flow , and the vertical riser conductance fluctuations of oil-water two-phase flow signal analysis . And the wavelet transform , wavelet packet decomposition , the EMD decomposition and neural network is applied to the flow pattern identification from both experimental and theoretical aspects of the flow - intelligent recognition method . First conductance fluctuating signal denoising using wavelet transform , and then the application of wavelet packet decomposition , EMD decomposition convection conductance fluctuating signal analysis , extraction of wavelet packet energy and the IMF energy as the characteristics of the flow pattern , then using BP , the RBF improved RBF and Elman NN model as the type of oil - water two-phase flow pattern classifier . Finally, the different feature vectors extracted training samples were sent to BP, RBF, improved RBF and Elman neural network training , the trained classifier model as the flow pattern identification . The results show that the identification of the test samples found that IMF - based energy and improved RBF neural network to identify the best . Theoretically and technically intelligent recognition of Multiphase Flow has opened up a new way .

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Multiphase flow
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