Multiscale entropy analysis of two-phase flow in inclined pipe under vibration condition

doi:10.11949/j.issn.0438-1157.20171087

Abstract

Abstract:

After combined vibration apparatus with experiment loop of two-phase flow, gas-liquid two-phase flow in inclined pipe was studied experimentally under fluctuant vibration. The flow patterns were recorded and pressure fluctuation signal was analyzed by multiscale entropy method. The results indicate that two new flow patterns of bead flow and fluctuant slug flow are created in inclined pipe under vibration condition. Multiscale entropy analyses were performed on pressure fluctuation signals of five typical flow patterns under 95 different flow conditions. Results show that entropy change rate of different flow patterns at low scale (first nine) is obviously different and entropy at high scale can reflect dynamic characteristics of different flow patterns.

Key words: fluctuant vibration, multiscale, entropy, inclined pipe, gas-liquid two-phase flow

摘要：

将振动装置和气液两相流实验回路相结合，在起伏振动状态下对倾斜管内气液两相流进行实验研究，观察记录流型并使用多尺度熵方法对压差波动信号进行分析。研究结果表明振动条件下倾斜管内出现两种新流型为珠状流、起伏弹状流。同时对95种流动条件下的5种典型流型的差压波动信号进行多尺度熵分析。结果表明，不同流型在低尺度（前9个）下的熵值变化率有明显不同，高尺度下的熵值可以反映不同流型的动力学特性。

关键词: 起伏振动, 多尺度, 熵, 倾斜管, 气液两相流

CLC Number:

O359

ZHOU Yunlong, LI Shanshan. Multiscale entropy analysis of two-phase flow in inclined pipe under vibration condition[J]. CIESC Journal, 2018, 69(5): 1884-1891.

周云龙, 李珊珊. 起伏振动状态下倾斜管内两相流多尺度熵分析[J]. 化工学报, 2018, 69(5): 1884-1891.

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