Application of multi-scale entropy in analyzing pressure difference signals of gas-liquid two-phase flow in rod bundled channel

ZHOU Yunlong; YIN Hongmei; DING Huixiao

doi:10.11949/j.issn.0438-1157.20160334

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Application of multi-scale entropy in analyzing pressure difference signals of gas-liquid two-phase flow in rod bundled channel

更新时间：2025-12-10

- Application of multi-scale entropy in analyzing pressure difference signals of gas-liquid two-phase flow in rod bundled channel
- CIESC Journal Issue 9, Pages: 3625-3632(2016)
- 作者机构：
  
  东北电力大学能源与动力工程学院,吉林市,吉林省,132012
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160334
  CLC： L334
- Online First：05 September 2016，
  
  Published：05 September 2016
- 稿件说明：
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ZHOU Yunlong, YIN Hongmei, DING Huixiao. Application of multi-scale entropy in analyzing pressure difference signals of gas-liquid two-phase flow in rod bundled channel[J]. CIESC Journal, 2016, (9): 3625-3632.
DOI：

ZHOU Yunlong, YIN Hongmei, DING Huixiao. Application of multi-scale entropy in analyzing pressure difference signals of gas-liquid two-phase flow in rod bundled channel[J]. CIESC Journal, 2016, (9): 3625-3632. DOI： 10.11949/j.issn.0438-1157.20160334.

摘要

棒束通道气液两相流的压差信号是非线性的，多尺度熵法在分析非线性信号方面效果较好。运用多尺度熵对压差信号进行分析，在7×7棒束通道的气液两相流实验台上采集压差信号，针对104种流动条件4种流型的压差时间序列分析其多尺度熵特征。研究发现：小尺度（前8个）下的多尺度熵率可以准确区分棒束通道4种流型；大尺度下的样本熵变化趋势可以揭示4种流型的动力学特性。

Abstract

Due to non-linearity of pressure difference signals of gas-liquid two-phase flow in rod bundled channel and capability of multi-scale entropy analysis in charactering complex signals

multi-scale entropy analysis was used to study time series of pressure difference signals of gas-liquid two-phase flow in the 7×7 rod bundled channel under 104 different flow conditions. Results showed that the change rate of multi-scale entropy in small scales (no more than 8) could accurately distinguish four flow regimes in the rod bundled channel whereas the trending of large scale sample entropy could disclose dynamic characteristics of each flow regime. Therefore

compared to chaotic time series analysis of R/S method

the multi-scale entropy analysis method could reveal the dynamic characteristics and also accurately distinguish four flow regimes of gas-liquid two-phase flow in the rod bundled channel.

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