撞击流反应器压力波动的多尺度多分形特征分析

ZHANG Jianwei; JIAO Li

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撞击流反应器压力波动的多尺度多分形特征分析

更新时间：2025-12-10

- 撞击流反应器压力波动的多尺度多分形特征分析
- CIESC Journal Issue 7, (2006)
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- Online First：25 July 2006，
  
  Published：25 July 2006
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ZHANG Jianwei, JIAO Li. 撞击流反应器压力波动的多尺度多分形特征分析[J]. CIESC Journal, 2006, (7).
DOI：

ZHANG Jianwei, JIAO Li. 撞击流反应器压力波动的多尺度多分形特征分析[J]. CIESC Journal, 2006, (7). DOI：

摘要

对浸没循环撞击流反应器不同转速下的压力波动信号用 Daubechies 二阶小波在 1～9 尺度下进行分解，并分别对分解的信号进行R/S分析.研究发现，分解的信号可由多尺度方法得到较好的理解.对压力波动信号不同尺度下的细节信号与概貌信号分析表明，在不同的尺度下表现出不同的分形结构，且随着转速的增大，分形结构的变化趋势基本一致.此外，该系统不仅存在确定性非周期成分，而且粒子团之间有相似的能量交换，产生了湍流的扩散，符合耗散系统的特征.在粒子相互撞击的过程中，产生了不同尺度的旋涡，从而导致混沌的产生.

Abstract

The complexity of pressure fluctuation dynamics in submerged circulative impinging stream reactor (SCISR) with different rotating speeds was studied by using the multi-scale and R/S analysis method.The Daubechies second order wavelet was firstly used to decompose pressure signals at different rotative speeds to 1—9 scale detail signals and scale approximation signals.Then

Hurst analysis was used to analyze multi-fractal characteristics of different scale signals.By analyzing the signal profile of different scales

different fractal structures at different scales were found

and there remained the similar trend with increasing rotating speed.Besides

there were some deterministic non-periodic components in the system and similar energy exchange between particles caused the diffusion of turbulence

which was the characteristic of an open system.The vortex with different scales would cause chaos.

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