Characterization and detection of thermoacoustic combustion oscillations based on statistical complexity and complex-network theory

Shogo Murayama, Hikaru Kinugawa, Isao T. Tokuda, and Hiroshi Gotoda
Phys. Rev. E 97, 022223 – Published 27 February 2018

Abstract

We present an experimental study on the characterization of dynamic behavior of flow velocity field during thermoacoustic combustion oscillations in a turbulent confined combustor from the viewpoints of statistical complexity and complex-network theory, involving detection of a precursor of thermoacoustic combustion oscillations. The multiscale complexity-entropy causality plane clearly shows the possible presence of two dynamics, noisy periodic oscillations and noisy chaos, in the shear layer regions (1) between the outer recirculation region in the dump plate and a recirculation flow in the wake of the centerbody and (2) between the outer recirculation region in the dump plate and a vortex breakdown bubble away from the centerbody. The vertex strength in the turbulence network and the community structure of the vorticity field can identify the vortical interactions during thermoacoustic combustion oscillations. Sequential horizontal visibility graph motifs are useful for capturing a precursor of themoacoustic combustion oscillations.

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  • Received 29 October 2017

DOI:https://doi.org/10.1103/PhysRevE.97.022223

©2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Nonlinear Dynamics

Authors & Affiliations

Shogo Murayama1, Hikaru Kinugawa2, Isao T. Tokuda2, and Hiroshi Gotoda1,*

  • 1Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo 125-8585, Japan
  • 2Department of Mechanical Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan

  • *Corresponding author: gotoda@rs.tus.ac.jp

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Issue

Vol. 97, Iss. 2 — February 2018

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