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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the emergence of critical regions at the onset of thermoacoustic instability in a turbulent combustor

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Author(s):
Unni, Vishnu R. [1] ; Krishnan, Abin [1] ; Manikandan, R. [1] ; George, Nitin B. [1] ; Sujith, R. I. [1] ; Marwan, Norbert [2] ; Kurths, Juergen [2, 3, 4]
Total Authors: 7
Affiliation:
[1] Indian Inst Technol Madras, Madras 600036, Tamil Nadu - India
[2] Potsdam Inst Climate Impact Res, D-14412 Potsdam - Germany
[3] Humboldt Univ, Dept Phys, Newtonstr 15, D-12489 Berlin - Germany
[4] Univ Aberdeen, Inst Complex Syst & Math Biol, Aberdeen AB2 4UE - Scotland
Total Affiliations: 4
Document type: Journal article
Source: Chaos; v. 28, n. 6 JUN 2018.
Web of Science Citations: 5
Abstract

We use complex network theory to investigate the dynamical transition from stable operation to thermoacoustic instability via intermittency in a turbulent combustor with a bluff body stabilized flame. A spatial network is constructed, representing each of these three dynamical regimes of combustor operation, based on the correlation between time series of local velocity obtained from particle image velocimetry. Network centrality measures enable us to identify critical regions of the flow field during combustion noise, intermittency, and thermoacoustic instability. We find that during combustion noise, the bluff body wake turns out to be the critical region that determines the dynamics of the combustor. As the turbulent combustor transitions to thermoacoustic instability, during intermittency, the wake of the bluff body loses its significance in determining the flow dynamics and the region on top of the bluff body emerges as the most critical region in determining the flow dynamics during thermoacoustic instability. The knowledge about this critical region of the reactive flow field can help us devise optimal control strategies to evade thermoacoustic instability. Published by AIP Publishing. (AU)

FAPESP's process: 11/50151-0 - Dynamical phenomena in complex networks: fundamentals and applications
Grantee:Elbert Einstein Nehrer Macau
Support Opportunities: Research Projects - Thematic Grants