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Suppression of thermoacoustic instability by targeting the hubs of the turbulent networks in a bluff body stabilized combustor

Published online by Cambridge University Press:  13 April 2021

Abin Krishnan Open the ORCID record for Abin Krishnan [Opens in a new window] ,
R.I. Sujith Open the ORCID record for R.I. Sujith [Opens in a new window] ,
Norbert Marwan  and
Jürgen Kurths
Abin Krishnan*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
R.I. Sujith
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
Norbert Marwan
Affiliation:
Potsdam Institute for Climate Impact Research, Potsdam 14412, Germany
Jürgen Kurths
Affiliation:
Potsdam Institute for Climate Impact Research, Potsdam 14412, Germany Department of Physics, Humboldt University Berlin, Newtonstr. 15, 12489 Berlin, Germany Institute for Complex Systems and Mathematical Biology, University of Aberdeen, Aberdeen AB 24 UE, United Kingdom
*
†Email address for correspondence: abin.roja@gmail.com
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Abstract

In the present study, we quantify the vorticity interactions in a bluff body stabilized turbulent combustor during the transition from combustion noise to thermoacoustic instability via intermittency using complex networks. To that end, we perform simultaneous acoustic pressure, high-speed particle image velocimetry (PIV) and high-speed chemiluminescence measurements during the occurrence of combustion noise, intermittency and thermoacoustic instability. Based on the Biot–Savart law, we construct time-varying weighted spatial networks from the flow fields during these different regimes of combustor operation. We uncover that the turbulent networks display weighted scale-free behaviour intermittently during the different regimes of combustor operation, with the strong vortical structures acting as the hubs. Further, we discover two optimal locations for injecting steady air jets to successfully suppress the thermoacoustic oscillations. The amplitude of the acoustic pressure fluctuations of the suppressed state is comparable to that during the occurrence of combustion noise. However, the weighted scale-free network topology during the suppressed state is not as dominant as compared with the state of combustion noise.

JFM classification

Reacting Flows: Turbulent reacting flows Flow Control: Instability control

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JFM Papers
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Journal of Fluid Mechanics , Volume 916 , 10 June 2021 , A20
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© The Author(s), 2021. Published by Cambridge University Press

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References

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