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An exceptional point switches stability of a thermoacoustic experiment

Published online by Cambridge University Press:  11 June 2021

Abdulla Ghani Open the ORCID record for Abdulla Ghani [Opens in a new window]  and
Wolfgang Polifke Open the ORCID record for Wolfgang Polifke [Opens in a new window]
Abdulla Ghani*
Affiliation:
Department of Mechanical Engineering and Transport Systems, Technical University of Berlin, 10623 Berlin, Germany
Wolfgang Polifke
Affiliation:
Department of Mechanical Engineering, Technical University of Munich, D-85748 Garching, Germany
*
†Email address for correspondence: ghani@tu-berlin.de
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Abstract

We identify an exceptional point in the numerical stability map of a combustion experiment operated with laminar premixed flames. A low-order model of the experiment allows one to investigate the interplay between the system modes and an exceptional point. The latter is located in the unstable region of the complex eigenvalue plane. Under gradual variation of the operating parameters, the branch-switching characteristic of the exceptional point can facilitate abrupt changes between strong instability and stable operation. The results also indicate that intrinsic thermoacoustic feedback plays an important role in the stability characteristics of this experiment.

JFM classification

Nonlinear Dynamical Systems: Low-dimensional models

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JFM Rapids
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Journal of Fluid Mechanics , Volume 920 , 10 August 2021 , R3
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© The Author(s), 2021. Published by Cambridge University Press

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References

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