Abstract
Many complex systems undergo critical transitions. A thermoacoustic system is one such system which exhibits a catastrophic transition to a state of oscillatory instability known as thermoacoustic instability. So far, several early warning signals have been devised to detect the transition from stable operation to thermoacoustic instability in both laminar and turbulent systems. We focus on these early warning signals, and the challenges faced while detecting oscillatory instabilities in practical systems. In contrast to the transition from a fixed point to limit cycle oscillations in laminar systems, turbulent systems exhibit a transition from a chaotic state to limit cycle via a state of intermittency. In this review, we highlight the importance of the inherent fluctuations in the system in providing early warning signals for critical transitions.
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Acknowledgements
We thank A. Roy, S. Tandon, P. Kasthuri, and A. Sahay for their comments/suggestions for the manuscript. We acknowledge the help from Mr. P R., Midhun and S. Anand in conducting the experiments for the data used in Sect. 4.1.2. R.I.S. thanks the SERB, Department of Science and Technology for founding this work through the Swarnajayanti, and JC Bose fellowships and the Office of Naval Research Global (ONRG). I. P. is grateful to the Ministry of Human Resource Development, India and the Indian Institute of Technology Madras for providing research assistantship. We thank Dr. Ramesh Kolar (ONRG) for his strong support.
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Pavithran, I., Unni, V.R. & Sujith, R.I. Critical transitions and their early warning signals in thermoacoustic systems. Eur. Phys. J. Spec. Top. 230, 3411–3432 (2021). https://doi.org/10.1140/epjs/s11734-021-00214-w
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DOI: https://doi.org/10.1140/epjs/s11734-021-00214-w