Abstract
The occurrence of thermoacoustic instability has been a major concern in the combustors used in power plants and propulsive systems such as gas turbine engines, rocket motors. A positive feedback between the inherent processes such as the acoustic field and the unsteady heat release rate of the combustor can result in the occurrence of large-amplitude, self-sustained pressure oscillations. Prior to the state of thermoacoustic instability, intermittent oscillations are observed in turbulent combustors. Such intermittent oscillations are characterized by an apparently random appearance of bursts of large-amplitude periodic oscillations interspersed between epochs of low-amplitude aperiodic oscillations. In most of the earlier studies, the pressure oscillations alone have been analyzed to explore the dynamical transition to thermoacoustic instability. The present chapter focuses on the instantaneous interaction between the acoustic field and the unsteady heat release rate observed during such a transition in a bluff-body-stabilized turbulent combustor. The instantaneous interaction of these oscillations will be discussed using the concepts of synchronization theory. First, we give a brief introduction to the synchronization theory so as to summarize the concepts of locking of phase and frequency of the oscillations. Then, the temporal and spatiotemporal aspects of the interaction will be presented in detail. We find that, during stable operation, aperiodic oscillations of the pressure and the heat release rate remain desynchronized, whereas synchronized periodic oscillations are noticed during the occurrence of thermoacoustic instability. Such a transition happens through intermittent phase-synchronized oscillations, wherein synchronization and desynchronization of the oscillators are observed during the periodic and the aperiodic epochs of the intermittent oscillations, respectively. Further, the spatiotemporal analysis reveals a very interesting pattern in the reaction zone. Phase asynchrony among the local heat release rate oscillators is observed during the stable operation, while they become phase-synchronized during the onset of thermoacoustic instability. Interestingly, the state of intermittent oscillations corresponds to a simultaneous existence of synchronized periodic and desynchronized aperiodic patterns in the reaction zone. Such a coexistence of synchrony and asynchrony in the reactive flow field mimics a chimera state.
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- \(R_a\) :
-
Rayleigh integral
- \(\varDelta f\) :
-
Frequency detuning
- \(\omega _0\) :
-
Natural angular frequency
- E :
-
Embedding dimension
- T :
-
Optimum time delay
- V :
-
Volume of the combustion zone
- \(\varTheta \) :
-
Heaviside step function
- \(\mathbb {R}_{i,j}\) :
-
Recurrence Matrix
- \(\varepsilon \) :
-
Cutoff threshold
- \(P(\tau )\) :
-
Probability of recurrence
- \(\tau \) :
-
Time lag
- \(\bar{u}\) :
-
Mean flow velocity
- \(p^\prime \) :
-
Pressure oscillations
- \(\dot{q}^\prime \) :
-
Heat release rate oscillations
- R(t):
-
Kuramoto order parameter
- \(\bar{R}\) :
-
Time-averaged Kuramoto order parameter
- \(\zeta (t)\) :
-
Analytic signal
- RP:
-
Recurrence Plot
- PMT:
-
Photomultiplier tube
- PSD:
-
Power spectral density
- PS:
-
Phase synchronization
- GS:
-
Generalized synchronization
- IPS:
-
Intermittent phase synchronization
- FWHM:
-
Full width at half maximum
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Acknowledgements
The authors would like to thank Office of Naval Research Global (ONRG) for the funding (grant no. N62909-14-1-N 299); Dr. R. Kolar is the contract monitor from ONRG. SM gratefully acknowledges the institute postdoctoral fellowship from IIT Madras. The authors gratefully acknowledge the valuable discussions with Mr. A. Seshadri, Dr. V. R. Unni, Dr. D. V. Senthilkumar, Dr. V. K. Chandrasekar, and Prof. M. Lakshmanan. The authors would also like to acknowledge the help provided by Mr. N. Babu, Mr. Thilagraj, Mr. Manikandan, and Mr. Syam for conducting the experiments. We are grateful to Mr. Thilagraj for providing the schematic of the experimental setup and to Dr. T. Komarek and Prof. W. Polifke for providing the design, which was adapted to fabricate this setup.
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Mondal, S., Pawar, S.A., Sujith, R.I. (2018). Synchronization Transition in a Thermoacoustic System: Temporal and Spatiotemporal Analyses. In: Runchal, A., Gupta, A., Kushari, A., De, A., Aggarwal, S. (eds) Energy for Propulsion . Green Energy and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-10-7473-8_6
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