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Detection and identification of nature of mutual synchronization for low- and high-frequency non-premixed syngas combustion dynamics

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Abstract

Non-premixed syngas combustion anchored by a bluff body is investigated for its multimodal operation of low- and high-frequency instability corresponding to different Reynolds numbers. Simultaneous high-speed imaging of OH* and CO2* chemiluminescence is exploited with syngas to examine synchronous or sequential twin heat release rate zones from H2 oxidation to OH and CO oxidation by OH, based on past studies from this group. Flame dynamics of both low- and high-frequency oscillations reveals that the former is significantly dictated by flame residing in the shear layer and in the wall vicinity, whereas with the latter, it has both lateral and the aforementioned stabilization contributing in equal measure. By performing a causality-based synchronization measure, we determine regions of synchronization and the degree of causality between the two heat release rate zones. It is seen that the high-amplitude low-frequency oscillations have lesser but near instantaneously interacting synchronous regions. High-frequency oscillations display multi-valued causal indices that illustrate the existence of lag synchronization. Further, low-frequency oscillations display dispersion in peaks of chemiluminescence, resulting in loss of synchronization in downstream regions.

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Abbreviations

GS:

General synchronization

LS:

Lag synchronization

Pe:

Peclet number

PL:

Phase-locked

PS:

Phase synchronization

Re:

Inlet air Reynolds number, based on bluff-body diameter and average velocity

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Acknowledgements

We thank Mr. N. Baladandayuthapani and Mr. Chetankkumar S. Vegad for their help during the work. The National Centre for Combustion R & D was supported by the Science and Engineering Research Board. This work was also partially supported by the UK-India Education and Research Initiative.

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No funding was received to assist with the preparation of this manuscript.

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Authors and Affiliations

  1. National Centre for Combustion Research and Development & Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    Vikram Ramanan & S. R. Chakravarthy

  2. Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology Surat, Surat, 395007, India

    Nikhil A. Baraiya

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  1. Vikram Ramanan
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Correspondence to Nikhil A. Baraiya.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Ramanan, V., Baraiya, N.A. & Chakravarthy, S.R. Detection and identification of nature of mutual synchronization for low- and high-frequency non-premixed syngas combustion dynamics. Nonlinear Dyn 108, 1357–1370 (2022). https://doi.org/10.1007/s11071-022-07264-2

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