Dynamic behavior and driving region of spray combustion instability in a backward-facing step combustor

We numerically study the dynamic behavior and driving region of spray combustion instability in a backward-facing step combustor using analytical methodologies based on dynamical systems theory, symbolic dynamics, complex networks, and machine learning. The global dynamic behavior of a heat release...

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Bibliographic Details
Published in:Physical review. E 2024-08, Vol.110 (2-1), p.024204, Article 024204
Main Authors: Kato, Kenta, Hashiba, Hiroyuki, Nagao, Jun, Gotoda, Hiroshi, Nabae, Yusuke, Kurose, Ryoichi
Format: Article
Language:English
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Summary:We numerically study the dynamic behavior and driving region of spray combustion instability in a backward-facing step combustor using analytical methodologies based on dynamical systems theory, symbolic dynamics, complex networks, and machine learning. The global dynamic behavior of a heat release rate field represents low-dimensional chaotic oscillations with deterministically aperiodic intercycle dynamics. Spray combustion instability is driven in the formation and separation region of a large-scale organized vortex induced by the hydrodynamic shear layer instability at the edge of the backstep. This region corresponds fairly to that of the hub in an acoustic-energy-flux-based spatial network. The feature importance in a random forest is valid for clarifying the feedback coupling of spray combustion instability.
ISSN:2470-0045
2470-0053
2470-0053
DOI:10.1103/PhysRevE.110.024204