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Analysis of the nonlinear dynamic mechanisms of combustion modes in a rotating detonation combustor

Published online by Cambridge University Press:  08 August 2025

Faxuan Luo ,
Haocheng Wen  and
Bing Wang Open the ORCID record for Bing Wang [Opens in a new window]
Faxuan Luo
Affiliation:
School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China
Haocheng Wen*
Affiliation:
School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China
Bing Wang*
Affiliation:
School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China
*
Corresponding authors: Haocheng Wen, haochengwenson@126.com; Bing Wang, wbing@tsinghua.edu.cn
Corresponding authors: Haocheng Wen, haochengwenson@126.com; Bing Wang, wbing@tsinghua.edu.cn
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Abstract

A rotating detonation combustor exhibits corotating $N$-wave modes with $N$ detonation waves propagating in the same direction. These modes and their responses to ignition conditions and disturbances were studied using a surrogate model. Through numerical continuation, a mode curve (MC) is obtained, depicting the relationship between the wave speed of the one-wave mode and a defined baseline of the combustor circumference ($L_{{base}}$) under fixed equation parameters, limited by deflagration and flow choking. The modes’ existence is confirmed by the equivalence between a one-wave mode within a combustor with circumference $L_{{base}}$/$N$ on the MC and an $N$-wave mode in an $L_{{base}}$ combustor. The stability, measured by the real part of the eigenvalue from linear stability analysis (LSA), revealed the dynamic properties. When multiple stable modes exist under the same parameters, ignition conditions with a spatial period of $L_{{base}}$/$N$ are more likely to form $N$-wave modes. An unstable evolution in formed modes, occurs in the dynamics from stable to unstable modes through saddle-node bifurcation and Hopf bifurcation induced by parameter perturbations and from unstable to stable modes induced by state disturbances. Eigenmodes from LSA reveal mechanisms of the unstable evolution, including the effect of secondary deflagration in the unstable one-wave mode and competitive interaction between detonation waves in the unstable multiwave mode, crucial for the combustor to mode transition.

JFM classification

Reacting Flows: Combustion Compressible Flows: Detonation waves Nonlinear Dynamical Systems: Bifurcation

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Type
JFM Papers
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Journal of Fluid Mechanics , Volume 1016 , 10 August 2025 , A68
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© The Author(s), 2025. Published by Cambridge University Press

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