Global analysis of stability of isothermal swirling flow in a model combustion chamber
I. Lutchenko1,2, A.V. Proskurin2,3, E.V. Palkin1, R.I. Mullyadzhanov1,2, S.V. Alekseenko1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia
Keywords: swirling flow, precessing vortex core, linear stability analysis
Abstract
This paper presents the analysis of linear stability of a swirling flow in a model combustion chamber. The flow is characterized by a strongly coherent component corresponding to vortex core precession. Using averaged data obtained via the large eddy simulation, a global stability analysis was performed taking into account turbulent viscosity. A mode with a dimensionless frequency of 0.76 was identified in the eigenvalue spectrum. The eigenfunction distributions indicate that this mode corresponds to a precessing vortex core (PVC). The study confirms that the PVC is a global unstable mode developing in a mean turbulent flow and will serve as a basis for further work on the development of PVC control strategies.
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