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Buoyant Tsuji diffusion flames: global flame structure and flow field

Published online by Cambridge University Press:  18 May 2020

Mariovane S. Donini Open the ORCID record for Mariovane S. Donini [Opens in a new window] ,
Cesar F. Cristaldo Open the ORCID record for Cesar F. Cristaldo [Opens in a new window]  and
Fernando F. Fachini Open the ORCID record for Fernando F. Fachini [Opens in a new window]
Mariovane S. Donini
Affiliation:
Grupo de Mecânica de Fluidos Reativos, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista SP, Brazil
Cesar F. Cristaldo
Affiliation:
Laboratório de Fluidodinâmica Computacional e Turbulência Atmosférica,Universidade Federal do Pampa, Alegrete RS, Brazil
Fernando F. Fachini*
Affiliation:
Grupo de Mecânica de Fluidos Reativos, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista SP, Brazil
*
†Email address for correspondence: fernando.fachini@inpe.br
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Abstract

The present work analyses how buoyancy is impacting the topology of diffusion flames established around a horizontal cylindrical burner. The flow conditions are chosen such that the system is subjected to negative and positive buoyant forces. It is proposed in this study to investigate the effect of a modulation of the balance between these buoyant forces on the flame structure by varying the temperature of the ambient atmosphere. More specifically, conditions are sought for establishing a buoyant Tsuji diffusion flame characterized by a very low level of strain rate in its lower part (i.e. below the burner). To understand the fundamental mechanisms controlling the whole flame topology, a model is proposed which assumes steadiness and incompressibility of the flow while retaining buoyancy effects in the momentum balance. The results showed that an increase of the ambient temperature leads to the appearance of a counterflow zone below the burner where the flame is undergoing very low levels of strain rate. The overall flame proves to be shorter than its counterpart observed in the forced convection regime. In addition, it is shown that an order of magnitude analysis is able to recover the sensitivity of the flame behaviour to the Péclet and Froude numbers as well as to the combustion parameters. In a certain range of the ambient-atmosphere temperature, the flow field changes dramatically: for the same boundary conditions, there are two steady-state solutions which depend on the initial conditions, i.e. the system presents a hysteresis.

JFM classification

Reacting Flows: Laminar reacting flows Convection: Buoyancy-driven instability Vortex Flows: Vortex dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 895 , 25 July 2020 , A17
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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