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Large-eddy simulation of interactions between a reacting plume and water spray

Large-eddy simulation of interactions between a reacting plume and water spray
Large-eddy simulation of interactions between a reacting plume and water spray
Study on water-based residential fire suppression system has received renewed attention due to environmental benefit. The progress on gaining detailed knowledge of this complex system, however, has been relatively slow. The objective of this paper is to pursue a better understanding of the interaction mechanisms between an upward reacting plume and a downward water spray, as in a practical sprinkler system, using large-eddy simulations. The flow field is described with threedimensional unsteady Navier-Stokes equations, and chemical reactions represented by finite rate chemistry. Coupling of mass, momentum and energy between the Eulerian flow and Lagrangian droplets has been taken into consideration. Dynamic subgrid scale models are employed to better describe the unsteady and local interactions without manually tuning model constants. It was found that small droplets of a diameter of 400 ?m have poor penetration capacity, while larger droplets of a diameter of 800 ?m are quite effective for fire suppression. Budget analyses of the grid scale kinetic and thermal energy reveal complex non-linear interactions between the fire plume and water droplets
9780955749728
University of Edinburgh
Xia, J.
ab23d6f5-1c9b-4f1e-8d6a-47606c9429d7
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
Kumar, S.
695e30ec-08ac-4ad7-9f6b-b18dc52bcd0b
Bradley, D.
Drysdale, D.
Molkov, V.
Carvel, R.
Xia, J.
ab23d6f5-1c9b-4f1e-8d6a-47606c9429d7
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
Kumar, S.
695e30ec-08ac-4ad7-9f6b-b18dc52bcd0b
Bradley, D.
Drysdale, D.
Molkov, V.
Carvel, R.

Xia, J., Luo, K.H. and Kumar, S. (2008) Large-eddy simulation of interactions between a reacting plume and water spray. Bradley, D., Drysdale, D., Molkov, V. and Carvel, R. (eds.) In Proceedings of the 5th International Seminar on Fire and Explosion Hazards. University of Edinburgh..

Record type: Conference or Workshop Item (Paper)

Abstract

Study on water-based residential fire suppression system has received renewed attention due to environmental benefit. The progress on gaining detailed knowledge of this complex system, however, has been relatively slow. The objective of this paper is to pursue a better understanding of the interaction mechanisms between an upward reacting plume and a downward water spray, as in a practical sprinkler system, using large-eddy simulations. The flow field is described with threedimensional unsteady Navier-Stokes equations, and chemical reactions represented by finite rate chemistry. Coupling of mass, momentum and energy between the Eulerian flow and Lagrangian droplets has been taken into consideration. Dynamic subgrid scale models are employed to better describe the unsteady and local interactions without manually tuning model constants. It was found that small droplets of a diameter of 400 ?m have poor penetration capacity, while larger droplets of a diameter of 800 ?m are quite effective for fire suppression. Budget analyses of the grid scale kinetic and thermal energy reveal complex non-linear interactions between the fire plume and water droplets

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More information

Published date: September 2008
Venue - Dates: 5th International Seminar on Fire and Explosion Hazards, Edinburgh, UK, 2007-04-22 - 2007-04-26

Identifiers

Local EPrints ID: 48573
URI: http://eprints.soton.ac.uk/id/eprint/48573
ISBN: 9780955749728
PURE UUID: 52fac416-030a-4f8f-b317-198fe023783e

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Date deposited: 23 Oct 2009
Last modified: 11 Dec 2021 16:49

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Contributors

Author: J. Xia
Author: K.H. Luo
Author: S. Kumar
Editor: D. Bradley
Editor: D. Drysdale
Editor: V. Molkov
Editor: R. Carvel

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