CFD simulations on extinction of co-flow diffusion flames

Jukka Vaari, J. Floyd, R. McDermott

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

12 Citations (Scopus)

Abstract

An improved flame extinguishing criterion is implemented to the Fire Dynamics Simulator (FDS) for gaseous suppressants under the lumped species model with transport-limited combustion (infinitely fast chemistry). The criterion considers the total enthalpy of gas mixture as a function of temperature, and evaluates whether a limiting adiabatic flame temperature can be obtained due to combustion in a cell. The model is validated against a number of experiments in the cup-burner apparatus, a standard means of obtaining the minimum flame-extinguishing concentrations (MEC) for a variety of fuel-suppressant combinations. The results indicate that the model can reproduce the MEC values for all common inert gas agents, as well as some of the fluorinated halocarbon agents. It is further demonstrated in the paper that the flame extinguishment criterion, although validated using grid cells on the order of 1 mm, is equally applicable to larger cell sizes more appropriate for full-scale simulations. This improves the capability of FDS to predict the performance of full-scale fire suppression systems
Original languageEnglish
Pages (from-to)781-793
JournalFire Safety Journal
Volume10
DOIs
Publication statusPublished - 2011
MoE publication typeA4 Article in a conference publication
Event10th International Symposium on Fire Safety Science - College Park, MD, United States
Duration: 19 Jun 201124 Jun 2011

Fingerprint

diffusion flames
extinguishing
charge flow devices
flames
Computational fluid dynamics
Fires
extinction
Simulators
Halocarbons
Adiabatic flame temperature
simulators
Noble Gases
simulation
cells
halocarbons
Inert gases
Fuel burners
Gas mixtures
flame temperature
Enthalpy

Keywords

  • CFD
  • cup-burner
  • inert gas
  • NFPA 2001
  • suppression

Cite this

Vaari, Jukka ; Floyd, J. ; McDermott, R. / CFD simulations on extinction of co-flow diffusion flames. In: Fire Safety Journal. 2011 ; Vol. 10. pp. 781-793.
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CFD simulations on extinction of co-flow diffusion flames. / Vaari, Jukka; Floyd, J.; McDermott, R.

In: Fire Safety Journal, Vol. 10, 2011, p. 781-793.

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

TY - JOUR

T1 - CFD simulations on extinction of co-flow diffusion flames

AU - Vaari, Jukka

AU - Floyd, J.

AU - McDermott, R.

PY - 2011

Y1 - 2011

N2 - An improved flame extinguishing criterion is implemented to the Fire Dynamics Simulator (FDS) for gaseous suppressants under the lumped species model with transport-limited combustion (infinitely fast chemistry). The criterion considers the total enthalpy of gas mixture as a function of temperature, and evaluates whether a limiting adiabatic flame temperature can be obtained due to combustion in a cell. The model is validated against a number of experiments in the cup-burner apparatus, a standard means of obtaining the minimum flame-extinguishing concentrations (MEC) for a variety of fuel-suppressant combinations. The results indicate that the model can reproduce the MEC values for all common inert gas agents, as well as some of the fluorinated halocarbon agents. It is further demonstrated in the paper that the flame extinguishment criterion, although validated using grid cells on the order of 1 mm, is equally applicable to larger cell sizes more appropriate for full-scale simulations. This improves the capability of FDS to predict the performance of full-scale fire suppression systems

AB - An improved flame extinguishing criterion is implemented to the Fire Dynamics Simulator (FDS) for gaseous suppressants under the lumped species model with transport-limited combustion (infinitely fast chemistry). The criterion considers the total enthalpy of gas mixture as a function of temperature, and evaluates whether a limiting adiabatic flame temperature can be obtained due to combustion in a cell. The model is validated against a number of experiments in the cup-burner apparatus, a standard means of obtaining the minimum flame-extinguishing concentrations (MEC) for a variety of fuel-suppressant combinations. The results indicate that the model can reproduce the MEC values for all common inert gas agents, as well as some of the fluorinated halocarbon agents. It is further demonstrated in the paper that the flame extinguishment criterion, although validated using grid cells on the order of 1 mm, is equally applicable to larger cell sizes more appropriate for full-scale simulations. This improves the capability of FDS to predict the performance of full-scale fire suppression systems

KW - CFD

KW - cup-burner

KW - inert gas

KW - NFPA 2001

KW - suppression

U2 - 10.3801/IAFSS.FSS.10-781

DO - 10.3801/IAFSS.FSS.10-781

M3 - Article in a proceedings journal

VL - 10

SP - 781

EP - 793

JO - Fire Safety Journal

JF - Fire Safety Journal

SN - 0379-7112

ER -