Improved understanding of thermal agent fire suppression mechanisms from detailed chemical kinetic modeling with idealized surrogate agents

Pitts, William M.

doi:10.1016/j.proci.2008.06.210

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…In addition to chemical effects, the halons also enhance flame quenching via thermal effects. A numerical study by Pitts and Williams 131 using Argon a flame suppressant revealed that 41% of the flame suppressing effect is due to the heat extraction property while 51% is due to dilution. The study concluded that information about a well-defined peak flame temperature could be used to approximate the amount of suppressant needed to extinguish the flame.…”

Section: Counterflow Diffusion/partially Premixed Flames Applicationsmentioning

confidence: 99%

Advances in understanding combustion phenomena using non-premixed and partially premixed counterflow flames: A review

Ravikrishna

Sahu

2017

International Journal of Spray and Combustion Dynamics

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Counterflow flames provide an ideal platform for understanding the flame structure and as a model to study the effect of physical and chemical perturbations on the flame structure. This article reviews the advances made in the understanding of combustion dynamics and chemistry through experimental and numerical studies in counterflow non-premixed and partially premixed flames. Key contributions on fundamental aspects such as extinction, ignition and effect of perturbations on the stability of diffusion flames are first summarized and analysed. The review then focuses on the progress made in the understanding of the effect of inert particles and flame suppressants on the flame characteristics. A review of detailed studies on edge flames facilitates further understanding of local quenching and re-ignition phenomena in highly turbulent flames. The influence of radiation model and unsteady flow-conditions on the flame kinetics and dynamics along with work on NO x kinetics has been discussed. The review also outlines that specific experiments need to be carried out over a wide range of conditions for further understanding and validation of numerical models.

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Section: Counterflow Diffusion/partially Premixed Flames Applicationsmentioning

confidence: 99%

Advances in understanding combustion phenomena using non-premixed and partially premixed counterflow flames: A review

Ravikrishna

Sahu

2017

International Journal of Spray and Combustion Dynamics

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“…In our internal report [2] as well as a manuscript submitted elsewhere for publication [4] detailed chemical kinetic modeling combined with idealized surrogate thermal agents is used to investigate mechanisms of extinction in more detail. By varying the properties of the surrogate, these agents were designed to cover an extremely wide range of extinguishing concentrations.…”

Section: Validity Of the Extinguishing Limit Flame Temperature Hypothmentioning

confidence: 99%

“…[2] Another facet of the investigation that utilized idealized surrogate agents to better understand the relative roles of dilution and extraction and the importance of heat extraction location relative to the flame front will be published elsewhere. [4] DETAILED CHEMICAL KINETIC MODELING…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Extinguishment by Thermal Agents Using Detailed Chemical Modeling of Opposed Jet Diffusion Flames

Pitts¹,

Yang²,

Bryant³

et al. 2008

Fire Saf. Sci.

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Detailed chemical kinetic modeling of methane planar opposed-jet laminar diffusion flames burning in air mixed with a variety of thermal agents is used to characterize their effects on maximum flame temperature and extinction behavior. The identification of a well-defined limit temperature allows extinguishing concentrations for buoyancy-dominated methane flames to be predicted. Predicted extinguishing volume fractions are shown to be in good agreement with experimental results for opposed flow methane flames. It is further demonstrated that the calculations provide reliable estimates of relative thermal agent extinguishing effectiveness for both methane coflow flames and liquid-fueled heptane flames burning in a surrounding coflow, even though the required volume fractions of a given agent can differ substantially from those predicted for the opposed flow methane flames. This is the case despite the fact that the extinction mechanisms for the opposed-flow (global flame extinction due to flame cooling) and coflow (blow off of an edge flame stabilized in the local flow field by a reaction kernel) flames are believed to be different. The results of the calculations demonstrate the dependence of extinguishment mechanism on the local flow fields at the flame and the need for thermal agents to lower the temperature of the flame zone to a well defined limit temperature.

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Investigation of Fire Extinguishment in Large Facilities based on Physical Scaling, Modeling and Testing

2016

Fire Technol

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Improved understanding of thermal agent fire suppression mechanisms from detailed chemical kinetic modeling with idealized surrogate agents

Cited by 7 publications

References 15 publications

Advances in understanding combustion phenomena using non-premixed and partially premixed counterflow flames: A review

Advances in understanding combustion phenomena using non-premixed and partially premixed counterflow flames: A review

An Investigation of Extinguishment by Thermal Agents Using Detailed Chemical Modeling of Opposed Jet Diffusion Flames

Investigation of Fire Extinguishment in Large Facilities based on Physical Scaling, Modeling and Testing

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