A general calorimetry framework for measurement of combustion efficiency in a suppressed turbulent line fire

White, James P.; Link, Eric; Trouvé, Arnaud; Sunderland, Peter B.; Marshall, André W.

doi:10.1016/j.firesaf.2017.06.009

Cited by 28 publications

(18 citation statements)

References 42 publications

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“…The study considers an experimental configuration developed at the University of Maryland (UMD) [9,10] and corresponding to a buoyant, turbulent, methanefueled line fire exposed to air-nitrogen mixtures of variable oxygen strength.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Vilfayeau

White

Sunderland

et al. 2016

Fire Safety Journal

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The general objective of this project is to support the development and validation of large eddy simulation (LES) models used to simulate the response of fires to the activation of suppression systems. The focus here is on suppression by gaseous agents. The present experimental configuration is a two-dimensional, plane, buoyancy-driven, methane-fueled, turbulent diffusion flame with a controlled co-flow. The co-flow is an air-nitrogen mixture with variable oxygen dilution conditions, including conditions that lead to full flame extinction. Experimental measurements include the global combustion efficiency and global radiative loss fraction. The numerical simulations are performed with a LESbased fire model developed by FM Global and called FireFOAM. In this study, FireFOAM is modified to include a flame extinction model based on the concept of a critical flame Damköhler number and a flame reignition model based on the concept of a critical gas temperature. The numerical simulations are found to successfully reproduce the rapid change that is observed experimentally when exposing the flame to a co-flow with decreasing oxygen strength: the change corresponds to an abrupt transition from a strong flame with a global combustion efficiency close to one to a residual flame with a global combustion efficiency close to zero.

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Section: Introductionmentioning

confidence: 99%

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Vilfayeau

White

Sunderland

et al. 2016

Fire Safety Journal

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“…Figure 9 presents simulated η comb for each case plotted versus

X_{O_{2}}^{ox}

and compared against experimental data [21], which depict a plateau of constant η comb ≈ 1 for

X_{O_{2}}^{ox} > 0.14

. Between

X_{O_{2}}^{ox} = 0.14

and

X_{O_{2}}^{ox} = 0.125

, a sharp drop in η comb occurs, tapering briefly before global extinction ( η comb = 0), occurring at

X_{O_{2}}^{ox} \approx 0.12

.…”

Section: Resultsmentioning

confidence: 99%

“…1 [20, 21]. This configuration provides the suppression of a buoyant, turbulent, methane diffusion flame via nitrogen dilution of the oxidizer.…”

Section: Modeling Approachmentioning

confidence: 99%

“…Available measurement data to support model validation include local thermocouple temperatures, measured via exposed-junction 1.0 mm bead-diameter K-type thermocouple probes (uncertainty ±2 K; response time ±3 s); local oxygen mole fractions, measured using a sampling probe connected to the aforementioned oxygen analyzer; global radiative loss fraction, measured via heat flux transducer combined with infrared flame imaging and an analytical multipoint radiation source model [20]; global combustion efficiency, measured via carbon dioxide generation calorimetry [21]; and the value of

X_{O_{2}}^{ox}

at extinction, termed the limiting oxygen index ( LOI ).…”

Section: Modeling Approachmentioning

confidence: 99%

“…The issue of spurious reignition, its significance in determining simulated extinction performance, and available means for its prevention are the primary focus of the present work, which comprises a comprehensive evaluation of simulated flame suppression performance via comparisons of numerical results against recent experimental measurements [20, 21]. …”

Section: Introductionmentioning

confidence: 99%

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Modeling flame extinction and reignition in large eddy simulations with fast chemistry

White

Vilfayeau

Marshall

et al. 2017

Fire Safety Journal

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This work seeks to support the validation of large eddy simulation models used to simulate fire suppression. The emphasis in the present study is on the prediction of flame extinction and the prevention of spurious reignition using a fast chemistry, mixing-controlled combustion model applicable to realistic fire scenarios of engineering interest. The configuration provides a buoyant, turbulent methane diffusion flame within a controlled co-flowing oxidizer. The oxidizer allows for the supply of a mixture of air and nitrogen, including conditions for which oxygen-dilution in the oxidizer leads to flame extinction. Measurements to support model validation include local profiles of thermocouple temperature and oxygen mole fraction, global combustion efficiency, and the limiting oxygen index. The present study evaluates the performance of critical-flame-temperature-based extinction and reignition models using the Fire Dynamics Simulator, an open-source fire dynamics solver. Alternate model cases are explored, each offering a unique treatment of extinction and reignition. Comparisons between simulated results and experimental measurements are used to evaluate the capability of these models to accurately describe flame extinction. Of the considered cases, those that include provisions to prevent spurious reignition show excellent agreement with measured data, whereas a baseline case lacking explicit reignition treatment fails to predict extinction.

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Call for Participation in the Second Workshop Organized by the IAFSS Working Group on Measurement and Computation of Fire Phenomena

Merci

Trouvé

2019

Fire Technol

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Early 2015, a new initiative called ''the IAFSS Working Group on Measurement and Computation of Fire Phenomena'' (aka the MaCFP Working Group) was launched (http://www.iafss.org/macfp/). This initiative is endorsed and supported by the International Association for Fire Safety Science (IAFSS, http://www.iafss. org). The first workshop organized by the MaCFP Working Group was held in June 2017 as a pre-event to the 12th IAFSS Symposium in Lund, Sweden. Details are found on https://iafss.org/3770-2/ and in Ref. [1]. The primary objective of this letter is to engage the members of the fire research community to participate in the second MaCFP workshop, scheduled on April 25-26 2020 as a pre-event to the 13th IAFSS Symposium in Waterloo, Canada (http://iafss2020.ca). Continued updated information on the MaCFP Working Group effort is found at http:// www.iafss.org/macfp/.

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A general calorimetry framework for measurement of combustion efficiency in a suppressed turbulent line fire

Cited by 28 publications

References 42 publications

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

Modeling flame extinction and reignition in large eddy simulations with fast chemistry

Call for Participation in the Second Workshop Organized by the IAFSS Working Group on Measurement and Computation of Fire Phenomena

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