Extinguishment mechanisms of coflow diffusion flames in a cup-burner apparatus

Takahashi, Fumiaki; Linteris, Gregory T.; Katta, Viswanath R.

doi:10.1016/j.proci.2006.08.112

Cited by 70 publications

(73 citation statements)

References 13 publications

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“…대표적으로 Saito 등 (10) 은 N 2 , Ar, CO 2 및 이들의 혼합물에 대한 소화농도를 측정하고, 불활성기체의 소화특 성을 단열 화염온도롤 통해 표현할 수 있음을 확인하였으 며, Senecal (11) 은 불활성기체의 열적 소화효과의 관점에서 소화약제의 열용량에 따른 소화성능 예측을 시도하였다. 소화현상 이해를 위한 물리적 접근과 관련하여 Takahashi 연구그룹 (12)(13)(14) 은 불활성기체가 적용된 CH 4 . 선행연구결과를 바탕으로 통상 40 L/min의 공기 유량이 표준조건으로 적용되고 있다 (4) .…”

Section: 서 론unclassified

Quantitative Difference in the Extinguishing Concentration of Inert Gases with Fire Suppression Criteria in a Cup Burner Test

Cho¹,

Hwang

2014

Fire Science and Engineering

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Quantitative differences in the extinguishing concentration with fire suppression criteria (i.e. blow-out or onset of flame instability) were also examined. It was found that the difference in extinguishing concentration was increased with the appearance of lifted flame and the low extinguishing performance of inert gaseous. The maximum difference in extinguishing concentration with the suppression criteria was approximately 35% at the highest fuel velocity condition (1.3 cm/s) for the C 3 H 8 -air nonpremixed flame. It can be also expected that the extinguishing concentration by the criteria based on the onset of flame instability will provide the useful information from the viewpoint of the accurate and economical design concentration.

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Section: 서 론unclassified

Quantitative Difference in the Extinguishing Concentration of Inert Gases with Fire Suppression Criteria in a Cup Burner Test

Cho¹,

Hwang

2014

Fire Science and Engineering

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“…The steel fuel cup was filled with 3 mm glass beads covered with two layers of stainless steel wire mesh (41 Mesh, 0.22 mm wire diameter). This modification was adopted from [1,2] in order to achieve a uniform inlet velocity profile of gaseous fuel. The dimensions of the cup-burner device given by the standards [4,5] remained unchanged.…”

Section: Methodsmentioning

confidence: 99%

“…Our investigations are focused on a methane cup-burner flame [1,2] under ultra-low initial Froude number conditions resulting from the combination of low fuel inlet velocity and geometry of the burner characterized by a relatively large fuel nozzle diameter. In the presence of gravitational force, periodic pulsations (described as varicose mode instabilities [3]) are induced in buoyant nonpremixed flames.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations and numerical simulations of methane cup-burner flame

Bitala

Kozubková

Kadeřábek

et al. 2013

EPJ Web of Conferences

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Abstract. Pulsation frequency of the cup-burner flame was determined by means of experimental investigations and numerical simulations. Simplified chemical kinetics was successfully implemented into a laminar fluid flow model applied to the complex burner geometry. Our methodical approach is based on the monitoring of flame emission, fast Fourier transformation and reproduction of measured spectral features by numerical simulations. Qualitative agreement between experimental and predicted oscillatory behaviour was obtained by employing a two-step methane oxidation scheme.

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“…The slightly higher value for CO 2 was attributed to radiative heat loss due to CO 2 . Takahashi et al [17] took a similar approach for methane flames using UNICORN code in conjunction with GRI-V1.2 reaction mechanism, and found CFT values of 1602, 1728, 1630, and 1654 C for Ar, He, N 2 , and CO 2 , respectively. The CFT values used in this study were 1560 C for n-heptane, and 1630 C for methane.…”

Section: Minimum Extinguishing Concentrationsmentioning

confidence: 99%

“…The CFT values used in this study were 1560 C for n-heptane, and 1630 C for methane. These values were also applied for the halocarbon agents, although for example [17] suggests that the CFT for CHF 3 in a methane flame is 1836 C.…”

Section: Minimum Extinguishing Concentrationsmentioning

confidence: 99%

CFD Simulations on Extinction of Co-Flow Diffusion Flames

Vaari¹,

Floyd²,

McDermott³

2011

Fire Safety Science - Proceedings of the 10th International Sym

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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.

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Extinguishment mechanisms of coflow diffusion flames in a cup-burner apparatus

Cited by 70 publications

References 13 publications

Quantitative Difference in the Extinguishing Concentration of Inert Gases with Fire Suppression Criteria in a Cup Burner Test

Quantitative Difference in the Extinguishing Concentration of Inert Gases with Fire Suppression Criteria in a Cup Burner Test

Experimental investigations and numerical simulations of methane cup-burner flame

CFD Simulations on Extinction of Co-Flow Diffusion Flames

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