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http://dx.doi.org/10.7731/KIFSE.2012.26.4.055

A Numerical Study on the Extinguishing Effects of CO2 in Counterflow Diffusion Flames with the Concept of Local Application System  

Mun, Sun-Yeo (Dept. of Fire & Disaster Prevention, Daejeon University)
Park, Chung-Hwa (Dept. of Fire & Disaster Prevention, Daejeon University)
Hwang, Cheol-Hong (Dept. of Fire & Disaster Prevention, Daejeon University)
Oh, Chang-Bo (Dept. of Safety Engineering, Pukyong National University)
Publication Information
Fire Science and Engineering / v.26, no.4, 2012 , pp. 55-62 More about this Journal
Abstract
The suppression mechanisms of carbon dioxide ($CO_2$) as a representative fire suppression agent were revisited using a counterflow diffusion flame which could be applied the concept of a local application system. To end this, the low strain rate $CH_4$/air counterflow diffusions with $CO_2$ addition in either fuel or oxidizer stream were examined numerically using detailed-kinetic chemistry. Radiative heat loss due to radiating gas species including $CO_2$ added was considered by the optically thin model (OTM). As a result, the critical $CO_2$ volume fractions in the oxidizer stream required to extinguish the flame were in good agreement with the experimental data reported in the literature, while somewhat under-prediction was observed with $CO_2$ added in the fuel stream. The surrogate agents were adopted to estimate the quantitative contribution with changing in global strain rate ($a_g$) on the flame extinguishment among pure dilution effect, thermal effects including radiation heat loss and chemical effect due to the $CO_2$ fire suppression agent.
Keywords
$CO_2$ fire suppression agent; Local application system; Counterflow diffusion flame;
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