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http://dx.doi.org/10.14346/JKOSOS.2013.28.2.042

CO2 Suppression Characteristics of the Nitrogen-diluted Methane Counterflow Non-premixed Flame  

Lee, Ho-Hyun (Department of Safety Engineering, Pukyong National University)
Oh, Chang Bo (Department of Safety Engineering, Pukyong National University)
Hwang, Cheol Hong (Department of Fire and Disaster Prevention, Daejeon University)
Publication Information
Journal of the Korean Society of Safety / v.28, no.2, 2013 , pp. 42-48 More about this Journal
Abstract
The $CO_2$ suppression characteristics and flame structure of nitrogen-diluted methane counterflow non-premixed flame were studied experimentally and numerically. To mimic a situation where combustion product gases are entrained into a compartment fire, fuel stream was diluted with $N_2$. A gas-phase suppression agent, $CO_2$, was diluted in the air-stream to investigate the suppression characteristics by the agent. For numerical simulation, an one-dimensional OPPDIF code was used for comparison with experimental results. An optically-thin radiation model(OTM) was adopted to consider radiation effects on the suppression characteristics. It was confirmed experimentally and numerically that suppression limit decreased with increasing nitrogen mole fraction in the fuel stream. A turning point was found only when a radiation heat loss was considered and the extinguishing concentration for turning point was differently predicted compared to the experiment result. Critical extinguishing concentration when neglecting radiation heat loss was also differently predicted compared with the experimental result.
Keywords
suppression limit; nonpremixed counterflow flame; $CO_2$ suppression agent; flame; global strain rate;
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