한국화재소방학회논문지 (Fire Science and Engineering)

  • 제26권4호
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  • Pages.55-62
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  • 2012
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  • 2765-060X(pISSN)
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  • 2765-088X(eISSN)
한국화재소방학회 (Korean Institute of Fire Science and Engineering)
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국소방출방식 개념의 대향류 확산화염에서 CO2 소화효과에 관한 수치해석 연구

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)
  • 투고 : 2012.06.20
  • 심사 : 2012.08.13
  • 발행 : 2012.08.31
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초록

소화약제의 국소방출방식 개념이 적용될 수 있는 대향류 확산화염을 대상으로 $CO_2$ 소화약제의 소화기구를 재조명하기 위한 연구가 시도되었다. 이를 위해 연료 또는 공기류에 $CO_2$가 첨가된 낮은 총괄신장율의 $CH_4$/air 대향류 확산화염이 상세반응을 이용한 수치해석을 통해 검토되었다. 첨가된 $CO_2$를 포함한 복사 참여 화학종의 복사 열손실을 고려하기 위하여 optically thin model(OTM)이 적용되었다. 주요 결과로서, 공기류에 첨가된 $CO_2$의 소화농도 예측결과는 문헌에 보고된 실험결과를 적절하게 예측하고 있으나, 연료류에 첨가된 경우 다소 과소 예측된 결과를 확인하였다. 소화효과에 대한 정량적 분석을 위하여 가상의 소화약제의 개념이 도입되었다. $CO_2$ 소화효과의 분석을 통해 총괄신장율($a_g$)에 따른 순수 희석효과, 복사 열손실 및 열용량에 의한 열적효과 그리고 $CO_2$의 연쇄반응 억제를 통한 화학적 효과의 정량적 기여도를 구체적으로 확인할 수 있었다.

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.

키워드

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피인용 문헌

  1. Effect of Radiation Models on the Suppression Limits in Counterflow Methane/Air Diffusion Flames vol.28, pp.3, 2014, https://doi.org/10.7731/KIFSE.2014.28.3.020