Fire Science and Engineering (한국화재소방학회논문지)

Korean Institute of Fire Science and Engineering (한국화재소방학회)
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Quantitative Difference in the Extinguishing Concentration of Inert Gases with Fire Suppression Criteria in a Cup Burner Test

컵버너시험에서 소화기준에 따른 불활성기체의 소화농도에 대한 정량적 차이

  • Received : 2014.02.18
  • Accepted : 2014.06.13
  • Published : 2014.06.30
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Abstract

The concentrations of inert gases ($N_2$, Ar, $CO_2$ and He) required to induce the flame instabilities such as swing, rotation, lifted and blow-out were measured in a cup burner nonpremixed flames for $CH_4$ and $C_3H_8$ fuels. 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 $C_3H_8$-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.

본 연구에서는 $CH_4$ 및 $C_3H_8$ 연료의 컵버너 비예혼합화염에서 Swing, Rotation, Lifted 및 Blow-out과 같은 화염 불안정성을 발생시키는 불활성기체($N_2$, Ar, $CO_2$ 및 He)의 농도를 측정하였으며, 소화기준(즉, 화염날림 또는 화염불안정성 개시)에 따른 소화농도의 정량적 차이를 검토하였다. 소화농도의 차이는 부상화염의 발생 그리고 낮은 소화성능의 불활성기체일수록 증가됨을 확인하였다. 소화기준에 따른 소화농도의 최대 차이는 $C_3H_8$-air 비예혼합화염의 최대 연료유속의 조건(1.3 cm/s)에서 약 35%이다. 또한 화염 불안정성의 개시를 기준으로 측정된 소화농도는 정확한 그리고 경제적 설계 농도의 관점에서 유용한 정보를 제공할 것으로 기대된다.

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References

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