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An Investigation of the Extinction and Ignition Characteristics Using a Flame-Controlling Method

화염온도 제어법을 이용한 확산화염의 소화 및 점화특성 검토

  • Oh, Chang-Bo (Division of Safety Engineering, Pukyong National University) ;
  • Lee, Eui-Ju (Division of Safety Engineering, Pukyong National University) ;
  • Hwang, Cheol-Hong (Department of Fire and Disaster Prevention, Daejeon University)
  • 오창보 (부경대학교 안전공학부) ;
  • 이의주 (부경대학교 안전공학부) ;
  • 황철홍 (대전대학교 소방방재학과)
  • Received : 2010.09.22
  • Accepted : 2011.01.19
  • Published : 2011.02.28

Abstract

Extinction and ignition characteristics of $CH_4$-air counterflow diffusion flame were numerically investigated using a Flame-Controlling Method(FCM). A skeletal reaction mechanism, which adopts 17 species and 58 reactions, was used in the simulation. The extinction and ignition conditions of the $CH_4$-air diffusion flames were investigated with varying the global strain rate. Upper and middle branches of S-curve for the peak temperature in the inverse of the global strain rate space were obtained with the FCM. The structures of diffusion flames in the upper and middle branches of S-curve were compared. It was found that the global strain rate was not correlated with the local strain rate well in the low global strain rate region. It is expected that the FCM is very useful to obtaining the extinction and ignition condition of diffusion flame, such as fires.

Keywords

extinction;ignition;counterflow flame;diffusion flame;flame-controlling method;S-curve

Acknowledgement

Supported by : 한국연구재단

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