Large eddy simulation of flame extinction in a turbulent line fire exposed to air-nitrogen co-flow

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• 作者：S. Vilfayeau ; J.P. White ; P.B. Sunderland ; A.W. Marshall ; A. Trouvé ; ; ^{atrouve@umd.edu}
• 关键词：Buoyant turbulent diffusion flame ; Flame extinction ; Fire suppression ; Large eddy simulation ; FireFOAM
• 刊名：Fire Safety Journal
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：86
• 期：Complete
• 页码：16-31
• 全文大小：2691 K
• 卷排序：86

文摘

Numerical simulations of combustion efficiency were performed for buoyancy-driven turbulent diffusion flames with a controlled air-nitrogen co-flow, including conditions that lead to full flame extinction. Numerical simulations of combustion efficiency are performed for a laboratory flame. The numerical simulations used FireFOAM and a flame extinction model based on the concept of a critical flame Damköhler number and a flame reignition model based on the concept of a critical gas temperature. The numerical simulations use a flame extinction model and a flame reignition model. The numerical simulations were shown to reproduce the experimentally observed abrupt transition from a strong flame with a global combustion efficiency close to one to a suppressed flame with a global combustion efficiency close to zero.The numerical simulations show an abrupt transition from burning to extinction. The experimental extinction limit was Xo2=12.2%Xo2=12.2%; the numerical extinction limit was Xo2=11%Xo2=11%. The experimental oxygen limit is XO2 = 12.2%; the numerical limit is XO2 = 11%.