Abstract A methodology is presented herein for the determination of flame extinction in fire simulations by utilizing the flame extinction propensity obtained from the counterflow flame experiments or calculations. The methodology leverages the fact that the flame extinction in hydrocarbon fires tends to occur at critical temperatures corresponding to the strain rates acting on the flames, under the condition that the flame extinction is caused only by physical effects such as dilution and heat extraction. The methodology calls for the correlations between the adiabatic flame extinction temperature and strain rate, a functional expression of the characteristic eddy strain rate in the buoyancy-induced turbulent flow, and the determination of local adiabatic flame temperatures in the fire. The methodology was evaluated by implementing the above application elements in FireFOAM, and comparing the resulted simulations to a previously published study on propane fire intensity in a nitrogen-diluted air environment. The evaluation is deemed favorable for the methodology to be used as an alternative for the flame extinction determination in fire simulations.

中文翻译：

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一种将逆流火焰熄灭倾向应用于火灾模拟中火焰熄灭确定的方法

摘要 本文提出了一种方法，用于通过利用从逆流火焰实验或计算中获得的火焰熄灭倾向来确定火灾模拟中的火焰熄灭。该方法利用了这样一个事实，即碳氢化合物火灾中的火焰熄灭往往发生在对应于作用在火焰上的应变率的临界温度下，条件是火焰熄灭仅由稀释和热提取等物理效应引起。该方法要求绝热火焰熄灭温度与应变率之间的相关性、浮力引起的湍流中特征涡应变率的函数表达式以及确定火灾中局部绝热火焰温度。通过在 FireFOAM 中实施上述应用程序元素，并将模拟结果与之前发表的有关氮气稀释空气环境中丙烷火灾强度的研究进行比较，对该方法进行了评估。该评估被认为有利于该方法用作火灾模拟中火焰熄灭确定的替代方法。