Among the primary phenomena observed when studying fire suppression are fuel surface cooling, fire plume cooling and inerting effects. The last two result from water evaporation generating a significant vapor concentration, thus leading to an important heat sink as well as displacement and dilution of both oxygen and fuel vapor. Fire Dynamics Simulator (FDS.v6) is expected to be able to reproduce these effects. Extinguishment criterion focusing on plume cooling and inerting effects is based on a dedicated heat balance, whereas suppression model related to fuel surface cooling evaluates the burning rate decrease according to an exponential law taking into account local water mass reaching the fuel surface per unit area and an empirical constant which penalizes the prediction ability. Therefore, a new model derived from an Arrhenius equation has been implemented, which links the burning rate to the fuel surface temperature. Numerical simulations are conducted and compared with experimental data for all extinguishing mechanisms.
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机译：在研究灭火时观察到的主要现象包括燃料表面冷却，火羽冷却和惰化效应。最后两个是由水蒸发产生的蒸汽浓度引起的，从而导致重要的散热器以及氧气和燃料蒸汽的置换和稀释。 Fire Dynamics Simulator（FDS.v6）有望能够重现这些效果。着重于羽流冷却和惰化效果的灭火标准是基于专用的热平衡，而与燃料表面冷却有关的抑制模型则根据指数定律评估燃烧速率降低，并考虑了到达单位面积燃料表面的局部水量和不利于预测能力的经验常数。因此，已经实现了从阿伦尼乌斯方程派生的新模型，该模型将燃烧速率与燃料表面温度联系在一起。进行了数值模拟，并与所有灭火机理的实验数据进行了比较。
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