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Computational modeling of smolder combustion and spontaneous transition to flaming

机译：阴燃和自发转变为燃烧的计算模型

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A numerical transport model was developed to study the spontaneous transition from smoldering to flaming combustion in polyurethane foam. The numerical transport model is two-dimensional with an eight-step reduced reaction mechanism. The reaction mechanism includes seven heterogeneous and a global homogeneous gas phase reaction and is capable of simulating both forward and opposed smoldering combustion. The current study examines the transition to flaming in normal gravity for flow assisted forward smoldering combustion as a function of an externally applied heat flux and the velocity and oxygen concentration of a forced gas flow. Reaction rates, species profiles, gas phase temperatures, and condensed phase temperatures are examined. Three reactions were found to play a major role in leading to the prediction of transition to flaming. Favorable agreement of temperature response, time to spontaneously transition from smolder to flaming, and location of the transition event between simulation results and experimental data is demonstrated.
机译：建立了数值输运模型，以研究聚氨酯泡沫从闷烧到燃烧的自发转变。数值传输模型是二维的，具有八步简化的反应机理。该反应机理包括七个非均相和整体均相气相反应，并且能够模拟正向和反向阴燃燃烧。当前的研究检查了流动辅助正向阴燃燃烧在正常重力下向火焰的转变，该燃烧是外部施加的热通量以及强制气流的速度和氧气浓度的函数。检查反应速率，物质分布，气相温度和冷凝相温度。发现三个反应在导致预测向燃烧过渡中起主要作用。证明了温度响应，从闷烧到燃烧自发转变的时间以及模拟结果与实验数据之间的转变事件的位置具有良好的一致性。

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