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为了能较为真实地描述火灾过程,采用固体可燃物热解动力学模型与大涡模拟方法,对多室内聚氨酯泡沫(PUF)板热解与空间火蔓延的相互作用进行了数值模拟。计算出了PUF板在外部热流作用下的瞬时质量变化速率,结果与实验相符合,计算得到的着火房间内烟气温度随时间的变化也与实验结果相符合。受空间火蔓延的影响,PUF板上表面的热流密度分布是不均匀的。PUF板的热解和形状改变先是从热流密度较高的板中心处开始,逐渐向周围扩展和蔓延,其热解和消耗也不是对称的。
In order to describe the fire process in a more realistic way, the pyrolysis kinetic model of solid combustibles and large eddy simulation method were used to simulate the interaction between pyrolysis of multi-room polyurethane foam (PUF) panels and space fire. The instantaneous mass change rate of PUF board under external heat flow was calculated. The results are in good agreement with the experimental results. The calculated flue gas temperature changes with time in the ignition room are consistent with the experimental results. Influenced by the spread of space fire, the heat flux density distribution on the surface of PUF board is not uniform. PUF board pyrolysis and shape changes from the higher heat flux density at the center of the board began to gradually spread and spread around the pyrolysis and consumption is not symmetrical.