一种考虑混合作用的烟气区域模型

摘要

火灾初期,热烟气层和冷空气层的界面并不明显,为考虑进这种混合作用对低层空气温度和有害组分的影响,提出三层区域模型.通过一个标量函数表征冷热层的混合行为,并确定冷热层间的物理量分布形态.用新模型对一个多室建筑火灾的算例进行模拟,并将结果与实验数据、传统两层区域模型CFAST以及场模型FLUENT的模拟结果进行对比,证明该模型适合模拟复杂建筑或空间的火灾烟气传播过程,并为将来的模型改进提供了参考.%At the initial stage of fire, the interface between hot smoke and cold air is not clear, to consider the influence of this mixing effect on the temperature of the lower layer of air and harmful components, a 3 layers zone model was proposed. A scalar function was used to characterize the mixing effect of cold and hot layer, and decide the factors distribution between the cold and hot layer. The model was used to simulate a fire in a building with several rooms, and the results were compared with the experiment data, CFAST and FLUENT results, which proved that the model can simulate the smoke transferring in complex building. The simulation can provide reference for model in the future.