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利用FDS模拟研究受限空间不同开口尺寸下的火溢流行为,并同现有的小尺寸实验结论进行对比分析。结果表明:当火灾总的热释放速率大于燃烧室内部的热释放速率时,室外可以得到稳定的火溢流现象;开口外墙有一定厚度时,通风因子较大,实际流入室内的空气质量流量基本满足理论值,通风因子较小,实际流入室内的空气质量流量损失较大,开口处燃烧行为的影响不可忽略;流入室内空气的燃烧参与率随着通风因子的增大而增大,超过一定值后基本稳定不变。模拟得到无量纲溢流火焰高度与热释放速率的关系与Lee小尺寸实验的数学模型大致吻合。
FDS simulation was used to study the fire overflow behavior under different opening sizes in confined space, and compared with the existing small-scale experimental results. The results show that when the total heat release rate of the fire is greater than the heat release rate inside the combustion chamber, a stable fire overflow phenomenon can be obtained outdoors. When there is a certain thickness of the open outer wall, the ventilation factor is larger and the actual air mass flow into the room Basically meet the theoretical value, the ventilation factor is small, the actual flow of air into the room a large loss of flow, the opening combustion behavior can not be ignored; the inflow of indoor air combustion rate increases with the ventilation factor increases over a certain The value of the basic stability unchanged. The relationship between the dimensionless overflow flame height and the heat release rate obtained by the simulation is in good agreement with the mathematical model of Lee’s small-size experiment.