针对建筑物楼梯井内的火灾过程,采用大涡模拟方法,探讨了不同释热速率对楼梯井内火灾过程中空气卷吸量、楼梯井内平均氧气浓度、平均温度以及楼梯井内外最大压差的影响,分析了火灾烟气流动的动力学特征.研究结果表明,随着释热速率的增加,楼梯井空气卷吸量增加,但由于氧气的消耗量也在增加,导致楼梯井内平均氧气浓度降低.此外,释热速率越大,则楼梯井内温度越高,导致楼梯井内外最大压差增加,增强楼梯井的抽风拔力效应,加快了火灾烟气的蔓延.
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