It is found that the air quantity increases with the HRR, and the consumption of oxygen increases too, this gives rise to the decrease of the average oxygen concentration in the stairwell.

• 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。