本文对墙壁开口和顶棚开口两种情况下细水雾灭室内油盘火进行了实验研究。结果表明,无论开口位于墙壁还是顶棚,细水雾灭火时间均随着开口面积的增大而增大,随着火源热释放速率的增大而减小。当火源热释放速率小于某一临界值时,墙壁开口时的细水雾灭火时间比顶棚开口时的细水雾灭火时间长。而当火源热释放速率大于该临界值时,墙壁开口时的细水雾灭火时间小于顶棚开口时的细水雾灭火时间。分析认为,室内外气体交换能力的差异和燃烧室蓄烟能力的差异是导致墙壁开口和顶棚开口两种情况下灭火时间存在差异的原因。
Experiments have been carried out to investigate the effect of opening position on pool-fire suppression by water mist in a compartment.The results show that no matter whether the opening is located at the wall or the ceiling,the extinguishing time of the pool-fire increases with the opening area,and decreases with the HRR of the pool-fire.When the HRR of the pool-fire is lower than a critical value,the extinguishing time for wall opening case is longer than that for ceiling opening case.And the extinguishing time for the case of wall opening is less than that for ceiling opening case otherwise.Theoretical analysis shows that the differences in abilities of mass exchange inside and outside and abilities of storing smoke under the ceiling should be responsible for the differences in extinguishing time between the two cases.
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