双区域模拟大空间火灾烟气下降和升温规律的分析

Analysis of the temperature curve and the position of the smoke layer in large space buildings based on two-zone fire model

利用以双区域模拟为基础的修正计算方法,对大空间建筑火灾进行计算,对得出的室内烟气下降和温度与时间的关系进行分析比较。通过比较得出:烟气下降的速度随着失火空间的增大而减小,随火源功率的增大而增大;平稳段烟气平均温度随着失火空间的增大而减小,随平稳段火源功率的增大而增大,但并不受火源增长速度影响。

Based on the revised two-zone fire model, this article calculated the large space building fires in different conditions and analyzed the pattern of the descent of the smoke layer and the average temperature-time curve of the smoke layer. The results indicated, the velocity of the descent of the smoke layer decreases as the volume of the space increases, and increases as the heat release rate dose; the average temperature of the smoke layer on the steady stage varies with the volume of the space and the hear release rare impervious to the increase rare of in a similar way, but it is the fire.