凹型建筑外立面火灾烟气蔓延特性研究

摘要

为了研究凹型建筑外立面火灾烟气蔓延特性,对高层建筑凹槽内火灾烟气"三场"数值模拟.研究表明:结构因子α(进深与槽宽之比)的变化导致凹型建筑结构内呈现不同的火灾烟气蔓延规律;当α为0 ~0.4时,建筑凹槽内的火灾烟气无烟囱效应;当α为0.6 ~1.2时,建筑凹槽内的火灾烟气呈现一定的烟囱效应,其火灾烟气温度场、CO浓度场、扩散速度场变化显著;当α>1.2的,建筑凹槽内的火灾烟气烟囱效应显著.%To study the fire smoke spread characteristics of facade in the concave building, the numerical simulation was carried out on the "three fields"of fire smoke in the groove of high-rise building.The results showed that with the change of the structure factor(the ratio of groove depth and width),different fire smoke spread laws presented in the concave building structure.When was in the range of 0-0.4,the fire smoke in the groove of the building had no the chimney effect.When was in the range of 0.6-1.2, the fire smoke in the groove of the building presented a certain chimney effect, and the temperature field,CO concentration field and diffusion velocity field of fire smoke changed significantly.When it was larger than 1.2,the chimney effect of fire smoke in the groove of the building was significant.