利用木垛火研究隧道纵向通风条件下的燃烧过程

利用不同孔隙和高度的木垛在缩尺度实验空间内进行模拟实验,研究可燃物结构对隧道火灾燃烧过程的影响．实验结果表明,在一定的纵向通风风速下,木垛孔隙对燃烧过程中温度及CO浓度的变化都有重要影响,木垛的燃烧时间以及木垛火焰蔓延速度与木棍截面边长呈幂指数关系,木垛稳定燃烧的时间同时受木垛孔隙和高度的影响．对实验结果的分析,可以为隧道火灾的防治提供重要依据．

Combustion Process Under Longitudinal Ventilation in Tunnel Using Wood Crib Fire

A series of simulative experiments have been done using wood cribs with different porosities and heights in order to study the effect of combustible configuration on combustion process of tunnel fire. The results indicate that under certain longitudinal ventilation wood crib porosity has main influence on temperature and CO concentration during combustion process. The power exponential relation is fit approximately between stick cross-section size and combustion duration as well as flame spread rate, but then stable combustion duration depends on both the porosity and height. The experiments can afford important references for tunnel fire safety research.