单室火灾的燃烧特性  

Combustion characteristics for single room fire

作　　者：华敏[1,2] 殷志平[2] 潘仁明[2] 

机构地区：[1]南京工业大学火灾与消防工程研究所,江苏省城市与工业安全重点实验室,江苏南京210009 [2]南京理工大学化工学院,江苏南京210094

出　　处：《南京工业大学学报（自然科学版）》2012年第2期133-137,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：南京工业大学学科基金资助项目

摘　　要：通过实验研究火源功率及单室的通风状况对单室室内火灾燃烧时的温度变化及分布、烟气流动特性及气体成分的变化影响。结果表明:在全封闭情况下,热烟气以垂直流动为主,且随着热烟气的流动,室内温度逐渐升高,O2浓度逐渐降低。边界层不稳定导致的火焰振荡使热烟气层的最高温度出现在距离单室顶部70～80 cm处。火源功率越大,室内温度升高越快,升温幅度越高,火焰脉动进一步加剧,火焰偏移越大。在单室通风口打开的情况下,热烟气以水平流动为主,室内O2浓度和CO浓度变化不大,而以通风口上沿为界,温度分布呈现明显的上下2层。Temperature distribution,smoke flow characteristics and gas component in different parts of fire and the open condition were investigated.Hot smoke flowed vertically in close condition which led to temperature increasing and O2 concentration decreasing.Flame oscillation caused by boundary layer instability made the maximum temperature of hot smoke layer appear in the region about 70-80 cm apart from top.As fire power increased,indoor temperature elevation speed,temperature elevation scope,flame oscillation intensity,and flame deflection increased.Hot smoke flowed horizontally in the open condition,and O2 and CO concentrations almost unchanged.The temperature distribution was on two layers obviously nearby the top horizon of the open door.

关 键 词：单室火灾 烟气流动 气体成分 

分 类 号：TK121[动力工程及工程热物理—工程热物理]