地下狭长封闭空间烟气填充模式可视化实验研究.pdfVIP

暖通空调HVAC 2010 年第40 卷第7 期 ∃ 15 ∃ * 中铁第一勘察设计院集团有限公司 李德辉 邓保顺 西安建筑科技大学 马江 李安桂 实验研究结果表明: 当模型的形状系数小于2 时, 烟气形成自上而下的填充方式, 烟气界 和水平 平行; 当形状系数大于等于2 时, 烟气形成狭长空间的填充方式, 而且形状 系数越大, 该填充方式越明显在两种烟气填充方式下, 烟气浓度分布特点不同: 形状系数小 于2 时, 烟气浓度在同一个水平 内分布相对均匀; 形状系数大于等于2 时, 烟气浓度在同一水 平 内分布很不均匀, 远离火源处的烟气浓度远高于火源附近区域的烟气浓度地下狭长封 闭空间的烟气填充方式对人员逃生不利,在制定地下建筑防火排烟逃生预案时应予以充分考虑 地下建筑 封闭空间 可视化 CO 浓度 模型实验 Vis uali zing experi ment of s moke fi ll ing processes in underg round long a nd narrow enclosed space By Li Dehui , Deng Baoshun, Ma Jiangyan andLi Angui Abstract The experiment results sho that smoke fills from top do n to bottom hen the model shape coefficient is less than 2 and the interface of smoke layer is horizontal, and that the long and narro enclosed space smoke filling mode ill be formed hen the shape coefficient is equal or greater than 2, and it is more obvious ith even larger shape coefficient. The distribution characteristics of smoke density in the t o modes are different. When the shape coeff icient is less than 2, the distribution of smoke density on the same horizontal plane is relatively unif orm, hile that is very nonuniform hen the shape coefficient is equal or greater than 2, the smoke density far a ay from the fire source is far higher than that near the fire source. The smoke filling mode in a long and narro enclosed space is unfavorable f or human evacuation under fire, so it should be considered fully hen the fire evacuation plan as drafted for underground spaces. Keywords underground building, enclosed space, visualization, CO concentration, model experiment * China Rail ay First Survey and Design Institute Gr