顶棚射流烟雾颗粒分布及其光散射特征  

Ceiling jet smoke particle distribution and light scattering characteristics

作　　者：沈诗林[1] 

机构地区：[1]佛山市消防支队,广东佛山528300

出　　处：《消防科学与技术》2014年第3期254-257,共4页Fire Science and Technology

摘　　要：实验测试了正庚烷火烟颗粒浓度及粒径分布的空间与时间特性,得到了颗粒粒径分布数中值粒径及几何标准差的变化,据此计算了正庚烷火烟雾光散射强度分布的特性。结果显示数中值粒径的增大引起散射光强明显增强,入射光波长越短散射强度也越强,光电感烟探测系统设计需要考虑入射光波长以及颗粒粒径分布的影响。To obtain the spatial and temporal distribution of flaming fire smoke generated by flaming n-heptane fire,experiments have been conducted for variation of the count median diameter and geometric standard deviation of smoke.Based on these results,the light scattering intensity of smoke has been calculated.The results shows that,along with the increase of the count median diameter,the scattering light intensity rise,meanwhile,a shorter wave length of incident light leads to a greater intensity.Therefore the influence of wave length and particle size distribution must be taken into account to the design of photoelectric smoke detecting system.

关 键 词：正庚烷池火 烟雾浓度 粒径分布 光散射 

分 类 号：X913.4[环境科学与工程—安全科学] TK121[动力工程及工程热物理—工程热物理]