火灾烟雾碳黑分形凝并自保尺度分布

Self-preserving size distribution of fire smoke soot fractal coagulation

将分形凝并理论首次应用分析火灾燃烧物有焰燃烧烟雾碳黑凝聚现象 ,从理论上证明了火焰区及火焰区上方两个不同区域内碳黑颗粒凝并均存在自保尺度分布 ,并分析求解得出归一化总颗粒数目浓度与无量纲时间的变化关系及从单谱分布达到自保尺度分布所需实际时间。结果表明 ,碳黑分形现象对碳黑凝并存在很大程度影响 ,在火焰区内对碳黑颗粒自保尺度分布、总数目浓度变化影响较大 ,在火焰区上方对从单谱分布达到自保尺度分布时间影响较大 。

The fractal coagulation theory was first applied to ana ly ze the fire smoke soot agglomeration of flame combustion,theoretically proved th at there exits self-preserving size distribution in the flame region and above the flame region.Additionallyacquiredtherelationshipbet ween the normalized number concentration of the total particles and thedimension less time as well as the actual time from monodisperse distribution to self-pre serving distribution.The results indicate that the soot fractal phenomenon affec ts the soot coaghulation to a large extent,which has a greater influence on soot self-preserving size distribution,total particle number concentration in the f lame region and the time from monodisperse distribution to self-preserving dist ribution above the flame respectively.The results provide a new way for the fire development research and detection technology.