利用Sirion200 型场发射扫描电子显微镜拍摄细水雾作用前后柴油和聚氯乙烯（PVC）材料烟颗粒的形貌和内部结构图像。定义了烟颗粒的采样平均直径（dA）和表面密度（ρS），利用统计分析的方法计算了细水雾作用前后烟颗粒的dA和ρS，研究了采样点空间位置、细水雾工作压力、雾滴粒径和雾滴速度等因素对dA和ρS的影响规律，揭示了细水雾冲刷火灾烟颗粒的主导机理，为细水雾技术用于计算机房等电气环境的火灾烟气抑制提供了科学的参考依据。

The micrographs of diesel oil soot particles were achieved by transmission scanning electron microscope with and without water mist applied. It was seen by statistical analysis that the average diameter of soot particle increased and the surface density of soot particle decreased with water mist applied. The experimental results show that water mist washes out smoke mainly by dynamics effect，cloud physics effect and transportation mechanism of Steffen flow. This paper provides scientific references for water mist technology using in smoke scrubbing of computer room fires.