C₁～C₄ 直链烷烃层流扩散火焰碳烟生成特性对比研究

Natural luminosity，laser induced incandescence (LII)and thermophoretic sampling were used to study the formation and evolution characteristics of soot particles in laminar diffusion flames based on a co-flow burner. Methane，ethane，propane and n-butane were used as fuels，respectively. The results show that with the increase of carbon chain length，the luminous area of the flame gradually increased，the high concentration area of soot gradually shifted downstream from the center of the flame to the wing of the middle part，and the peak concentration of soot increased significantly. Furthermore，through the transmission electron microscopy(TEM)image，it can be seen that the process of soot nucleation was advanced，and the overall particle size increased successively. The results show that although the soot particles in the propane flame nucleated slightly faster than those in the n-butane flame at the initial stage，the soot particles in propane flame reacted more quickly in the oxidation process.