C1~C4直链烷烃层流扩散火焰碳烟生成特性对比研究  

Comparative Study on Soot Formation Characteristics of C1-C4 Straight-Chain Alkanes Laminar Diffusion Flames

作　　者：闫治宇 王良辰 李倩倩[1] 黄佐华[1] Yan Zhiyu;Wang Liangchen;Li Qianqian;Huang Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《燃烧科学与技术》2022年第4期410-416,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51776163).

摘　　要：基于同轴扩散燃烧器,通过介绍使用火焰自发光、激光诱导炽光(laser induced incandescence,LII)和热泳取样3种方法,对比研究了甲烷、乙烷、丙烷和正丁烷层流扩散火焰的碳烟生成及颗粒形貌演变特性.研究结果表明:随着碳链长度的增加,火焰明亮区逐渐增大,碳烟高浓度区由火焰下游中心逐渐移至中部外侧,且碳烟峰值浓度明显增大.进一步通过TEM(transmission electron microscopy)图像可知碳烟颗粒成核提前,颗粒总体粒径依次增大,且结果表明,尽管丙烷火焰颗粒在成核初期会略快于正丁烷,但在氧化过程中,丙烷却表现得更为迅速.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 nbutane flame at the initial stage,the soot particles in propane flame reacted more quickly in the oxidation process.

关 键 词：直链烷烃 层流扩散火焰 自发光 激光诱导炽光 碳烟形貌 

分 类 号：TK431[动力工程及工程热物理—动力机械及工程]