煤粉射流火焰中碳烟浓度分布的LII测量  

Laser Induced Incandescence Measurement of Soot Distribution in a Coal Jet Flame

作　　者：许开龙 李卓然 张海[1] 吴玉新 罗开红 吕俊复[1] Xu Kailong1,Li Zhuoran1,Zhang Hai1,Wu Yuxin1,Luo Kaihong2,Lü Junfu1(1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China; 2. Center for Combustion Energy,Tsinghua University,Beijing 100084,Chin)

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084 [2]清华大学燃烧能源中心,北京100084

出　　处：《燃烧科学与技术》2018年第3期232-237,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51476088)

摘　　要：基于Hencken型平面携带流反应器,使用激光诱导白炽光法(LII)测量煤粉火焰的碳烟浓度,并研究了激光能量密度F对测量的影响及火焰中碳烟的分布.研究发现,在F≤0.15,J/cm2时,煤颗粒信号相对较弱,碳烟信号占主导;在F>0.15,J/cm2时,煤颗粒信号干扰较强.F=0.05~0.08,J/cm2是最优能量密度范围.对本携带流实验系统,碳烟颗粒在距离出口80,mm处出现,且集中于中心中线4,mm范围内,碳烟浓度随着高度的增加先增加后降低,并在120,mm达到峰值.The soot distribution in a coal jet flame was measured using laser induced incandescence （LII）technique based on a Hencken burner,and the effects of laser fluence（F）on soot measurement in coal flames were investigated. The results show that when F≤0.15 J/cm^2,the interference signal from coal particles is minor and the measured LII signal comes from soot particles. When F〉0.15,J/cm^2,the LII measurement of soot parti-cles is interfered by the LII signal of coal particles. The optimal laser fluence is found to be F=0.05-0.08,J/cm^2 in the present study. Soot particles start to appear at around 80,mm above the exit of the coal jet,and they are mainly formed within 4,mm near the centerline. The soot concentration along the centerline increases with h in the up-stream and then decreases in the downstream. The maximum soot concentration is found at h=120,mm.

关 键 词：激光诱导白炽光法 碳烟 煤粉气流 激光能量密度 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]