摘要
采用三维定位快速插拔式热电偶对乙烯/空气反扩散火焰中不同点处气体温度进行测量,并基于热电偶颗粒沉积法原理,计算火焰中各测量点处碳烟体积分数,研究反扩散火焰中气体温度分布规律及碳烟体积分数随火焰轴向和径向的分布特征.研究结果表明,反扩散火焰中气体温度随轴向呈递减趋势,沿径向也呈递减趋势.燃烧器出口处由于出口效应造成中心区温度较低.碳烟体积分数与气体温度的分布呈负相关关系,随着轴向方向浓度不断增大,在火焰顶部出现最大值,且火焰外缘处碳烟体积分数高于中心区.说明低温有利于碳烟的形成,碳烟随着火焰的传播,完成了生成、长大和氧化的过程.
A three-dimensional positioning,fast insertion thermocouple was used to measure the gas tem-perature in ethylene/air inverse diffusion flame at different measuring points,and based on the theory of thermocouple particle densitometry,the soot fraction volume in the flame at different points were calculated,with the aim to study the distribution characteristics of gas temperature and soot fraction volume in the in-verse diffusion flame.The results have been shown that the gas temperature decreased in the axis direction,and so in the radius direction,and the gas temperature at the burner exit was low due to the exit effect.Soot fraction volume presented inverse correlation with gas temperature,it increased in the axis direction and got the maximum value at the flame tip,the values at flame front were higher than that of in the center,which showed low temperature promoted soot formation,soot incepted,grew and oxidized along with the flame propagated.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2011年第8期1011-1016,共6页
Acta Chimica Sinica
基金
国家留学基金委资助项目
关键词
反扩散火焰
碳烟
体积分数
热电偶颗粒沉积法
inverse diffusion flame
soot
fraction volume
thermocouple particle densitometry
