摘要
激光诱导炽光法作为一种非接触激光诊断技术,可以用来测量火焰中的二维碳烟体积分数分布,具有高的时间和空间分辨率.对于定量碳烟体积分数测试,需要对LII信号进行校准,来获得绝对的二维碳烟体积分数分布.近年来一种基于双色测温原理的校准方法由于具有实现简单、测试精度高、可以在线进行标定等特点得到推广和使用.搭建了一套LII二维测试系统,获得了乙烯扩散火焰的碳烟体积分数分布二维图像.根据双色测温原理采用校准系统,对二维碳烟分布图像进行标定,获得绝对碳烟体积分数.结果显示,乙烯火焰中的碳烟最浓区分布在火焰的外侧,碳烟体积分数随火焰高度增加而增大,达到最大值后碳烟体积分数在氧化作用下开始逐渐降低,直至完全消失.研究结果验证了此套LII测试系统的有效性,可以用来进行碳烟体积分数定量测试.
As a non-intrusive laser diagnostics technology, laser induced incandescence （LII） can be used to measure soot concentration distribution in flame, with high spatial and temporal resolution. For quantitative measurement of soot concentration, LII signal is needed to be calibrated to get 2D soot volume fraction distribution. In recent years, a new calibration method based on the two-color pyrometry theory has been proposed and gained popularity due to its high precision, simple equipment and on-line calibration. In the paper, a 2D-LII system is developed to get 2D soot distribution in a laminar ethylene diffusion flame. A calibration system based on the two-color pyrometry theory is used to calibrate 2D soot distribution, and 2D soot volume fraction of flame is then acquired. The results show that rich soot concentration is distributed in the wings of ethylene flame, and that soot volume fraction increases with the height of flame until it reaches the maximum. Then it begins to decrease because of oxidation. The research shows that the LII system works well, and can be used to measure soot quantitative concentration.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2009年第4期344-349,共6页
Journal of Combustion Science and Technology
基金
中国博士后科学基金资助项目(20070410058)
关键词
激光诱导炽光法
碳烟
扩散火焰
燃烧
laser induced incandescence （LII）
soot
diffusion flame
combustion
