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LII信号延迟与石蜡燃烧碳烟生成的研究 预览

Study on signal delay of laser induced incandescence and soot of paraffin
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摘要 为了研究扩散火焰中的碳烟体积分数的分布,搭建了一套激光诱导炽光(LII)二维测试系统,同时,为了尽可能地排除干扰火焰稳定的因素,特选用石蜡作为研究对象,对不同激光能量对应的炽光信号延迟和火焰图像进行了对比分析。研究结果表明,激光波长532nm、脉冲能量30mJ、能量密度0.2J/cm2所对应的炽光信号延迟为最佳延迟,其延迟时间为158μs。基于双色测温原理并结合激光诱导炽光法对碳烟的分析结果表明,大气环境压力下,石蜡火焰中二维碳烟体积分数分布在火焰中部呈M型双峰分布,且在两侧最外围和中间碳烟体积分数为0。利用MATLAB建立的碳烟体积分数计算数学模型可用于分析炽光信号曲线和火焰图像的分析。 A two dimensional test system for laser induced incandescence(LII)was built to study the distribution of soot volume fraction in diffusion flame.In order to eliminate the interference factors of flame stability as much as possible,paraffin was chosen as the study object.The incandescence signal corresponding to different laser energy and the flame image were compared.The results show that the delay of incandescence signal with energy density of 0.2 J/cm 2 at the laser wavelength of 532 nm and pulse energy of 30mJ is optimum,and its delay time is 158μs.Based on the principle of two-color temperature measurement and laser-induced incandescence,the distribution of two dimensional soot volume fractions in the central flame is obtained at atmospheric pressure.A mathematical model for soot volume fraction calculation is established and the signal curve and flame images are analyzed in MATLAB.
作者 徐睿 魏胜利 陶平 冷先银 XU Rui;WEI Sheng-li;TAO Ping;LEN Xian-yin(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China;Institute for Energy Research,Jiangsu University,Zhenjiang 212013,China)
出处 《广西大学学报:自然科学版》 北大核心 2018年第5期1723-1728,共6页 Journal of Guangxi University(Natural Science Edition)
基金 江苏省六大人才高峰高层次人才项目(JXQC-010)。
关键词 激光诱导炽光法 双色法 信号延迟 碳烟体积分数 laser induced incandescence two-color method signal delay soot volume fraction
作者简介 通讯作者:魏胜利(1978-),男,陕西凤翔人,江苏大学副教授,博士;E-mail:weishengli@ujs.edu.cn。
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