摘要
利用分光成像系统,实时收集O2/CH4同轴射流扩散火焰辐射发光信息,重点讨论火焰中3种激发态自由基组分(OH*、CH*和C2*)的发光特征.探讨3种激发态自由基的产生机理;分析OH*、CH*和C2*的辐射强度随氧气/燃料当量比的变化,及其沿扩散火焰轴向分布特征等.结果表明:激发态自由基均由化学激发途径产生,其辐射发光为化学发光;OH*辐射发光强度随氧气/燃料当量比变化显著,可采用[OH*]/[CH*]表征当量比变化;OH*辐射强度可以作为扩散火焰化学反应区及高度的表征.
Luminescent emissions from three excited state radicals（OH＊, CH＊ and C2＊）have been measured in O2/CH4 co-flowing jet diffusion flames. The fiber optic spectrometer allowed global and simultaneous measurements of luminescence intensity in flames, which were used to analyze the excitation mechanisms of excited state radicals, the effect of OJCH4 equivalence ratio on the radiant intensity of OH＊, CH＊ and C2＂, and the distribution of radiant intensity along the flame axis. The results show that chemical excitations are the major excitation mechanisms of OH＊, CH＊ and C2＊, OH＊ emission changes significantly with and O2/CH4 equivalence ratio, [OH＊]/[CH＊] emis- sion intensity ratio is a good indicator of O2/CH4 equivalence ratio, and reaction zone and flame height can also be estimated by OH＊ emission intensity along the flame axis.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2012年第4期353-358,共6页
Journal of Combustion Science and Technology
基金
国家重点基础研究发展计划(973计划)资助项目(2010CB227004)
国家自然科学基金资助项目(20876048)
关键词
扩散火焰
化学发光
OH＊辐射
diffusion flame
chemiluminescentemission
OH＊ emission
