化工学报2016，Vol.67Issue(9)：3590-3597,8.DOI:10.11949/j.issn.0438-1157.20151926
同轴管甲烷逆流燃烧器中火焰结构与燃烧稳定性
Flame stability and structure of opposed methane/air jet in coaxial tubes
摘要
Abstract
By using the skeletal reaction mechanism, the combustion in an opposed methane jet in coaxial narrow air stream tubes is studied. The temperature, species distribution, heat flux, flame stretch rate and flame curvature are calculated. When the fuel flow rate (QF)=120 ml·min−1, with increasing QA, the flame changes from flat-disk shape to curved one and covers the inner tube exit, and the flame is forced to move toward the exit of inner pipe. The flame is compressed and the distributions of temperature and species are compact. When equivalence ratio (ER)>1.00, with increasing QA, the peak temperature and the flame length along the flame surface rise and reach the maximum, while when ER≤1.00, the peak temperature and the flame length decrease. The after burning gas preheats the inlet methane through the inner pipe and the total heat flux is influenced by the flame temperature and gas flow. With the increase ofQA, the heat flux is much stronger and the preheating increases, reaching the maximum whenQA =2450 ml·min−1. WhenQA>2450 ml·min−1, the preheating goes down. When ER>1.00, the stretch rate of flameκ is small and changes slowly at the beginning, and then it rises sharply along the flame surface but finally it is no more than 65 s−1. When ER≤1.00, along the flame surface,κincreases first and then decreases, and finally become negative with the minimum value of−262 s−1. The increase ofQA makesκ change seriously. The maximum ofκis 638 s−1.关键词
甲烷/数值模拟/传热/逆流/燃烧状态/火焰拉伸率Key words
methane/numerical simulation/heat transfer/opposed flow/combustion characteristics/flame stretch分类
能源科技引用本文复制引用
黄景怀,李军伟,陈新建,魏志军,王宁飞..同轴管甲烷逆流燃烧器中火焰结构与燃烧稳定性[J].化工学报,2016,67(9):3590-3597,8.基金项目
国家自然科学基金项目（50906004）。@@@@supported by the National Natural Science Foundation of China (50906004) （50906004）
