摘要
利用实验及数值计算研究了当量比为1的正癸烷、正十一烷、正十二烷、正十四烷和正十六烷/空气混合气在具有确定温度边界微管流动反应器内的着火特性.研究分析了几种直链烷烃低流速弱火焰在0.1~0.5 MPa压力下的火焰结构、热释放率及反应特性.计算结果表明几种典型单组分燃料有相似的火焰结构.其弱火焰呈现冷焰、蓝焰和热焰这3个反应阶段.随压力增加,冷焰位置未出现显著偏移,蓝焰位置向低温段移动,热焰向高温段偏移.以正癸烷为对象深入分析了压力对高碳直链烷烃弱火焰各阶段反应特性的影响,研究发现压力增大时,冷焰热释放贡献率增大,热焰热释放贡献率减小.
The ignition characteristics of stoichiometric n-decane,n-undecane,n-dodecane,n-tetradecane and n-cetane/air mixtures in a micro flow reactor with a controlled temperature profile were studied experimentally and numerically.The mixtures were fixed at a low inlet flow velocity and the pressure varied from 0.1 to 0.5MPa.The flame structure,heat release rate and reaction characteristics of the fuels were investigated.The results reveal that the weak flames at a low flow velocity of the fuels show a similar structure.The weak flames of those fuels show three stages in oxidation processes,which are cool flame,blue flame and hot flame.With the increase of pressure,the position of the cool flame shows no remarkable change,the blue flame shifts to the low temperature region,and the hot flame shifts to the high temperature segment.The oxidation processes of the stoichiometric ndecane/air mixture was analyzed in detail to interpret the effect of pressure on the ignition characteristics of straight chain alkanes.It was found that the contribution of cool flame to the overall heat release increases with the increasing pressure,while that of hot flame decreases.
作者
刘筱璇
谢圣荣
李星
汪小憨
Liu Xiaoxuan;Xie Shengrong;Li Xing;Wang Xiaohan(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Nano Science and Technology Institute,University of Science and Technology of China,Suzhou 215123,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《燃烧科学与技术》
CAS
CSCD
北大核心
2022年第2期206-213,共8页
Journal of Combustion Science and Technology
基金
国家重点研发计划资助项目(2018YFB1501500).
关键词
大分子直链烷烃
着火特性
微管流动反应器
压力
数值计算
large molecular straight chain alkane
ignition characteristics
micro-flow reactor
pressure
numerical calculation
