液体正庚烷在微细直管燃烧器中的燃烧特性研究  

Study of the Combustion Characteristics of Liquid N-heptane in a Tiny Straight Tube Type Burner

作　　者：赵俊英[1] 李军伟[1] 黄景怀[1] 王宁飞[1] 

机构地区：[1]北京理工大学宇航学院,北京100081

出　　处：《热能动力工程》2013年第2期164-170,218,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50906004)

摘　　要：为了解液体燃料在微小空间中的熄火和火焰传播特性,采用不同的外套管和多孔介质,在微细直管中对庚烷扩散火焰进行了实验研究。研究结果表明:随着庚烷流量的增加,火焰稳定位置逐渐向直管燃烧器出口移动,可燃极限先迅速增大又趋于不变。增加外套管可以有效扩展可燃极限,外套管的结构对火焰稳定性和可燃极限有很大影响。外套管层数越多,燃烧器散热量越小,火焰稳定性越好。此外,多孔介质的位置对火焰稳定性也有很大影响。庚烷喷嘴放置在多孔介质上游及多孔介质中时,液体庚烷的蒸发以及混合效果最好,可以得到更好的富燃极限。To learn the flame extinction and diffusion characteristics of liquid fuel in a micro space,various sleeve tubes and porous media were used.In a tiny straight tube,the diffused flame of heptane was experimentally studied.The research results show that with an increase of the flow rate of heptane,the stable location of the flame will gradually move to the outlet of the straight tube type burner,the flammable limits will first become wide at a high speed and then tend to be constant.To increase the number of the sleeve tubes can effectively expand the flammable limits and the structure of the sleeve tubes has a big influence on the flame stability and flammable limits.The more the number of the sleeve tubes,the smaller the heat quantity released from the burner.In addition,the location of the porous medium influences greatly the flame stability.When the nozzle of heptane is placed at the upper reaches of the porous medium or in it,the evaporation and mixing effectiveness of liquid heptane will be the best,thus obtaining a better oxygen-enriched combustion limit.

关 键 词：微细直管 正庚烷 燃烧 火焰稳定性 多孔介质 

分 类 号：TK16[动力工程及工程热物理—热能工程]