微细直管内甲烷/氧气燃烧的实验和数值模拟  

Experimental and numerical study of methane-oxygen combustion in a microtube

作　　者：李军伟[1] 钟北京[1] 

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《清华大学学报（自然科学版）》2007年第8期1370-1374,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50376027)

摘　　要：为了解微小燃烧室的工作特点,建立了微细直管的实验系统,采用氧气和甲烷气体进行了2种混合比的燃烧实验,实时采集壁面的温度分布。同时考虑微细直管内的燃烧、流动,以及与外界的换热,采用三维数值模拟方法对该微细直管燃烧室进行了数值计算,数值模拟结果与实验结果比较一致。研究结果表明:微细直管的内径较小,充分燃烧需要很长的微细直管;微细直管与外界的换热量很大,占总燃烧放热的40%左右,其中辐射换热量最大,占总换热量的70%,燃烧室需要采用低发射率的材料来减小辐射散热损失。Two mixture ratios of gaseous oxygen and methane were combusted in the micro-tube to study the micro-combustor characteristics. The wall temperatures of the micro-combustor were measured at various positions. A 3-D numerical simulation of the micro-tube combustion was also developed taking into account the combustion, flow and heat transfer in the micro-tube. The tests and numerical results showed that the small inner diameter of the micro-tube required a long tube to achieve complete combustion. The heat transfer between the micro-tube and the environment was very large, accounting for about 40% of the total combustion heat, the radiation heat loss was the largest, accounting for 70~ of the total heat losses. Therefore, low emissivity materials are necessary to reduce the radiation heat loss from the micro-combustor wall.

关 键 词：微小燃烧室 燃烧 数值模拟 甲烷 氧气 

分 类 号：TK16[动力工程及工程热物理—热能工程]