微细通道中甲烷预混火焰传播的实验  

Methane premixed flame propagation in a micro-scale tube

作　　者：王国锋[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）》2006年第2期276-279,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50376027);教育部博士点基金项目(20010003067)

摘　　要：对微细通道中甲烷/氧气(空气)预混火焰传播现象进行了实验研究。确定了火焰能够在细管中稳定传播的当量比极限,以及在不同甲烷百分比下火焰的传播速度。结果表明:在室温条件下,甲烷和氧气预混火焰可以在细管中稳定地停留在一点燃烧,并且可以很好地控制其移动;相反,对于甲烷和空气的预混气体,即便环境温度在1 100K以上,也不能在微细通道中得到稳定的火焰。在同一甲烷流量下存在着两个当量比极限。在这两个当量比之间,火焰可以进入细管传播。在较小气体流量下,当氧气过量时微细通道中甲烷和氧气预混火焰的传播速度与宏观尺度下火焰的传播速度基本相当,随着流量的增加火焰传播速度很明显地增加。Flame propagation in a micro-scale tube was investigated experimentally using methane with oxygen or air mixtures. The studies yielded the range of equivalence ratios for steady flame propagation in the tube with flame propagation speeds investigated for various methane percentages. The results showed two limiting equivalence ratios for the same methane flow rate with the flame propagating in the micro-scale tube for all equivalence ratios between these limits. The premixed methaneroxygen mixtures burned steadily at room temperature, with the flame front controlled by changing the volume flow rate of the premixed gas. The premixed methane-alr mixtures did not burn at room temperature or at more than 1100K. The propagation speed of the lean premixed methane-oxygen flame in the micro-scale tube is close to that in a macro tube, at small volume flow rates. The speed increases dramatically with the flow rates increasing.

关 键 词：燃烧 微细通道 火焰传播速度 甲烷预混火焰 

分 类 号：TK16[动力工程及工程热物理—热能工程]