微细通道中甲烷预混火焰传播的实验

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。

Methane premixed flame propagation in a micro-scale tube

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 methane-oxygen mixtures burned steadily at room temperature,with the flame front controlled by changing the volume flow rate of the premixed gas.The premixed methane-air mixtures did not burn at room temperature or at more than(1 100 K. 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.