在可视化微尺度燃烧实验台上进行甲烷和氧气的燃烧试验,利用高速数码照相机捕捉到了火焰面在微通道内的传播过程,测试分析了不同进气流量下反复熄燃火焰的可燃极限、火焰传播速度和火焰间隔时间,获得了反复熄燃火焰(flames with repetitive extinction and ignition,FREI)的燃烧特性。结果表明:随着甲烷进气流速的增加,可以形成FREI火焰的氧气进气流速范围也在扩大;在甲烷进气流速一定的情况下,随着氧气进气流速的增加,火焰的传播速度也逐渐增加,并且火焰重复点燃的间隔时间呈现先变大后逐渐变小的规律,即火焰重复点燃的频率先变慢后又逐渐变快直至火焰熄灭。 Methane and oxygen combustion experiments were carried out on a visual microscale combustion experiment platform. The propagation of the flame surface in the microchannels was captured by a high-speed digital camera. The flammability limits of the flameout flames were measured and analyzed under different inlet flow rates. The flame propagation Speed ​​and flame interval, the combustion characteristics of flames with repetitive extinction and ignition (FREI) were obtained. The results show that with the increase of methane inlet velocity, the range of oxygen inlet velocity that can form FREI flame is also expanding. With the constant inlet velocity of methane, the velocity of flame propagation increases with the increase of oxygen inlet velocity Gradually increased, and the flame repetition time showed the first to become larger and then become smaller and smaller, that is, the frequency of repeated flame ignition slows down and then gradually becomes faster until the flame goes out.