Combustion characteristics of methane/air in a micro-combustor with a regular triangular pyramid bluff body were numerically investigated. Results reveal that the blow-off limit of the micro-combustor with a regular triangular pyramid bluff body is 2.4 times of that in the micro-combustor without bluff body. With the increase of inlet velocity, the recirculation zone expands and preferential transport effect behind the bluff body is intensified. Therefore, the local equivalence ratio in the recirculation zone increases when Φ = 0.8, but the growth trend of local equivalence ratio is not obvious when the inlet velocity exceeds 10 m/s. When Φ < 1.0, adding small amount of hydrogen into gas mixture can speed up the significant elementary reaction, leading to an increase of methane conversion. It's found that both the methane conversion rate and the temperature behind the bluff body reaches the highest when blockage ratio increase to 0.22.

数值研究了具有规则的三角锥状钝体的微型燃烧器中甲烷/空气的燃烧特性。结果表明，具有规则三角形金字塔钝形体的微型燃烧器的吹扫极限是没有钝形体的微型燃烧器的吹扫极限的2.4倍。随着入口速度的增加，再循环区域扩大，钝体后面的优先运输作用增强。因此，当Φ= 0.8时，再循环区的局部当量比增加，但是当入口速度超过10 m / s时，局部当量比的增长趋势并不明显。当Φ<1.0时，向气体混合物中添加少量氢气可以加快显着的元素反应，从而提高甲烷转化率。它'