Based on the fact that NOx generation will be inhibited under the condition of high equivalence ratio, the micro-combustors with double-rib structure partially inserted with porous medium (PM) are selected to examine the NOx emission performances in fuel-rich combustion of ammonia. The effects of: 1) the inlet velocity, 2) the porous material and 3) the porosity are evaluated on NOx emission reduction. Besides, the kinetic rate of key reactions contributing NOx production are analyzed. It is found that, the PM can effectively reduce NO generation and emission under a larger inlet velocity. With the increased thermal conductivity of porous material, the emission of NO is shown to be decreased by 99.98% from 2.70 × 10⁴ ppm to 5.17 ppm, while N₂O emission is increased by 10000% from 24.8 ppm to 2.52 × 10³ ppm. In addition, the porous material with a higher thermal conductivity is beneficial to improving the uniformity of the combustor outer wall temperature. When the PM’s porosity is increased from 0.5 to 0.9, NO emission is increased by 4120% from 3.53 × 10² ppm to 1.49 × 10⁴ ppm, while N₂O emission is decreased by 71.5% from 3.29 × 10³ ppm to 9.38 × 10² ppm. The present work reveals that the NOx emission can be effectively reduced, while increasing the thermal performance of micro-combustors by adopting appropriate porous medium.

基于在高当量比条件下抑制NOx生成的事实，选择了部分插入多孔介质（PM）的双肋结构微燃烧器，考察了氨富燃料燃烧时的NOx排放性能。 . 1) 入口速度、2) 多孔材料和 3) 孔隙率对 NOx 排放减少的影响进行了评估。此外，分析了促成 NOx 产生的关键反应的动力学速率。研究发现，在较大的进气速度下，PM可以有效地减少NO的产生和排放。随着多孔材料热导率的提高，NO 的排放量从 2.70 × 10 ⁴ ppm 降低到 5.17 ppm，减少了 99.98%，而 N ₂O 排放量从 24.8 ppm 增加到 2.52 × 10 ³ ppm，增加了 10000%。此外，具有较高热导率的多孔材料有利于提高燃烧器外壁温度的均匀性。当 PM 的孔隙率从 0.5 增加到 0.9 时，NO 排放量从 3.53 × 10 ² ppm 增加到 1.49 × 10 ⁴ ppm 增加了 4120%，而 N _{2 O 排放量从 3.29 × 10} ³ ppm减少了 71.5%到 9.38 × 10 ² ppm。目前的工作表明，通过采用适当的多孔介质，可以有效减少 NOx 排放，同时提高微型燃烧器的热性能。