【摘要】 依托反应路径分析法研究NO_x（NO、NO₂、N₂O）的生成和消耗，并构建NO_x化学动力学机理。将NO_x机理与NH₃/H₂燃烧机理组合，利用元素标记法研究NH₃/H₂燃烧的燃料型N^*O_x和空气型NO_x生成特性。结果表明，组合机理能在较宽的当量比范围内准确预测点火延迟时间、层流燃烧速度及重要组分浓度。添加50%的H₂不会对NH₃的氧化路径产生显著影响，但H₂的加入可促进O、H、OH自由基大量生成，进一步促进NH₃的氧化，这也是导致燃料型N^*O、N^*O₂，及空气型NO、NO₂、N₂O生成量显著增加的主要原因。由H₂参与燃烧生成的H自由基会促进燃料型N^*₂O、燃料/空气混合型NN^*O的转化，从而降低此二者的最终生成量。此外，燃料型N^*O、N^*O₂、N^*₂O在纯NH₃燃烧或50%掺H₂比的NH₃/H₂混合燃料燃烧所生成的NO、NO₂、N₂O中占主要地位。更多还原

【Abstract】 Based on the reaction path analysis method, the generation and consumption of NO_x（NO, NO₂, N₂O） and the NO_x chemical kinetic mechanism were studied. The NO_x mechanism was combined with the NH₃/H₂ combustion mechanism, and the fuel-type N^*O_x and air-type NO_x generation characteristics of NH₃/H₂ combustion were investigated using the elemental labelling method. The results show that the combined mechanism can accurately predict the ignition delay time, laminar burning velocity, and the concentration of important components in a wide range of equivalence ratios. Adding 50% H₂ does not significantly affect the oxidation pathway of NH₃. The addition of H₂ promotes the generation of large amounts of O, H, and OH radicals, which further promotes the oxidation of NH₃ and is the main reason for the significant increase in the generation of fuel-type N^*O and N^*O₂, as well as air-type NO, NO₂, and N₂O. The H radicals generated by H₂ combustion promote the conversion of fuel-type N^*₂O and fuel/air-type NN^*O, thus reducing the final production of both. In addition, fuel-type N^*O, N^*O₂, and N^*₂O dominate the NO, NO₂, and N₂O produced by pure NH₃ combustion or NH₃/H₂ combustion with a 50% H₂ ratio.更多还原