To achieve comprehensive prediction of ammonia combustion in terms of flame speed and ignition delay time, an improved mechanism of ammonia oxidation was proposed in this work. The present model (UT-LCS) was based on a previous work [Song et al., 2016] and improved by relevant elementary reactions including NH₂, HNO, and N₂H₂. The model clearly explained reported values of laminar flame speed and ignition delay time in wide ranges of equivalence ratio and pressure. This suggests that NH₂, HNO, and N₂H₂ reactivities play a key role to improve the reaction mechanism of ammonia oxidation in the present model. The model was also applied to demonstrate NH₃/H₂/air combustion. The present model also appropriately predicted the laminar flame speed of NH₃/H₂/air combustion as a function of equivalence ratio. Using the model, we discussed the reduction of NO concentration downstream and H₂ formation via NH₃ decomposition in NH₃/H₂ fuel-rich combustion. The results provide suggestions for effective combustion of NH₃ for future applications.

为了从火焰速度和点火延迟时间的角度对氨燃烧进行综合预测，提出了一种改进的氨氧化机理。本模型（UT-LCS）基于先前的工作[Song等，2016]，并通过相关的基本反应（包括NH ₂，HNO和N ₂ H _{2）进行了改进}。该模型清楚地解释了当量比值和压力范围内的层流火焰速度和点火延迟时间的报告值。这表明在本模型中，NH ₂，HNO和N ₂ H _2的反应性对于改善氨氧化的反应机理起着关键作用。该模型还用于演示NH ₃ / H₂ /空气燃烧。本模型还适当地预测了NH ₃ / H ₂ /空气燃烧的层流火焰速度作为当量比的函数。利用该模型，我们讨论了NO浓度下游和H的还原₂经由形成NH ₃在NH分解₃ / H ₂的富燃料燃烧。该结果为NH _3的有效燃烧提供了建议，以备将来应用。