中文摘要：

以零维均质甲烷/空气/NOx预混气体为研究对象,通过数值模拟研究了其在不同初始温度以及不同NOx初始浓度下的着火过程,并借助于敏感性分析和化学反应路径分析揭示了NO和NO2促进甲烷/空气着火的化学反应动力学机理.研究结果表明,在不添加NO和NO2时,甲基CH3氧化速度缓慢,从而导致甲烷/空气不易着火;在添加NO或NO2后,甲基CH3可以迅速被氧化,从而促进了甲烷/空气的着火.添加NO或者NO2相当于给CH3氧化过程提供了催化剂.

英文摘要：

Homogeneous ignition of methane/air/NOx mixtures was investigated numerically.Simulations of ignition processes at different initial temperatures and NOx concentrations were conducted.The chemical mechanism for the ignition enhancement of methane/air due to NO and NO2 was revealed via sensitivity analysis and reaction-path analysis.It was found that the oxidization of CH3 is relatively slow without the addition of NOx,which results in the slow ignition of methane/air.However,CH3 can be quickly oxidized when NO or NO2 is added.It was demonstrated that NO or NO2 works as the catalyst for the oxidization of CH3.