针对氨作为零碳燃料在发动机应用中存在的燃烧速度慢、NO_x排放高等问题，开展了氨-氢和氨-甲烷双燃料发动机的燃烧与排放特性模拟研究。基于某12.8 L天然气发动机结构参数，利用GT-POWER软件建立了一维仿真模型（模型验证的核心指标误差小于7%），系统研究了不同转速下，压缩比和掺烧气的体积分数对缸内燃烧压力、排气温度、NOx排放、发动机热效率的影响规律。研究结果表明：提高压缩比和掺烧比均能有效提升缸内峰值压力（p_max）和燃烧速度，但会导致排气温度降低和NO_x排放升高；增加氢气或甲烷比例能显著降低燃料消耗率，提高燃料经济性。

To address the challenges of slow combustion speed and high NO_x emissions associated with ammonia as a zero-carbon fuel in engines, simulation research was conducted on the combustion and emission characteristics of  ammonia-hydrogen and ammonia-methane dual-fuel engines. One-dimensional simulation model （the core index error for model validation of less than 7%) was established using GT-POWER software based on the structural parameters of a 12.8 L natural gas engine. The effects of compression ratio and blending gas volume fraction on in-cylinder peak pressure (p_max), exhaust temperature, NO_x emissions, thermal efficiency were systematically investigated under different engine speeds. The results indicate that increasing both compression ratio and blending ratio can effectively enhance p_max and combustion speed, but would lead to lower exhaust temperature and higher NO_x emissions. Increasing the proportion of hydrogen or methane can significantly reduce fuel consumption rate and improve fuel economy.