为实现燃气轮机的碳中和运行，采用氨氢融合燃烧是兼顾零碳排放与燃烧室高性能的关键技术路径。本研究旨在评估一台6MW燃气轮机燃烧室燃用氨氢混合燃料时的燃烧与排放特性。基于实际燃烧室结构建立了几何模型，采用多面体网格进行划分并对主燃区加密。通过RANS方法与FGM燃烧模型耦合，对0%至40%不同氨裂解比例的工况进行了数值模拟，分析了流场结构、燃烧效率、出口温度均匀性及污染物排放等关键性能参数。结果表明:氨裂解比例显著影响燃烧性能，当比例为20%~25%时，燃烧效率超过99%，未燃氨排放低于350 ppm，NO排放约376 ppm，且出口温度分布均匀性最佳（OTDF最低为0.216），总压损失保持稳定。系统性评估了氨裂解比例对工业级燃烧室性能的影响，并验证了FGM方法在氨氢燃烧模拟中的适用性。研究表明，合适的氨裂解比例可有效促进氨的清洁高效燃烧，为该类燃料在燃气轮机中的应用提供了重要依据。

To achieve carbon-neutral operation of gas turbines, adopting ammonia-hydrogen co-firing is a critical technological pathway that balances zero carbon emissions with high combustion chamber performance. This study aims to evaluate the combustion and emission characteristics of a 6MW gas turbine combustion chamber fueled with ammonia-hydrogen blended fuel. A geometric model was established based on the actual combustion chamber structure, utilizing polyhedral mesh division with refinement in the primary combustion zone. By coupling the RANS method with the FGM combustion model, numerical simulations were conducted for conditions with 0% to 40% ammonia cracking ratios. Key performance parameters, including flow field structure, combustion efficiency, outlet temperature uniformity, and pollutant emissions, were analyzed. The results indicate that the ammonia cracking ratio significantly affects combustion performance. At a ratio of 20%–25%, combustion efficiency exceeds 99%, unburned ammonia emissions remain below 350 ppm, NO emissions are approximately 376 ppm, and the outlet temperature distribution achieves optimal uniformity (lowest OTDF of 0.216), while the total pressure loss remains stable. This study systematically evaluates the impact of ammonia cracking ratio on the performance of an industrial-scale combustion chamber and validates the applicability of the FGM method for ammonia-hydrogen combustion simulation. Studies have shown that an appropriate ammonia cracking ratio can effectively promote clean and efficient ammonia combustion, providing an important basis for the application of this fuel in gas turbines.