针对以天然气为燃料的燃气轮机使用掺氢燃料后的燃烧及其排放特性开展研究，基于DLN1.0燃烧室火焰筒，采用数值模拟的方法研究不同掺氢比（H₂体积分数0 ~ 30%一共7种工况）在恒定热功率和相同当量比条件下对天然气混合气燃烧过程的影响，获得火焰筒内流场、温度场和燃烧产物的分布参数以及对应关系。结果表明：随着掺氢比的增加火焰温度上升，燃烧反应区扩大，火焰筒出口处的温度分布均匀性变差；掺氢造成局部释热量的改变，会导致NO_x的排放随着掺氢比的增加而呈现增加趋势；CO和CO₂的排放量都有显著的减少，H₂O的生成量显著增加。同时，采用所提出稀释燃烧的方法解决由掺氢造成的一系列问题，研究不同当量比工况下掺氢燃烧后的特性变化，并计算得到各个掺氢比工况下最佳的当量比值。研究成果为后续工业燃气轮机天然气掺氢燃烧技术的应用提供了理论指导。

The combustion and emission characteristics of existing gas turbines using hydrogen-doped fuel were studied. Based on the DLN1.0 combustion chamber flame cylinder, the numerical simulation method was adopted to study the influence of different hydrogen-doped ratios (a total of 7 operating conditions with volume fraction of H₂ ranging from 0 to 30%) on the combustion process of natural gas mixture under the condition of constant thermal power and the same equivalent ratio. The distribution parameters of the flow field, temperature field and combustion product in a flame cylinder and their corresponding relationships were obtained. The results show that with the increase of hydrogen mixing ratio, the flame temperature rises, the combustion reaction zone expands, and the temperature distribution uniformity at the outlet of the flame tube becomes worse. Hydrogen mixing results in the change of local heat release, which will lead to an increasing trend of NO_x emission with the increase of the hydrogen mixing ratio. Both CO and CO₂ emissions decrease significantly, while H₂O production increases significantly. At the same time, a proposed dilution combustion method was adopted to solve a series of problems caused by hydrogen mixing, the characteristics changes were studied after hydrogen mixing combustion under different equivalent ratios, and the best equivalent ratio was calculated under each hydrogen mixing ratio. The research results provide theoretical guidance for the subsequent application of hydrogen-doped combustion technology in industrial gas turbines.