The effects of Exhaust Gas Recirculation (EGR) through the dilution by carbon dioxide and water vapour on methane flames/oxygen-enriched air in the case of the pressurized premixed combustion encountered in gas turbines are studied. The chosen configuration is a confined swirled premixed flame with a constant swirl number (Sn = 0.90). The input parameters are the initial temperature, adiabatic flame temperature, pressure (0.1 MPa), and the flow rates and concentrations of CH₄, O₂, CO₂, H₂O and N₂. The pollutant emissions of NO and CO were measured at the exit of the combustion chamber and expressed as a volume fraction on dry gas. The gaseous emissions of NOx, CO, CO₂ and O₂ were measured by a HORIBA PG250 analyser, and in the case of high CO₂ dilutions, the CO₂ concentration measurements were made using a HORIBA VA-3000 analyser. The pollutant emissions were measured for the two initial temperatures T₀ = 373 and 473 K and for the four adiabatic temperatures (1773, 1873, 1973 and 2073 K). Finally, the role of parameters (enrichment, diluent, equivalence ratio) likely to play a part in the production of CO and NO pollutant emissions was analyzed. The influence of the diluent on the emissions is highlighted. Dilution with CO₂ decreases NO emissions but leads to an increase in CO. Dilution with water vapour is more attractive since at a constant adiabatic temperature, it leads to lower emissions of CO₂, CO and NO.

研究了在燃气轮机中遇到加压预混燃烧的情况下，通过二氧化碳和水蒸气的稀释，废气再循环 (EGR) 对甲烷火焰/富氧空气的影响。所选配置是具有恒定涡流数 (Sn = 0.90) 的受限涡流预混火焰。输入参数是初始温度、绝热火焰温度、压力（0.1 MPa）以及 CH ₄、O ₂、CO ₂、H ₂ O 和 N ₂的流速和浓度。在燃烧室出口处测量 NO 和 CO 的污染物排放量，并表示为干气的体积分数。NOx、CO、CO ₂和 O的气体排放₂是通过 HORIBA PG250 分析仪测量的，并且在高 CO ₂稀释的情况下，使用 HORIBA VA-3000 分析仪进行CO ₂浓度测量。污染物排放是针对两个初始温度 T ₀  = 373 和 473 K 以及四个绝热温度（1773、1873、1973 和 2073 K）测量的。最后，分析了可能在 CO 和 NO 污染物排放产生中起作用的参数（富集、稀释剂、当量比）的作用。稀释剂对排放的影响被突出显示。用 CO ₂稀释减少 NO 排放，但导致 CO 增加。用水蒸气稀释更具吸引力，因为在恒定的绝热温度下，它会导致 CO ₂、CO 和 NO 的排放降低。