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为了阐明重型燃气轮机燃烧过程的反应动力学特性,采用Gri_3.0,NUI_Galway与USC_2.0动力学模型对甲烷燃料在定容燃烧反应器中的燃烧特性进行了数值计算,并与实验结果进行了对比分析,确定了甲烷燃料的反应动力学模型;耦合该反应动力学模型与CFD计算软件,对燃用甲烷燃料的重型燃气轮机燃烧室单个火焰筒的燃烧过程进行了反应动力学分析,并与相应实验结果进行了对比分析。结果表明:与NUI_Galway及USC_2.0动力学模型相比,采用Gri_3.0动力学模型计算得到的甲烷燃料多工况下的燃烧特性与实验值吻合较好;在该重型燃气轮机燃烧室单个火焰筒中,在火焰筒头部与主燃区同时存在两个明显的呈对称状态的回流区;在该火焰筒中的高温区域,O,OH与H等活性组分以及CO2的摩尔分数达到最大,而在低温区域CO的摩尔分数达到最大;同时,与实验值相比,采用Gri_3.0动力学模型计算得到的单个火焰筒的出口平均温度略高约4K,热点温度高约197K。
In order to clarify the reaction kinetic characteristics of heavy gas turbine combustion, the combustion characteristics of methane fuel in a constant volume combustion reactor were numerically calculated by Gri_3.0, NUI_Galway and USC_2.0 kinetics models and compared with the experimental results The reaction kinetic model of methane fuel was determined and analyzed. Coupling the reaction kinetics model and CFD calculation software, the reaction kinetics of combustion process of a single flame tube of a heavy gas turbine combustor with methane fuel was analyzed and compared with the corresponding experiment The results of a comparative analysis. The results show that, compared with the NUI_Galway and USC_2.0 kinetic models, the combustion characteristics of the methane fuel calculated by the Gri_3.0 dynamic model are in good agreement with the experimental values. In the single flame tube of the heavy gas turbine combustor, , There are two obvious symmetrical reflux zones in the head of the flame tube and the main combustion zone. In the high temperature zone of the flame tube, the molar fractions of O, OH and H and other active components and CO2 reach the maximum, At the same time, compared with the experimental data, the average outlet temperature of a single flame tube calculated by Gri_3.0 kinetic model is about 4 K higher and the hot spot temperature is about 197K higher.