基于DRGEPSA方法的甲烷燃烧简化机理的构建及验证

Construction and Validation of A Simplified Mechanism for Methane Combustion Based on DRGEPSA Method

采用耦合误差传播和敏感性分析的直接关系图(DRGEPSA)法,对甲烷燃烧详细反应机理(Gri Mech 3.0机理)进行了简化,构建出了一套含有23种组分和110步基元反应的简化机理。为验证该简化机理的合理性和可靠性,采用充分搅拌反应器模型和一维层流预混反应器模型分别对甲烷燃烧反应过程进行模拟,并对温度和组分摩尔分数分布进行了对比分析。结果显示:利用简化机理分析得到的预测数据与详细机理吻合良好。结合该简化机理,建立了二维数值模型对带伴流的甲烷/空气Flame D进行数值模拟仿真研究,流场的温度和组分分布均与实验值吻合度较好,进一步表明所提甲烷燃烧简化机理具有较高的模拟精度。

Direct Relation Graph with Error Propagation and Sensitivity Analysis(DRGEPSA)method coupled with error propagation and sensitivity analysis was used to simplify the detailed reaction mechanism of methane combustion(Gri Mech 3.0 mechanism),and a simplified mechanism containing 23 components and 110 step elementary reactions was constructed.In order to verify the rationality and reliability of the simplified mechanism,the fully stirred reactor model and one-dimensional laminar premixed reactor model were used to simulate the combustion reaction process of methane,and the temperature and mole fraction distribution of components were compared and analyzed.The results show that the combustion temperature and component volume fraction obtained by the simplified mechanism analysis are in good agreement with the detailed mechanism prediction data.Combined with the simplified chemical reaction mechanism,a two-dimensional numerical model is established to verify the numerical simulation of methane/air diffusion combustion(Flame D)with accompanying flow.The temperature and component distribution of the flow field are in good agreement with the experimental data,which further shows that the simplified mechanism of methane combustion obtained in this paper has high simulation accuracy and is suitable for numerical simulation of methane combustion.