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首页> 外文期刊>Combustion Science and Technology >A Numerical Investigation of Turbulent Premixed Methane-Air Combustion in a Cylindrical Chamber
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A Numerical Investigation of Turbulent Premixed Methane-Air Combustion in a Cylindrical Chamber

机译：圆柱室中甲烷-空气湍流混合燃烧的数值研究

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Turbulent premixed methane-air combustion in an axisymmetric cylindrical chamber is numerically simulated by a second-order finite volume method. Combustion chemistry is modeled by a reduced mechanism consists of 16 species and 31 elementary reactions, which includes some C1 and C2-chain species. Reaction rates are considered as minimum rates between Arrhenius rates and eddy break-up rates. Turbulent modeling is done via standard k-ε model with modified coefficients in flame cases and empirical inlet boundary conditions. All the numerical results were compared with experimental data for 3 turbulent premixed methane-air flames. Since combustion is occurred in distributed reaction zone, the turbulent intensities play an important role in prediction of the flame characteristics such as temperature and species mass fractions, specially when the flame occurs near the broken reaction zone. The results show the important role of C2-chain species in prediction of turbulent premixed flames behavior, especially in CO and O_2 mass fractions and the temperature field.
机译：通过二阶有限体积法对轴对称圆柱室内的湍流预混合甲烷-空气燃烧进行了数值模拟。燃烧化学的模型化简为16种物质和31种基本反应，其中包括一些C1和C2链物质。反应速率被认为是阿累尼乌斯速率和涡流分解速率之间的最小速率。湍流建模是通过标准的k-ε模型完成的，在火焰情况和经验入口边界条件下，系数已修改。将所有数值结果与3种湍流的甲烷-空气预混火焰的实验数据进行了比较。由于燃烧发生在分布的反应区中，因此湍流强度在预测火焰特征（例如温度和物质质量分数）中起着重要作用，特别是当火焰发生在破裂的反应区附近时。结果表明，C2链物种在预测湍流预混火焰行为中具有重要作用，尤其是在CO和O_2的质量分数和温度场中。

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