Hydrogen/methane buoyant fires with various hydrogen volume fractions ranging from 0% to 20% were numerically studied in this paper. The modified eddy dissipation concept combustion model for multi-fuels in the large eddy simulation (LES) framework was employed for combustion, and especially the infinitely fast rate based on “global” concept was improved. Combined with the weighted sum of gray gas model for emission/absorption coefficient, the finite volume discrete ordinates model was used to compute the radiative heat transfer. The predicted centerline temperature, velocity, and flame height are in good consistence with the measured data. Furthermore, the detailed analysis was conducted on the dependency of the parameters such as centerline temperature and velocity, flame height, and soot volume fraction on hydrogen volume concentration.

本文数值研究了氢体积分数为0％至20％的氢气/甲烷浮力火灾。在大涡模拟（LES）框架下，采用改进的多燃料涡流概念燃烧模型进行燃烧，特别是改进了基于“全局”概念的无限快率。结合灰气体模型的权重之和作为发射/吸收系数，利用有限体积离散纵坐标模型来计算辐射传热。预测的中心线温度，速度和火焰高度与测量数据高度一致。此外，根据中心线温度和速度，火焰高度和烟灰体积分数等参数对氢气体积浓度的依赖性进行了详细分析。