Subgrid-scale (SGS) parameterization and method for calculating filtered reaction rate are critical components of an accurate large-eddy simulation (LES) of turbulent flames. In this study, we integrate gradient-type structural SGS models with a partially stirred reactor approach by using detailed chemical kinetics to simulate a turbulent methane/hydrogen jet flame under moderate or intense low-oxygen dilution (MILD) conditions. The study examines two oxygen dilution levels. The framework is assessed through a systematic and comprehensive comparison of temperature, and mass fractions of major and minor species with experimental data and other reference simulation results. Overall, the statistics of the combustion field show excellent agreement with measurements at different axial locations, and a significant improvement compared to some previous simulations. It suggests that the proposed nonlinear LES framework is able to accurately model MILD combustion with reasonable computational cost.

亚网格规模（SGS）参数化和计算过滤后反应速率的方法是湍流火焰精确大涡模拟（LES）的关键组成部分。在这项研究中，我们通过使用详细的化学动力学模拟在中等或强烈的低氧稀释（MILD）条件下的湍流甲烷/氢气射流火焰，将梯度型结构SGS模型与部分搅拌的反应器方法集成在一起。该研究检查了两个氧气稀释水平。通过对温度，主要物种和次要物种的质量分数以及实验数据和其他参考模拟结果进行系统，全面的比较，对框架进行评估。总体而言，燃烧场的统计数据与不同轴向位置的测量结果非常吻合，与以前的一些模拟相比，有了很大的改进。这表明所提出的非线性LES框架能够以合理的计算成本准确地模拟MILD燃烧。