Moderate or intense low-oxygen dilution (MILD) combustion is a novel combustion technology with the comparable chemical and turbulent mixing timescales. In the most of literatures, relatively expensive volume-based models are recommended for this combustion regime while this regime is not completely idealized homogenized reactor and nor strong flamelet like. This paper is focused on the assessment of the lower cost, flamelet approach for MILD condition. In this way, simplifying JHC burner of Dally et al. is considered to model using RANS approach. The effects of inclusion of unity versus non-unity Lewis numbers, radiation heat transfer, and various scalar dissipation rates are evaluated. Results show that the flamelet model may not be totally rejected for the MILD condition because it could still capture flame characteristics relatively acceptable. Choosing an appropriate scalar dissipation rate value is discussed for single flamelet and higher values are recommended by O₂ increment. Moreover, considering non-unity Lewis numbers improved species concentration at the jet centerline for low O₂ levels. Furthermore, the unsteady flamelet model with radiation had a better prediction for NO_x especially for higher O₂ Levels.

中度或强烈的低氧稀释（MILD）燃烧是一种新颖的燃烧技术，具有可比的化学和湍流混合时间尺度。在大多数文献中，对于该燃烧方案，建议使用相对昂贵的基于体积的模型，而该方案不是完全理想化的均质化反应堆，也不是强火焰状的。本文着重于评估轻度，轻度方法用于轻度条件的评估。这样，简化了Dally等人的JHC燃烧器。被认为是使用RANS方法建模的。评估了包含统一与非统一刘易斯数，辐射热传递和各种标量耗散率的影响。结果表明，小火焰模型不能完全排除在轻度条件下，因为它仍然可以捕获相对可接受的火焰特征。_2个增量。此外，考虑到非统一的Lewis数，对于低O ₂含量，改善了射流中心线的物种浓度。此外，用辐射不稳定火焰面模型具有用于NO更好的预测_X特别是对于更高的直径：₂水平的影响。