The present work shows an in-depth analysis about the role of mixing models on the simulation of MILD combustion using a finite-rate combustion model, the Partially Stirred Reactor approach (PaSR). Different approaches of increasing complexity are compared: a simple model based on a fraction of the integral time scale, a fractal-based mixing model and a dynamic mixing model based on the resolution of transport equations for scalar variance and dissipation rate. The approach is validated using detailed experimental data from flames stabilized on the Adelaide Jet-in-Hot Co-flow (JHC) burner at different fuel-jet Reynolds numbers (5k, 10k and 20k) and different co-flow oxygen dilution levels (3%, 6% and 9%). The results indicate the major role of mixing models to correctly handle turbulence/chemistry interactions and clearly indicate the superior performances of the dynamic mixing model over the other tested approaches.

本工作展示了关于混合模型在使用有限速率燃烧模型，部分搅拌反应堆方法（PaSR）的MILD燃烧模拟中的作用的深入分析。比较了增加复杂性的不同方法：一个基于整数时间比例的简单模型，一个基于分形的混合模型以及一个基于输运方程式分辨率的动态混合模型，用于标量方差和耗散率。使用在不同的燃料喷射雷诺数（5k，10k和20k）和不同的并流氧气稀释水平（3）下在阿德莱德热喷共流（JHC）燃烧器上稳定的火焰的详细实验数据验证了该方法的有效性。 ％，6％和9％）。