This work addresses the prediction of the reacting flow field in a swirl stabilized gas turbine model combustor using large-eddy simulation. The modeling of the combustion chemistry is based on laminar premixed flamelets and the effect of turbulence-chemistry interaction is considered by a presumed shape probability density function. The prediction capabilities of the presented combustion model for perfectly premixed and partially premixed conditions are demonstrated. The effect of partial premixing for the prediction of the reacting flow field is assessed by comparison of a perfectly premixed and partially premixed simulation. Even though significant mixture fraction fluctuations are observed, only small impact of the non-perfect premixing is found on the flow field and flame dynamics. Subsequently, the effect of heat loss to the walls is assessed assuming perfectly premixing. The adiabatic baseline case is compared to heat loss simulations with adiabatic and non-adiabatic chemistry tabulation. The results highlight the importance of considering the effect of heat loss on the chemical kinetics for an accurate prediction of the flow features. Both heat loss simulations significantly improve the temperature prediction, but the non-adiabatic chemistry tabulation is required to accurately capture the chemical composition in the reacting layers.

中文翻译：

---

部分预混和热损失对涡稳燃气轮机模型燃烧器反应流场预测的影响

这项工作解决了使用大涡模拟对涡流稳定燃气轮机模型燃烧器中反应流场的预测。燃烧化学建模基于层流预混小火焰，湍流-化学相互作用的影响由假定的形状概率密度函数考虑。展示了所提出的燃烧模型在完美预混和部分预混条件下的预测能力。通过比较完美预混和部分预混模拟来评估部分预混对反应流场预测的影响。尽管观察到显着的混合分数波动，但发现非完美预混对流场和火焰动力学的影响很小。随后，假设完全预混，评估热损失对墙壁的影响。绝热基线情况与具有绝热和非绝热化学列表的热损失模拟进行比较。结果强调了考虑热损失对化学动力学的影响以准确预测流动特征的重要性。两种热损失模拟都显着改善了温度预测，但需要非绝热化学列表才能准确捕获反应层中的化学成分。