Flame stabilisation and structure in axially staged combustion

我们的目标是提高对燃气轮机所采用的轴向分级燃烧相关条件下火焰稳定和结构的基本理解，在这种情况下，最初的超稀薄预混阶段之后是在较高当量比下的较短停留时间阶段。这一概念实现了更高的涡轮机入口温度，从而提高了效率，同时限制了氮氧化物的排放，更重要的是，在关闭和燃烧具有不同反应性的燃料(如氢气)时，能够提高操作灵活性。这个项目将应用大规模的直接数值模拟来促进对这种不寻常的燃烧模式的基本理解，并开发能够预测其行为的实用模型。

We aim to improve fundamental understanding of flame stabilisation and structure in conditions relevant to axially staged combustion employed in gas turbines, in which an initial ultra-lean premixed stage is followed by a short residence time stage at higher equivalence ratios. This concept enables high turbine entry temperatures and thus high efficiency while limiting emissions of nitrogen oxides, and, importantly, enables improved operational flexibility in turndown and in burning fuels with different reactivities, such as hydrogen. This project will apply large-scale direct numerical simulations to advance fundamental understanding of this unusual combustion mode, and develop practical models able to predict its behaviour.