Data for publication: Hydrogen Jet Flame Control by Global Mode

Research data related to the publication "Hydrogen Jet Flame Control by Global Mode". In this study, we employ the potential of the global instability phenomenon to qualitatively alter the dynamics of a turbulent flame. We adopt the large eddy simulation method and an in-house numerical code. For the combustion process we do not include explicit sub-filter modeling. The accuracy of this ‘no combustion model’ approach is verified by comparison against the Eulerian Stochastic Fields method. We include several test cases representing different flow regimes, including convective and absolutely unstable conditions. The focus is on a counter-current configuration, which includes a central jet nozzle supplying hydrogen fuel surrounded by a somewhat larger co-axial nozzle sucking fluid from the surroundings of the central nozzle. The suction generates a counterflow where global instability is found to be triggered if sufficiently strong suction is applied. The critical suction value IGI is larger if the level of the inlet turbulence intensity Ti is increased. Depending on the suction strength, the flame quickly stabilizes, either as being attached to the nozzle or as a lifted flame hovering at a height of a few fuel nozzle diameters. Additionally, it is shown that increasing Ti can assist an initially lifted flame to attach to the nozzle. Flame lifting is the result of self-induced strong toroidal vortices that lead to leaner combustion conditions of the mixture upstream of the flame base. The toroidal vortices prevent upstream flame propagation and lead to a very intense mixing process that gives rise to the lifted reaction zone. This ensures almost complete fuel combustion at a short distance from the inlet.The research was supported by the National Science Center in Poland (Grant No 2020/39/B/ST8/02802) and the National Agency for Academic Exchange (NAWA) within the International Academic Partnerships Programme (ANIMATE project No. PPI/APM/2019/1/00062).The readme file contains sorted filenames linked to the figures from the article.For details on file formats please refer to the readme file and documentation: https://www.tecplot.com/2016/09/16/tecplot-data-file-types-dat-plt-szplt/

与论文《基于全局模态的氢射流火焰控制》相关的研究数据。本研究利用全局不稳定性现象的潜力，定性改变湍流火焰的动力学特性。我们采用大涡模拟（large eddy simulation）方法和自主研发的数值代码。对于燃烧过程，我们未纳入显式亚网格模型。这种‘无燃烧模型’方法的准确性通过与欧拉随机场（Eulerian Stochastic Fields）方法对比得到验证。我们包含多个代表不同流态的测试案例，包括对流不稳定和绝对不稳定条件。研究重点为逆流构型，该构型包含一个供应氢燃料的中心射流喷嘴，其外围环绕着一个稍大的同轴喷嘴，用于从中心喷嘴周围环境中抽吸流体。抽吸作用产生逆流，当施加足够强的抽吸时，会触发全局不稳定性。当入口湍流强度Ti增大时，临界抽吸值IGI会变大。根据抽吸强度的不同，火焰会迅速稳定，要么附着于喷嘴，要么成为悬浮在燃料喷嘴直径数倍高度处的浮升火焰。此外，研究表明增大Ti可帮助初始浮升火焰附着于喷嘴。火焰浮升是自诱导强环形涡旋的结果，该涡旋导致火焰基底部上游混合物的燃烧条件变贫。环形涡旋阻止火焰向上游传播，并引发强烈的混合过程，从而形成浮升反应区。这确保燃料在距离入口较近的位置几乎完全燃烧。本研究得到波兰国家科学中心（资助编号：2020/39/B/ST8/02802）以及波兰国家学术交流局（NAWA）国际学术合作计划（ANIMATE项目编号：PPI/APM/2019/1/00062）的支持。readme文件包含与论文图表关联的排序文件名。有关文件格式的详细信息，请参考readme文件和文档：https://www.tecplot.com/2016/09/16/tecplot-data-file-types-dat-plt-szplt/