Development of Unified Flame Surface Density Based Reaction Rate Models for the LES of Turbulent Premixed Flames

我们的目标是开发一个有效的火焰表面密度（FSD）为基础的反应速率关闭大涡模拟湍流预混火焰（LES）。尽管FSD闭包在Reynolds average Navier Stokes （RANS）模拟中得到了很好的应用，但在LES模拟中却相对罕见，目前还没有对其性能的详细评估。在该项目中，将开发基于消防处的反应速率闭包，并同时通过对明确过滤的直接数值模拟（DNS）数据的先验分析和对实际LES结果中模型性能的后验评估进行评估，并提供实验数据。在同时进行先验和后验分析的基础上，将开发新的统一模型，然后通过对现有模型进行的相同分析来评估其性能。然后，模型实现将以这样一种格式进行一般化，即它们可以用作涉及复杂几何配置的任何商业或内部通用代码的附加组件。将在其中执行的新子程序将免费提供给感兴趣的国家和国际同事。基于fsd的高效反应速率关闭将为在预混模式下燃烧的可靠、更清洁、更具成本效益的燃烧装置（例如火花点火发动机、精益预混预汽化（LPP）和工业燃气轮机燃烧器）提供可靠的CFD设计工具。

We aim to develop an efficient Flame Surface Density (FSD) based reaction rate closure for the Large Eddy Simulation (LES) of turbulent premixed flames. Although FSD closures are well established for Reynolds Averaged Navier Stokes (RANS) simulations, they are relatively rare for LES, and no detailed evaluation of their performance is available so far. In this project, FSD based reaction rate closures will be developed and simultaneously assessed by a-priori analyses of explicitly filtered Direct Numerical Simulation (DNS) data, and a-posteriori evaluations of model performances in actual LES results, in a configuration for which experimental data is available. Based on the simultaneous a-priori and a-posteriori analyses, new unified models will be developed and their performance will then be assessed by the same analysis as carried out for the existing models. The model implementation will then be generalised in such a format that they can be used as an add-on to any commercial or inhouse general purpose code involving complex geometrical configurations. The new subroutines where this will be implemented will be made freely available to interested national and international colleagues. An efficient FSD-based reaction rate closure will provide a reliable CFD based design tool for reliable, cleaner and cost-effective combustion devices where combustion takes place in premixed mode (e.g. Spark Ignition engines, Lean Premixed Pre-vaporised (LPP) and industrial gas turbine combustors.)