Flame Dynamics Modelling Using Artificially Thickened Models

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2023-06-13 DOI:10.1007/s10494-023-00433-2

Omer Rathore, Salvador Navarro-Martinez

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引用次数: 0

Abstract

Thickened flame models are prolific in the literature and offer an effective method of resolving flame dynamics on coarse LES meshes. The current state of the art relies heavily on the use of efficiency functions to compensate for impaired wrinkling of the thickened flame. However in practice these functions can involve parameters that are difficult to determine, perform poorly outside of certain ranges or require a posteriori analysis to evaluate performance. An alternative based on a generalised thickening is evaluated across a range of canonical configurations. The approach is demonstrated to perform well across a large range of thickening factors in capturing phenomena such as localised quenching and pinch off as well as generation of flame surface. Including good performance even in the case of large flame dynamics under acoustic forcing where the model has a clear advantage over DNS in achieving grid independence. Finally the approach is unified into an Large Eddy Simulation/Adaptive Mesh Refinement framework and applied to a turbulent Bunsen flame. The results show that even if the internal flame structure is poorly resolved on the original mesh, the global system behaviour is well predicted and compares favourably with other approaches.

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使用人工加厚模型的火焰动力学建模

加厚火焰模型在文献中大量出现，并提供了一种在粗LES网格上求解火焰动力学的有效方法。目前的技术状况在很大程度上依赖于使用效率函数来补偿增厚火焰的受损褶皱。然而，在实践中，这些函数可能涉及难以确定的参数，在某些范围之外表现不佳或需要后验分析来评估性能。基于广义增厚的替代方案在一系列规范配置中进行评估。该方法被证明在捕获局部淬火和掐断以及火焰表面产生等现象时，在大范围的增厚因素中表现良好。即使在声学强迫下的大火焰动力学情况下，该模型在实现网格独立性方面比DNS具有明显的优势，也具有良好的性能。最后，将该方法统一到一个大涡模拟/自适应网格细化框架中，并应用于湍流本生灯火焰。结果表明，即使内部火焰结构在原始网格上的分辨率较差，也可以很好地预测系统的整体行为，并且与其他方法相比具有优势。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.