Exploratory Study of the Impact of the Turbulence Model on Flame Extinction with an EDM and EDC/Finite-Rate Approach for a Line Burner Configuration

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2023-10-21 DOI:10.1007/s10494-023-00498-z

Jeri At Thabari, Georgios Maragkos, Bart Merci

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Abstract

The paper presents large eddy simulations of a turbulent line burner and studies the influence of turbulence modelling, for various levels of flame extinction. The classical Smagorinsky model, as well as a static and dynamic version of a one-equation model are applied to model sub-grid scale turbulence. Within this context, two different combustion models are considered: the eddy dissipation model (EDM) with infinitely fast chemistry and the eddy dissipation concept (EDC) with simplified finite-rate chemistry. The model assessment is made through comparison to experimental data by considering both first and second order statistics. For the cases without extinction, the results indicate that the use of the dynamic one-equation turbulence model performs poorly with either of the combustion models. The analysis suggests that the dynamically determined turbulence model parameters have a significant effect in the mixing time scales and the resulting reaction rates. For the extinction cases, the use of EDC with finite-rate chemistry is able to predict fairly well the combustion efficiency in conditions far from extinction and during complete extinction. The onset to flame extinction is predicted less satisfactorily, with the discrepancies attributed to radiation modelling and the use of a simplified reaction mechanism.

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在管式燃烧器配置中采用放电加工和放电加工/定速方法探索研究湍流模型对火焰熄灭的影响

论文介绍了对湍流线燃烧器的大涡流模拟，并研究了湍流建模对不同程度火焰熄灭的影响。经典的 Smagorinsky 模型以及单方程模型的静态和动态版本被应用于亚网格尺度湍流建模。在此背景下，考虑了两种不同的燃烧模型：具有无限快化学反应的涡耗散模型（EDM）和具有简化有限速率化学反应的涡耗散概念（EDC）。通过考虑一阶和二阶统计与实验数据的比较，对模型进行了评估。结果表明，在没有熄灭的情况下，使用动态一方程湍流模型与任何一种燃烧模型相比都表现不佳。分析表明，动态确定的湍流模型参数对混合时间尺度和由此产生的反应速率有显著影响。对于熄灭情况，使用有限速率化学的 EDC 能够相当好地预测远离熄灭和完全熄灭条件下的燃烧效率。对火焰熄灭的预测不太令人满意，差异归因于辐射建模和使用了简化的反应机制。

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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.