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首页> 外文期刊>Combustion Science and Technology >Assessment of Fractal/Wrinkling Theories for Describing Turbulent Reacting Fine Structures under MILD Combustion Regimes
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Assessment of Fractal/Wrinkling Theories for Describing Turbulent Reacting Fine Structures under MILD Combustion Regimes

机译：评估分形/皱纹理论，用于描述温和燃烧制度下的湍流反应细结构

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摘要

This paper presents an assessment study of a modification introduced to a recently developed extended version of Eddy Dissipation Concept (EDC) chemistry/flow interaction approach for modeling Moderate or Intense Low-oxygen Dilution (MILD) combustion conditions. Compared to traditional combustion regimes, MILD combustion systems produce higher thermal efficiency and lower pollutant emissions. However, numerical simulation of turbulent flames under MILD combustion conditions poses challenges mainly due to strong coupling between turbulent flow and chemical kinetics over a wide range of turbulent flow conditions. Hence, combustion modeling is key for describing the interaction between chemistry and turbulent flow in MILD reacting flow regimes. This study examines the performance of a hybrid combustion approach (called hereafter wrinkling-EDC) which models the reacting scales of turbulent flows based on a fractal-based flame surface density and turbulent intermittency approaches in, respectively, premixed and diffusion flame regimes. Simulations are performed for two MILD combustion conditions of a Jet-in-Hot-Coflow burner, namely HM1 and HM3 flames, using wrinkling-EDC as well as the extended EDC. In addition, the results of the standard EDC model are provided for reference. The predictions of all three models are compared with their counterparts' experimental measurements of temperature and species concentrations. For both HM1 and HM3 flames, the results indicate that, compared to the standard and extended EDC approaches, the wrinkling-EDC model produces better predictions of the mixing field (close to the centerline of the burner) and temperature field. However, the predictions of all models become more comparable downstream of the burner. In addition, while all models produce comparable predictions of major species, intermediate and slow-forming species are best predicted downstream of the burner by the standard EDC model.
机译：本文介绍了对涡流耗散概念（EDC）化学/流动相互作用方法的最近开发的扩展版本的修改的评估研究，用于建模中等或强烈的低氧稀释（温和）燃烧条件。与传统的燃烧制度相比，轻度燃烧系统产生更高的热效率和较低的污染物排放。然而，温和燃烧条件下的湍流火焰的数值模拟主要是由于湍流和化学动力学在广泛的湍流条件下的强烈耦合，主要是由于湍流和化学动力学之间的强烈耦合。因此，燃烧建模是描述在温和反应流动方案中化学和湍流之间的相互作用的关键。该研究检查了混合燃烧方法（称为皱纹-EDC）的性能，其基于分别基于的火焰表面密度和湍流间歇性方法，模拟湍流流动的反应尺度分别，分别是预混合的和扩散火焰制度。使用紫红色EDC以及延伸的EDC对喷气式热 - COFLOW燃烧器的两个温和燃烧条件进行模拟，即HM1和HM3火焰。此外，提供了标准EDC模型的结果以供参考。将所有三种模型的预测与其对应于温度和物种浓度的实验测量进行比较。对于HM1和HM3火焰，结果表明，与标准和扩展EDC方法相比，皱纹EDC模型产生更好的预测混合场（靠近燃烧器的中心线）和温度场。然而，所有模型的预测变得更加可比燃烧器下游。此外，虽然所有模型都产生了主要物种的可比预测，但是通过标准EDC模型最佳地预测燃烧器下游的中间体和慢形成物种。

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