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A Comparison of Finite-Rate Kinetics and Flamelet-Generated Manifold Using a Multiscale Modeling Framework for Turbulent Premixed Combustion

机译：使用湍流预混燃烧的多尺度建模框架对有限速率动力学和火焰小流形的比较

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摘要

Turbulent premixed flames observed in combustion devices exhibit the presence of multiscale and nonlinear turbulence-chemistry interactions, which make predictions using large-eddy simulation (LES) extremely challenging. In this study, two well-established chemistry modeling paradigms, namely, finite-rate chemistry (FRC) and flamelet generated manifold (FGM) are compared using the same computational framework to assess their predictive capabilities. The classical FGM-based framework for LES is extended further by using it in the linear eddy mixing (LEM) model for the closure of the filtered source term for the scalar field. The assessment is performed using two computational setups, a canonical configuration of a freely propagating methane-air turbulent premixed flame, and a practically relevant swirl premixed combustor, both in the thin reaction zone regime, where the focus is to examine the effects of chemistry modeling paradigm and SGS turbulence-chemistry interactions. While for the first setup, direct numerical simulation (DNS) is considered as a reference for comparison of different models, for the second configuration, the results are compared with the available experimental data. Overall, while mean flow features are predicted reasonably well by the FGM-based approaches, quantitative differences are observed for intermediate species and conditional statistics when compared with the FRC-based approaches, and possible reasons for these differences are discussed.
机译：在燃烧设备中观察到的湍流预混火焰表现出多尺度和非线性湍流-化学相互作用的存在，这使得使用大涡模拟（LES）进行预测非常具有挑战性。在这项研究中，使用相同的计算框架比较了两个完善的化学建模范例，即有限速率化学（FRC）和火焰生成歧管（FGM）。 LES的经典基于FGM的框架通过在线性涡流混合（LEM）模型中使用它来进一步扩展，以关闭标量字段的滤波源项。评估是使用两种计算设置进行的，即在稀薄反应区中自由传播的甲烷-空气湍流预混火焰的规范配置和实用相关的旋流预混燃烧器，重点是检查化学模型的影响范式和SGS湍流化学相互作用。对于第一种设置，直接数值模拟（DNS）被视为比较不同模型的参考，而对于第二种配置，将结果与可用的实验数据进行比较。总体而言，虽然基于FGM的方法可以很好地预测平均流量特征，但与基于FRC的方法相比，可以观察到中间物种和条件统计的数量差异，并讨论了造成这些差异的可能原因。

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