Turbulent Reynolds number dependence of flame surface density transport in the context of Reynolds averaged Navier-Stokes simulations
Turbulent Reynolds number dependence of flame surface density transport in the context of Reynolds averaged Navier-Stokes simulations
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DOI：
10.1016/j.proci.2012.07.071
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
N. Chakraborty;R. Cant
中科院分区：
文献类型：
--
作者：
N. Chakraborty;R. Cant
湍流雷诺数Reton的统计行为和火焰表面密度（FSD）传输的建模的影响进行了分析，使用的自由传播的湍流预混火焰的直接数值模拟（DNS）数据库的Retranging值从20到100。Retis的变化是通过修改Damköhler数和Karlovitz数而实现的。研究结果表明，定性行为的各种条款的FSD运输方程保持不受湍流雷诺数的变化，但它们的相对贡献的FSD运输在一定程度上的影响。详细讨论了湍流雷诺数对湍流输运项、切向应变率项以及传播和曲率项的影响。结果表明，湍流输运和切向应变率项的模型参数表现出湍流雷诺数的依赖性，小值的Retand假设渐近值为Ret 50。相比之下，组合的传播和曲率项的模型参数被发现是不敏感的湍流雷诺数的变化。现有的湍流传输项和切向应变率项的模型进行修改，以考虑所观察到的湍流雷诺数的依赖性。
The influence of turbulent Reynolds number Reton the statistical behaviour and modelling of flame surface density (FSD) transport has been analysed using a direct numerical simulation (DNS) database of freely propagating turbulent premixed flames with values of Retranging from 20 to 100. The variation of Retis brought about by modifying the Damköhler and Karlovitz numbers independently of each other. The findings indicate that the qualitative behaviour of the various terms of the FSD transport equation remains unaffected by the changes in turbulent Reynolds number, but their relative contributions to the transport of FSD are affected to some extent. The effects of turbulent Reynolds number on the modelling of the turbulent transport term, the tangential strain rate term and the combined propagation and curvature terms are addressed in detail. It is demonstrated that model parameters for the turbulent transport and tangential strain rate term exhibit turbulent Reynolds number dependence for small values of Retand assume asymptotic values for Ret⩾50. By contrast, the model parameters for the combined propagation and curvature term are found to be insensitive to the variation of turbulent Reynolds number. Existing models for the turbulent transport term and the tangential strain rate term are modified to account for the observed turbulent Reynolds number dependence.