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Statistical Analysis and Verification of a New Premixed Combustion Model with DNS Data

机译:DNS数据新预混燃烧模型的统计分析与验证

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摘要

In this paper, a new analytical premixed flamelet pdf model based on a surrogate reaction source term, is verified with a planar laminar flame and validated using explicitly filtered direct numerical simulation (DNS) data of statistically planar turbulent premixed flames with single-step irreversible Arrhenius chemistry at two different Karlovitz numbers. It is shown that the modeled filtered reaction source term (omega) over bar (m) is in excellent agreement with the one using the Arrhenius source term (omega) over bar (m) for the planar laminar flame over a wide range of filter widths. The model performs also very well on the filtered turbulent DNS data provided that a flame normalized Xi(iso) (c(iso)) surface area is incorporated. Interestingly, the model performance improves with increasing filter widths. This makes it an ideal candidate for high-pressure premixed combustion where usually the filter widths Delta(LES) are much larger than the flame's thermal reaction zone thickness delta(th).
机译:本文采用基于替代反应源期限的新的分析预混爆炸式PDF模型,通过平面层状火焰验证,并使用明确滤波的直接数值模拟(DNS)数据进行统计上平面湍流预混火焰的验证,单步不可抗拒的Arrhenius化学在两个不同的卡尔沃茨号码。结果表明,与使用Arrhenius源术语(Omega)的宽度(m)在宽范围的过滤器宽度上,模型过滤的反应源术语(ω)与使用Arrhenius源术语(Omega)的磁场(ω)的一致性相一致。该模型在滤波的湍流DNS数据上也非常好,只要包含火焰归一化Xi(ISO)(C(ISO))表面积。有趣的是,模型性能随着滤波器宽度的增加而改善。这使其成为高压预混燃烧的理想候选者,其中通常滤波器宽度δ(LES)远大于火焰的热反应区厚度Δ(Th)。

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