Numerical Simulations of the Sandia Flame D Using the Eddy Dissipation Concept
Numerical Simulations of the Sandia Flame D Using the Eddy Dissipation Concept
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DOI：
10.1007/s10494-014-9561-5
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发表时间：
2014-07
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影响因子：
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通讯作者：
D. Lysenko;I. S. Ertesvåg;Kjell Erik Rian
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文献类型：
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作者：
D. Lysenko;I. S. Ertesvåg;Kjell Erik Rian
使用可压缩雷诺平均模拟和大涡模拟（分别为 RAS 和 LES）计算湍流引导甲烷/空气扩散火焰（桑迪亚火焰 D）。涡耗散概念 (EDC) 用于湍流化学相互作用，假设分子混合和随后的燃烧发生在精细结构（较小的耗散涡流，接近柯尔莫哥洛夫长度尺度）中。假设完全湍流能量级联，使用 RAS 的标准 k-𝜖 湍流模型和 LES 的一方程涡粘子网格尺度模型来评估精细结构的特征长度和速度尺度。通过将精细结构视为由完美搅拌反应器 (PSR) 概念描述的恒压和绝热均相反应器（计算为常微分方程 (ODE) 系统）来考虑有限速率化学动力学。使用稳健的隐式龙格-库塔方法 (RADAU5) 对刚性 ODE 进行积分以评估反应速率。辐射传热采用 P1 近似处理。假设的 β-PDF 方法用于评估湍流-化学相互作用建模的影响。将数值结果与可用的实验数据进行比较。总的来说，RAS 和 LES 的当前模拟和测量之间有很好的一致性，这很好地表明了该方法的充分性和准确性及其在湍流燃烧模拟中的进一步应用。
A turbulent piloted methane/air diffusion flame (Sandia Flame D) is calculated using both compressible Reynolds-averaged and large-eddy simulations (RAS and LES, respectively). The Eddy Dissipation Concept (EDC) is used for the turbulence-chemistry interaction, which assumes that molecular mixing and the subsequent combustion occur in the fine structures (smaller dissipative eddies, which are close to the Kolmogorov length scales). Assuming the full turbulence energy cascade, the characteristic length and velocity scales of the fine structures are evaluated using a standardk-𝜖turbulence model for RAS and a one-equation eddy-viscosity sub-grid scale model for LES. Finite-rate chemical kinetics are taken into account by treating the fine structures as constant pressure and adiabatic homogeneous reactors (calculated as a system of ordinary-differential equations (ODEs)) described by a Perfectly Stirred Reactor (PSR) concept. A robust implicit Runge-Kutta method (RADAU5) is used for integrating stiff ODEs to evaluate reaction rates. The radiation heat transfer is treated by the P1-approximation. The assumedβ-PDF approach is applied to assess the influence of modeling of the turbulence-chemistry interaction. Numerical results are compared with available experimental data. In general, there is good agreement between present simulations and measurements both for RAS and LES, which gives a good indication on the adequacy and accuracy of the method and its further application for turbulent combustion simulations.