Heat Transfer Modeling in the Context of Large Eddy Simulation of Premixed Combustion with Tabulated Chemistry
Heat Transfer Modeling in the Context of Large Eddy Simulation of Premixed Combustion with Tabulated Chemistry
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DOI：
10.1007/s10494-013-9492-6
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
A. Ketelheun;G. Kuenne;J. Janicka
中科院分区：
文献类型：
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作者：
A. Ketelheun;G. Kuenne;J. Janicka
列表化学模型，如小火焰生成流形方法是一个很好的方法，包括在合理的计算成本在湍流火焰的反应动力学的详细信息。然而，到目前为止，并非所有的信息，例如热损失包含在这些模型。由于这些经常出现在典型的技术应用中，燃烧室中的封闭火焰，扩展到标准的FGM方法将在本文中，允许非绝热边界的表示。引入焓作为表访问的附加控制变量，使得化学数据库变成三维的，其中混合分数、反应进程变量和焓描述热化学状态。本文提出的模型首先验证了一个二维封闭本生火焰，然后应用于大涡模拟的湍流预混旋流火焰与水冷海崖体和湍流分层火焰，其中包括额外的建模火焰结构，使用人工加厚火焰。结果是令人鼓舞的，因为在实验和模拟中都可以观察到旋流火焰中的海崖体温度降低以及分层配置中的引燃火焰废气的冷却。
Tabulated chemistry models like the Flamelet Generated Manifolds method are a good approach to include detailed information on the reaction kinetics in a turbulent flame at reasonable computational costs. However, so far, not all information on e.g. heat losses are contained in these models. As those often appear in typical technical applications with enclosed flames in combustion chambers, extensions to the standard FGM approach will be presented in this paper, allowing for the representation of non-adiabatic boundaries. The enthalpy as additional control variable for the table access is introduced, such that the chemistry database becomes three-dimensional with mixture fraction, reaction progress variable and enthalpy describing the thermo-chemical state. The model presented here is first validated with a two-dimensional enclosed Bunsen flame and then applied within the Large Eddy Simulations of a turbulent premixed swirl flame with a water-cooled bluff body and a turbulent stratified flame, where additional modeling for the flame structure using artificially thickened flames was included. The results are encouraging, as the temperature decrease towards the bluff body in the swirl flame and the cooling of the pilot flame exhaust gases in the stratified configuration can be observed in both experiments and simulation.