MODELING OF CONDITIONAL DISSIPATION RATE FOR FLAMELET MODELS WITH APPLICATION TO LARGE EDDY SIMULATION OF FIRE PLUMES

PAUL E. DESJARDIN

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MODELING OF CONDITIONAL DISSIPATION RATE FOR FLAMELET MODELS WITH APPLICATION TO LARGE EDDY SIMULATION OF FIRE PLUMES

机译：火焰模型条件耗散率的建模及其在火羽的大涡模拟中的应用

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Subgrid scale (SGS) combustion modeling using flamelet approximations require a model for the conditional dissipation rate. For high Reynolds number flow, statistical independence between the mixture fraction and dissipation is often invoked allowing the conditional dissipation to be expressed in terms of its mean filtered value. This assumption fails for application to pool fires because of the transitionally turbulent nature of this class of flows. In this study, an alternative closure for conditional dissipation rate is proposed based on a transport equation for the mixture fraction filtered probability density function. Application of this model for use in Large Eddy Simulation (LES) of a large, 1 m in diameter, methane-air fire plume results in greatly improved predictions over existing models that invoke the use of statistical independence when comparisons are made to experimental measurements.

机译：使用小火焰近似的亚网格规模（SGS）燃烧建模需要条件耗散率的模型。对于高雷诺数流，通常会调用混合分数与耗散之间的统计独立性，从而允许条件耗散以其平均滤波值表示。由于此类流量具有过渡性的湍流特性，因此该假设无法应用于集火。在这项研究中，基于混合分数滤波概率密度函数的输运方程，提出了一种条件耗散率的替代闭包。将该模型用于直径为1 m的大型甲烷-空气火羽的大型涡流模拟（LES）中，与现有模型相比，与现有模型相比，该模型的预测得到了极大的改进，在与实验测量值进行比较时，该模型调用了统计独立性。

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来源
《Combustion Science and Technology》 |2005年第10期|p.1883-1916|共34页
作者
PAUL E. DESJARDIN;
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作者单位

Department of Mechanical and Aerospace Engineering, University at Buffalo, the State University of New York, Buffalo, New York, USA;

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原文格式 PDF
正文语种 eng
中图分类热力工程、热机;
关键词
flamelet modeling; PDF; LES; fire plumes;

机译：火焰模型;PDF;LES;火羽;

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机译：使用涡流消散和辐射火焰燃烧模型预测实用，非混合湍流火焰中的NO_X生成
2. Numerical predictions of a turbulent diffusion flame in a cylindrical combustor using eddy dissipation and flamelet combustion models [J] . C. Y. Ma, T. Mahmud, P. H. Gaskell, Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science . 1999,第C7期

机译：基于涡流消散和小火焰燃烧模型的圆柱燃烧室湍流扩散火焰数值预测
3. Large eddy simulations of partially premixed ethanol dilute spray flames using the flamelet generated manifold model [J] . El-Asrag Hossam A., Braun Markus, Masri Assaad R. Combustion theory and modelling . 2016,第4期

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4. On the Modeling of the Flamelet Model Conditional Dissipation Rate for LES of Pool Fires [C] . Paul E. DesJardin Proceedings of the third joint meeting of the US Sections of the Combustion Institute . 2003

机译：池火LES的小火焰模型条件耗散率建模
5. Subgrid models for large eddy simulation: Scalar flux, scalar dissipation and energy dissipation. [D] . Chumakov, Sergei G. 2005

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机译：1 HCCI发动机模拟的小火焰模型的标量耗散率模型

MODELING OF CONDITIONAL DISSIPATION RATE FOR FLAMELET MODELS WITH APPLICATION TO LARGE EDDY SIMULATION OF FIRE PLUMES

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