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首页> 外文期刊>Flow, turbulence and combustion >LES of Premixed Methane Flame Impinging on theWall Using Non-adiabatic Flamelet Generated Manifold (FGM) Approach
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LES of Premixed Methane Flame Impinging on theWall Using Non-adiabatic Flamelet Generated Manifold (FGM) Approach

机译:使用非绝热小火焰产生歧管(FGM)方法的预混合甲烷火焰LES撞击墙壁

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摘要

In this paper LES of flame wall interaction using a non-adiabatic FGM approach is reported for a premixed methane fuel jet impinging on a spherical disk. Nitrogen is used as co-flow in order to avoid the interaction with the surrounding air and combustion. The flow field is described by means of the Smagorinsky model with Germano procedure for SGS stresses. The SGS scalar flux in scalar transport equations is modeled by the linear eddy diffusivity model. Two aspects are especially addressed in this paper. First focus is on the grid resolution required near the wall without including a special wall-adapted SGS modeling in reacting configurations. The second aspect is devoted to the integration of the near wall kinetic effects into the FGM framework. The results for the flow field, mixing and combustion properties are presented and analyzed in terms of grid resolution, Reynolds number (in reacting and non-reacting case) and adiabaticity. Comparisons with available experimental data showsatisfactory agreement. An outline of the thermal and flow boundary layer analysis is subsequently provided.
机译:在本文中,报道了使用非绝热FGM方法的火焰壁相互作用的LES,它撞击在圆盘上的预混合甲烷燃料射流。氮气用作并流以避免与周围空气和燃烧的相互作用。流场是通过Smagorinsky模型和Germano程序描述的,用于SGS应力。用线性涡流扩散率模型对标量输运方程中的SGS标量通量进行建模。本文特别针对两个方面。首先关注的是壁附近所需的网格分辨率,而在反应配置中不包括适应壁的特殊SGS建模。第二方面致力于将近壁动力学效应整合到FGM框架中。给出了流场,混合和燃烧特性的结果,并根据网格分辨率,雷诺数(在反应和非反应情况下)和绝热性进行了分析。与可用实验数据的比较显示令人满意的一致性。随后提供了热边界层和流动边界层分析的概述。

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