EFFECTS OF TURBULENCE-RADIATION INTERACTIONS IN A NON-PREMIXED TURBULENT METHANE-AIR FLAME

Larissa Domingues Lemos, F. Centeno, F. França
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Abstract

This work studied a turbulent flame and analyzed the interaction between turbulence and radiation (TRI). The problem consists of a non-premixed turbulent methane flame surrounded by a low-velocity air coflow identified as Flame DLR-A. The steady laminar diffusion flamelet (SLDF) model is used to solve the chemical kinetics. To generate the flamelet library, turbulence-chemistry interaction is taken into account through previously assumed probability density functions (PDF) of mean scalars. Radiative heat flux is calculated with the discrete ordinates method, considering the Gray Gas model (GG). Turbulence is solved with k-ε Standard model and TRI methodology is based on temperature self-correlation. The solution is obtained using ANSYS/Fluent code coupled with user-defined functions (UDFs). Results indicated that the temperature and chemical species predictions are little affected by TRI, while the radiative quantities (radiative heat flux on the domain wall) are importantly affect by TRI effects.
非预混湍流甲烷-空气火焰中湍流-辐射相互作用的影响
本文以紊流火焰为研究对象,分析了紊流与辐射的相互作用。该问题包括一个未预混的湍流甲烷火焰,被低速空气共流包围,称为火焰DLR-A。采用稳定层流扩散小火焰(SLDF)模型求解化学动力学。为了生成小火焰库,湍流-化学相互作用通过先前假设的平均标量的概率密度函数(PDF)来考虑。考虑灰色气体模型(GG),采用离散坐标法计算辐射热流密度。湍流用k-ε标准模型求解,TRI方法基于温度自相关。利用ANSYS/Fluent代码与用户定义函数(udf)耦合得到求解结果。结果表明,TRI效应对温度和化学物质预测的影响较小,而对辐射量(畴壁上的辐射热通量)的影响较大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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