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首页> 外文会议>International Symposium on Combustion; 20060805-11; University of Heidelberg(DE) >Direct numerical simulation of turbulence-radiation interactions in homogeneous nonpremixed combustion systems
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Direct numerical simulation of turbulence-radiation interactions in homogeneous nonpremixed combustion systems

机译：均匀非预混燃烧系统中湍流-辐射相互作用的直接数值模拟

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摘要

An important issue in chemically reacting turbulent flows is the interaction between turbulence and radiation (turbulence-radiation interactions-TRI). TRI arises from highly nonlinear coupling between fluctuations in temperature and species composition with the fluctuations of radiative intensity. Here direct numerical simulation (DNS) has been employed to investigate TRI in a statistically homogeneous nonpremixed system. A photon Monte Carlo method has been used to solve the radiative transfer equation (RTE). Radiation properties correspond to a nonscattering fictitious gray gas with a Planck-mean absorption coefficient that mimics that of typical hydrocarbon-air combustion products. Individual contributions of emission and absorption TRI have been isolated and quantified. The temperature self-correlation, the absorption coefficient-Planck function correlation, and the absorption coefficient-intensity correlation have been examined for intermediate-to-large values of the optical thickness, and contributions from all three correlations have been found to be significant. Emission TRI has also been estimated analytically using a β PDF model. The β PDF results are in good agreement with DNS results. This suggests that relatively simple models for emission TRI in nonpremixed systems might be developed based on a modeled equation for mixture fraction variance.
机译：对湍流进行化学反应的一个重要问题是湍流与辐射之间的相互作用（湍流-辐射相互作用-TRI）。 TRI是由于温度和物种组成与辐射强度的波动之间存在高度非线性耦合而引起的。在这里，直接数值模拟（DNS）已用于研究统计均质的非预混系统中的TRI。已经使用光子蒙特卡洛方法来求解辐射传递方程（RTE）。辐射特性对应于具有普朗克平均吸收系数的非散射虚拟灰色气体，该吸收系数模仿典型的碳氢化合物空气燃烧产物的吸收系数。发射和吸收TRI的各个贡献已被隔离和量化。对于光学厚度的中到较大值，已经检查了温度自相关，吸收系数-普朗克函数相关和吸收系数-强度相关性，并且发现所有这三个相关性的贡献都很显着。排放TRI也已使用βPDF模型进行了分析估算。 βPDF结果与DNS结果非常吻合。这表明，可以基于混合分数变化的模型方程，开发非预混系统中排放TRI的相对简单的模型。

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