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首页> 外文期刊>Combustion Science and Technology >RADIATIVE EMISSION AND REABSORPTION IN LAMINAR, ETHYLENE-FUELED DIFFUSION FLAMES USING THE DISCRETE ORDINATES METHOD
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RADIATIVE EMISSION AND REABSORPTION IN LAMINAR, ETHYLENE-FUELED DIFFUSION FLAMES USING THE DISCRETE ORDINATES METHOD

机译：离散准则法在乙烯扩散层流中的辐射释放与吸收

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Thermal radiation from laminar, sooting, coflow diffusion flames at atmospheric pressure has been studied computationally as a function of ethylene fuel dilution by nitrogen. These flames had previously been investigated using laser diagnostics and thermocouple-gas sampling probe techniques, and the measured soot levels had been satisfactorily predicted by a sectional soot kinetics model. In this work, the discrete ordinates method for solution of the equation of radiative transfer in axisymmetric cylindrical coordinates has been coupled to the flow's energy conservation equation through the calculated divergence of the net radiative flux. Two self-consistent models for the absorption/emission of radiation by soot, CO2, H2O, CO, and ethylene were considered: the Planck mean model and one based on narrowband, wavelength-dependent absorption. The wavelength-dependent calculation was found to predict much more substantial reabsorption effects; we conclude that the Planck mean model inadequately characterizes reabsorption for these sooting flames. Reabsorption of radiation has been found to be important for accurate prediction of overall radiated power, even in relatively small, atmospheric pressure flames with modest soot levels, and carbon dioxide was found to play a dominant role in both the emission and absorption spectra. In addition, the role of long wavelength radiation, absorption by the ethylene fuel, the spatial distribution of net radiation within these diffusion flames, and the impact of gridding upon the results are discussed.
机译：通过计算研究了大气压下层流，烟灰，顺流扩散火焰的热辐射与乙烯燃料被氮气稀释的关系。以前已经使用激光诊断和热电偶气体采样探针技术对这些火焰进行了研究，并且通过截面烟尘动力学模型令人满意地预测了测得的烟尘水平。在这项工作中，通过计算出的净辐射通量的发散度，用于求解轴对称圆柱坐标系中的辐射传递方程的离散坐标法已与流的能量守恒方程耦合。考虑了两个自洽的烟灰，CO2，H2O，CO和乙烯对辐射的吸收/发射模型：普朗克均值模型和一个基于窄带，与波长有关的吸收的模型。发现与波长有关的计算可以预测更多的重吸收效果。我们得出的结论是，普朗克均值模型不足以表征这些煤烟火焰的重吸收。已经发现辐射的重吸收对于准确预测总辐射功率非常重要，即使在烟灰水平适中的相对较小的大气压火焰中，也发现二氧化碳在发射光谱和吸收光谱中都起着主要作用。此外，还讨论了长波长辐射的作用，乙烯燃料的吸收，这些扩散火焰中净辐射的空间分布以及网格对结果的影响。

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