炉内の燃焼と非灰色性を考慮したふく射伝熱の数値解析

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  • Numerical Simulation of Combustion and Nongray Radiative Heat Transfer in a Furnace and Its Comparison with Experiment.

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Numerical simulations of heat transfer in a furnace of practical scale were carried out, coupled with a prediction of the flame. Radiative heat transfer was computed taking its nongray characteristic into account. Convective heat transfer to the furnace wall was incorporated as well. The numerical computations were conducted based upon the conservation equations of mass, momentum, energy and species together with k-ε turbulence model and eddy dissipation model for estimating combustion rate. Radiative heat transfer was computed with the radiant heat ray method in combination with a weighted-sum-of-gray gas model or a wide-band model. Predicted results were compared with the experimental data. Comparisons showed that the profiles of temperature and species concentration can be predicted fairly well and that the weighted-sum-of gray gas model gives a good prediction of heat flux to the furnace wall as well as the wide-band model. Also the influence of soot on the furnace heat transfer was estimated.

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