拡散火炎の数値解析のための多成分拡散の計算法の検討(熱工学,内燃機関,動力など)

概要

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In the numerical analysis of diffusion flames, multicomponent diffusion should be correctly evaluated, because various species with different diffusivities are generated in the process of combustion. In the evaluation of multicomponent diffusion, effective binary diffusivity is often adopted instead of exact multicomponent diffusion coefficient. For diffusion flames of H_2 or H_2 diluted with N_2, the accuracy of calculation by effective binary diffusivity is investigated by comparison with that of exact multicomponent diffusion. In multicomponent system, diffusion of a species is generally driven not only by its own concentration gradient but also by that of the other species. The accuracy of calculation by effective binary diffusivity tends to be worse, when the influence of the concentration gradient of the other species is larger than that of its own concentration gradient.
1997-01-25