Abstract
Numerical computations are made of axisymmetric laminar jet H2 diffusion flames, taking account of multicomponent diffusion and detailed chemical kinetics. Availability of multicomponent diffusion calculation is investigated by comparison between the computational results with exact multicomponent diffusion coefficients or effective binary diffusivity and experimental results. The effect of thermal diffusion is also investigated. Computational results with exact method are close to experimental results for major species. Consideration of thermal diffusion improves the accuracy of the prediction. When fuel is H2 diluted with N2, mass flux of major species calculated with effective binary diffusivity agrees with that with exact multicomponent diffusion coefficient except for N2 and the results of concentration agree with experimental results. In the pure H2 diffusion flame, concen-tration and mass flux of N2 and H2O obtained by the numerical method with effective binary diffusivity disagree with that by exact method or experimental results. Excessive diffusion of H2 is caused by the assumption that spatial gradient of mean molecular weight is neglected.
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