G0601-7-4 Evaluation of Preferential Diffusion Effect and Its Consideration to United Combustion Model for Premixed and Diffusion Flames

Abstract

This paper proposes a unified model that includes preferential diffusion effect of hydrogen. As hydrogen has a larger diffusion coefficient than methane and oxygen, the mass fraction of hydrogen varies in a curved premixed flame. This phenomenon is well known as preferential diffusion effect of hydrogen. To simulate combustion phenomena of multi component fuel which includes large quantities of hydrogen accurately, preferential diffusion effect should be considered on the combustion model. On this paper, a simple model of the diffusion process of fuel in the premixed gas was evaluated analytically and results were applied to the author's combustion model. Results were compared with the experimental data by Kido and Nakahara and were in good agreement.