Abstract
Numerical computations are carried out for laminar jet diffusion flames taking detailed chemical kinetics and multicomponent diffusion into consideration. Attention is paid to the effects of the preferential diffusion of heat and species. The results obtained are as follows.(l) The computations predict well the experimental profiles of temperature, major species and OH radical concentration. (2) Significantly different temperatures in usual and reversed flames are predicted and verified by experiments. The excess of enthalpy and concentration of H2 species induced by the preferential diffusion are responsible for the different temperature characteristics. (3) The preferential diffusion effects are analyzed, based on the transport equations of enthalpy and the parameter controlling the H2 concentration, to identify the important species for the preferential diffusion. (4)The accumulation of the preferential diffusion effect along the flow affects the flame temperature significantly together with the effects of the flame curvature.
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