The effect of variations in fluid properties on the analysis of a stagnation point diffusion flame has been studied by means of a numerical calculation. The thermochemistry of the flame was prescribed by an empirical correlation of species concentrations and temperature with a conserved scalar (the fuel atom mass fraction). In this way the mixing process in the diffusion flame was decoupled from the chemical kinetics. Variations in the Schmidt number for the mixture fraction did not have a significant effect on the numerical prediction of the atom mass fraction profile in the flame. However, the assumption of a constant value for ρμ through the methane-air flame caused a significant overprediction of the mixing-layer thickness. An average value of ρμ through the boundary layer yielded satisfactory predictions of the mass fraction profile.
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Mechanical Engineering