Abstract
A flamelet-based subgrid soot-radiation model, which applies the laminar smoke point concept for soot formation, is further developed to account for varying oxygen concentration (χO2) and applied in radiation modeling of buoyant, turbulent diffusion flames. The model is verified against experimental data for laminar flames. A lookup table of radiant emission fractions is developed by parametrizing the flamelet model with a range of strain rates, enthalpy defect (prior heat loss) and χO2. The three-dimensional lookup table is then used in the large eddy simulations (LES) to predict the turbulent flame-sheet radiant emission. LES of optically-thin, buoyant, turbulent ethylene diffusion flames of 10 and 15 kW heat release rates (HRR) are conducted for χO2 in the range of 0.13 - 0.21. With decreasing χO2, the overall radiant fraction and the peak radiant power output from the flames are shown to decrease, as would be expected. Predicted results for radiant power distributions, overall radiant fraction and temperatures show reasonably good comparison against experimental data.
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