Planck Mean Absorption Coefficients of H2O, CO2, CO and NO for radiation numerical modeling in combusting flows

The Weighted-Sum-of-Gray-Gases Model (WSGGM), based on temperature dependent weighting factors, is an efficient method of determining the absorption coefficients in numerical modeling of combusting flows. Weighting factors are obtained by polynomial fitting of experimental data for only two reagents (H2O and CO2) to the analytical equation for emissivity. In this article the use of Planck Mean Absorption Coefficients (PMAC) for H2O, CO2, CO and NO in combustion numerical modeling is proposed. The aim of the PMAC approach is to improve the initial solution of temperature and species mass fraction profiles in numerical modeling of non-premixed methane combustion. The proposed model is verified against the results of turbulent, non-premixed methane combustion experimental data. The implemented PMAC model represents the flue gas composition and temperature more accurately than the WSGGM.