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the computation of radiation with both the CR-WSGG and NCR-WSGG models provided better results than GG model, when compared with experimental data. For the combustion chamber and turbulence and combustion models employed in the present work, it was shown that the CR-WSGG is the recommended model, due to the acceptable agreement with experimental data and relatively low computational requirements in comparison to the NCR-WSGG model. The results show the importance of thermal radiation for an accurate prediction of the thermal behavior of a combustion chamber.

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Radiation effects of non-gray gases were estimated by the WSGG model based on new correlations and including TRI, for a turbulent diffusion methane-air flame, to evaluate the influence of radiation on the overall thermal behavior. Comparing results from the simulations (calculations with/without radiation, and with/without TRI), it was verified that temperature, radiative heat source, and wall heat flux were importantly affected, while the influence on species concentrations was negligible. Numerical results considering radiation, when compared to the case neglecting it, were closer to experimental data presented in the literature. Inclusion of TRI enhanced that agreement, although the influence of radiation (without TRI) was still greater than of TRI. The main influence of TRI was on global results (peak temperature, radiant fraction). Therefore, to achieve correct simulated predictions for the thermal behavior of a combustion chamber, it is mandatory to use a proper radiation model, and if possible, including TRI KEYWORDS.

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