Gas Radiation Spectral Correlated Approaches for Industrial Applications

Abstract

The errors introduced by spectrally non correlated methods in the prediction of thermal radiation from real gases may be very important and non controlled. Two kinds of correlated narrow-band models are presented here. First, statistical narrow-band (SNB) model principles are recalled and the derivation of the required parameters is discussed. Some applications of SNB models to onedimensional and multidimensional radiative transfer are shown. An other approach, called the correlated-K distribution (C-K) method, which consists in reordering the absorption coefficient and integrating radiative quantities over the cumulative distribution function, is extended here with the fictitious gas mixture (FG) idea, to account for strong temperature gradients. This method is particularly suitable for gas-particle absorbing, emitting and scattering media where SNB models do not apply. It is shown to be also superior to SNB models with the Curtis-Godson approximation in the case of high pressure gradients.