Radiative dissipation in planar gas-soot mixtures

Abstract

A theoretical expression for the gas cooling rate (radiative dissipation) in planar mixtures of soot and combustion product gases is derived that is valid for all degrees of optical thickness. The absorption terms are reduced to numerical quadrature over the coordinate normal to the flame structure, and describe soot and gas self-absorption, as well as soot-gas spectral overlap effects. Numerical examples illustrating the effect of radiative cooling on NO production in a model, sooting, opposed jet diffusion flame are given.