Predictions of soot and thermal radiation properties in confined turbulentjet diffusion flames

Computational modeling of well-documented jet diffusion flames, burning met hane at atmospheric and elevated pressure, is presented. The main emphasis of the work is on the intimate coupling between the soot production rate an d the flame radiative heat loss. This coupling is found to be vital for fla me soot prediction. A number of methods for closing soot production source terms in the turbulent flow are presented and assessed. In particular it is shown that the degree of correlation assumed between soot particles and th eir oxidizing species exerts a large influence on both the growth of the so ot and its subsequent burnout. Finally, predictions of the mean radiative e mission spectra from these flames are presented. (C) 1998 by The Combustion Institute.