COMPREHENSIVE MODELING OF TURBULENT FLAMES WITH THE COHERENT FLAME-SHEET MODEL .1. BUOYANT DIFFUSION FLAMES

A modified version of the computational fluid dynamics code KIVA-II wa s used to model the transient behavior of buoyant turbulent diffusion flames burning in still air Besides extensions to the range of permitt ed boundary conditions and the addition of buoyancy terms to the turbu lence model, KIVA-II was augmented by a version of the coherent flame sheet model, Tesner's soot generation model, Magnussen's soot oxidatio n model, and an implementation of the discrete transfer radiation mode l that included both banded and continuum radiation. The model capture d many of the features of buoyant turbulent flames. Its predictions su pported experimental observations regarding the presence and frequency of large-scale pulsations and regarding axial distributions of temper ature, velocity, and chemical species concentrations. The radial struc ture of the flame was less well represented The axial radiative heat f lux distribution from the flame highlighted deficiencies in the soot g eneration model, suggesting that a model of soot particle growth was r equired.