Contribution To The Modelling Of Vertical Burning Walls

Until now, very few works have been devoted to the prediction of the flame struct]Jre resulting from the combustion of a vertical burning wall adjacent to a rectangular pool fire at the floor level. We describe the application of a three-dimensional model to the prediction of the aerodynamic field and the thermal structure using a finite volume method for solving the fluid dynamic equations. The model employs a two-equations k-s turbulence model. The gasphase, non-premixed combustion process is modeled via the conservated scalar/prescribed density function approach. We aJso incorporated our parabolized numerical technique into a turbulent diffusion flame model to predict the pyrolysis rate and buoyancy-induced flow between vertical parallel burning walls. The strong coupling of the pyrolysis rate and waJl fireinduced flow, in parallel configuration., is for the first time modeled, by including the effects of the streamwise pressure gradient. Transport equations for momentum, mass, gas-phase mixture fraction and enthalpy are solved using a finite volume method. A two-dimensionaJ adaptation of the Discrete Ordinates Method is used for estimating the flame radiation energy to the burning wall. Soot model is aJso included in order to permit application to radiative heat transfer within a flame.