Prediction of Fire Growth on Furniture Using CFD

摘要

The problem of fire growth prediction differs from other forms of combustion modeling (furnaces, engines, power generation etc.) in the prior knowledge about fuel supply. For most combustion situations, the fuel composition and flow rate is known, simplifying input for the numerical modeler. When a user specifies the source for combustion, a deterministic fire model principally functions to predict the energy and fluid flow through the domain resulting from the source. For these problems, a user-specified mass rate of fuel is appropriate. contrast this to the compartment fire growth problem where the heat feedback from the fire itself controls the rate of fuel generation, the composition of which is not well defined or known in advance. As a result, when one wants to model fires inside compartments, a user specified source term for pyrolysis is often a poor assumption. A better approach is to use the model to calculate the source terms based on surface pyrolysis rates that are a function of the local environment. compartment conditions therefore control the fire growth.