For simulations requiring multiple fuel species, a few extra steps are required. This post demonstrates how to perform a multiple-fuel simulation using PyroSim. To use multiple-fuel reactions in an FDS simulation, it is necessary to specify the gas species and stoichiometry of the reactions. In the FDS User Guide, Section 13.2.2 “Complex Stoichiometry”, an example is given that demonstrates how to accomplish this using FDS directly. This post references that example frequently and readers are encouraged to have both documents available while working through this post. PyroSim supports the “simple chemistry” combustion model in FDS that considers a single fuel species composed of,, and that reacts with in one mixing-controlled step to form,, , and. The “simple chemistry” approach can only be used in FDS when there is a single mixing controlled reaction. For multiple reactions, you must specify the gas species and stoichiometry of the reactions. The Section 13.2.2 example shows how to model two simultaneously burning fuels, polyurethane and wood. In the example, polyurethane is defined by the chemical formula and the combustion reaction has a soot yield and a yield of. Similarly, wood is defined by the chemical formula and the reaction has a soot yield and a yield of.
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