Global sensitivity analysis is applied to the combustion of n-butanol. The sensitivity of both ignition delay times and species concentrations are studied with respect to uncertainties in the reaction rate coefficients. It is demonstrated that the ignition delay times are sensitive to only a few rate coefficients, as are each of the species we studied. Comparisons are made to reaction pathway analysis. In the speciation studies, it is shown that two types of reactions have large global sensitivity coefficients. The first type promotes the formation of a given species and is identified in a reaction pathway analysis. The second type inhibits the formation of the species and is not directly identified in reaction pathway analysis. In order to accurately predict the formation of a given species, both of these types of reactions need to be accurately modeled when their global sensitivity coefficients are large. In this paper we also describe recently developed techniques to reduce the number of samples that are necessary for producing accurate global sensitivity coefficients.
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