Mathematical modeling of the combustion of an overfueled aluminum–air mixture based on the nonequilibrium thermodynamics of the processes

This paper presents the results of mathematical modeling of the combustion of flow of a polyfractional micture of an aluminum powder in air taking into account the nonequilibrium nature of the process. The calculations were performed for values of the air-to-fuel ratio $\alpha=0.1-0.5$. Time dependences of thermodynamic parameters, the completeness of combustion of the metal particles, relative fractions of the residence time of the stream were obtained. The adequacy of the nonequilibrium model for describing thermodynamic processes is justified by comparing with the equilibrium model for time tending to $\infty$. The necessity of taking into account the formation of $\mathrm{Al}_2\mathrm{O}$ suboxide present in the range of the air-to-fuel ratio was analyzed and proved. The need to include nitriding reactions in the mathematical modeling for $0.1\le\alpha<0.4$ shown by comparing the results of calculations based on equilibrium and nonequilibrium thermodynamics.