Modelagem computacional do processo de ignição na combustão de um meio poroso reativo

Abstract

A material which is susceptible to a chemical changing is considered a reactive porous medium. Fuels are materials capable to release energy when react with oxygen and can be considered as a reactive porous medium. The aim of this work is to model combustion in a medium like that. The model was implemented in a computer program to simulate the propagation of the combustion front in a fixed bed reactive porous medium. It takes into account reaction mechanisms that may occur during the process. Subroutines that solve the conservation equations in the modeling were validated through comparative analysis between the numerical and analytical solutions or experimental solutions. In this way, it insures that the model was able to generate real and consistent results. Also, an investigation was carried out about the influence that the adopted reaction mechanism for the modeling of chemical reactions has on the temperature profile in the ignition of the combustion bed. The tests showed the model is sensible to the changes of the reaction mechanism. Furthermore, the model points its possibility to predict, on the temperature evolution, the ignition phenomenon