Acoplamento de cinética química a ciclos motores Beau de Rochas a gás de tempo finito

Abstract

In the study of the Beau de Rochas gas cycle, several models, for the analysis of different simplifying hypotheses, can be carried out, such as the FTHA, where the heat addition occurs non-instantaneously and non-isochorically, however, there is a need to add combustion time as an input parameter. This work presents models of finite-time spark ignited four-stroke gas engine cycles, with the variation between air-standard and air-fuel combustion modeling, adding to these an approximation of the combustion time, through two simple distinct approaches: with static chemical kinetics or with dynamic chemical kinetics, both with a global kinetic mechanism for a bimolecular non-elementary combustion reaction. The comparison between both chemical kinetics approaches, and also between the models developed, is shown in a series of thermodynamic diagrams, with the observation of slow combustion and thermal explosion phenomena.