Análise quasi-dimensional da combustão em motores ICE utilizando a cinética química das reações

Abstract

This present work developed a deep study about combustion chemical delay in Otto cycle engines, fed with iso-octane.Such study has being made by computational simulations using an algorithm developed in Scilab programing language, which one has undergone especific modifications during the project, in order to adjust simulated data to the real motor vehicles characteristics.The quasi-dimensional combustion model was used in the source code development aiming to avoid typical mistakes of theoretical and non-dimensional models.To the chemical kinetic analysis of the problem, was made a link association between the numerical algorithm developed by Bertoldi (2007) and the group of chemical reactions from iso-octane combustion, proposed by Ming Jia and Mao-zaho (2006). The use of the mentioned models added to the intesive theoretical review, allowed this work achieving the goal of modeling a spark combustion engine, in order to establish the combustion chemical delay into that system and consequently, the ideal ignition advance angle. Such features were validated after comparison between power curves of three different vehicles, which there were no errors higher than 11%.