Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
A predictive model for knock onset in spark-ignition engines using hydrous ethanol
Submission Author:
Francisco Renato dos Santos Junior , SP
Co-Authors:
Francisco Renato dos Santos Junior, Caio Rufino, Janito Vaqueiro Ferreira
Presenter: Francisco Renato dos Santos Junior
doi://10.26678/ABCM.COBEM2017.COB17-0762
Abstract
In this work it is presented a method for the prediction of the onset knock phenomenon on a spark ignition engine operating with hydrous ethanol. The method is based on the simulation of the engine, implemented in a two-zone non-dimensional model. A knock model considering multi-variable effects including pressure, temperature and octane number is formulated and calibrated with experimental data, based on an improved empirical Arrhenius model found in literature. The contents of the combustion chamber are assumed homogeneous and the energy release is modeled by Wiebe’s equations and heat loss through the walls of the cylinder is modeled by Hohenberg’s equations. Simulated results are compared with experimental data and the results showed agreement compatible with the chosen model.
Keywords
Knock prediction, Combustion, Hydrous Ethanol, Spark ignition engines
