@Article{AAMM-3-310,
author = {Bozza , FabioSiano , Daniela and Costa , Michela},
title = {Heat Transfer, Knock Modeling and Cyclic Variability in a "Downsized" Spark-Ignition Turbocharged Engine},
journal = {Advances in Applied Mathematics and Mechanics},
year = {2011},
volume = {3},
number = {3},
pages = {310--326},
abstract = {<p style="text-align: justify;">In the present paper a combined procedure for the quasi-dimensional modelling
of heat transfer, combustion and knock phenomena in a &quot;downsized&quot; Spark Ignition
two-cylinder turbocharged engine is presented. The procedure is extended to also
include the effects consequent the Cyclic Variability. Heat transfer is modelled
by means of a Finite Elements model. Combustion simulation is based on a fractal
description of the flame front area. Cyclic Variability (CV) is characterized through
the introduction of a random variation on a number of parameters controlling the
rate of heat release (air/fuel ratio, initial flame kernel duration and radius,
laminar flame speed, turbulence intensity). The intensity of the random variation
is specified in order to realize a Coefficient Of Variation (COV) of the &nbsp;Indicated
Mean Effective Pressure (IMEP) similar to the one measured during an experimental
campaign. Moreover, the relative importance of the various concurring effects is
established on the overall COV. A kinetic scheme is then solved within the unburned
gas zone, characterized by different thermodynamic conditions occurring cycle-by-cycle.
In this way, an optimal choice of the &quot;knock-limited&quot; spark advance is effected and
compared with experimental data. Finally, the CV effects on the occurrence of
individual knocking cycles are assessed and discussed.</p>},
issn = {2075-1354},
doi = {https://doi.org/10.4208/aamm.10-10s2-04},
url = {http://global-sci.org/intro/article_detail/aamm/171.html}
}