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Heat Transfer, Knock Modeling and Cyclic Variability in a “Downsized” Spark-Ignition Turbocharged Engine

Published online by Cambridge University Press:  03 June 2015

Fabio Bozza ,
Daniela Siano  and
Michela Costa
Fabio Bozza*
Affiliation:
Universitá di Napoli “Federico II”, DIME, Via Claudio 21, 80125 Napoli, Italy
Daniela Siano*
Affiliation:
Istituto Motori-CNR, Viale Marconi 8, 80125 Napoli, Italy
Michela Costa*
Affiliation:
Istituto Motori-CNR, Viale Marconi 8, 80125 Napoli, Italy
*
Corresponding author. URL: http://boxxa.dime.unina.it/∼fbozza Email: fabio.bozza@unina.it
Email: d.siano@im.cnr.it
Email: m.costa@im.cnr.it
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Abstract

In the present paper a combined procedure for the quasi-dimensional modelling of heat transfer, combustion and knock phenomena in a “downsized” 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 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 “knock-limited” spark advance is effected and compared with experimental data. Finally, the CV effects on the occurrence of individual knocking cycles are assessed and discussed.

Keywords

76N1562P3080A2080A25Finite elements in heat transferinternal combustion engines modellingcyclic variabilityknock
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 3 , Issue 3 , June 2011 , pp. 310 - 326
Copyright
Copyright © Global-Science Press 2011

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