Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-24T06:50:22.742Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Email: [email protected]
Email: [email protected]
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Sawamoto, K., Kawamura, Y., KITA, T., and Matsushita, K., Individual cylinder knock control by detecting cylinder pressure, SAE Paper 871911, 1987.Google Scholar
[2] Litak, G., Kaminski, T., Czarnigowski, J., Grzegorz, A. K., and Wendeker, G. M., Combustion process in a spark ignition engine: analysis of cyclic peak pressure and peak pressure angle oscillations, Meccanica., 44 (2009), pp. 1–11.Google Scholar
[3] Galloni, E., Analyses about parameters that affect cyclic variation in a spark ignition engine, Appl. Thermal. Eng., 29 (2009), pp. 1131–1137.CrossRefGoogle Scholar
[4] Heywood, J. B., Internal Combustion Engine Fundamentals, McGraw-Hill Int. editions, 1988.Google Scholar
[5] Bozza, F., and Torella, E., The employment of a 1D simulation model for the A/F ratio control in a VVT engine, SAE Paper 2003-01-0027, also in SAE Transactions, J. Eng., 112 (2004), pp. 124–134.Google Scholar
[6] Bozza, F., Gimelli, A., Siano, D., Torella, E., and Mastrangelo, G., A quasi-dimensional three-zone model for performance and combustion noise evaluation of a twin-spark High-EGR engine, SAE 2004 Transactions, J. Eng., 113 (2005), pp. 491–501.Google Scholar
[7] Bozza, F., Gimelli, A., Merola, S. S., and Vaglieco, B. M., Validation of a fractal combustion model through flame imaging, SAE 2005 Transactions, J. Eng., 114 (2006), pp. 973– 987.Google Scholar
[8] Poulos, S. G., and Heywood, J. B., The effect of chamber geometry on spark-ignition engine combustion, SAE Paper 830334, 1983.Google Scholar
[9] Bozza, F., Fontana, G., Galloni, E., and Torella, E., 3D-1D analyses of the turbulent flow field, burning speed and knock occurrence in a turbocharged SI engine, SAE Transactions, J. Eng., 116 (2008), pp. 1495–1507.Google Scholar
[10] GT-Power, User’s Manual and Tutorial, GT-SUITETM Version 6.1, Gamma Technologies.Google Scholar
[11] Hu, H., and Keck, J., Autoignition of adiabatically compressed combustible gas mixtures, SAE Paper 872110, 1987.Google Scholar
[12] Keck, J., and Hu, H., Explosions of adiabatically compressed gases in a constant volume bomb, 21st International Symposium on Combustion, The Combustion Institute, 1986, pp. 521–529.Google Scholar
[13] Tanaka, S., Ayala, F., and Keck, J., A reduced chemical kinetic model for HCCI combustion of primary reference fuels, Combust. Flame., 132 (2003), pp. 219–239.Google Scholar
[14] Ayala, F. A., and Heywood, J. B., Lean SI engines: the role of combustion variability in defining lean limits, SAE Paper 2007-24-0030.CrossRefGoogle Scholar
[15] Torregrosa, A. J., Broatch, A., Martin, J., and Monelletta, L., Combustion noise level assessment in direct injection diesel engines by means of in-cylinder pressure components, Meas. Sci. Tech., 18 (2007), pp. 2131–2142.CrossRefGoogle Scholar
[16] Payri, F., Broatch, A., Tormos, B., and Marant, V., New methodology for in-cylinder pressure analysis in direct injection diesel engines-application to combustion noise, Meas. Sci. Tech., 16 (2005), pp. 540–547.Google Scholar
[17] Hudson, C., Gao, X., and Stone, R., Knock measurement for fuel evaluation in spark ignition engines, Fuel., 80 (2001), pp. 395–407.Google Scholar
[18] Samimy, H., and Rizzoni, G., Mechanical signature analysis using time-frequency signal processing: application to internal combustion engine knock detection, Proceedings of the IEEE, 84(9) (1996), pp. 1330–1343.Google Scholar
[19] Vermorel, O., Richard, S., Colin, O., Angelberger, C., Benkenida, A., and Vey-Nante, D., Towards the understanding of cyclic variability in a spark ignited engine using multicycle LES, Combust. Flame., 156(8) (2009), pp. 1525–1541.Google Scholar