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An empirical SI combustion model using laminar burning velocity correlations
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2005 (English)In: SAE transactions, ISSN 0096-736X, Vol. 114, no 4, 833-846 p.Article in journal (Refereed) Published
Abstract [en]

Predictive simulation models are needed in order to exploit the full benefits of 1-D engine simulation. Simulation model alterations such as cam phasing affect the gas composition and gas state in the cylinders and have an effect on the combustion. Modelling of these effects is particularly important when the engine is knock limited. A knock model, able to phase the combustion towards the knock limit, was previously developed by the authors. A major challenge in such knock models is to predict the pressure and temperature evolution in the end-gas accurately through an adequate combustion model. The Wiebe function is often used to model the combustion in Sl engine simulations, owing to its ease of use and computational efficiency. The Wiebe function simply imposes a curve shape for the fuel burn rate and the parameters are easily determined from calculated heat release. Detailed models of turbulent combustion also exist which require more knowledge or assumptions about combustion chamber turbulence. The combustion model proposed in this paper uses existing correlations of laminar burning velocity to predict the parameters of the Wiebe function relative to a base operating condition. The model aims at predicting combustion at high load operation. Experimental and simulation data from a gasoline fuelled 4-cylinder turbo charged port injected spark ignition engine are used to correlate the Wiebe function parameters dependence on laminar burning velocity.

Place, publisher, year, edition, pages
2005. Vol. 114, no 4, 833-846 p.
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-27214DOI: 10.4271/2005-01-2106Scopus ID: 2-s2.0-79959840667OAI: oai:DiVA.org:kth-27214DiVA: diva2:375936
Note

QC 20101209

Available from: 2010-12-09 Created: 2010-12-09 Last updated: 2016-12-14Bibliographically approved
In thesis
1. Empirical combustion modeling in SI engines
Open this publication in new window or tab >>Empirical combustion modeling in SI engines
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This licentiate thesis concerns the modeling of spark ignition engine combustion for use in one dimensional simulation tools. Modeling of knock is of particular interest when modeling turbocharged engines since knock usually limits the possible engine output at high load. The knocking sound is an acoustic phenomenon with pressure oscillations triggered by autoignition of the unburned charge ahead of the propagating flame front and it is potentially damaging to the engine. To be able to predict knock it is essential to predict the temperature and pressure in the unburned charge ahead of the flame front. Hence, an adequate combustion model is needed.

The combustion model presented here is based on established correlations of laminar burning velocity which are used to predict changes in combustion duration relative to a base operating condition. Turbulence influence is captured in empirical correlations to the engine operating parameters spark advance and engine speed. This approach makes the combustion model predictive in terms of changes in gas properties such as mixture strength, residual gas content, pressure and temperature. However, a base operating condition and calibration of the turbulence correlations is still needed when using this combustion model.

The empirical models presented in this thesis are based on extensive measurements on a turbocharged four cylinder passenger car engine. The knock model is simply a calibration of the Arrhenius type equation for ignition delay in the widely used Livengood-Wu knock integral to the particular fuel and engine used in this work.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. xii, 72 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2005:19
Keyword
spark ignited engines, combustion modeling, knock, 1D simulation, Wiebe, divided exhaust period
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-575 (URN)
Presentation
2005-09-26, B1, KTH, Brinellvägen 23, Stockholm, 13:00
Note
QC 20101209Available from: 2005-12-28 Created: 2005-12-28 Last updated: 2010-12-09Bibliographically approved

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