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Validation of a Simplified Model for Combustion and Emission Formation in Diesel Engines Based on Correlations for Spray Penetration and Dispersion, Gas Entrainment into Sprays and Flame Lift-off
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
2010 (English)In: International Powertrains, Fuels & Lubricants Meeting, 2010, no 01-1494Conference paper, Published paper (Refereed)
Abstract [en]

A simplified combustion and emission formation model for diesel engines has been developed in a project where the long term objective is to predict emissions during transient operation. The intended application implies that the final model must be both computationally inexpensive and comprehensive so that it can be used for optimization of engine control variables when coupled to full-engine simulation software. As starting point, the proposed model uses diesel spray correlations established in combustion vessels regarding spray penetration, dispersion, gas entrainment, ignition and flame lift-off. It has been found that with minor adaption, these correlations are valid also for combustion in an engine. By assuming a fully mixing controlled combustion after ignition and by use of simplified emission models, the correlations have been found useful for predicting trends in engine-out emission with low computational cost. Besides engine-out emissions and pressure analysis, endoscope instrumentation has been used to provide validation data regarding maximum in-cylinder temperature and soot concentration.

Place, publisher, year, edition, pages
2010. no 01-1494
Identifiers
URN: urn:nbn:se:kth:diva-33283DOI: 10.4271/2010-01-1494Scopus ID: 2-s2.0-84877183756OAI: oai:DiVA.org:kth-33283DiVA: diva2:414104
Conference
International Powertrains, Fuels & Lubricants Meeting, May 2010, Rio De Janeiro, BRAZI, Session: Modeling of SI and CI Engines
Note
QC 20110502Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2011-05-02Bibliographically approved
In thesis
1. Simplified models for emission formation in diesel engines during transient operation
Open this publication in new window or tab >>Simplified models for emission formation in diesel engines during transient operation
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work presented in this thesis is the result of the KTH CICERO project “Dynamic Engine Performance” in which the main objective was to develop simple models foremission formation. The demand for such models is increasing, mainly due to the tightening emission legislation for diesel engines which has lead to more complex engines and thereby more laborious development and calibration processes. Simple emission models can be a valuable tool during the development phase, e.g. when used with models for gas exchange - and after-treatment systems, and for precalibration of the engine control settings. Since engines in automotive application typically work under dynamic load, the main prerequisites were that the models should be comprehensive enough to handle the extreme conditions that can occur in engines during load transients but still simple enough to be used for calibration.

Two main approaches have been used; one where the combustion and emission formation processes were modeled from the flame front and downstream using equilibrium chemistry. In the other approach, the entire mixing/entrainment process was modeled and emission formation was modeled with kinetic chemistry. Both approaches were found to meet the requirements but had different advantages; the first, simpler approach had shorter calculation time while the latter was more comprehensive and required less tuning. The latter also resulted in a model for heat release rate which can be useful as a stand-alone model and allows the emission models to be used for untested conditions.

Another objective in this project was to identify techniques/instruments that can be used for emission measurements during transient operation since these are essential for understanding of emission formation in these conditions and as validation data for the emission models.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 49 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2011:06
Keyword
Diesel engine, emission modeling, transient operation, NOx, Soot
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-33292 (URN)978-91-7415-949-3 (ISBN)
Public defence
2011-05-06, Sal F3, Lindstedtsvägen 26, Lindstedtsvägen 26, KTH, Stockholm, 15:21 (English)
Opponent
Supervisors
Note
QC 20110502Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2011-06-13Bibliographically approved

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