Recent four valve HSDI Diesel engines are able to controlthe swirl intensity, in order to enhance the in-cylinder flowfield at partial load without decreasing breathing capabilities atfull load.Making reference to a current production engine, thepurpose of this paper is to investigate the influence of portdesign and flow-control strategies on both engine permeabilityand in-cylinder flow field.Using previously validated models, 3-D CFD simulationsof the intake and compression strokes are performed in orderto predict the in-cylinder flow patterns originated by thedifferent configurations.The comparison between the two configurations in termsof airflow at full load indicates that Geometry 2 can trap3.03% more air than Geometry 1, while the swirl intensity atIVC is reduced (-30%).The closure of one intake valve (the left one) is veryeffective to enhance the swirl intensity at partial load: theSwirl Ratio at IVC passes from 0.7 to 2.6 for Geometry 1,while for Geometry 2 it varies from 0.4 to 2.9.

Numerical Analysis of Swirl Control Strategies in a Four Valve HSDI Diesel Engine / Fontanesi, Stefano; Mattarelli, Enrico; Montorsi, Luca. - ELETTRONICO. - (2004), pp. 1-12. ((Intervento presentato al convegno ASME Internal Combustion Engine Division 2004 Fall Technical Conference ICEF2004 tenutosi a Long Beach (USA) nel Ottobre 2004 [10.1115/ICEF2004-0909].

Numerical Analysis of Swirl Control Strategies in a Four Valve HSDI Diesel Engine

FONTANESI, Stefano;MATTARELLI, Enrico;MONTORSI, Luca
2004

Abstract

Recent four valve HSDI Diesel engines are able to controlthe swirl intensity, in order to enhance the in-cylinder flowfield at partial load without decreasing breathing capabilities atfull load.Making reference to a current production engine, thepurpose of this paper is to investigate the influence of portdesign and flow-control strategies on both engine permeabilityand in-cylinder flow field.Using previously validated models, 3-D CFD simulationsof the intake and compression strokes are performed in orderto predict the in-cylinder flow patterns originated by thedifferent configurations.The comparison between the two configurations in termsof airflow at full load indicates that Geometry 2 can trap3.03% more air than Geometry 1, while the swirl intensity atIVC is reduced (-30%).The closure of one intake valve (the left one) is veryeffective to enhance the swirl intensity at partial load: theSwirl Ratio at IVC passes from 0.7 to 2.6 for Geometry 1,while for Geometry 2 it varies from 0.4 to 2.9.
ASME Internal Combustion Engine Division 2004 Fall Technical Conference ICEF2004
Long Beach (USA)
Ottobre 2004
1
12
Fontanesi, Stefano; Mattarelli, Enrico; Montorsi, Luca
Numerical Analysis of Swirl Control Strategies in a Four Valve HSDI Diesel Engine / Fontanesi, Stefano; Mattarelli, Enrico; Montorsi, Luca. - ELETTRONICO. - (2004), pp. 1-12. ((Intervento presentato al convegno ASME Internal Combustion Engine Division 2004 Fall Technical Conference ICEF2004 tenutosi a Long Beach (USA) nel Ottobre 2004 [10.1115/ICEF2004-0909].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/605471
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