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Investigations on PN formation and emission from passenger car GDI engines

Notheis, Denis; Bertsch, Markus; Velji, Amin; Koch, Thomas

Abstract:
To meet the future CO2 limits, several engine manufactures increase their proportion of gasoline engines equipped with direct injection systems (GDI). However particle number emissions of GDI engines is much higher than of port fuel injection (PFI) engines. Reasons for particle emissions are nonhomogeneous mixture formation, the presence of local rich zones and liquid fuel in the combustion chamber [1; 2]. Downsizing and Downspeeding are promising solutions to reduce the fuel consumption. In context with the new emissions regulations the reduction of particle number emissions at high engine loads is becoming increasingly important. The higher engine loads at lower engine speeds lead to more fuel injection in a lower in-cylinder charge motion environment. Both are negative for the mixture formation and the evaporation of the liquid fuel.

In previous work, a single cylinder research engine was operated to measure the particle number emissions at high engine loads [3]. In this work, a CFD-Model was used to analyze the mixture formation process. Therefore, a cold simulation was performed up to the point of ignition. The CFD simulations provide an insight into the mixture formation process, the fuel evaporation process and the creation of liquid film in the combustion chamber. ... mehr



Originalveröffentlichung
DOI: 10.1007/978-3-658-21194-3_78
Zugehörige Institution(en) am KIT Institut für Kolbenmaschinen (IFKM)
Publikationstyp Buchaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISBN: 978-3-658-21193-6
ISSN: 2198-7432, 2198-7440
KITopen-ID: 1000098726
Erschienen in 18. Internationales Stuttgarter Symposium: Automobil- und Motorentechnik. Ed.: M. Bargende
Verlag Springer Fachmedien Wiesbaden, Wiesbaden
Seiten 1041–1055
Serie Proceedings
Vorab online veröffentlicht am 12.05.2018
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