Temporal soot evolution and diesel engine combustion: Influence of fuel composition,injection parameters,and exhaust gas recirculation

Abstract

This study deals with the investigation of the influence of fuel composition, injection parameters, and exhaust gas recirculation on not only engine-out, NO_x, and particulate matter (PM) emissions but also on the temporal behaviour of soot formation and oxidation during combustion. Based on accurate measurements of exhaust emissions (gaseous components, particle number, and size distributions), in-cylinder temporal evolution of soot and temperature (computed from multicolour-pyrometry data), and analysis of the relevant parameters in direct-injection diesel engine combustion (calculation of heat release rates and different zone temperatures in the cylinder), insight has been gained with respect to the underlying mechanisms of the observed effects. Crank-angle-resolved data of the in-cylinder soot concentration have revealed the positive influence of the addition of water or of oxygenated diesel additives in diesel fuel in terms of reducing the soot formation and enhancing the soot oxidation rate. A clear linear correlation was found between the filter smoke number and KL signal at the end of the oxidation process. With respect to the particulate number or mass an exponential fit with KL at the end of main oxidation is shown.

Keywords

direct-injection diesel engine soot emissions particulates two-colour pyrometry fuel composition

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References

Dec

Soot distribution in a DI diesel engine using 2-D imaging of laser-induced incandescence, elastic scattering, and flame luminosity

SAE paper 920115, 1992.

Schubiger

Untersuchungen zur Russbildung und -oxidation in der dieselmotorischen Verbrennung: Thermodynamische Kenngrössen, Verbrennungs-analyse und Mehrfarbenendoskopie. Dissertation Thesis 14445, Eidgenössiche Technische Hochschule Zürich, 2001.

Bertola

Technologies for lowest NO_x and particulate emissions in Dl-diesel engine combustion -influence of injection parameters, EGR and fuel composition. Dissertation Thesis 15373, Eidgenössiche Technische Hochschule Zürich, 2003.

Ogava

Nabi

M. N.

Minami

Miyamoto

Ultra low emissions and high performance diesel combustion with a combination of high EGR, three-way catalyst, and a highly oxygenated fuel, di-methoxy methane (DMM)

SAE technical paper 2000-01-1819, 2000.

Kunte

Untersuchungen zum Einfluss von Brennstoffstruktur und -sauerstoffgehalt auf die Russbildung und -oxidation in laminaren Diffusionsflammen. Dissertation Thesis 15003, Eidgenössiche Technische Hochschule Zürich, 2003.

Kitamura

Ito

Senda

Fujimoto

Mechanism of smokeless diesel combustion with oxygenated fuels based on the dependence of the equivalence ratio and temperature on soot particle formation

Int. J. Engine Res. 2002, 3(4), 223–248.

Park

J. W.

Huh

K. Y.

Park

K. H.

Experimental study on the combustion characteristics of emulsified diesel in a rapid compression and expansion machine

Proc. Instn Mech. Engrs, Part D: J. Automobile Engineering 2000, 214(D3), 579–586.

Bertola

Boulouchos

Influence of water-diesel fuel emulsions and EGR on combustion and emissions of heavy duty Dl-diesel engines equipped with common-rail fuel injection system In SAE Special Publication SP-1802, Diesel particulate systems, engines and components, and engine performance additives, pp. 32–44, SAE paper 2003-01-3146, 2003.

10.

Bertola

Schubiger

Kasper

Matter

Forss

A. M.

Mohr

Boulouchos

Lutz

Characterization of diesel particulate emissions in heavy-duty Dl-diesel engines with common-rail fuel injection - influence of injection parameters and fuel composition In SAE Special Publication SP-1715, Diesel and particulate emissions, pp. 9–21, SAE Paper 2001–01-3573, 2001; also in SAE Trans. J. Fuels Lubricants, 2001, 1925–1937.

11.

Mathis

Mohr

Kaegi

Bertola

Boulouchos

Influence of diesel engine combustion parameters on primary soot particle diameter Submitted article to Environ. Sci. Technol., 2005, 39(6), 1887–1892.

12.

Schubiger

Boulouchos

Eberle

M. K.

Soot emissions from diesel combustion

MTZ Worldwide 2002, 5, 2–5.

13.

Obrecht

WEG-Rechenprogramm zur Berechnung des Wärmeentwicklungs-gesetzes aus gemessenen Brennraumdruckverläufen von Diesel- und Otto-motoren, 1995, revised 2003 (Laboratorium für Verbrennungsmotoren und Verbrennungstechnik (LVV), Eidgenössiche Technische Hochschule Zürich, Zürich).

14.

Ladommatos

Zhao

A guide to measurement of flame temperature and soot concentration in diesel engines using the two-colour method -Part 1: Principles

SAE paper 941956, 1994.

15.

Ladommatos

Zhao

A guide to measurement of flame temperature and soot concentration in diesel engines using the two-colour method - Part 2: Implementation

SAE paper 941957, 1994.

16.

Zhao

Ladommatos

Optical diagnostics for soot and temperature measurement in diesel engines

Prog. Energy Combust. Sci., 1998, 221–255.

17.

Zhao

Ladommatos

Optical diagnostics for in-cylinder mixture formation measurements in IC engines

Prog. Energy Combust. Sci., 1998, 297–336.

18.

Yan

Borman

G. L.

Analysis and in-cylinder measurement of particulate radiant emissions and temperature in a direct-injection diesel engine

SAE paper 881315, 1988.

19.

Gstrein

Ein Beitragzur spektroskopischen Flammentemperaturmessung bei Dieselmotoren. Dissertation Thesis, Universität Graz, 1986.

20.

Heywood

Internal combustion engines fundamentals, 1998 (McGraw-Hill, New York).

21.

Mayer

Pyrometrische Untersuchung der Verbrennung in Motoren mit Common-Rail-Direkt-einspritzung mittels einer erweiterten Zwei-Farben-Methode

Forschungsberichte aus dem Institut für Kolbenmaschinen der Uni Karlsruhe, 2000.