Influence of Injection Nozzle Hole Diameter on Highly Premixed and Low Temperature Diesel Combustion and Full Load Behavior Institut fuer Kolbenmaschinen, Karlsruhe Institute of Tech

Format:

Conference/Event

Author/Creator:

Kuhnert, Kuhnert, author.

Contributor:

Gabel, Klaus

Haas, Simon-Florian

Kutschera, Immanuel

Spicher, Ulrich

Wagner, Uwe

Conference Name:

SAE 2010 Powertrains Fuels & Lubricants Meeting (2010-10-25 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Diesel engines face difficult challenges with respect toengine-out emissions, efficiency and power density as the legalrequirements concerning emissions and fuel consumption areconstantly increasing. In general, for a diesel engine to achievelow raw emissions a well-mixed fuel-air mixture, burning at lowcombustion temperatures, is necessary. Highly premixed dieselcombustion is a feasible way to reduce the smoke emissions to verylow levels compared to conventional diesel combustion. In order toreach both, very low NOX and soot emissions, high rates of cooledEGR are necessary. With high rates of cooled EGR the NOXformation can be suppressed almost completely.This paper investigates to what extent the trade-off betweenemissions, fuel consumption and power of a diesel engine can beresolved by highly premixed and low temperature diesel combustionusing injection nozzles with reduced injection hole diameters andhigh pressure fuel injection. However, a reduced hydraulic flowrate usually leads to a penalty in fuel consumption and poweroutput at full load operation. Hence this paper also presents theinfluence of hydraulic nozzle flow on indicated power output,emissions and fuel consumption at the rated power point of theengine.Five nozzles with different hydraulic flow rates between 200 and430 cm₃ in 30 s at 100 bar are investigated. The influence of thenozzles on emission, fuel consumption, rate of heat release, andnoise are analyzed on a single-cylinder research diesel engine. Inaddition a combination of different analysis methods is used inorder to investigate the influence of hydraulic nozzle flow onmixture formation, combustion and emission in more detail. Theinfluence of injection hole diameter on hydraulic parameters of theinjector like injection rate, quantity and duration has beeninvestigated as well as the influence on spray propagation of theliquid and gaseous phase of each nozzle. In addition, aCFD-simulation shows the influence of different injection holesizes on fuel distribution, mixture formation and combustion insidethe combustion chamber during full load operation

Notes:

Vendor supplied data

Publisher Number:

2010-01-2109

Access Restriction:

Restricted for use by site license