Effect of EGR on spray development, combustion and emissions in a 1.9L direct-injection diesel engine

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:268135

Arcoumanis, C; Nagwaney, A ^[1]; Hentschel, W; Ropke, S

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1. Imperial Coll. of Science, Technology and Medicine, London (United Kingdom)

The spray development, combustion and emissions in a 1.9L optical, four-cylinder, direct-injection diesel engine were investigated by means of pressure analysis, high-speed cinematography, the two-color method and exhaust gas analysis for various levels of exhaust gas recirculation (EGR), three EGR temperatures (uncontrolled, hot and cold) and three fuels (diesel, n-heptane and a two-component fuel 7D3N). Engine operating conditions included 1,000 rpm/idle and 2,000 rpm/2bar with EGR-rates ranging from 0 to 70%. Independent of rate, EGR was found to have a very small effect on spray angle and spray tip penetration but the auto-ignition sites seemed to increase in size and number at higher EGR-rates with associated reduction in the flame luminosity and flame temperature, by, say, 100K at 50% EGR. The emission tests confirmed that for different intake temperatures and three fuels, increasing the EGR-rate leads to reduced NO{sub x} and O{sub 2} levels but increased soot, CO, CO{sub 2}, and HC concentrations. Cold EGR resulted in lower NO{sub x} emissions at EGR-rates below 30% but at higher rates hot EGR seems to offer marginal improvements relative to cold EGR and significant NO{sub x} reduction compared to the uncontrolled EGR case.

• OSTI ID: 268135
• Report Number(s): CONF-9510144--; ISBN 1-56091-703-2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
33 ADVANCED PROPULSION SYSTEMS
AIR POLLUTION
ATOMIZATION
CARBON DIOXIDE
CARBON MONOXIDE
COMBUSTION KINETICS
DECANE
DIESEL ENGINES
DIESEL FUELS
EMISSION
EXHAUST GASES
EXPERIMENTAL DATA
FLAMES
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