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

Book · Sun Dec 31 00:00:00 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; TRN: IM9634%%207
• Resource Relation: Conference: International fuels and lubricants meeting and exposition, Toronto (Canada), 16-19 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of Emission processes and control technologies in diesel engines. SP-1119; PB: 220 p.
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
02 PETROLEUM
DIESEL ENGINES
PERFORMANCE
AIR POLLUTION
EXHAUST GASES
RECYCLING
FUEL INJECTION SYSTEMS
ATOMIZATION
DIESEL FUELS
COMBUSTION KINETICS
FLOW VISUALIZATION
HEPTANE
IGNITION
NITROGEN OXIDES
CARBON MONOXIDE
CARBON DIOXIDE
HYDROCARBONS
EMISSION
PARTICULATES
FUEL CONSUMPTION
FLAMES
TEMPERATURE MEASUREMENT
DECANE
NAPHTHALENE
EXPERIMENTAL DATA