Modeling the use of air-injection for emissions reduction in a direct-injected diesel engine

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:268138

Mather, D K; Reitz, R D ^[1]

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1. Univ. of Wisconsin, Madison, WI (United States)

This study investigates the effect of air-injection during the late combustion period produced by an air-cell on emissions from a direct injected diesel engine. The engine considered is a Caterpillar 3401 test engine which was modeled with an air-cell included as part of the piston geometry. A version of the KIVA-II code with updated submodels for diesel combustion and emissions was modified to allow for geometries with walls interior to the domain. This modified version of KIVA-II was then used to model an air-cell equipped diesel engine for four different air-cell configurations. Of the four air-cell configurations simulated, one proved successful in reducing the predicted engine emissions by more than a factor of two while simultaneously reducing NOx by a slight amount, thus moving the engine off its particulate-NOx tradeoff curve defined by varying the fuel injection timing. This air-cell configuration demonstrates that air-injection during the late combustion period can be effective at reducing engine emissions. The other three air-cell configurations simply moved the engine along its particulate-NOx tradeoff. However, this study highlights potential difficulties for designing an air-cell equipped engine. Namely, the large effect produced by the interaction of the turbulence and the in-cylinder flow in the proximity of the air-cell inlet on the overall operation of the air-cell.

• OSTI ID: 268138
• 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 ABATEMENT
COMPUTERIZED SIMULATION
DIESEL ENGINES
EXHAUST GASES
FLOW VISUALIZATION
FUEL INJECTION SYSTEMS
GAS ANALYSIS
GAS INJECTION
MATHEMATICAL MODELS
NITROGEN OXIDES
SOOT
TURBULENT FLOW