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Extending exhaust gas recirculation limits in diesel engines

R.M. Wagner, J.B. Green, Jr., J.M. Storey, C.S. Daw
Oak Ridge National Laboratory
Knoxville TN 37932-6472

This paper addresses the application of high exhaust gas recirculation (EGR) for reduced nitrogen oxide emissions from diesel engines. The research objective is to develop fundamental information about the relationship between EGR parameters and diesel combustion instability and particulate formation so that options can be explored for maximizing the practical EGR limit, thereby further reducing nitrogen oxide emissions while minimizing particulate formation. A wide range of instrumentation was used to acquire time-averaged emissions and particulate data as well as time-resolved combustion, emissions, and particulate data. The results of this investigation give insight into the effect of EGR level on the development of gaseous emissions as well as mechanisms responsible for increased particle density and size in the exhaust. A sharp increase in hydrocarbon emissions and particle size and density was observed at higher EGR conditions while only slight changes were observed in conventional combustion parameters such as heat release and work. Analysis of the time-resolved data is ongoing.

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Wagner RM, Green JB Jr, Storey JM, Daw CS (2000). Extending exhaust gas recirculation limits in diesel engines. 2000 Annual Conference and Exposition of the Air & Waste Management Association (Salt Lake City, Utah USA; 2000 June 18 - 22), Paper 643.
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