Engine-out NOx emissions from diesel engines continue to be a major topic of research interest. While substantial understanding has been obtained of engine-out (i.e. before any aftertreatment) NOx formation and reduction techniques, not least EGR which is now well established and fitted to production vehicles, much less data are available on cycle resolved NOx emissions. In this work, crank-angle resolved NO and NOx measurements have been taken from a high-speed light duty diesel engine at test conditions both with and without EGR. These have been combined with 1D data of exhaust flow and this used to form a mass average of NO and NOx emissions per cycle. These results have been compared with combustion data and other emissions. The results show that there is a very strong correlation (R2 > 0.95) between the NOx emitted per cycle and the peak cylinder pressure of that cycle. In addition, the crank-angle resolved NO and NOx measurements also reveal that there is a difference in NO : NO2 ratio (where NO2 is assumed to be the difference between NO and NOx) during the exhaust period, with proportionally more NO2 being emitted during the blowdown period compared to the rest of the exhaust stroke.
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ASME 2018 Internal Combustion Engine Division Fall Technical Conference
November 4–7, 2018
San Diego, California, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5198-2
PROCEEDINGS PAPER
Cycle-to-Cycle NO and NOx Emissions From a HSDI Diesel Engine
Mark Peckham
Mark Peckham
Cambustion, Cambridge, UK
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Felix Leach
University of Oxford, Oxford, UK
Martin Davy
University of Oxford, Oxford, UK
Mark Peckham
Cambustion, Cambridge, UK
Paper No:
ICEF2018-9772, V001T03A033; 9 pages
Published Online:
January 3, 2019
Citation
Leach, F, Davy, M, & Peckham, M. "Cycle-to-Cycle NO and NOx Emissions From a HSDI Diesel Engine." Proceedings of the ASME 2018 Internal Combustion Engine Division Fall Technical Conference. Volume 1: Large Bore Engines; Fuels; Advanced Combustion. San Diego, California, USA. November 4–7, 2018. V001T03A033. ASME. https://doi.org/10.1115/ICEF2018-9772
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