TY - JOUR
T1 - Impacts of advanced diesel combustion operation on soot nanostructure and reactivity
AU - Yehliu, Kuen
AU - Lilik, Gregory K.
AU - Vander Wal, Randy L.
AU - Sun, Chenxi
AU - Boehman, André L.
N1 - Funding Information:
The authors wish to acknowledge the National Science Foundation for their financial support for this work under Grant #CTS-0553339 and Dr Linda Blevins and Dr Phil Westmoreland for their support and encouragement. The authors also wish to thank the National Energy Technology Laboratory for their support of this work under Instrument DE-FC25-04FT42233 and Robie Lewis for his support and guidance. The authors would also like to express thanks to the Material Research Institute of the Pennsylvania State University for providing TEM education. The authors wish to thank Vicky M. Bryg (The NCSER c/o USRA) for the TEM imaging of HECC soot samples.
Publisher Copyright:
© 2016 IMechE.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - Advanced diesel combustion, accomplished via a single pulse fuel injection and high levels of exhaust gas recirculation, is shown to be a path to reduce oxides of nitrogen and particulate matter simultaneously. This is well established in the literature. Less established is how well such dilute combustion processes influence soot formation and affect soot that is emitted from diesel engines under such combustion modes. This work focuses on characterization of the nanostructure and oxidative reactivity of soot generated by a light-duty turbodiesel engine operating under a dilute, low-temperature combustion process referred to as high-efficiency clean combustion. The high-efficiency clean combustion soot samples are shown to have a fullerenic nanostructure, characterized by high levels of tortuosity of the fringe layers as seen in transmission electron micrograph images and as quantified using an image processing algorithm. Thermogravimetric analysis of the high-efficiency clean combustion soot samples shows that they have higher rates of oxidation than soot samples from a conventional diesel combustion mode. The linkage between the nanostructure of the high-efficiency clean combustion soot samples and their oxidative reactivity reinforces and supports the structure-property relationship for soot that greater curvature on the soot nanostructure leads to significant increases in oxidative reactivity.
AB - Advanced diesel combustion, accomplished via a single pulse fuel injection and high levels of exhaust gas recirculation, is shown to be a path to reduce oxides of nitrogen and particulate matter simultaneously. This is well established in the literature. Less established is how well such dilute combustion processes influence soot formation and affect soot that is emitted from diesel engines under such combustion modes. This work focuses on characterization of the nanostructure and oxidative reactivity of soot generated by a light-duty turbodiesel engine operating under a dilute, low-temperature combustion process referred to as high-efficiency clean combustion. The high-efficiency clean combustion soot samples are shown to have a fullerenic nanostructure, characterized by high levels of tortuosity of the fringe layers as seen in transmission electron micrograph images and as quantified using an image processing algorithm. Thermogravimetric analysis of the high-efficiency clean combustion soot samples shows that they have higher rates of oxidation than soot samples from a conventional diesel combustion mode. The linkage between the nanostructure of the high-efficiency clean combustion soot samples and their oxidative reactivity reinforces and supports the structure-property relationship for soot that greater curvature on the soot nanostructure leads to significant increases in oxidative reactivity.
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U2 - 10.1177/1468087416659947
DO - 10.1177/1468087416659947
M3 - Article
AN - SCOPUS:85026637271
SN - 1468-0874
VL - 18
SP - 532
EP - 542
JO - International Journal of Engine Research
JF - International Journal of Engine Research
IS - 5-6
ER -