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Understanding the relationship between ignition delay and burn duration in a constant volume vessel at diesel engine conditions
Rabl, S. Davies, Trevor J. McDougall, A. P. Cracknell, Roger F.
Rabl, S.
Davies, Trevor J.
McDougall, A. P.
Cracknell, Roger F.
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2014-06-19
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Abstract
Experiments were performed in a constant volume vessel, with fuel sprays injected into the vessel at various
different pressure and temperature conditions chosen to represent diesel engine operation at various
loads.
A range of diesel primary reference fuels (i.e. mixtures of cetane and heptamethylnonane) of varying
cetane number (CN) were tested, and as expected lower CN fuels have longer ignition delays. Burn period
was plotted against ignition delay and two distinct trends can be seen: “mainly diffusion” diesel combustion
in which burn period decreases with ignition delay and “mainly pre-mixed” diesel combustion in which
burn period increases with ignition delay. There is typically a minimum in plots of burn period versus ignition
delay which represents the transition between the two types of combustion mode. Higher CN, higher
engine load and higher boost pressure would seem to favour “mainly diffusion” combustion whilst lower
CN, lower loads and non boosted conditions favour “mainly pre-mixed” combustion.
Citation
Rabl, S., Davies, T. J., McDougall, A. P., & Cracknell, R. F. (2015). Understanding the relationship between ignition delay and burn duration in a constant volume vessel at diesel engine conditions. Proceedings of the Combustion Institute, 35(3), 2967-2974. http://dx.doi.org/10.1016/j.proci.2014.05.054
Publisher
Elsevier
Journal
Proceedings of the Combustion Institute
Research Unit
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Type
Article
Language
en
Description
Series/Report no.
ISSN
1540-7489