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Evidence for supercritical mixing layers in the ECN Spray A

Falgout, Zachary; Rahm, Mattias; Wang, Zhenkan LU and Linne, Mark (2015) In Proceedings of the Combustion Institute 35(2). p.1579-1586
Abstract
Prior work on an engine combustion network Diesel fuel injector led to the conclusion that under Diesel engine conditions (combustion chamber pressure and temperature) the jet was transitionally supercritical; meaning that the core of the jet would be condensed liquid while the edge of the jet would be supercritical. We report initial experiments aimed at observing the thickened turbulent mixing layer that would result if the jet were transitionally supercritical. We have applied ballistic imaging to the same Diesel fuel injector, under similar conditions, and we find that the images do indicate a structural change when going from subcritical to supercritical conditions. Under subcritical conditions we observe a well-defined liquid/gas... (More)
Prior work on an engine combustion network Diesel fuel injector led to the conclusion that under Diesel engine conditions (combustion chamber pressure and temperature) the jet was transitionally supercritical; meaning that the core of the jet would be condensed liquid while the edge of the jet would be supercritical. We report initial experiments aimed at observing the thickened turbulent mixing layer that would result if the jet were transitionally supercritical. We have applied ballistic imaging to the same Diesel fuel injector, under similar conditions, and we find that the images do indicate a structural change when going from subcritical to supercritical conditions. Under subcritical conditions we observe a well-defined liquid/gas interface, surface wave structure, and formation of ligaments and voids. Under supercritical conditions the interface transitions into a continuous, turbulent mixing layer. Images of this layer include the cellular structure characteristic of gas jets. These changes are consistent with experimental literature on cryogenic supercritical jets and with DNS modeling of supercritical mixing layers. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ballistic imaging, Sprays, Supercritical
in
Proceedings of the Combustion Institute
volume
35
issue
2
pages
1579 - 1586
publisher
Elsevier
external identifiers
  • wos:000348048800050
  • scopus:84964203006
ISSN
1540-7489
DOI
10.1016/j.proci.2014.06.109
language
English
LU publication?
yes
id
f819a6c2-90e8-4617-9d45-b07e01727961 (old id 4917509)
date added to LUP
2015-03-25 14:48:22
date last changed
2017-09-17 03:45:06
@article{f819a6c2-90e8-4617-9d45-b07e01727961,
  abstract     = {Prior work on an engine combustion network Diesel fuel injector led to the conclusion that under Diesel engine conditions (combustion chamber pressure and temperature) the jet was transitionally supercritical; meaning that the core of the jet would be condensed liquid while the edge of the jet would be supercritical. We report initial experiments aimed at observing the thickened turbulent mixing layer that would result if the jet were transitionally supercritical. We have applied ballistic imaging to the same Diesel fuel injector, under similar conditions, and we find that the images do indicate a structural change when going from subcritical to supercritical conditions. Under subcritical conditions we observe a well-defined liquid/gas interface, surface wave structure, and formation of ligaments and voids. Under supercritical conditions the interface transitions into a continuous, turbulent mixing layer. Images of this layer include the cellular structure characteristic of gas jets. These changes are consistent with experimental literature on cryogenic supercritical jets and with DNS modeling of supercritical mixing layers.},
  author       = {Falgout, Zachary and Rahm, Mattias and Wang, Zhenkan and Linne, Mark},
  issn         = {1540-7489},
  keyword      = {Ballistic imaging,Sprays,Supercritical},
  language     = {eng},
  number       = {2},
  pages        = {1579--1586},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute},
  title        = {Evidence for supercritical mixing layers in the ECN Spray A},
  url          = {http://dx.doi.org/10.1016/j.proci.2014.06.109},
  volume       = {35},
  year         = {2015},
}