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Influence of jet-jet interactions on the lift-off length in an optical heavy-duty DI diesel engine

Chartier, Clement LU ; Aronsson, Ulf LU ; Andersson, Öivind LU ; Egnell, Rolf LU and Johansson, Bengt LU (2013) In Fuel 112. p.311-318
Abstract
Several investigations have reported that the lift-off length on diesel jets depends strongly on the ambient temperature. The spacing between adjacent jets is thereby expected to influence the lift-off length, as it affects the amount of hot, burned gases present between the jets. Measurements on an 8-hole nozzle in an optical diesel engine showed that the lift-off length can be transient at all times between the start and end of injection. This is attributed to varying in-cylinder temperature and especially to the presence of hot combustion products in the gases entrained into the jets. The effect of inter-jet angle on lift-off length was investigated using symmetric and asymmetric nozzle cups. Decreasing the inter-jet angle produces... (More)
Several investigations have reported that the lift-off length on diesel jets depends strongly on the ambient temperature. The spacing between adjacent jets is thereby expected to influence the lift-off length, as it affects the amount of hot, burned gases present between the jets. Measurements on an 8-hole nozzle in an optical diesel engine showed that the lift-off length can be transient at all times between the start and end of injection. This is attributed to varying in-cylinder temperature and especially to the presence of hot combustion products in the gases entrained into the jets. The effect of inter-jet angle on lift-off length was investigated using symmetric and asymmetric nozzle cups. Decreasing the inter-jet angle produces shorter lift-off length. The lift-off length showed a weaker dependence on the ambient temperature in the engine than predicted by an empirical expression established in a constant-volume combustion vessel. These findings indicate that experiments in such vessels may not capture all features of the conditions in engines. The lift-off length tended to be 15% shorter on the downswirl (leeward) side of the jet. A strong interaction between the effects of the inter-jet spacing and the inlet temperature on the lift-off length was found. All these effects are attributed to the presence of hot gases between the jets. (C) 2013 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Lift-off length, Jet-jet interactions, Optical engine, Diesel, Sprays
in
Fuel
volume
112
pages
311 - 318
publisher
Elsevier
external identifiers
  • wos:000321735400039
  • scopus:84879081914
ISSN
1873-7153
DOI
10.1016/j.fuel.2013.05.021
language
English
LU publication?
yes
id
ced37465-a75d-49ce-9edf-17b3766028d5 (old id 3973192)
date added to LUP
2013-08-21 09:39:38
date last changed
2019-08-28 02:34:02
@article{ced37465-a75d-49ce-9edf-17b3766028d5,
  abstract     = {Several investigations have reported that the lift-off length on diesel jets depends strongly on the ambient temperature. The spacing between adjacent jets is thereby expected to influence the lift-off length, as it affects the amount of hot, burned gases present between the jets. Measurements on an 8-hole nozzle in an optical diesel engine showed that the lift-off length can be transient at all times between the start and end of injection. This is attributed to varying in-cylinder temperature and especially to the presence of hot combustion products in the gases entrained into the jets. The effect of inter-jet angle on lift-off length was investigated using symmetric and asymmetric nozzle cups. Decreasing the inter-jet angle produces shorter lift-off length. The lift-off length showed a weaker dependence on the ambient temperature in the engine than predicted by an empirical expression established in a constant-volume combustion vessel. These findings indicate that experiments in such vessels may not capture all features of the conditions in engines. The lift-off length tended to be 15% shorter on the downswirl (leeward) side of the jet. A strong interaction between the effects of the inter-jet spacing and the inlet temperature on the lift-off length was found. All these effects are attributed to the presence of hot gases between the jets. (C) 2013 Elsevier Ltd. All rights reserved.},
  author       = {Chartier, Clement and Aronsson, Ulf and Andersson, Öivind and Egnell, Rolf and Johansson, Bengt},
  issn         = {1873-7153},
  keyword      = {Lift-off length,Jet-jet interactions,Optical engine,Diesel,Sprays},
  language     = {eng},
  pages        = {311--318},
  publisher    = {Elsevier},
  series       = {Fuel},
  title        = {Influence of jet-jet interactions on the lift-off length in an optical heavy-duty DI diesel engine},
  url          = {http://dx.doi.org/10.1016/j.fuel.2013.05.021},
  volume       = {112},
  year         = {2013},
}