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Air-Entrainment in Wall-Jets Using SLIPI in a Heavy-Duty Diesel Engine

Chartier, Clement; Sjoholm, Johan; Kristensson, Elias LU ; Andersson, Oivind LU ; Richter, Mattias LU ; Johansson, Bengt LU and Alden, Marcus LU (2012) SAE 2012 International Powertrains, Fuels & Lubricants Meeting In SAE International Journal of Engines 5(4). p.1684-1692
Abstract

Mixing in wall-jets was investigated in an optical heavy-duty diesel engine with several injector configurations and injection pressures. Laser-induced fluorescence (LIF) was employed in non-reacting conditions in order to quantitatively measure local equivalence ratios in colliding wall-jets. A novel laser diagnostic technique, Structured Laser Illumination Planar Imaging (SLIPI), was successfully implemented in an optical engine and permits to differentiate LIF signal from multiply scattered light. It was used to quantitatively measure local equivalence ratio in colliding wall-jets under non-reacting conditions. Mixing phenomena in wall-jets were analyzed by comparing the equivalence ratio in the free part of the jet with that in the... (More)

Mixing in wall-jets was investigated in an optical heavy-duty diesel engine with several injector configurations and injection pressures. Laser-induced fluorescence (LIF) was employed in non-reacting conditions in order to quantitatively measure local equivalence ratios in colliding wall-jets. A novel laser diagnostic technique, Structured Laser Illumination Planar Imaging (SLIPI), was successfully implemented in an optical engine and permits to differentiate LIF signal from multiply scattered light. It was used to quantitatively measure local equivalence ratio in colliding wall-jets under non-reacting conditions. Mixing phenomena in wall-jets were analyzed by comparing the equivalence ratio in the free part of the jet with that in the recirculation zone where two wall-jets collide. These results were then compared to φ predictions for free-jets. It was found that under the conditions tested, increased injection pressure did not increase mixing in the wall-jets. Comparisons with free-jet predictions further indicated that mixing in wall-jets is less effective than in free-jets for identical conditions and downstream distances. The confined nature of the wall-jet in the optical engine is suspected to be the reason for these observations. A rapid leaning-out of the jet after end of injection was observed for all cases, but this enhanced mixing was not transmitted to the wall-jet.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
SAE International Journal of Engines
volume
5
issue
4
pages
9 pages
publisher
SAE
conference name
SAE 2012 International Powertrains, Fuels & Lubricants Meeting
conference location
Malmo, Sweden
conference dates
2012-09-18 - 2012-09-20
external identifiers
  • scopus:84899499426
ISSN
1946-3936
DOI
10.4271/2012-01-1718
language
English
LU publication?
yes
id
d6f6fa62-75a3-43ad-95a6-8abaa2207075
date added to LUP
2019-02-27 14:50:43
date last changed
2019-03-12 04:23:45
@article{d6f6fa62-75a3-43ad-95a6-8abaa2207075,
  abstract     = {<p>Mixing in wall-jets was investigated in an optical heavy-duty diesel engine with several injector configurations and injection pressures. Laser-induced fluorescence (LIF) was employed in non-reacting conditions in order to quantitatively measure local equivalence ratios in colliding wall-jets. A novel laser diagnostic technique, Structured Laser Illumination Planar Imaging (SLIPI), was successfully implemented in an optical engine and permits to differentiate LIF signal from multiply scattered light. It was used to quantitatively measure local equivalence ratio in colliding wall-jets under non-reacting conditions. Mixing phenomena in wall-jets were analyzed by comparing the equivalence ratio in the free part of the jet with that in the recirculation zone where two wall-jets collide. These results were then compared to φ predictions for free-jets. It was found that under the conditions tested, increased injection pressure did not increase mixing in the wall-jets. Comparisons with free-jet predictions further indicated that mixing in wall-jets is less effective than in free-jets for identical conditions and downstream distances. The confined nature of the wall-jet in the optical engine is suspected to be the reason for these observations. A rapid leaning-out of the jet after end of injection was observed for all cases, but this enhanced mixing was not transmitted to the wall-jet.</p>},
  articleno    = {2012-01-1718},
  author       = {Chartier, Clement and Sjoholm, Johan and Kristensson, Elias and Andersson, Oivind and Richter, Mattias and Johansson, Bengt and Alden, Marcus},
  issn         = {1946-3936},
  language     = {eng},
  location     = {Malmo, Sweden},
  month        = {09},
  number       = {4},
  pages        = {1684--1692},
  publisher    = {SAE},
  series       = {SAE International Journal of Engines},
  title        = {Air-Entrainment in Wall-Jets Using SLIPI in a Heavy-Duty Diesel Engine},
  url          = {http://dx.doi.org/10.4271/2012-01-1718},
  volume       = {5},
  year         = {2012},
}