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Investigation of Late-Cycle Soot Oxidation Using Laser Extinction and In-Cylinder Gas Sampling at Varying Inlet Oxygen Concentrations in Diesel Engines

Gallo, Yann LU ; Malmborg, Vilhelm LU orcid ; Simonsson, Johan LU ; Svensson, Erik LU ; Shen, Mengqin LU ; Bengtsson, Per-Erik LU orcid ; Pagels, Joakim LU ; Tunér, Martin LU ; Garcia, Antonio and Andersson, Öivind LU (2017) In Fuel 193. p.308-314
Abstract
This study focuses on the relative importance of O2 and OH as oxidizers of soot during the late cycle in diesel engines, where the soot oxidation is characterized in an optically accessible engine using laser extinction measurements. These are combined with in cylinder gas sampling data from a single cylinder engine fitted with a fast gas sampling valve. Both measurements confirm that the in-cylinder soot oxidation slows down when the inlet concentration of O2 is reduced. A 38% decrease in intake O2 concentration reduces the soot oxidation rate by 83%, a non-linearity suggesting that O2 in itself is not the main soot oxidizing species. Chemical kinetics simulations of OH concentrations in the oxidation zone and estimates of the OH soot... (More)
This study focuses on the relative importance of O2 and OH as oxidizers of soot during the late cycle in diesel engines, where the soot oxidation is characterized in an optically accessible engine using laser extinction measurements. These are combined with in cylinder gas sampling data from a single cylinder engine fitted with a fast gas sampling valve. Both measurements confirm that the in-cylinder soot oxidation slows down when the inlet concentration of O2 is reduced. A 38% decrease in intake O2 concentration reduces the soot oxidation rate by 83%, a non-linearity suggesting that O2 in itself is not the main soot oxidizing species. Chemical kinetics simulations of OH concentrations in the oxidation zone and estimates of the OH soot oxidation rates point towards OH being the dominant oxidizer. (Less)
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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Soot oxidation, Particulate matter, OH, EGR, Gas sampling, Laser extinction
in
Fuel
volume
193
pages
308 - 314
publisher
Elsevier
external identifiers
  • scopus:85007482748
  • wos:000393004800032
ISSN
1873-7153
DOI
10.1016/j.fuel.2016.12.013
language
English
LU publication?
yes
id
c7817e54-c7c0-4d73-aeae-731992692795
date added to LUP
2016-11-07 17:20:53
date last changed
2025-10-14 11:01:31
@article{c7817e54-c7c0-4d73-aeae-731992692795,
  abstract     = {{This study focuses on the relative importance of O2 and OH as oxidizers of soot during the late cycle in diesel engines, where the soot oxidation is characterized in an optically accessible engine using laser extinction measurements. These are combined with in cylinder gas sampling data from a single cylinder engine fitted with a fast gas sampling valve. Both measurements confirm that the in-cylinder soot oxidation slows down when the inlet concentration of O2 is reduced. A 38% decrease in intake O2 concentration reduces the soot oxidation rate by 83%, a non-linearity suggesting that O2 in itself is not the main soot oxidizing species. Chemical kinetics simulations of OH concentrations in the oxidation zone and estimates of the OH soot oxidation rates point towards OH being the dominant oxidizer.}},
  author       = {{Gallo, Yann and Malmborg, Vilhelm and Simonsson, Johan and Svensson, Erik and Shen, Mengqin and Bengtsson, Per-Erik and Pagels, Joakim and Tunér, Martin and Garcia, Antonio and Andersson, Öivind}},
  issn         = {{1873-7153}},
  keywords     = {{Soot oxidation; Particulate matter; OH; EGR; Gas sampling; Laser extinction}},
  language     = {{eng}},
  pages        = {{308--314}},
  publisher    = {{Elsevier}},
  series       = {{Fuel}},
  title        = {{Investigation of Late-Cycle Soot Oxidation Using Laser Extinction and In-Cylinder Gas Sampling at Varying Inlet Oxygen Concentrations in Diesel Engines}},
  url          = {{http://dx.doi.org/10.1016/j.fuel.2016.12.013}},
  doi          = {{10.1016/j.fuel.2016.12.013}},
  volume       = {{193}},
  year         = {{2017}},
}