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Parameters Influencing Soot Oxidation Rates in an Optical Diesel Engine

Gallo, Yann LU ; Li, Zheming LU ; Richter, Mattias LU and Andersson, Öivind LU (2016) In SAE International Journal of Engines 9(4).
Abstract
Soot emissions from diesel engines are the net result of two competing processes: soot formation and soot oxidation. Previous studies have shown poor correlation between soot formation rates and the soot emissions. This article presents a systematic study of a number of parameters affecting soot oxidation rate and how it correlates with the soot emissions. An optical heavy-duty engine is used in conjunction with a laser extinction setup in order to collect time resolved data of the soot concentration in the cylinder during the expansion stroke. Laser extinction is measured using a red (685 nm) laser beam, which is sent vertically through the cylinder and modulated to produce 10 pulses per crank angle degree. Information is obtained about... (More)
Soot emissions from diesel engines are the net result of two competing processes: soot formation and soot oxidation. Previous studies have shown poor correlation between soot formation rates and the soot emissions. This article presents a systematic study of a number of parameters affecting soot oxidation rate and how it correlates with the soot emissions. An optical heavy-duty engine is used in conjunction with a laser extinction setup in order to collect time resolved data of the soot concentration in the cylinder during the expansion stroke. Laser extinction is measured using a red (685 nm) laser beam, which is sent vertically through the cylinder and modulated to produce 10 pulses per crank angle degree. Information is obtained about the amount of soot formed and the soot oxidation rate. The parameters studied are the motored density at top dead center (TDC), motored temperature at TDC, injection pressure, engine speed, swirl level and injector orifice diameter. A central composite design is employed to assess the importance of the parameters as well as identifying potential interaction effects. A single exponential decay function is fit to the extinction data to describe the oxidation process and the half-life of the decay is used as a measure of the oxidation rate. The half-lives are compared with engine out emissions and the importance of each parameter is studied using regression analysis. The results suggest that the injection pressure has the strongest effect on the late-cycle soot oxidation rate, while the temperature at TDC has the weakest effect of the parameters studied. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Particulate matter, Compression Ignition, Combustion processes, Diesel engines
in
SAE International Journal of Engines
volume
9
issue
4
publisher
SAE
external identifiers
  • wos:000390597200006
ISSN
1946-3944
DOI
10.4271/2016-01-2183
language
English
LU publication?
yes
id
80e9de99-77f8-4a8a-81c5-e6f9e8b24321
date added to LUP
2016-11-07 16:40:03
date last changed
2017-09-18 11:29:29
@article{80e9de99-77f8-4a8a-81c5-e6f9e8b24321,
  abstract     = {Soot emissions from diesel engines are the net result of two competing processes: soot formation and soot oxidation. Previous studies have shown poor correlation between soot formation rates and the soot emissions. This article presents a systematic study of a number of parameters affecting soot oxidation rate and how it correlates with the soot emissions. An optical heavy-duty engine is used in conjunction with a laser extinction setup in order to collect time resolved data of the soot concentration in the cylinder during the expansion stroke. Laser extinction is measured using a red (685 nm) laser beam, which is sent vertically through the cylinder and modulated to produce 10 pulses per crank angle degree. Information is obtained about the amount of soot formed and the soot oxidation rate. The parameters studied are the motored density at top dead center (TDC), motored temperature at TDC, injection pressure, engine speed, swirl level and injector orifice diameter. A central composite design is employed to assess the importance of the parameters as well as identifying potential interaction effects. A single exponential decay function is fit to the extinction data to describe the oxidation process and the half-life of the decay is used as a measure of the oxidation rate. The half-lives are compared with engine out emissions and the importance of each parameter is studied using regression analysis. The results suggest that the injection pressure has the strongest effect on the late-cycle soot oxidation rate, while the temperature at TDC has the weakest effect of the parameters studied.},
  articleno    = {2016-01-2183},
  author       = {Gallo, Yann and Li, Zheming and Richter, Mattias and Andersson, Öivind},
  issn         = {1946-3944},
  keyword      = {Particulate matter,Compression Ignition,Combustion processes,Diesel engines},
  language     = {eng},
  month        = {10},
  number       = {4},
  publisher    = {SAE},
  series       = {SAE International Journal of Engines},
  title        = {Parameters Influencing Soot Oxidation Rates in an Optical Diesel Engine},
  url          = {http://dx.doi.org/10.4271/2016-01-2183},
  volume       = {9},
  year         = {2016},
}