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A Study of In-Cylinder Soot Oxidation by Laser Extinction Measurements During an EGR-Sweep in an Optical Diesel Engine

Gallo, Yann LU ; Simonsson, Johan LU ; Lind, Ted LU ; Bengtsson, Per-Erik LU ; Bladh, Henrik LU and Andersson, Öivind LU (2015) SAE World Congress and Exhibition, 2015 In SAE Technical Paper
Abstract
Two competing in-cylinder processes, soot formation and soot oxidation, govern soot emissions from diesel engines. Previous studies have shown a lack of correlation between the soot formation rate and soot emissions. The current experiment focuses on the correlation between soot oxidation rates and soot emissions. Laser extinction is measured using a red (690nm) laser beam, which is sent vertically through the cylinder. This wavelength is long enough to minimize absorption interference from poly-aromatic hydrocarbons, while still in the visible regime. It is modulated at 72 kHz in order to produce 10 pulses per crank angle degree at an engine speed of 1200 rpm. The intake oxygen concentration is varied between 9% and 21%. The time resolved... (More)
Two competing in-cylinder processes, soot formation and soot oxidation, govern soot emissions from diesel engines. Previous studies have shown a lack of correlation between the soot formation rate and soot emissions. The current experiment focuses on the correlation between soot oxidation rates and soot emissions. Laser extinction is measured using a red (690nm) laser beam, which is sent vertically through the cylinder. This wavelength is long enough to minimize absorption interference from poly-aromatic hydrocarbons, while still in the visible regime. It is modulated at 72 kHz in order to produce 10 pulses per crank angle degree at an engine speed of 1200 rpm. The intake oxygen concentration is varied between 9% and 21%. The time resolved extinction measurements are used to estimate soot oxidation rates during expansion. High-speed video imaging is used in conjunction with the laser-extinction technique to indicate the location of the sooting regions, and to assess beam steering effects. The oxidation processes are described using single exponential decay fits and an attempt to correlate them with the late cycle rate of heat release was made. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Lasers, Emission measurements, Particulate matter, Diesel engine, Compression Ignition, Combustion processes
in
SAE Technical Paper
conference name
SAE World Congress and Exhibition, 2015
external identifiers
  • scopus:84938394800
DOI
10.4271/2015-01-0800
language
English
LU publication?
yes
id
2b23047d-4378-4439-a228-1e73b8430d1b
date added to LUP
2016-11-07 16:56:56
date last changed
2017-06-11 05:09:59
@article{2b23047d-4378-4439-a228-1e73b8430d1b,
  abstract     = {Two competing in-cylinder processes, soot formation and soot oxidation, govern soot emissions from diesel engines. Previous studies have shown a lack of correlation between the soot formation rate and soot emissions. The current experiment focuses on the correlation between soot oxidation rates and soot emissions. Laser extinction is measured using a red (690nm) laser beam, which is sent vertically through the cylinder. This wavelength is long enough to minimize absorption interference from poly-aromatic hydrocarbons, while still in the visible regime. It is modulated at 72 kHz in order to produce 10 pulses per crank angle degree at an engine speed of 1200 rpm. The intake oxygen concentration is varied between 9% and 21%. The time resolved extinction measurements are used to estimate soot oxidation rates during expansion. High-speed video imaging is used in conjunction with the laser-extinction technique to indicate the location of the sooting regions, and to assess beam steering effects. The oxidation processes are described using single exponential decay fits and an attempt to correlate them with the late cycle rate of heat release was made.},
  articleno    = {2015-01-0800},
  author       = {Gallo, Yann and Simonsson, Johan and Lind, Ted and Bengtsson, Per-Erik and Bladh, Henrik and Andersson, Öivind},
  keyword      = {Lasers,Emission measurements,Particulate matter,Diesel engine,Compression Ignition,Combustion processes},
  language     = {eng},
  month        = {04},
  series       = {SAE Technical Paper},
  title        = {A Study of In-Cylinder Soot Oxidation by Laser Extinction Measurements During an EGR-Sweep in an Optical Diesel Engine},
  url          = {http://dx.doi.org/10.4271/2015-01-0800},
  year         = {2015},
}