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Optical Diagnostics of Hcci and Low-Temperature Diesel Using Simultaneous 2-D Plif of Oh and Formaldehyde

Hildingsson, Leif LU ; Persson, Håkan LU ; Johansson, Bengt LU ; Collin, Robert LU ; Nygren, Jenny LU ; Richter, Mattias LU ; Aldén, Marcus LU ; Hasegawa, Ryo and Yanagihara, Hiromichi (2004) In SAE Technical Paper 2004-01-2949
Abstract
Simultaneous OH- and formaldehyde planar-LIF measurements have been performed in an optical engine using two laser sources working on 283 and 355 nm, respectively. The engine used for the measurements was a car diesel engine converted to single-cylinder operation and modified for optical access. The fuel, n-heptane, was injected by a direct injection common-rail system and the engine was also fitted with an EGR system.



The engine was operated in both HCCI mode and diesel mode. Due to the low load, the diesel mode resulted in low-temperature diesel combustion and because of limitations in maximum pressure and maximum rate of pressure increase of the optical engine, the diesel mode was run at a higher EGR percentage than... (More)
Simultaneous OH- and formaldehyde planar-LIF measurements have been performed in an optical engine using two laser sources working on 283 and 355 nm, respectively. The engine used for the measurements was a car diesel engine converted to single-cylinder operation and modified for optical access. The fuel, n-heptane, was injected by a direct injection common-rail system and the engine was also fitted with an EGR system.



The engine was operated in both HCCI mode and diesel mode. Due to the low load, the diesel mode resulted in low-temperature diesel combustion and because of limitations in maximum pressure and maximum rate of pressure increase of the optical engine, the diesel mode was run at a higher EGR percentage than the HCCI mode to slow down the combustion. A third mode, pilot combustion, was also investigated. This pilot combustion is created by an injection at 30 CAD before TDC followed by a second injection just before TDC.



The OH and formaldehyde LIF images were compared with the heat-release calculated from the pressure traces. Analyses of the emissions, of for example NOx and HC, were also performed for the different operating modes. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Combustion engine laser diagnostics
in
SAE Technical Paper 2004-01-2949
publisher
SAE
external identifiers
  • scopus:84877222797
DOI
10.4271/2004-01-2949
language
English
LU publication?
yes
id
3efa8e3b-7d9d-4d80-8abb-83b18e553ce7 (old id 739907)
date added to LUP
2007-12-17 12:36:22
date last changed
2017-04-16 04:29:53
@article{3efa8e3b-7d9d-4d80-8abb-83b18e553ce7,
  abstract     = {Simultaneous OH- and formaldehyde planar-LIF measurements have been performed in an optical engine using two laser sources working on 283 and 355 nm, respectively. The engine used for the measurements was a car diesel engine converted to single-cylinder operation and modified for optical access. The fuel, n-heptane, was injected by a direct injection common-rail system and the engine was also fitted with an EGR system. <br/><br>
<br/><br>
The engine was operated in both HCCI mode and diesel mode. Due to the low load, the diesel mode resulted in low-temperature diesel combustion and because of limitations in maximum pressure and maximum rate of pressure increase of the optical engine, the diesel mode was run at a higher EGR percentage than the HCCI mode to slow down the combustion. A third mode, pilot combustion, was also investigated. This pilot combustion is created by an injection at 30 CAD before TDC followed by a second injection just before TDC. <br/><br>
<br/><br>
The OH and formaldehyde LIF images were compared with the heat-release calculated from the pressure traces. Analyses of the emissions, of for example NOx and HC, were also performed for the different operating modes.},
  author       = {Hildingsson, Leif and Persson, Håkan and Johansson, Bengt and Collin, Robert and Nygren, Jenny and Richter, Mattias and Aldén, Marcus and Hasegawa, Ryo and Yanagihara, Hiromichi},
  keyword      = {Combustion engine laser diagnostics},
  language     = {eng},
  publisher    = {SAE},
  series       = {SAE Technical Paper 2004-01-2949},
  title        = {Optical Diagnostics of Hcci and Low-Temperature Diesel Using Simultaneous 2-D Plif of Oh and Formaldehyde},
  url          = {http://dx.doi.org/10.4271/2004-01-2949},
  year         = {2004},
}