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Heat release in the end-gas prior to knock in lean, rich and stochiometric mixtures with and without EGR

Grandin, B.; Denbratt, I.; Bood, Joakim LU ; Brackmann, Christian LU ; Bengtsson, Per-Erik LU ; Gogan, Adina LU ; Mauss, Fabian LU and Sundén, Bengt LU (2002) SAE  World Congress & Exhibition, 2002
Abstract
SI Engine knock is caused by autoignition in the unburnt part of the mixture (end-gas) ahead of the propagating flame. Autoignition of the end-gas occurs when the temperature and pressure exceeds a critical limit when comparatively slow reactions - releasing moderate amounts of heat - transform into ignition and rapid heat release.



In this paper the difference in the heat released in the end-gas - by low temperature chemistry - between lean, rich, stochiometric, and stoichiometric mixtures diluted with cooled EGR was examined by measuring the temperature in the end-gas with Dual Broadband Rotational CARS. The measured temperature history was compared with an isentropic temperature calculated from the cylinder pressure... (More)
SI Engine knock is caused by autoignition in the unburnt part of the mixture (end-gas) ahead of the propagating flame. Autoignition of the end-gas occurs when the temperature and pressure exceeds a critical limit when comparatively slow reactions - releasing moderate amounts of heat - transform into ignition and rapid heat release.



In this paper the difference in the heat released in the end-gas - by low temperature chemistry - between lean, rich, stochiometric, and stoichiometric mixtures diluted with cooled EGR was examined by measuring the temperature in the end-gas with Dual Broadband Rotational CARS. The measured temperature history was compared with an isentropic temperature calculated from the cylinder pressure trace. The experimentally obtained values for knock onset were compared with results from a two-zone thermodynamic model including detailed chemistry modelling of the end-gas reactions. (Less)
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author
organization
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type
Contribution to conference
publication status
published
subject
conference name
SAE  World Congress & Exhibition, 2002
external identifiers
  • other:SAE 2002-01-0239
language
English
LU publication?
yes
id
f5f41bd1-29da-462d-ad8d-173576e97a33 (old id 593392)
date added to LUP
2008-02-26 10:56:05
date last changed
2016-04-16 11:19:24
@misc{f5f41bd1-29da-462d-ad8d-173576e97a33,
  abstract     = {SI Engine knock is caused by autoignition in the unburnt part of the mixture (end-gas) ahead of the propagating flame. Autoignition of the end-gas occurs when the temperature and pressure exceeds a critical limit when comparatively slow reactions - releasing moderate amounts of heat - transform into ignition and rapid heat release. <br/><br>
<br/><br>
In this paper the difference in the heat released in the end-gas - by low temperature chemistry - between lean, rich, stochiometric, and stoichiometric mixtures diluted with cooled EGR was examined by measuring the temperature in the end-gas with Dual Broadband Rotational CARS. The measured temperature history was compared with an isentropic temperature calculated from the cylinder pressure trace. The experimentally obtained values for knock onset were compared with results from a two-zone thermodynamic model including detailed chemistry modelling of the end-gas reactions.},
  author       = {Grandin, B. and Denbratt, I. and Bood, Joakim and Brackmann, Christian and Bengtsson, Per-Erik and Gogan, Adina and Mauss, Fabian and Sundén, Bengt},
  language     = {eng},
  title        = {Heat release in the end-gas prior to knock in lean, rich and stochiometric mixtures with and without EGR},
  year         = {2002},
}