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Heat Release in the End-Gas Prior to Knock in Lean, Rich and Stoichiometric Mixtures With and Without Egr

Grandin, Börje ; Denbratt, Ingemar ; Bood, Joakim LU ; Brackmann, Christian LU ; Bengtsson, Per-Erik LU orcid ; Mauss, Fabian LU ; Sundén, Bengt LU and Gogan, Adina LU (2002) In SAE Technical Papers
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)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combustion Engines
in
SAE Technical Papers
publisher
Society of Automotive Engineers
external identifiers
  • scopus:85072456214
ISSN
0148-7191
language
English
LU publication?
yes
additional info
Document number 2002-01-0239
id
d4233ac9-a1d4-4bc9-a25c-26dda13dc630 (old id 697845)
alternative location
http://www.sae.org/technical/papers/2002-01-0239
date added to LUP
2016-04-04 14:34:07
date last changed
2022-01-30 02:11:53
@article{d4233ac9-a1d4-4bc9-a25c-26dda13dc630,
  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, Börje and Denbratt, Ingemar and Bood, Joakim and Brackmann, Christian and Bengtsson, Per-Erik and Mauss, Fabian and Sundén, Bengt and Gogan, Adina}},
  issn         = {{0148-7191}},
  keywords     = {{Combustion Engines}},
  language     = {{eng}},
  publisher    = {{Society of Automotive Engineers}},
  series       = {{SAE Technical Papers}},
  title        = {{Heat Release in the End-Gas Prior to Knock in Lean, Rich and Stoichiometric Mixtures With and Without Egr}},
  url          = {{http://www.sae.org/technical/papers/2002-01-0239}},
  year         = {{2002}},
}