Advanced

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 ; Mauss, Fabian LU ; Sundén, Bengt LU and Gogan, Adina LU (2002) In SAE Technical Paper
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
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combustion Engines
in
SAE Technical Paper
external identifiers
  • scopus:79959841571
language
English
LU publication?
yes
id
d4233ac9-a1d4-4bc9-a25c-26dda13dc630 (old id 697845)
alternative location
http://www.sae.org/technical/papers/2002-01-0239
date added to LUP
2007-12-05 11:44:54
date last changed
2017-03-12 04:31:49
@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},
  keyword      = {Combustion Engines},
  language     = {eng},
  series       = {SAE Technical Paper},
  title        = {Heat Release in the End-Gas Prior to Knock in Lean, Rich and Stoichiometric Mixtures With and Without Egr},
  year         = {2002},
}