Heat release in the end-gas prior to knock in lean, rich and stochiometric mixtures with and without EGR
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/593392
- author
- Grandin, B. ; Denbratt, I. ; Bood, Joakim LU ; Brackmann, Christian LU ; Bengtsson, Per-Erik LU ; Gogan, Adina LU ; Mauss, Fabian LU and Sundén, Bengt LU
- organization
- publishing date
- 2002
- type
- Contribution to conference
- publication status
- published
- subject
- conference name
- SAE World Congress & Exhibition, 2002
- conference location
- Detroit, Mich., United States
- conference dates
- 2002-03-04 - 2002-03-07
- external identifiers
-
- other:SAE 2002-01-0239
- language
- English
- LU publication?
- yes
- additional info
- SAE 2002-01-0239
- id
- f5f41bd1-29da-462d-ad8d-173576e97a33 (old id 593392)
- date added to LUP
- 2016-04-04 13:31:30
- date last changed
- 2018-11-21 21:14:33
@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}}, }