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Heat Release in the End-Gas Prior to Knock in Lean, Rich and Stoichiometric Mixtures With and Without EGR
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
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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 modeling of the end-gas reactions.
- Börje Grandin - Chalmers University of Technology
- Ingemar Denbratt - Chalmers University of Technology
- Joakim Bood - Lund Institute of Technology
- Christian Brackmann - Lund Institute of Technology
- Per-Erik Bengtsson - Lund Institute of Technology
- Adina Gogan - Lund Institute of Technology
- Fabian Mauss - Lund Institute of Technology
- Bengt Sundén - Lund Institute of Technology
CitationGrandin, B., Denbratt, I., Bood, J., Brackmann, C. et al., "Heat Release in the End-Gas Prior to Knock in Lean, Rich and Stoichiometric Mixtures With and Without EGR," SAE Technical Paper 2002-01-0239, 2002, https://doi.org/10.4271/2002-01-0239.
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