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

B. Grandin, I. Denbratt, Joakim Bood, Christian Brackmann, Per-Erik Bengtsson, Adina Gogan, Fabian Mauss, Bengt Sundén

Forskningsoutput: KonferensbidragKonferenspaper, ej i proceeding/ej förlagsutgivetPeer review

Sammanfattning

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.
Originalspråkengelska
StatusPublished - 2002
EvenemangSAE  World Congress & Exhibition, 2002 - Detroit, Mich., USA
Varaktighet: 2002 mars 42002 mars 7

Konferens

KonferensSAE  World Congress & Exhibition, 2002
Land/TerritoriumUSA
OrtDetroit, Mich.
Period2002/03/042002/03/07

Bibliografisk information

SAE 2002-01-0239

Ämnesklassifikation (UKÄ)

  • Energiteknik

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