Investigation of End-Gas Temperature and Pressure Increases in Gasoline Engines and Relevance for Knock Occurrence

Paper #:
  • 971671

Published:
  • 1997-05-01
Citation:
Hajireza, S., Mauss, F., and Sundén, B., "Investigation of End-Gas Temperature and Pressure Increases in Gasoline Engines and Relevance for Knock Occurrence," SAE Technical Paper 971671, 1997, https://doi.org/10.4271/971671.
Pages:
10
Abstract:
A detailed analysis of the end-gas temperature and pressure in gasoline engines has been performed. This analysis leads to a simplified zero-dimensional model, that considers both, the compression and the expansion of the end-gas by the piston movement, and the compression by the flame front. If autoignition occurs in the end-gas the sudden rise of the pressure and the heat release is calculated. The rate form of the first law of thermodynamics for a control volume combined with the mass conservation equation for an unsteady and a uniform-flow process are applied. The heat of formation in the end-gas due to the chemical activity has been taken into account. In addition, a chemical kinetic model has been applied in order to study the occurrence of autoignition and prediction of knock.
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