Detailed chemistry-based auto-ignition model including low temperature phenomena applied to 3-D engine calculations

A model for the auto-ignition of hydrocarbons applicable to 3D internal combustion engine calculations is proposed in this paper. The limits of classical methods using an auto-ignition delay are investigated when cool flame phenomena are present. A method based on tabulated reaction rates is presented to capture the early heat release induced by low temperature combustion. Cool flame ignition delay when present and cool flame fuel consumption are also tabulated. The reaction rate, fuel consumption, and cool flame ignition delay tables are built a priori from complex chemistry calculations. The reaction rates, which directly depend on instantaneous changes of thermodynamic conditions, are then integrated during the 3D engine calculation. The model is first validated through comparisons with complex chemistry calculations in constant and variable volume configurations where good agreement has been found. The model is then applied to both a Diesel computation with spray injection and residual gases, and a Diesel HCCI configuration. Comparisons with experimental results show that the auto-ignition essential features are well reproduced in these cases. (c) 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.