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Automatic Reduction of Detailed Chemical Reaction Mechanisms for Autoignition Under SI Engine Conditions
Technical Paper
2000-01-1895
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A method for automatic reduction of detailed reaction mechanisms using simultaneous sensitivity, reaction flow and lifetime analysis has been developed and applied to a two-zone model of an SI engine fuelled with Primary Reference Fuel (PRF). Species which are less relevant for the occurrence of autoignition in the end gas are declared redundant. They are identified and eliminated for different pre-set minimum levels of reaction flow and sensitivity. The resulting skeletal mechanism is valid in the ranges of initial and boundary values for which the analyses have been performed. A measure of species lifetime is calculated from the chemical source terms, and the species with the lifetime shorter than and mass-fraction less than specified limits are selected for removal. These are assumed to be in steady state, and their concentrations are modeled by means of algebraic equations that are automatically implemented in FORTRAN subroutines computing the steady-state concentrations by internal iteration. The detailed mechanism is reduced to 19 species, limited by the number of fuels, oxygen, products and stable intermediates. It is found that the error in autoignition time is less than 1 CAD down to 19 species. The error increases monotonously with the increase of the pre-set limits defining the level of reduction. To estimate the overall effect of reduction, sensitivities of selected species on temperature are calculated.
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Authors
- Hakan Serhad Soyhan - Lund Institute of Technology
- Per Amnéus - Lund Institute of Technology
- Terese Løvås - Lund Institute of Technology
- Daniel Nilsson - Lund Institute of Technology
- Peter Maigaard - Lund Institute of Technology
- Fabian Mauss - Lund Institute of Technology
- Cem Sorusbay - Istanbul Technical University
Citation
Soyhan, H., Amnéus, P., Løvås, T., Nilsson, D. et al., "Automatic Reduction of Detailed Chemical Reaction Mechanisms for Autoignition Under SI Engine Conditions," SAE Technical Paper 2000-01-1895, 2000, https://doi.org/10.4271/2000-01-1895.Also In
References
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