Simple Modeling of Autoignition in Diesel Engines for 3-D Computations 932656
For practical, extensive 3-D computations for engine improvements, each physical submodel needs to be the simplest that is compatible with the accuracy of all other physical submodels and of the numerics. The addition of one progress variable controlled by one Arrhenius term is shown to be adequate to reproduce Diesel ignition delay in 2-D and 3-D computations. The rest of the model is that used for years by the authors to optimize combustion in reciprocating and rotary engines with premixed and non-premixed charges, including all of its model constants. This minimal Diesel autoignition submodel reproduces well trends and magnitudes of ignition delay versus chamber temperature and pressure. As in experiments, it is found that multiple ignition sources develop in rapid succession at various locations around the fuel spray after the first ignition event. The many ignition sites quickly generate a combustion envelope around the spray that subsequently vaporizes and burns mostly controlled by diffusion.
Citation: Abraham, J. and Bracco, F., "Simple Modeling of Autoignition in Diesel Engines for 3-D Computations," SAE Technical Paper 932656, 1993, https://doi.org/10.4271/932656. Download Citation
Author(s):
J. Abraham, F. V. Bracco
Affiliated:
Princeton University
Pages: 12
Event:
International Fuels & Lubricants Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1993 Transactions: Journal of Fuels & Lubricants-V102-4
Related Topics:
Rotary engines
Diesel / compression ignition engines
Fuel injection
Combustion and combustion processes
Simulation and modeling
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