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Ignition and Combustion Simulations of Spray-Guided SIDI Engine using Arrhenius Combustion with Spark-Energy Deposition Model
Technical Paper
2012-01-0147
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An Arrhenius combustion model (chemically controlled model) with
a spark-energy deposition model having a moving spherical ignition
source in the Converge CFD code is validated with a single-cylinder
spray-guided SIDI engine at idle-like lean-burn operating
conditions with both single- and double-pulse fuel injection. It
was found that a fine mesh is required for accurate solving of
"laminar-flame" like reaction front propagation. A
reduced chemistry mechanism for iso-octane is used as gasoline
surrogate. The effects of spark advance were studied by the
simulation and experiment. The results show that this modeling
approach can provide reasonable predictions for the spray-guided
SIDI engine with single- and double-pulse injections.
The analysis of combustion regimes of the spray-guided SIDI
engine-operating conditions indicates that the Damköhler number
varies from 0.02 to 0.08 (Da≺≺1) and the Karlovitz number varies
from 25 to 800 (Ka≻≻1), implying that ignition and combustion occur
predominantly in thickened flame regimes where the chemical
reactions dominate the combustion due to a slow reaction rate.
Therefore, the assumption of a well-stirred reactor is valid for
the combustion simulation of the spray-guided SIDI engine,
permitting the use of the Arrhenius-type combustion model which
neglects the interaction between reaction and turbulence in each
computational cell.
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Citation
Yang, X., Solomon, A., and Kuo, T., "Ignition and Combustion Simulations of Spray-Guided SIDI Engine using Arrhenius Combustion with Spark-Energy Deposition Model," SAE Technical Paper 2012-01-0147, 2012, https://doi.org/10.4271/2012-01-0147.Also In
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