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Zero-Dimensional Simulation of Diesel Engine Combustion and Emissions Based on CMC Model and Skeletal Reaction Mechanism
Journal Article
2011-01-0845
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Citation:
Kwon, J., Seo, J., Lee, D., and Huh, K., "Zero-Dimensional Simulation of Diesel Engine Combustion and Emissions Based on CMC Model and Skeletal Reaction Mechanism," SAE Int. J. Engines 4(1):964-975, 2011, https://doi.org/10.4271/2011-01-0845.
Language:
English
Abstract:
A zero-dimensional code is developed to simulate turbulent spray
combustion and NOx and soot emission in direct injection diesel
engines. The code consists of two major parts; mixing calculation
for the probability density function (PDF) based on the multi-zone
model by Hiroyasu et al., (1983) and the flame structure by the
conditional moment closure (CMC) model (Klimenko & Bilger,
1999). The skeletal mechanism of n-heptane is employed with the
elementary reaction steps for heat release and the NOx chemistry in
GRI 3.0. The spray model accounts for evaporation and mixing based
on momentum balance of the spray zones, while the CMC model
incorporates the conditional flame structures with one fuel group
or flame structure for each injection. The spatially integrated
density-weighted PDF, F(η), is defined to represent inhomogeneous
mixture distribution in the cylinder. The one-equation soot model
is employed for prediction of the soot emission. The program has
been validated over a wide range of load and rpm with different
injection schedules and EGR levels. Comparison shows reasonable
agreement with measurements for the pressure trace and the NOx and
soot emissions for all 16 cases with a single set of tuned
constants.