Combustion
Theory and Modelling, Volume 16, Issue 3, 2012 , pages 571-588,
DOI:10.1080/13647830.2011.642819
A
mixing controlled direct chemistry (MCDC) model for diesel engine combustion
modelling using large eddy simulation
Yuxin Zhang a & Christopher J. Rutland a
a Engine Research Center, University of Wisconsin-Madison, Madison, WI, USA
Abstract
Describes
evaluation of a mixing controlled direct chemistry (MCDC) combustion model with
sub-grid scale (SGS) mixing effects and chemical kinetics for Large Eddy
Simulation (LES) of diesel engine combustion. Researchers modeled the mixing
effect by a mixing timescale based on mixture fraction variance and sub-grid
scalar dissipation rate.
They modeled the SGS scalar dissipation rate using a similarity term
and a scaling factor from the analysis of Direct Numerical Simulation (DNS)
data. Estimates of the chemical reaction progress were obtained from a kinetic
timescale based on local internal energy change rate and equilibrium state
internal energy. An optical research engine operating at conventional operating
conditions and Low Temperature Combustion (LTC) conditions was used for
evaluation of the combustion model. From the simulation results, the effect of
SGS scalar mixing is evaluated at different stages of combustion. In the
context of LES, the new approach provides improved engine modeling results
compared to the Direct Chemistry Solver (DCS) combustion model.
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