Numerical modeling of combustion processes and pollutant formations in direct-injection diesel engines |
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Authors: | Seong-Ku Kim Joon Kyu Lee Yong-Mo Kim Jae-Hyun Ahn |
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Affiliation: | (1) Korea Aerospace Research Institute, 305-333 Daejeon, Korea;(2) Department of Mechanical Engineering, Hanyang University, 17, Haengdang-Dong, Sungdong-Ku, 133-791 Seoul, Korea |
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Abstract: | The Representative Interactive Flamelet (RIF) concept has been applied to numerically simulate the combustion processes and
pollutant formation in the direct injection diesel engine. Due to the ability for interactively describing the transient behaviors
of local flame structures with CFD solver, the RIF concept has the capabilities to predict the auto-ignition and subsequent
flame propagation in the diesel engine combustion chamber as well as to effectively account for the detailed mechanisms of
soot formation, NOX formation including thermal NO path, prompt and nitrous NOX formation, and reburning process. Special emphasis is given to the turbulent combustion model which properly accounts for
vaporization effects on the mixture fraction fluctuations and the pdf model. The results of numerical modeling using the RIF
concept are compared with experimental data and with numerical results of the commonly applied procedure which the low-temperature
and high-temperature oxidation processes are represented by the Shell ignition model and the eddy dissipation model, respectively.
Numerical results indicate that the RIF approach including the vaporization effect on turbulent spray combustion process successfully
predicts the ignition delay time and location as well as the pollutant formation. |
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Keywords: | Flamelet Model Autoignition Detailed Chemistry Pollutant Formation Vaporization Effects on Turbulent Spray Combustion Process |
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