10th Symposium "The Working Process of the Internal Combustion Engine"
Diesel Combustion Modeling: Tradeoff between Significance and Applicability
Authors
Dr.-Ing. Philipp Adomeit, Dipl.-Ing. Michael Becker, Dipl.-Ing. Hans Rohs, FEV Motorentechnik GmbH, Prof. Dr.-Ing. Stefan Pischinger, Lehrstuhl für Verbrennungskraftmaschinen, RWTH Aachen
Year
2005
Summary
This paper compares different Diesel combustion models. Detailed CFD-models as well as simplified phenomenological approaches have been evaluated regarding their feasibility as development tools. Spatial and temporal characteristics of gas temperature and of the concentrations of CO, O2 and soot were available for model calibration from gas sampling measurements and laser optical investigations within a DI-Diesel engine. The analysis focuses on the capability of the models to predict levels and trends of exhaust emissions. A method based on classifying simulation results in temperature and air-fuel ratio classes is introduced which allows for comparison and assessment of the various combustion models. It is shown that the temporal characteristics of this temperature – air-fuel ratio distribution are significant for formation and oxidation of the emission relevant species.
Members of the Austrian Society of Automotive Engineers have access to all lectures of the International Vienna Motor Symposia.