Charge Motion Development for the Realization of Robust SI Combustion Systems

Authors

Dipl.-Ing. Wolfram Wiese, Lehrstuhl für Verbrennungskraftmaschinen, RWTH Aachen, Dr.-Ing. Philipp Adomeit, Dr.-Ing. Jens Ewald FEV Motorentechnik GmbH, Aachen

Year

2007

Summary

Charge motion development is an integral part of the SI combustion system development, as flow and turbulence characteristics directly affect the quality of combustion and emissions. In order to estimate combustion stability including burn delay and duration, a novel development method is presented. It is based on a combination of flow measurement and CFD simulation of the motored in-cylinder flow and the local distribution of turbulence quantities in the vicinity of the spark plug. In combination with the thermodynamic conditions the ignition model of Ewald (2006) is used to obtain a first estimation for the burn delay duration and formulate a measure for the stability of ignition. Results from different combustion systems are employed to obtain model parameters for the burn delay model and the burn duration correlation. It is shown that based on these correlations a first quantitative estimation on both burn delay and burn duration can be obtained.

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