Prediction of Combustion Delay and -Duration of Homogeneous Charge Gasoline Engines based on In-Cylinder Flow Simulation 2009-01-1796
In this paper a new approach is presented to evaluate the combustion behaviour of homogeneous gasoline engines by predicting burn delay and -duration in a way which can be obtained under the time constraints of the development process. This is accomplished by means of pure in-cylinder flow simulations without a classical combustion model. The burn delay model is based on the local distribution of the turbulent flow near the spark plug. It features also a methodology to compare different designs regarding combustion stability. The correlation for burn duration uses a turbulent characteristic number that is obtained from the turbulent flow in the combustion chamber together with a model for the turbulent burning velocity. The results show good agreement with the combustion process of the analyzed engines.
Citation: Wiese, W., Pischinger, S., Adomeit, P., and Ewald, J., "Prediction of Combustion Delay and -Duration of Homogeneous Charge Gasoline Engines based on In-Cylinder Flow Simulation," SAE Technical Paper 2009-01-1796, 2009, https://doi.org/10.4271/2009-01-1796. Download Citation
Wolfram Wiese, Stefan Pischinger, Philipp Adomeit, Jens Ewald
Institute for Combustion Engines, RWTH-Aachen University, FEV Motorentechnik GmbH