A PDF-Based Model for Full Cycle Simulation of Direct Injected Engines

2008-01-1606

06/23/2008

Event
2008 SAE International Powertrains, Fuels and Lubricants Congress
Authors Abstract
Content
In one-dimensional engine simulation programs the simulation of engine performance is mostly done by parameter fitting in order to match simulations with experimental data. The extensive fitting procedure is especially needed for emissions formation - CO, HC, NO, soot - simulations.
An alternative to this approach is, to calculate the emissions based on detailed kinetic models. This however demands that the in-cylinder combustion-flow interaction can be modeled accurately, and that the CPU time needed for the model is still acceptable. PDF based stochastic reactor models offer one possible solution. They usually introduce only one (time dependent) parameter - the mixing time - to model the influence of flow on the chemistry. They offer the prediction of the heat release, together with all emission formation, if the optimum mixing time is given. Hence parameter fitting for a number of kinetic processes, that depend also on the in cylinder flow conditions is replaced by a single parameter fitting for the turbulent mixing time.
In this work a PDF based model was implemented and coupled to the full cycle engine simulation tool, WAVE, and calculations were compared to engine experiments. Modeling results show good agreement with the experiments and show that PDF based Dl models can be used for fast and accurate simulation of Dl engine emissions and performance.
Meta TagsDetails
DOI
https://doi.org/10.4271/2008-01-1606
Pages
15
Citation
Tunér, M., Pasternak, M., Mauss, F., and Bensler, H., "A PDF-Based Model for Full Cycle Simulation of Direct Injected Engines," SAE Technical Paper 2008-01-1606, 2008, https://doi.org/10.4271/2008-01-1606.
Additional Details
Publisher
Published
Jun 23, 2008
Product Code
2008-01-1606
Content Type
Technical Paper
Language
English