Abstract
High SI engine part load efficiencies require simultaneously part load dethrottling and small burn durations. The latter ones necessitate – in case of SI combustion in its prevalent appearance – minimum residual burnt gas and high in-cylinder turbulence generated by charge motion. These demands can especially be fulfilled by variable valve trains with asymmetric valve actuation, also called intake valve lift phasing with intake port deactivation as its borderline case. They can combine early intake valve closing and strong charge motion generation, which contains both tumble and swirl.
In order to enable phenomenological burn rate prediction via 0D/1D engine simulation for these cases, a quasi-dimensional charge motion and turbulence model has been developed. The generation of charge motion is modeled by use of charge motion coefficients which should be derived from at least one engine operation point calculated by 3D-CFD. The conversion of tumble and swirl to turbulence around top dead center is predicted by a quasi-dimensional flow shear model.
An additional model part is also presented considering an approach for the impact of direct fuel injection on tumble and turbulence. The model development was based on 3D CFD simulations.
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Acknowledgements
The presented models have been developed at the Institute of Internal Combustion Engines and Automotive Engineering (IVK) of the University of Stuttgart, Germany as part of the research tasks within the projects “Modelling of Turbulence II”, “Homogenisation Model SI Engine” and “Modelling emissions of a Diesel engine combustion with variable valve timing” assigned by the Research Association for Combustion Engines (FVV) e. V. (FVV Projects 1233, 1257, 1235). The first two projects were financially supported by the Federal Ministry of Economics and Technology (BMWi) via the German Federation of Industrial Research Associations (AiF) (IGF No. 18494 N and 18759). The authors would like to thank the FVV project user committees under the direction of Dr. David Lejsek, Robert Bosch GmbH, Dipl.-Ing. Oliver Dingel and Dipl.-Ing. Matthias Diezemann, both IAV GmbH. Furthermore, the authors like to thank all the companies involved for their support, the colleagues from the Institute for Land and Sea Transport of the Technical University Berlin for providing experimental results, Siemens AG for providing STAR-CD software licenses as well as FVV and AiF for granting the financing.
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Fritsch, S., Fasse, S., Yang, Q., Grill, M., Bargende, M. (2020). A Quasi-Dimensional Charge Motion and Turbulence Model for Spark Injection Engines with Fully Variable Valve Train and Direct Fuel Injection. In: Liebl, J. (eds) Experten-Forum Powertrain: Ladungswechsel und Emissionierung 2019. Proceedings. Springer Vieweg, Wiesbaden. https://doi.org/10.1007/978-3-658-28709-2_3
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DOI: https://doi.org/10.1007/978-3-658-28709-2_3
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