Modelling of real fuels for an effective virtual engine development with focus on alternative fuel

Autoren

M. Sc. Francesco Cupo, Dr.-Ing. Marco Chiodi, Prof. Dr.-Ing. Michael Bargende, FKFS;
Dipl.-Ing. Daniel Koch, Prof. Dr.-Ing. Georg Wachtmeister, Technische Universität München;
Dr.-Ing. Donatus Wichelhaus, Volkswagen AG

Jahr

2019

Zusammenfassung

The worldwide environmental issues are affecting the development processes in all industrial sectors. Among these, the automotive is probably the one facing the toughest challenges. The reduction of both harmful emissions (CO, HC, NOx, etc.) and gases responsible for greenhouse effects (especially CO₂) are mandatory aspects to be considered in the development process of any kind of propulsion concept. A comprehensive well-to-wheel analysis – in comparison with the less inclusive yet very common tank-to-wheel approach – is for sure the most appropriate way in order to effectively measure future progresses. All mobility scenarios until 2050 confirm that internal combustion engines (ICEs) will still play an important role (especially as hybrid-solutions) for
passenger cars and even more for trucks and marine applications. Focusing on ICEs, the main development topics are today not only the reduction of harmful emissions, increase of thermodynamic efficiency, etc. but also the decarbonization of the fuels. The last point offers the highest potential for the reduction of CO₂ emissions. Following this approach, the development of future ICEs is closely linked to the development of CO₂ neutral fuels (e.g. biofuels and e-fuels). Accordingly, engines and fuels will be part of a common development process. This implies an increase in development complexity, which needs to be supported by engine simulations, now more than ever. In this work, the virtual modelling of real fuel behavior is addressed in order to improve
current simulation capabilities in studying how a specific composition can affect engine performance. The goal is to create a series of models that allow to virtually investigate
different fuels and to minimize as much as possible the costly and time-consuming experimental tests. The fuel investigation - conducted virtually at the FKFS of Stuttgart and experimentally at the engine laboratory of the Chair of Internal Combustion Engines at the Technical University of Munich with the support from Volkswagen Motorsport GmbH - was performed on a single cylinder research engine operating with the innovative SACI (Spark Assisted Compression Ignition) combustion concept.

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