Modelling of the Combustion Process for a Dual Fuel Diesel System

Autoren

Dr.-Ing. Ömer Ünal, Prof. Dr. Michael Bargende, Institute for Combustion Engines, Universität Stuttgart;
Prof. Dr. Konstantinos Boulouchos, Aerothermochemistry and Combustion Systems Laboratory, ETH Zürich;
Dr. Sc. Sushant S. Pandurangi, ETH Zürich

Zusammenfassung

Natural gas, consisting primarily of methane, is an attractive alternative fuel for passenger vehicles to reduce carbon dioxide (CO₂) emissions. This project focuses on the investigation and modelling of a dual-fuel concept. Existing diesel engines can be operated in dual-fuel mode with an increasing proportion of methane added in the charge mixture as a substitution for reduced diesel mass, in the substitution range of 20 to 80 %. In the framework of this project, a phenomenological combustion model has been developed and validated. The model is based on extensive measurements from a previous research project at Universität Stuttgart, as well as key insights from 3D CFD simulations and experimental investigations on a rapid compression-expansion machine that were carried out at ETH Zürich. The investigations shed light into intrinsic physico-chemical processes and contribute to new knowledge of the in-cylinder phenomena
that govern dual-fuel diesel combustion.

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