F2008-06-103
Advanced Combustion Concepts and Development Methods for Hydrogen IC Engines
KEYWORDS - Hydrogen Engine, Optical Engine, 3D-CFD Simulation, Efficiency
ABSTRACT - For several years now BMW Group Research and Technology in cooperation with Graz University of Technology, Institute for Internal Combustion Engines and Thermodynamics, has been furthering the advancement of combustion processes utilizing hydrogen as a fuel and direct injection. Thereby one main focus is laid on the prospects and challenges referring to the application of high-pressure DI.
Goal is the development of hydrogen combustion systems for passenger cars providing highest efficiency and power density, both outranging the respective values of today´s modern gasoline and diesel engines.
By means of data obtained from both simulation and experiment the progress in the field of combustion system development for hydrogen direct injection concepts shall be documented. In particular the methodology of a closed-loop development-process "3D-CFD simulation - optical measurement - single cylinder thermodynamic research engine" shall be shown based on concrete examples and results.
The 3D-CFD method - applied on both mixture formation and combustion - provides valuable inputs referring to promising layouts for both injector- and piston-geometry. To more precisely validate the results obtained from the mathematical models chosen within the CFD-code an optical accessible single cylinder research engine is additionally employed. For more detailed information regarding engine efficiency, emissions and specific power output the layouts found via the help of the aforementioned methods finally are extensively tested in various test series on a single cylinder thermodynamic research engine.
Exemplarily the properties of different combustion chamber- and injector nozzle-geometries and their impacts on engine related parameters shall be compared to one another for both self-ignited and compression-ignited combustion systems. Due to conceptually different approaches differences to some extent occur regarding for instance wall heat transfer and/or conversion rates, which in succession directly take influence on the engine efficiency achievable with the respective layout.
Session: Hydrogen