Hydrogen is widely considered as fuel of the future for upcoming scenarios of a sustainable assured individual mobility. As is generally known, at the generation of hydiogen horn regenerative energy sources the discharge of climate-relevant CO2 is prevented completely. Hydrogen internal combustion engines provide an opportunity to maintain or even outperform the performance level of current motor vehicle powertrains constdering the climatic compatibility of fuel. Due to the physical properties of hydrogen on-board cryogenic liquid storage of fuel provides the best prerequisite to achieve currently customary cruising ranges. Consistent utilization of the cold reservoir on-board due to the liquid tank opens new perspectives at the optimization ot internal combustion engines. This paper serves as an overview on the implementation of computational methods to optimize mixture formation and combustion ot a hydrogen internal combustion engine It does not focus on the model development, but on the concrete challenges and questions resulting from the simulation of the in-cylinder flow during charge changing cycle and combustion. Especially the simulation of engine combustion with 3D CFD tools has limits in the performance capability of present computer resources in the practical application These limits, due to the computer capacity, lead to constraints with regard to the resolution of numerical meshes as well as the complexness of applied models Thus, the influence of mesh solutions as well as differing turbulence and combustion models is investigated in detail on the computation results. Engine application potentials and limits of present computation methods are displayed. The expressiveness ot the computation results is demonstrated by a comparison with expemnental results. For this purpose results of a hydrogen single cylinder engine opeiated at the BMW Group Research and Technology with port injection of cryogenic hydrogen are used.
Simulation of a hydrogen internal combustion engine with cryogenic mixture formation
Simulation eines Wasserstoff-Verbrennungsmotors mit kryogener Gemischbildung
2007
14 Seiten, 6 Bilder, 4 Tabellen, 19 Quellen
Conference paper
English
Simulation of a hydrogen internal combustion engine with cryogenic mixture formation
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