To cover the increasing demand of on-board electrical power and for further reduction of emissions, the conventional APU (auxiliary power unit) shall be replaced by a fuel cell system. The main components are a compressor-turbine unit, a kerosene reformer, and the fuel cell. PEM-FC (Polymer exchange membrane fuel cells) are favoured because of their currently advanced level of development. During in-flight operation, the inlet conditions of the PEM-FC system must be kept constant in order to avoid mechanical and thermal damage of the membrane and to ensure low levels of pressure fluctuations in the reformer section. A centrifugal compressor is chosen for pressurization of the system. The advantages of turbomachinery are low specific weight, high efficiency, and good controllability by inlet guide vanes and/or adjustable diffuser vanes. To drive the compressor, a radial turbine is used so that the air supply system resembles the turbocharger for a combustion engine.
Conceptual analysis of air supply systems for in-flight PEM-FC
Konzeptionelle Analyse der Luftzuführungssysteme für Polymer-Austauschmembran-Brennstoffzellen während des Fluges
2006
10 Seiten, 11 Quellen
Conference paper
English
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