In conventional gas turbine engines, air is used as the working fluid to produce required power for the compressor and ancillary components. The use of the fuel as the turbine working fluid offers several cycle advantages, and is especially attractive if hydrogen has been selected as the fuel. Liquid fuels can be pumped to high pressures with a relatively small amount of work, compared to the compression requirements of air, providing potential for a large amount of expansion work in the turbine. In addition, the attainable fuel pressures are generally independent of engine inlet conditions and altitude. Engine cycles based on the use of the fuel as the primary working fluid will be generically referenced in this paper as 'expander' cycles, whether fuel alone, or partially reacted fuel, is expanded in the turbine. Since compressed air is not the primary working fluid in the turbine, a general characteristic of expander cycle engines is the ability to produce higher nozzle pressures for a given overall pressure ratio. Three expander cycle engine concepts are examined in the paper, including the regenerative cycle demonstrated in the PW 304 engine, a preburning hydrogen/oxygen ATR engine, and an advanced concept twin-spool gas generator hydrogen engine. These engine concepts have been examined with regard to mechanical arrangements, performance, and operational capabilities. The relative merits of these three engine cycles are described, and their net payoffs are compared on the basis of mission capability for a defined mission requirement.


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    Title :

    Advancements in hydrogen expander airbreathing engines


    Additional title:

    Fortschritte bei Wasserstoffexpansionsmotoren mit Luftansaugung


    Contributors:

    Published in:

    AIAA-Papers ; Jul ; 1-5


    Publication date :

    1987


    Size :

    5 Seiten, 10 Bilder, 1 Quelle


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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