The fuel efficiency and life cycle cost of small gas turbine auxiliary power units (APU) for commercial aircraft applications is examined. Fuel efficiency has been improved through the use of higher cycle pressure ratios. However, a higher pressure ratio, and associated increase in compressor discharge temperature, results in an incompatibility with commercial aircraft bleed air temperature and pressure limits. This has led to introduction of load compressor and dual spool APU's. Both of these approaches have increased design sophistication, increased cost, and reduced durability. A complex trade off arises between the design constraints of fuel efficiency and total cost. The paper identifies the trade off parameters which must be addressed in order to select an optimum APU design solution for future commercial type aircraft applications.


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    Title :

    APU fuel efficiency and affordability for commercial aircraft


    Additional title:

    Kraftstoffverbrauch und Abgabeleistung von Hilfsantriebsturbinen fuer Verkehrsflugzeuge


    Contributors:
    Rodgers, C. (author) / Johnson, D.C. (author)

    Published in:

    AIAA-Papers ; Jul ; 1-12


    Publication date :

    1987


    Size :

    12 Seiten, 11 Bilder, 5 Tabellen, 7 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English