Efforts to develop an engine noise reduction technology suitable for use on subsonic and conventional takeoff and landing type aircraft are reported. Two baseline quiet engines were developed and tested. The engines were designed with the following quiet features: (1) high bypass ratio engine, (2) large rotor-stator spacing of rotor chords, (3) reduced rotor tip speeds, (4) sound absorbing liners in inlet-outlet ducts, and (5) an optimum ratio from stator to rotor blades. Test results show that if these features are applied to future aircraft, substantial reduction in aircraft noise levels will be obtained.


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    Title :

    The NASA Quiet Engines


    Contributors:

    Publication date :

    1972


    Size :

    18 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    The NASA quiet engines

    Ciepluch, C. C. | NTRS | 1972



    The NASA quiet engine

    Kramer, J. J. | NTRS | 1971


    The NASA Quiet Engine.

    Kramer, J. J. | NTRS | 1971


    The NASA Quiet Engine

    Kramer, James J. | SAE Technical Papers | 1971