As part of a program to investigate combustor and other core noises, simultaneous measurements of internal fluctuating pressure and far field noise were made with a JT15D turbofan engine. Acoustic waveguide probes, located in the engine at the combustor, at the turbine exit and in the core nozzle wall, were used to measure internal fluctuating pressures. Low frequency acoustic power determined at the core nozzle exit corresponds in level to the far-field acoustic power at engine speeds below 65% of maximum, the approach condition. At engine speeds above 65% of maximum, the jet noise dominates in the far-field, greatly exceeding that of the core. From coherence measurements, it is shown that the combustor is the dominant source of the low frequency core noise. The results obtained from the JT15D engine were compared with those obtained previously from a YF102 engine, both engines having reverse flow annular combustors and being in the same size class.


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    Titel :

    Core noise measurements from a small, general aviation turbofan engine


    Beteiligte:
    Reshotko, M. (Autor:in) / Karchmer, A. (Autor:in)

    Kongress:

    Meeting of Acoustical Society of America ; 1980 ; Los Angeles, CA


    Erscheinungsdatum :

    01.11.1980


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Core noise measurements from a small, general aviation turbofan engine

    Reshotko, Meyer / Karchmer, Allen | TIBKAT | 1980


    LARZAC: A Small Turbofan Engine for Military and General Aviation Aircraft

    Greenburg, Harley D. / Chuslo, Lawrence A. | SAE | 1974


    Core noise measurements on a YF-102 turbofan engine

    RESHOTKO, M. / KARCHMER, A. / PENKO, P. et al. | AIAA | 1977