Initial results of a program to investigate the sources of noise in unshrouded propellers under forward flight conditions are reported. Tests were conducted using a three-blade full-scale instrumented propeller mounted on a twin-engine aircraft. Measurements included (1) far-field noise at fixed ground stations and at two aircraft wing tip locations, (2) blade surface pressures at seven locations on one of the propeller blades, (3) atmospheric turbulence encountered by the aircraft in flight, and (4) aircraft operating conditions. The results confirm that significantly lower levels of propeller noise are produced in forward flight than at static conditions. It is tentatively concluded that propeller noise generation in flight may be dominated by steady loading at blade passage frequency, but at higher frequencies unsteady loading due to interaction with natural atmospheric turbulence may be the dominant mechanism of noise generation. Under static conditions the total noise signature appears to be the result of interaction of the propeller with persistent turbulent eddies passing through the propeller disk.


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    Titel :

    Progress report on propeller aircraft flyover noise research


    Beteiligte:
    Metzger, F. B. (Autor:in) / Magliozzi, B. (Autor:in) / Pegg, R. J. (Autor:in)

    Kongress:

    Business Aircraft Meeting ; 1976 ; Wichita, Kan.


    Erscheinungsdatum :

    1976-04-01


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Progress Report on Propeller Aircraft Flyover Noise Research

    Magliozzi, Bernard / Metzger, Frederick B. / Pegg, Robert J. | SAE Technical Papers | 1976


    Propeller Aircraft Flyover Noise Testing

    Shreve, James C. | SAE Technical Papers | 1977


    Annoyance caused by propeller airplane flyover noise

    Mccurdy, D. A. / Powell, C. A. | NTRS | 1984


    Aircraft flyover noise measurements

    ZWIEBACK, E. | AIAA | 1975