A study of the noise from a small-scale, semi-span test of a hovering tilt rotor is presented. The effect on noise of the tilt rotor fountain and of several tilt rotor configuration changes is examined. Measurements were made of an isolated rotor; rotor and wing; rotor and image plane; and rotor, wing and image plane. This last configuration models a tilt rotor. With a tilt rotor, the wing turns some of the rotor downwash inboard. When the flows meet, some of the flow is forced upward creating a fountain. Some of the fountain is ingested into the rotor disc. Rotor fountain interactions produce very unsteady impulsive noise to the rear of the aircraft. Configuration changes to investigate download reduction included increasing the rotor/wing separation, deflecting the flap, adding the nacelle, adding vortex trapping plates and blowing on the upper surface. These configuration changes produced little or no effect on the noise, although they changed the net download. Increasing the wing span, however, reduced the annoying content of this impulsive noise about 2 dB.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Study of noise on a small-scale hovering tilt rotor


    Weitere Titelangaben:

    Die Geräuschanalyse eines Schwenkrotors im Labormaßstab


    Beteiligte:
    Mosher, M. (Autor:in) / Light, J.S. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1996


    Format / Umfang :

    10 Seiten, 18 Bilder, 2 Tabellen, 15 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Study of Noise on a Small-Scale Hovering Tilt Rotor

    Mosher, M. / Light, J. S. / Ames Research Center et al. | British Library Conference Proceedings | 1993


    Study of noise on a small-scale hovering tilt rotor

    Mosher, M. | Online Contents | 1996


    Study of Noise on a Small-Scale Hovering Tilt Rotor

    Mosher, M. / Light, J. S. / Ames Research Center et al. | British Library Conference Proceedings | 1994


    Skin friction measurements on a hovering full-scale tilt rotor

    Wadcock, A.J. / Yamauchi, G.K. / Driver, D.M. | Tema Archiv | 1999