A study of tilt rotor hover aerodynamics and aeroacoustics is made using a 0.08 scale model of the XV-15 tilt rotor research vehicle. Important dimensionless parameters describing the rotor downwash/airframe interaction flows and the rotor noise they influence are identified, and compared in the model and full scale. Scaling laws are developed to relate the model measurements to prototype. These scales are used to analyze some flow visualization, hot wire measurements and acoustic measurements recently made using the scale model. It is shown that the model can be used to estimate the aeroacustic effects of configuration changes on the prototype aircraft. The results of some add-on devices intended to control the rotor downwash interference flows are discussed. It is shown that a flat plate positioned between the rotors is effective at blocking some transport of turbulent fluctuations back into the rotor disks.


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    Titel :

    Experimental aerodynamic and aeroacoustic investigation of a scaled tilt rotor in hover


    Weitere Titelangaben:

    Die experimentelle aerodynamische und aeroakustische Untersuchung eines maßstäblich verkleinerten Hubschrauberrotors im simulierten Schwebeflug


    Beteiligte:
    Polak, D.R. (Autor:in) / George, A.R. (Autor:in)


    Erscheinungsdatum :

    1994


    Format / Umfang :

    19 Seiten, 12 Bilder, 1 Tabelle, 29 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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