The roll-up and development of the tip vortices generated by subscale helicopter rotors were measured and analyzed. The measurements were performed on one- and two-bladed hovering rotors using three-component laser Doppler velocimetry. A trip strip was used to simulate boundary-layer transition at the higher Reynolds numbers typical of the full-scale rotor. The detailed velocity field of the tip vortex was investigated, a strong selfsimilarity of the swirl velocity profile being found. The measurements suggest a general logarithmic growth of the viscous core, which for older vortex ages is proportional to the square root of time (vortex age). Measurements from other helicopter rotor and fixed-wing experiments are used to support the observations.


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    Titel :

    Correlation of helicopter rotor tip vortex measurements


    Weitere Titelangaben:

    Strömungsfeld der Spitzenwirbel eines Hubschrauberrotors


    Beteiligte:
    Bhagwal, M.J. (Autor:in) / Leishman, J.G. (Autor:in)

    Erschienen in:

    AIAA Journal ; 38 , 2 ; 301-308


    Erscheinungsdatum :

    2000


    Format / Umfang :

    8 Seiten, 19 Bilder, 1 Tabelle, 40 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Correlation of Helicopter Rotor Tip Vortex Measurements

    Mahendra J. Bhagwat / J. Gordon Leishman | AIAA | 2000



    Vortex flow over helicopter rotor tips

    HOFFMAN, J. D. / VELKOFF, H. R. | AIAA | 1971