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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    Title :

    Correlation of helicopter rotor tip vortex measurements


    Additional title:

    Strömungsfeld der Spitzenwirbel eines Hubschrauberrotors


    Contributors:

    Published in:

    AIAA Journal ; 38 , 2 ; 301-308


    Publication date :

    2000


    Size :

    8 Seiten, 19 Bilder, 1 Tabelle, 40 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English