The application of planar Doppler velocimetry (PDV) measurements to three-dimensional velocity vector fields in the tip-vortex flows between the blades of a full-scale UH-60 rotor operating in the 80- by 120-Foot Wind Tunnel at NASA Ames Research Center is described. The unique capabilities of PDV for remotely measuring complex velocity fields in large-scale flows are demonstrated and the factors affecting the quality of PDV data from a large-scale facility are defined. Because the wind tunnel is a noncirculating, in-draft configuration, and very large, the principal factor that prevented the acquisition of time-resolved, instantaneous measurements was the spatially and temporally sporadic behavior of the aerosol seeding in the sample area. Nevertheless, time-averaged velocity fields were obtained that characterize the locations and velocity distributions of the blade tip vortices and that provide magnitudes and directions of the velocity vectors in the surrounding flow with better than 1-cm spatial resolution within a square, 1.2 m x 1.2 m, sample area from distances up to 20 m.


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    Title :

    Three-dimensional planar Doppler velocity measurements in a full-scale rotor wake


    Additional title:

    Ebene Doppler-Geschwindigkeitsmessung der dreidimensionalen Strömung im Nachlaufgebiet eines Hubschrauberrotors


    Contributors:

    Published in:

    AIAA Journal ; 43 , 3 ; 489-499


    Publication date :

    2005


    Size :

    11 Seiten, 14 Bilder, 25 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English