A theoretical and experimental program is underway at NASA Ames Research Center to first obtain a better understanding of the hazard posed by the vortex wakes of subsonic transports, and then to develop methods on how to modify the wake-generating aircraft in order to make the vortices less hazardous. This paper summarizes results obtained in the 80- by 120-Foot Wind Tunnel at NASA Ames Research Center on the characteristics of the vortex wakes that trail from 0.03 scale models of a B-747 and of a DC-10. Measurements are first described that were taken in the wakes with a hot-film anemometer probe, and with wings that range in size from 0.2 to 1.0 times the span of the wake-generating models at downstream distances of 81 ft and 162 ft behind the wake-generating model; i.e., at scale distances of 0.5 and 1.0 mile. The data are then used to evaluate the accuracy of a vortex-lattice method for prediction of the loads induced on following wings by vortex wakes.


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    Title :

    Measurements in vortex wakes shed by conventional and modified subsonic aircraft


    Additional title:

    Messungen im Wirbelnachlauf von konventionellen und modifizierten Unterschallflugzeugen


    Contributors:


    Publication date :

    1996


    Size :

    10 Seiten, 14 Bilder, 3 Tabellen, 23 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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