LDV Measurements of B-747 Wake Vortex Characteristics

In order to determine the behavior of the wake vortices of a B-747 at low altitudes and to measure the vortex decay process behind the B-747 as a function of altitude above ground, flap and spoiler settings and different flight configurations; a B-747 aircraft flew 54 passes at low level over a ground-based laser Doppler velocimeter (LDV) system and other sensors. From the LDV measurements, the location and velocity distribution of the wake vortices and the general vortex roll-up, transport and decay trends were obtained. Results of the study indicated that the deployment of spoilers and flaps enhanced the decay of the vortex peak tangential velocity in the near wake while aircraft altitude glide slope, and landing gear deployment has little effect. The report discusses the LDV wake vortex measurements including the instrumentation used, the experimental test sequence, and the results of the wake measurements in terms of the vortex roll-up, transport and decay trends, and a comparison of the wake vortex characteristics for different configurations.

  • Record URL:
  • Corporate Authors:

    Lockheed Missiles and Space Company Incorporated

    P.O. Box 1103 West Station, Research and Engineering Center
    Huntsville, AL  United States  35807

    Federal Aviation Administration

    Systems R&D Service, 800 Independence Avenue, SW
    Washington, DC  United States 

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142
  • Authors:
    • Brashears, M R
    • Zalay, A D
  • Publication Date: 1977-1


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 227p

Subject/Index Terms

Filing Info

  • Accession Number: 01637985
  • Record Type: Publication
  • Report/Paper Numbers: LMSC-HREC TR D496975
  • Contract Numbers: DOT-TSC-1145
  • Created Date: Jun 15 2017 1:19PM