ANALYSIS OF PREDICTED AIRCRAFT WAKE VORTEX TRANSPORT AND COMPARISON WITH EXPERIMENT. VOLUME I. WAKE VORTEX PREDICTIVE SYSTEM STUDY

A unifying wake vortex transport model is developed and applied to a wake vortex predictive system concept. The fundamentals of vortex motion underlying the predictive model are discussed including vortex decay, bursting and instability phenomena. A parametric and sensitivity analysis is presented to establish baseline uncertainties in the algorithm to allow meaningful comparison of predicted and measured vortex tracks. A detailed comparison of predicted vortex tracks with photographic and groundwind vortex data is presented. Excellent agreement between prediction and measurement is shown to exist when sufficient wind data are available. Application of the Pasquill class criteria is shown to be an effective technique to describe the wind profile in the absence of detailed wind data. The effects of wind shear and the Ekman spiral on vortex transport are discussed. It is shown that the combination of wind shear and ground plane may be possible mechanisms underlying vortex tilting and a theoretical explanation is advanced that is somewhat supported by comparison with the experimental data. Finally, recommendations for further vortex data collection in the vicinity of an airport are presented. (Author)

  • Supplemental Notes:
    • See also Volume 2, AD-783 665.
  • Corporate Authors:

    Lockheed Missiles and Space Company

    Huntsville Research and Engineering Center
    Huntsville, AL  USA  35807

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  USA  02142

    Federal Aviation Administration

    Systems R&D Service, 800 Independence Avenue, SW
    ,   USA 
  • Authors:
    • Brashears, M R
    • Logan, N A
    • Robertson, S J
    • Shrider, K R
    • Walters, C D
  • Publication Date: 1974-4

Media Info

  • Pagination: 249 p.

Filing Info

  • Accession Number: 00071879
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Final Rpt.
  • Contract Numbers: DOT-TSC-593
  • Files: NTIS, USDOT
  • Created Date: Dec 19 1974 12:00AM