FLOW FIELD PROPERTIES IN THE VICINITY OF A TRACTOR/SEMITRAILER TRUCK, AND CORRELATION WITH THE AERODYNAMIC DISTURBANCE OF AN ADJACENT VEHICLE

Flow field properties were measured at various locations in the vicinity of a tractor/semitrailer truck. The results were expressed as 3 dimensional flow vectors, and as dynamic pressure estimates. The horizontal flow vector components showed good correlation with the side force disturbance caused by the truck on an adjacent vehicle. The dynamic pressure estimates provided some qualitative understanding of the nature of the flow field. The overall results showed that changing the truck width from 96 to 102 in. caused a small increase in the flow angularity near the front of the truck in the zero cross-wind case, but it had no effect on either the flow field farther aft of the truck or the case with a substantial crosswind component. Changes in the flow properties did occur with increasing lateral separation from the truck centerline, and with changes in longitudinal position relative to the front of the truck. These results and effects are consistent with the changes which occur to the disturbing forces and moments on a passenger vehicle, when operating in the vicinity of a truck or bus during an overtaking and passing maneuver. /FHWA/

  • Availability:
  • Corporate Authors:

    Systems Technology, Incorporated

    13766 South Hawthorne Boulevard
    Hawthorne, CA  USA  90250
  • Authors:
    • JOHNSON, W A
    • WEIR, D H
  • Publication Date: 1972-10

Media Info

  • Pagination: 46 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00130593
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • ISBN: 31J3012
  • Report/Paper Numbers: Final Rpt.
  • Contract Numbers: DOT-FH-11-7570
  • Files: TRIS, USDOT
  • Created Date: Mar 29 1976 12:00AM