AERODYNAMIC DRAG ON VEHICLES IN ENCLOSED GUIDEWAYS

The purpose of this study was to investigate the aerodynamic drag on vehicles moving in enclosed guideways. The reason for the study was, and is, that several potential high-speed ground-transport system concepts involve high-speed motion of vehicles in enclosed guideways for significant portions of their travel time. Both analytical and experimental studies have been carried out. The analytical studies commenced by developing a solution for the aerodynamic drag on a vehicle in an enclosed guideway in laminar flow. This analysis was based on an analogy, first suggested by Rayleigh, that exists between the governing equations for unsteady flow resulting when an infinite body is started impulsively from rest and for the steady flow that results from steady motion of a semi-infinite body. The results of this analysis for laminar flow provided a base from which to begin, and were then used in an attempt to predict the drag that would result in turbulent flow. The turbulent flow analytical estimate was based on another approximation or analogy which assumes that for any turbulent flow there exists a laminar flow in which corresponding streamlines in the laminar flow can be found to enclose the turbulent wake in the turbulent flow, and that by making use of an effective eddy viscosity in the laminar flow solution, one can predict the drag coefficient in the corresponding turbulent flow. Experimental studies were carried out using 8 spherical models and 16 cylindrical models in tubes of various diameters. (Author)

  • Supplemental Notes:
    • Rept. on Proj. Transport. See also PB-173 647.
  • Corporate Authors:

    Massachusetts Institute of Technology

    Engineering Projects Laboratory
    Cambridge, MA  United States 
  • Authors:
    • Gouse, SWJ
    • Nwude, J
  • Publication Date: 1966-12-6

Media Info

  • Pagination: 59 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00039029
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DSR-76108-1
  • Contract Numbers: C85-65ct
  • Files: TRIS
  • Created Date: Nov 24 1973 12:00AM