THE AERODYNAMIC CHARACTERISTICS OF A VEHICLE TRAVELING IN A TUNNEL OF FINITE LENGTH

The experimental study investigates the dependence of the drag coefficient of a vehicle, moving coaxially with uniform linear velocity through a solid wall tube of finite length, on the ratio of the relative velocity of the induced fluid pushed ahead of the vehicle to the absolute velocity of the vehicle. An apparatus was built with a vertical acrylic test tube, 25 ft. high and 1.732 in. inside diameter. The tube was provided with water flow of different negative and positive pressure gradients. Drop tests were conducted using models with smooth surface, in the form of cylinders with a streamlined nose and conical tail. The mode of variation of the drag coefficient with the velocity ratio at model Reynolds number of 100,000 was experimentally established for the test parameters. (Author)

• Corporate Authors:

  Carnegie Institute of Technology

  Department of Mechanical Engineering
  Pittsburgh, PA  United States 
• Authors:
  • Gouse, SWJ
  • Wali, E
• Publication Date: 1970-10

Media Info

• Pagination: 93 p.

Subject/Index Terms

• TRT Terms: Aerodynamics; Coefficients; Cylindrical bodies; Drag; Drop tests; Ground vehicles; Highway traffic; Mathematical models; Pneumatic conveyors; Ratios; Reynolds number; Tests; Tubing; Tunnels; Vehicular tunnels
• Uncontrolled Terms: Model tests
• Old TRIS Terms: Aerodynamic characteristics; Drop tests hydraulic test tunnels; Hydraulic test tunnels; Scale ratio; Tube vehicles; Vehicular traffic; Vertical test tunnels
• Subject Areas: Bridges and other structures; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00039218
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: CMU-59095-1 Final Rpt
• Contract Numbers: DOT-FR-0007
• Files: TRIS
• Created Date: Nov 24 1972 12:00AM