AN INVESTIGATION OF DRAG REDUCTION FOR TRACTOR TRAILER VEHICLES
Force and moment data were obtained from a one-twenty-fifth scale wind tunnel model of a cab-over-engine tractor trailer combination. The tests define the aerodynamic characteristics of the baseline (unmodified) vehicle and several modified configurations. The primary modifications consist of: (1) greatly increased forebody corner radii, (2) a smooth fairing over the cab-to-trailer gap, (3) a smoothed underbody, and (4) rear streamlining (boattailing)of the trailer. Tests were conducted for yaw angles from 0 deg to 30 deg. The reduction in drag, relative to the baseline, obtained by combining the modifications are compared for the zero yaw condition with full scale coast down drag results for similar configurations. The drag reductions obtained from the model and full scale tests are in good agreement.
Center for Research, IncorporatedKansas University, 2385 Irving Road
Lawrence, KS United States 66045
- Muirhead, V U
- Publication Date: 1978-10
- Pagination: 62 p.
- TRT Terms: Admixtures; Aerodynamics; Drag; Reynolds number; Streamlining; Trailers; Wind tunnels
- Old TRIS Terms: Aerodynamic characteristics; Boattails; Drag reduction
- Subject Areas: Highways; Vehicles and Equipment;
- Accession Number: 00186587
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NASA-CR-144877 Final Rpt.
- Contract Numbers: NSG-4009
- Files: TRIS
- Created Date: Feb 27 1979 12:00AM