NDLI: An investigation of drag reduction for tractor trailer vehicles with air deflector and boattail. [wind tunnel tests

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An investigation of drag reduction for tractor trailer vehicles with air deflector and boattail. [wind tunnel tests

Content Provider	NASA Technical Reports Server (NTRS)
Author	Muirhead, V. U.
Copyright Year	1981
Description	A wind tunnel investigation was conducted to determine the influence of several physical variables on the aerodynamic drag of a trailer model. The physical variables included: a cab mounted wind deflector, boattail on trailer, flow vanes on trailer front, forced transition on trailer, and decreased gap between tractor and trailer. Tests were conducted at yaw angles (relative wind angles) of 0, 5, 10, 20, and 30 degrees and Reynolds numbers of 3.58 x 10 to the 5th power 6.12 x 10 to the 5th power based upon the equivalent diameter of the vehicles. The wind deflector on top of the cab produced a calculated reduction in fuel consumption of about 5 percent of the aerodynamic portion of the fuel budget for a wind speed of 15.3 km/hr (9.5 mph) over a wind angle range of 0 deg to 180 deg and for a vehicle speed of 88.5 km/hr (55 mph). The boattail produced a calculated 7 percent to 8 percent reduction in fuel consumption under the same conditions. The decrease in gap reduced the calculated fuel consumption by about 5 percent of the aerodynamic portion of the fuel budget.
File Size	1460961
Page Count	72
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19810008436
Archival Resource Key	ark:/13960/t87h6dj2q
Language	English
Publisher Date	1981-01-01
Access Restriction	Open
Subject Keyword	Urban Technology And Transportation Aerodynamic Drag Drag Reduction Tractors Boattails Wind Tunnel Tests Trailers Fuel Consumption Wind Tunnel Models Streamlining Flow Deflection Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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