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Drag reduction obtained by rounding vertical corners on a box-shaped ground vehicleA box-shaped ground vehicle was used to simulate the aerodynamic drag of delivery vans, trucks, and motor homes. A coast-down method was used to define the drag of this vehicle in a configuration with all square corners and a modified configuration with the four vertical corners rounded. The tests ranged in velocity from 30 miles per hour to 65 miles per hour, and Reynolds numbers ranged from 4.4 x 1,000,000 to 1.0 x 10 to the 7th power based on vehicle length. The modified configuration showed a reduction in aerodynamic drag of about 40 percent as compared to the square cornered configuration.
Document ID
19740009590
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Saltzman, E. J. (NASA Flight Research Center Edwards, CA, United States)
Meyer, R. R., Jr. (NASA Flight Research Center Edwards, CA, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1974
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-X-56023
Accession Number
74N17703
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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