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On-Road and Wind Tunnel Turbulence and its Measurement Using a Four-Hole Dynamic Probe Ahead of Several Cars
Technical Paper
2000-01-0350
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
SAE 2000 World Congress
Language:
English
Abstract
On-road measurements combined with a review of the literature suggest that it is rare for cars to travel in turbulence intensities less than 1%. It is typically 3%-5%. In an open, unobstructed environment, the length scale ranges from 2-17 m (average = 7 m). Alternatively, the presence of upstream motor cars reduce the length scales to 0.5-1.5 m (average = 1.2 m), but the cars increase the turbulence intensity from 5% to 20%. The placement of a similar size car one body length upstream in a wind tunnel presents an environment for aero-acoustic noise testing and perhaps other aerodynamic testing that is more typical of average freeway conditions than is normally found in most wind tunnels.
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Authors
Citation
Saunders, J. and Mansour, R., "On-Road and Wind Tunnel Turbulence and its Measurement Using a Four-Hole Dynamic Probe Ahead of Several Cars," SAE Technical Paper 2000-01-0350, 2000, https://doi.org/10.4271/2000-01-0350.Also In
SAE 2000 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V109-6; Published: 2001-09-15
Number: V109-6; Published: 2001-09-15
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