Wind-Tunnel Modelling off Commercial Vehicle Drag-Reducing Devices: Three Case Studies

870717

01/20/1987

Event
Autotechnologies Conference and Exposition
Authors Abstract
Content
Road and wind-tunnel tests are presented which examine the drag coefficient reductions from aerodynamic devices fitted to three trucks.
A modified SAE Type II procedure utilising an instrumented chase car, evaluated on-road, constant-speed drag reductions as a function of yaw angle. At 100 km/h, turbulence intensities of 1% - 4% were measured.
The wind-tunnel results generally overestimated drag savings, particularly at high yaw angles. This was greater for cabin deflectors than for solid fairings. Simulating higher turbulence intensities gave improved agreement and it is argued that turbulence is a dominant modelling parameter.
Meta TagsDetails
DOI
https://doi.org/10.4271/870717
Pages
10
Citation
Watkins, S., Saunders, J., and Hoffman, P., "Wind-Tunnel Modelling off Commercial Vehicle Drag-Reducing Devices: Three Case Studies," SAE Technical Paper 870717, 1987, https://doi.org/10.4271/870717.
Additional Details
Publisher
Published
Jan 20, 1987
Product Code
870717
Content Type
Technical Paper
Language
English