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Comparison of road and wind-tunnel drag reductions for commercial vehicles

Watkins, S. / Saunders, J.W. / Hoffmann, P.H.

AbstractDrag coefficient reductions arising from streamlining devices to commercial vehicles are discussed. Road and wind-tunnel tests are briefly described, including road tests to measure on-road turbulence characteristics. Comparison of drag coefficient reductions at high yaw angles shows road results that are considerably lower than tunnel results, whereas at low yaw angles the road drag reductions can be higher than those measured in the tunnel. It is shown that the effects of atmospheric turbulence (which are always present during road tests when high yaw angles are measured due to the strong crosswinds) are significant. Tunnel data obtained in grid-generated turbulence are closer to results obtained on the road under high yaw angles.

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Comparison of road and wind-tunnel drag reductions for commercial vehicles

Watkins, S. / Saunders, J.W. / Hoffmann, P.H.

AbstractDrag coefficient reductions arising from streamlining devices to commercial vehicles are discussed. Road and wind-tunnel tests are briefly described, including road tests to measure on-road turbulence characteristics. Comparison of drag coefficient reductions at high yaw angles shows road results that are considerably lower than tunnel results, whereas at low yaw angles the road drag reductions can be higher than those measured in the tunnel. It is shown that the effects of atmospheric turbulence (which are always present during road tests when high yaw angles are measured due to the strong crosswinds) are significant. Tunnel data obtained in grid-generated turbulence are closer to results obtained on the road under high yaw angles.

Comparison of road and wind-tunnel drag reductions for commercial vehicles

Watkins, S. / Saunders, J.W. / Hoffmann, P.H.

AbstractDrag coefficient reductions arising from streamlining devices to commercial vehicles are discussed. Road and wind-tunnel tests are briefly described, including road tests to measure on-road turbulence characteristics. Comparison of drag coefficient reductions at high yaw angles shows road results that are considerably lower than tunnel results, whereas at low yaw angles the road drag reductions can be higher than those measured in the tunnel. It is shown that the effects of atmospheric turbulence (which are always present during road tests when high yaw angles are measured due to the strong crosswinds) are significant. Tunnel data obtained in grid-generated turbulence are closer to results obtained on the road under high yaw angles.

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Title:

Comparison of road and wind-tunnel drag reductions for commercial vehicles

Contributors:

Watkins, S. (author) / Saunders, J.W. (author) / Hoffmann, P.H. (author)

Published in:

Journal of Wind Engineering and Industrial Aerodynamics ; 49 ; 411-420

Publication date:

1993-01-01

Size:

10 pages

ISSN:

DOI:

https://doi.org/10.1016/0167-6105(93)90035-M

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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