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Main Title Turbulent diffusion behind vehicles : experimentally determined influence of vortex air in vehicle wake /
Author Thompson, Roger S. ; Eskridge, R. E.
Other Authors
Author Title of a Work
Eskridge, Robert E.
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Publisher U.S. Environmental Protection Agency, Atmospheric Sciences Research Laboratory,
Year Published 1987
Report Number EPA/600/J-87/479
Stock Number PB89-201842
Additional Subjects Air pollution ; Automobiles ; Wakes ; Motor vehicles ; Exhaust gases ; Exhaust emissions ; Aerodynamics ; Vortices ; Wind tunnels ; Highways ; Graphs(Charts) ; Reprints ; Automobile exhaust ; Diffusion modeling
Library Call Number Additional Info Location Last
NTIS  PB89-201842 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8 pages ; 28 cm
The wake of a moving vehicle was stimulated using a wind tunnel with a moving floor. The vehicle models, both scale and block-shaped, were held in a fixed position while the floor moved at the upstream air speed. This simulates an automobile traveling on a straight highway in still ambient air. Vertical and lateral profiles of mean and fluctuating velocities and mean tracer concentration were obtained. Profiles were taken at distances of 15-60 model heights downstream. Two exhaust source positions were used: at the center of the rear of the vehicle and on the side just behind the rear wheel. It was found that the scale vehicles induce a pair of vortices in the wake that modify the velocity and concentration patterns in a minor way from that of the block car.
"Journal article." "EPA/600/J-87/479." "Published in Atmospheric Environment, vol. 21, no. 10 pp. 2091-2097, 1987." Microfiche.