The importance of using a moving floor to simulate the flow around a passenger car in a wind tunnel is considered. Measurements on a typical 1/3 rd scale car at normal ground clearance show that floor movement reduces drag by about 8 % and reduces lift by nearly 30 %. The effect on lift is more pronounced when the vehicle is yawed to the flow. Experiments on an idealised car shape show that there is a marked effect of floor movement if the underbody has rear upsweep. However, in the near wake of a flat-based version of that model, with a straight underbody throughout, detailed velocity surveys show surprisingly little effect of floor movement. On the other hand, measurements of the structure of the wakes of a fixed wheel on a stationary floor and a rotating wheel on a moving floor show a large effect of floor movement.
The effect of a moving floor on wind-tunnel simulation of road vehicles
Der Einfluss eines beweglichen Bodens auf die Windkanalsimulation von Strassenfahrzeugen
SAE-Papers ; Mar ; 1-15
1988
15 Seiten, 14 Bilder, 14 Quellen
Conference paper
English
The effect of a moving floor on wind-tunnel simulation of road vehicles
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