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.


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    Title :

    The effect of a moving floor on wind-tunnel simulation of road vehicles


    Additional title:

    Der Einfluss eines beweglichen Bodens auf die Windkanalsimulation von Strassenfahrzeugen


    Contributors:
    Bearman, P.W. (author) / DeBeer, D. (author) / Hamidy, E. (author) / Harvey, J.K. (author)

    Published in:

    SAE-Papers ; Mar ; 1-15


    Publication date :

    1988


    Size :

    15 Seiten, 14 Bilder, 14 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The effect of a moving floor on wind-tunnel simulation of road vehicles

    Bearman,P.W. / Beer,D.De / Hamidy,E. et al. | Automotive engineering | 1988


    The Effect of a Moving Floor on Wind-Tunnel Simulation of Road Vehicles

    De Beer, D. / Hamidy, E. / Harvey, J. K. et al. | SAE Technical Papers | 1988




    Developments in Wind Tunnel Testing of Road Vehicles

    Carr, G. W. / Royal Aeronautical Society | British Library Conference Proceedings | 1997