Various techniques to reduce the aerodynamic drag of bluff bodies through the mechanism of base pressure recovery have been investigated. These include, for example, boat-tailing, base cavities and base bleed. In this study an Ahmed body in squareback configuration is modified to include a base cavity of variable depth, which can be ventilated by slots. The investigation is conducted in freestream and in ground proximity. It is shown that, with a plain cavity, the overall body drag is reduced for a wide range of cavity depths, but a distinct minimum drag condition is obtained. On adding ventilation slots a comparable drag reduction is achieved but at a greatly reduced cavity depth. Pressure data in the cavity is used to determine the base drag component and shows that the device drag component is significant. Modifications of the slot geometry to reduce this drag component and the effects of slot distribution are investigated. Some flow visualisation using PIV for different cavity configurations is also presented.


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    Titel :

    Bluff Body Drag Reduction with Ventilated Base Cavities


    Weitere Titelangaben:

    Sae International Journal of Passenger Cars. Mechanical Systems
    Sae Int. J. Passeng. Cars - Mech. Syst


    Beteiligte:
    Sprot, Adam (Autor:in) / Sims-Williams, David (Autor:in) / Hamlin, Fred (Autor:in) / Howell, Jeff (Autor:in) / Dominy, Robert (Autor:in)

    Kongress:

    SAE 2012 World Congress & Exhibition ; 2012



    Erscheinungsdatum :

    2012-04-16


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Bluff Body Drag Reduction with Ventilated Base Cavities

    Howell, J. / Sims-Williams, D. / Sprot, A. et al. | British Library Conference Proceedings | 2012


    Bluff body drag reduction with ventilated base cavities

    Howell,J. / Sims-Williams,D. / Sprot,A. et al. | Kraftfahrwesen | 2012


    2012-01-0171 Bluff Body Drag Reduction with Ventilated Base Cavities

    Howell, J. / Sims-Williams, D. / Sprot, A. et al. | British Library Conference Proceedings | 2012


    Longitudinal grooves for bluff body drag reduction

    Quass, B. / Howard, F. / Weinstein, L. et al. | NTRS | 1981


    Bluff Body Overflow and Drag Reduction Control

    Zhao, Min | Springer Verlag | 2021