Through numerical computations, the present authors have investigated the effect of a pair of rear pockets on a minivan. They found that the pockets generate cross-streamwise vortices that in turn reduce the aerodynamics forces on the vehicle by delaying boundary-layer flow separation. Unlike conventional VGs that are extrusive, the present pocket-shaped pair of VGs does not induce additional drag by themselves. From the computed velocity fields, it is observed that the separation point has shifted downstream on the back of a moving minivan when the rear pockets are used, and thus the pressure increases on the back of the vehicle that has the rear pockets. Owing to the principles related to the rear pockets acting as VGs, it is reasonable to apply these rear pockets to not only minivans but also other ground vehicles to reduce aerodynamic forces on them. A similar but a little higher drag reduction is achieved when the rear pockets are used on a minivan that has the rear-spoiler developed by Kim et al. (2008). The effect of pocket size on the drag reduction has been also investigated, and it was found that the reduction rate of drag force increases as the pocket gets larger until it reaches a maximum value about 2.8% when the large pocket size listed in equation (9) is used.


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    Titel :

    Reduction of aerodynamic forces on a minivan by a pair of vortex generators of a pocket type


    Beteiligte:
    Kim, Inchul (Autor:in) / Chen, Hualei (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2010


    Format / Umfang :

    17 Seiten, 7 Bilder, 5 Tabellen, 7 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch