The flow characteristics were examined with regard to the bed geometry variation for a pickup truck experimentally and computationally. The drag coefficient was changed in accordance with the bed geometry, the bed length, and the bed height. As a result of an ANOVA in the design-of-experiments process, the interaction effect between the bed length and bed height was significant. The main aerodynamic features of a pickup truck were characterized as the bed recirculation flow over the bed and the reverse flow in the wake. The occurrence of the reverse flow in the wake was dependent on the bed geometry. The bed flow was attached to the upper part of the tailgate when the bed geometry could not cover all the downwash of the bed flow, similar to the short low bed. This attachment brought about the strong backward bed flow on the tailgate, the relatively high turbulence level over the bed, and the coherent peak of the power spectrum density in the wake so that the drag coefficient increased. The attachment disappeared and the backward bed flow was weakened as the bed became either longer or higher. The longer bed had more room to cover the downwash of the bed flow inside the bed. The higher bed kept the downwash flowing over the tailgate and led the bed flow to be recirculated inside the bed. Thus, the drag coefficient was low in spite of the reverse flow in the wake. The drag coefficient was high, however, for thelong high bed, although the bed flow was not attached to the tailgate, because the reverse flow in the wake and the adverse pressure area inside the bed were enlarged. The drag coefficient of the midlength, mid-height bed did not change markedly in comparison with those of the short mid-height bed or mid-length low bed, since the drag reduction by the weakened backward bed flow could be cancelled by the strengthened reverse flow in the wake. Consequently, the bed flow over the bed and the reverse flow in the wake affected the flow characteristics at the same time. In conclusion, it is important that the bed recirculation flow should not be attached to the tailgate. Next, the adverse pressure area inside the bed should be small, and the reverse flow in the wake should be weak in designing the bed geometry for a low-drag pickup truck.


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    Titel :

    Flow characteristics of a pickup truck with regard to the bed geometry variation


    Weitere Titelangaben:

    Strömungskenngrößen eines Pick-up-Transporters hinsichtlich der Veränderungen der Ladefläche


    Beteiligte:
    Ha, J. (Autor:in) / Jeong, S. (Autor:in) / Obayashi, S. (Autor:in)


    Erscheinungsdatum :

    2010


    Format / Umfang :

    11 Seiten, 15 Bilder, 3 Tabellen, 15 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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    Ha, J / Jeong, S / Obayashi, S | SAGE Publications | 2010


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