Notchback models generally have more complicated flow patterns than box models. This leads to intricate influence of rear geometry of Notchback on aerodynamic drag. Therefore, based on understanding of wake structure, flow phenomena for reducing the drag can be analyzed. This paper analyzes the influence of geometry of rear portion on the drag by means of 1/5 scale notchback models. For fastback models at certain critical angle of the rear window the drag shows a sharp peak. For notchback models, it is found that some combination of the angle of rear window and the height of trunk deck shows simillar maximum in the drag. Moreover, the flow visualization and the detailed measurements of velocity fluctuation clarify typical vortex patterns of wake, which are an arch-type vortex behind the rear window and the trailing vortex behind the trunk deck. These vortex patterns are similar to the numerical flow patterns obtained by the direct integration of the unsteady, incompressible Navier-Stokes equations. As a result, it is found that an effective configuration parameter on aerodynamic drag is related to wake patterns.


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    Titel :

    Analysis of wake pattern for reducing aerodynamic drag of notchback model


    Weitere Titelangaben:

    Untersuchung der Wirbelschleppe zur Minderung des Luftwiderstands bei Modellen mit Stufenheck


    Beteiligte:
    Nouzawa, T. (Autor:in) / Haruna, S. (Autor:in) / Hiasa, K. (Autor:in) / Nakamura, T. (Autor:in) / Sato, H. (Autor:in)

    Erschienen in:

    SAE-Papers ; Mar ; 1-9


    Erscheinungsdatum :

    1990


    Format / Umfang :

    9 Seiten, 14 Bilder, 8 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Analysis of wake pattern for reducing aerodynamic drag of notchback model

    Nouzawa,T. / Haruna,S. / Hiasa,K. Nakamura,T. et al. | Kraftfahrwesen | 1990


    Links between Notchback Geometry, Aerodynamic Drag, Flow Asymmetry and Unsteady Wake Structure

    Sprot, Adam / Marwood, David / Sims-Williams, David | SAE Technical Papers | 2011


    Links between notchback geometry, aerodynamic drag, flow asymmetry and unsteady wake structure

    Sims-Williams,D. / Marwood,D. / Sprot,A. et al. | Kraftfahrwesen | 2011



    Unsteady-Wake Analysis of the Aerodynamic Drag of a Notchback Model with Critical Afterbody Geometry

    Kawamoto, Akira / Sato, Hiroshi / Hiasa, Kazuhiko et al. | SAE Technical Papers | 1992