This research focuses on the analysis of the instability of passenger vehicles associated with transient crosswind gusts. A new vehicle model, created to analyze the behavior of unsteady wakes on bluff bodies, is proposed. The tests presented here were performed on a squareback model animated by an oscillating yaw angle in a steady wind. The initial unsteady results were obtained for a yaw angle of 10°, a Reynolds number close to 106, and a maximum value of the Strouhal number of 0.07. The analysis of unsteady total-pressure tomographies and unsteady particle-image velocimetry (PIV) shows the presence of phase shifting and hysteresis that evolve as a function of the Strouhal number. This work was performed in the framework of a collaboration between the Conservatoire National des Arts et Métiers, (CNAM), the Ecole Nationale Supérieure de l’Aéronautique et de l’Espace (SUPAERO) and the European automotive constructor Peugeot Citroën SA.


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    Title :

    Experimental Study of Unsteady Wakes Behind an Oscillating Car Model


    Additional title:

    Sae Technical Papers


    Contributors:
    Strzelecki, A. (author) / Chometon, F. (author) / Dechipre, H. (author) / Gohlke, M. (author) / Dufour, P. C. (author) / Ferrand, V. (author) / Herbert, V. (author)

    Conference:

    SAE 2005 World Congress & Exhibition ; 2005



    Publication date :

    2005-04-11




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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