Audi has consistently advanced the aerodynamic properties of the B-series from one model generation to the next. The new Audi A4 achieves an outstanding ranking with a drag coefficient of cd 0.27. The aerodynamic drag has fallen by between 3 % and 5 %. In this paper the exterior vehicle surfaces are described. The development of the basic form has been carried out with the aid of numerical 3D airflow simulation (CFD), thus making it possible to investigate and evaluate thoroughly every draft produced y the Design department in the early styling phase. A lot of attention has been given to streamline design in the area around the rain gutter/A-pillar(wing mirror). The second greatest potential improvement has been found on the underside of the vehicle. The underbody airflow accounts for 40 % of the drag. Measures were wheel spoilers, covers smoothing the mid-section of the underflow, spoiler edges a the end of the mid-section of the underfloor and the tunnel, cover panels stretching back as far as the rear wheels. 3D engine compartment airflow simulations were carried out to analyse the cooling airflow in detail. Design measures to reduce wind noise are outlined. Audi has concentrated on seal concept, bodywork insulation, door design, windscreen wipers, A-pillar airflow.


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    Title :

    Aerodynamics and Aeroacoustics


    Contributors:

    Published in:

    Automobiltechnische Zeitschrift - ATZ ; 109 , Sh: The New Audi A4 ; 44-49


    Publication date :

    2007


    Size :

    6 Seiten, 11 Bilder



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    German