The paper reports the activity that is in progress at Pininfarina in the field of 'Unsteady Aerodynamics'. Unsteady Aerodynamics is the new frontier of car aerodynamics and aeroacoustics. There is a need from the car industry to bring the wind tunnel simulation as dose as possible to the road condition. A first step in this direction was made in 1995, when Pininfarina integrated the 'rolling road' with the balance system and provided a means to rotate the car wheels. That was certainly an important improvement of the airflow simulation for a vehicle moving on the road. However, to reproduce the real on-road flow conditions in the wind tunnel, it is necessary to do a second equally important step, i.e. to reproduce in the wind tunnel a condition of turbulent flow similar to what a vehicle usually experiences on the road. It is known from previous works that for most of the time, a road vehicle is moving in the presence of turbulent flows, generated either by some natural low-speed wind or by other vehicles moving upstream. These flow conditions are very different from the almost perfect low turbulence flow that is typical of modern full-scale automotive wind tunnels. And the resultant car flow field is different, for both the aerodynamic and the aeroacoustic standpoint. In the first part, the paper reports some considerations regarding the turbulent flows that are statistically more interesting to reproduce in the wind tunnel. Then it describes the active system built in the full-scale wind tunnel to generate a controlled level of turbulence. Finally, it deals with the measuring techniques that are used to investigate these unsteady flows and presents a few examples of aerodynamic and aeroacoustic measurements carried out in the new flow condition.


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    Titel :

    Unsteady aerodynamics at Pininfarina; Road turbulence simulation and time-dependent techniques


    Beteiligte:
    Cogotti, A. (Autor:in)


    Erscheinungsdatum :

    2003


    Format / Umfang :

    32 Seiten, 26 Bilder, 41 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch