The present paper reveals the design concept as well as results of experimental investigations, which were conducted in the early design stage of the planned AUDI Aero-Acoustic Wind Tunnel. This low-noise open-jet facility, featuring a nozzle exit area of 11 m2 and a top speed of approximately 60 m/s, enables aerodynamic as well as acoustic testing of both, full-scale and model-scale ground vehicles. Ground simulation is provided by means of a moving-belt rig. The surrounding plenum is designed as a semi-anechoic chamber to simulate acoustic free-field conditions around the vehicle. Fan noise will be attenuated below the noise level of the open jet.The work reported herein, comprises 1/8-scale pilot-tunnel experiments of aerodynamic and acoustic configurations which were carried out at the University of Darmstadt. One of the primary goals was minimisation of collector induced broad-band noise and avoidance of discrete frequency open-jet excitations due to shear layer impingement on the collector. Furthermore, the pressure distribution along the empty test section and its pressure-loss had to be optimized. To match these requirements, a relatively long test section and a large collector appeared to be especially advantageous. Extensive experimental investigations were conducted to optimize the collector's aerodynamic as well as acoustic performance. The results suggested a test-section length of 10 m (=3.1 hydraulic nozzle diameters) and a funnel-type collector featuring a collector-to-nozzle area of about 3.7. Tests with models in the test section showed that even with a blockage ratio of 18 %, reliable aerodynamic data can be obtained. It was found that pressure distributions along comparison models, taken in a large tunnel at low blockage (1.9 %), could be reproduced satisfactorily, if the model was positioned at about 40 % of the test-section length.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Audi Aero-Acoustic Wind Tunnel


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Ewald, Bernd (Autor:in) / Mattern, Christof (Autor:in) / Wickern, Gerhard (Autor:in) / Wiedemann, Jochen (Autor:in)

    Kongress:

    International Congress & Exposition ; 1993



    Erscheinungsdatum :

    1993-03-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Audi-Aero-Acoustic Wind Tunnel

    Wiedemann, J. / Wickern, G. / Ewald, B. et al. | British Library Conference Proceedings | 1992


    Audi aero-acoustic wind tunnel

    Wiedemann,J. / Wickern,G. / Ewald,B. et al. | Kraftfahrwesen | 1993


    Hyundai full scale aero-acoustic Wind tunnel

    Kim,M.S. / Lee,J.H. / Kee,J.D. et al. | Kraftfahrwesen | 2001


    Hyundai Full Scale Aero-acoustic Wind Tunnel

    Chang, Jin-Hyuck / Kee, Jung-Do / Lee, Jung-Ho et al. | SAE Technical Papers | 2001


    Hyundai full scale aero-acoustic wind tunnel

    Kim,M.S. / Lee,J.H. / Kee,J.D. et al. | Kraftfahrwesen | 2002