A detailed investigation of aerodynamic car testing in 3/4-open-test-sections was made. Herein two main influencing variables (dimensionless length scales) could be identified: first, the relative length of the 3/4-open-test-section influences the static pressure gradient along the x-axis and, second, the relative collector area has large effects on the wake of a car. The measured values (i.e. drag) are mainly determined by a combined effect of these two parameters. The basic investigation was made in the Porsche 1:4 model-wind-tunnel with two different types of vehicles (sportscar and van) and in two different scales (1:4, 1:5). The results are garphically summarized. This diagram can predict the differences between full size open-jet-wind-tunnels. These predictions were verified by measuring Porsche production cars and the Porsche calibration car in three other automotive wind-tunnels.


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    Titel :

    Influence of test-section length and collector area on measurements in 3/4-open-jet automotive wind tunnels


    Weitere Titelangaben:

    Einfluss von Versuchsabteillaenge und Sammelbereich auf die Messungen in Automobilwindkanaelen mit 3/4 offenem Strahl


    Beteiligte:

    Erschienen in:

    SAE-Papers ; Mar ; 1-9


    Erscheinungsdatum :

    1988


    Format / Umfang :

    9 Seiten, 9 Bilder, 3 Tabellen, 9 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Influence of Test-Section Length and Collector Area on Measurements in ¾-Open-Jet Automotive Wind Tunnels

    von Schulz-Hausmann, Friedrich K. / Vagt, Jorg-Dieter | SAE Technical Papers | 1988


    Influence of test-section length and collector area on measurement in 3/4-open-jet automotive wind tunnels

    Schulz-Hausmann,F.K.von / Vagt,.J.D. / Porsche,Weissach,DE | Kraftfahrwesen | 1988


    Wall Correction Model for Wind Tunnels with Open Test Section

    Jens Sorensen / Wen Shen / Robert Mikkelsen | AIAA | 2006



    Influence of plenum dimensions on drag measurements in 3/4-open-jet automotive wind tunnels

    Deutenbach,K.R. / Bayerische Motorenwerke,BMW,Muenchen,DE | Kraftfahrwesen | 1995