Why is the measured maximum lift in wind tunnels dependent on the measurement method?

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    Abstract

    The present study investigates the differences in the predicted lift for a wind tunnel model from either surface pressures or side wall pressures. The investigated model is the NACA63-418 tested in the Poul la Cour tunnel. The measurements are compared with previous conducted wind tunnel campaigns for a Reynolds number of 3E6. The 3D CFD model of the wind tunnel will be used for investigating details of the flow mechanisms, and to validate assumptions and findings from the experimental data. The CFD simulations show that when the flow is attached the lift based on the side wall pressures results in almost the same lift as calculated from the surface pressures. Around the maximum lift and in the stalled region the flow is not anymore 2D. For the NACA63-418 airfoil the lift based on the side wall pressures are generally highest. The CFD simulations confirm that the method used to predict the lift from the limited side wall pressure strips in the wind tunnel is applicable.
    Original languageEnglish
    Article number032040
    Book seriesJournal of Physics: Conference Series
    Volume1618
    Issue number3
    Number of pages11
    ISSN1742-6596
    DOIs
    Publication statusPublished - 2020
    EventTORQUE 2020 - Online event, Netherlands
    Duration: 28 Sept 20202 Oct 2020
    https://www.torque2020.org/

    Conference

    ConferenceTORQUE 2020
    LocationOnline event
    Country/TerritoryNetherlands
    Period28/09/202002/10/2020
    Internet address

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