Experiments on the aerodynamics of a cambered airfoil in ground effect

M. R. Ahmed, T. Takasaki, Y. Kohama

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    4 Citations (Scopus)

    Abstract

    The flow characteristics over a NACA4412 airfoil are studied in a low turbulence wind tunnel with moving ground simulation at a Reynolds number of 3.0 × 105 by varying the angle of attack from 0° to 10° and ground clearance of the trailing edge from five percent of chord to hundred percent. The pressure distribution on the airfoil surface was obtained, velocity survey over the surface was performed, wake region was explored, and lift and drag forces were measured. To ensure that the flow is 2-D, PIV measurements were performed. A strong suction effect on the lower surface at an angle of attack of 0° at the smallest ground clearance caused laminar separation well ahead of the trailing edge. Interestingly, for this airfoil, a loss of upper surface suction was recorded as the airfoil approached the ground for all angles of attack. For angles up to 4°, the lift decreased with reducing ground clearance, while for higher angles, it increased due to higher pressure on the lower surface. The drag was higher close to the ground for all angles investigated mainly due to the modification of the lower surface pressure distribution.

    Original languageEnglish
    Title of host publicationCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
    PublisherAmerican Institute of Aeronautics and Astronautics Inc.
    Pages3132-3148
    Number of pages17
    ISBN (Print)1563478072, 9781563478079
    DOIs
    Publication statusPublished - 2006 Jan 1
    Event44th AIAA Aerospace Sciences Meeting 2006 - Reno, NV, United States
    Duration: 2006 Jan 92006 Jan 12

    Publication series

    NameCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
    Volume5

    Other

    Other44th AIAA Aerospace Sciences Meeting 2006
    CountryUnited States
    CityReno, NV
    Period06/1/906/1/12

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Aerospace Engineering

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