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Unsteady Aerodynamics of Nonslender Delta Wings


Reference:

Gursul, I., Gordnier, R. and Visbal, M., 2005. Unsteady Aerodynamics of Nonslender Delta Wings. Progress in Aerospace Sciences, 41 (7), pp. 515-557.

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    Official URL:

    http://www.sciencedirect.com/science/journal/03760421

    Abstract

    Unsteady aerodynamics of nonslender delta wings, covering topics of shear layer instabilities, structure of nonslender vortices, breakdown, maneuvering wings, and fluid/structure interactions, are reviewed in this paper. Vortical flows develop at very low angles of attack, and form close to the wing surface. This results in strong interactions with the upper-surface boundary layer and in a pronounced dependence of the flow structure on Reynolds number. Vortex breakdown is observed to be much less abrupt compared to breakdown over slender wings. This results in challenges for the precise determination of vortex breakdown location and the interpretation of flow visualizations. One of the distinct features of nonslender wings is the location of the primary attachment zone outboard of the symmetry plane. Reattachment location correlates with the wing stall process and increased buffeting. Dramatic fluid/structure interactions emerge with increasing wing flexibility and result in substantial lift enhancement in the post-stall region. This recently discovered phenomenon appears to be a feature of nonslender wings. Rigid delta wings undergoing small amplitude oscillations in the post-stall region exhibit many similarities to flexible wings, including reattachment and re-formation of the leading-edge vortices. Unusual self-excited roll oscillations have also been observed for free-to-roll nonslender wings.

    Details

    Item Type Articles
    CreatorsGursul, I., Gordnier, R. and Visbal, M.
    DOI10.1016/j.paerosci.2005.09.002
    DepartmentsFaculty of Engineering & Design > Mechanical Engineering
    RefereedYes
    StatusPublished
    ID Code411

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