The velocity field over a two-dimensional wing at Reynolds number of 672,000 was investigated to characterize the three-dimensional topology and evolution of the separate flow with variation of the angle of attack. Planar particle image velocimetry over the full span of the wing demonstrated that with increasing angle of attack, isolated pockets of backflow, which appeared near the trailing edge, merged and formed an asymmetric stall cell at angle of attack of 9.7°. The asymmetry was mainly associated with the dissimilar boundary layers developed on the wind tunnel walls at the spanwise ends of the wing. Secondary structures were also observed between the stall cell and the spanwise end. The stall cell topology was characterized using large-scale three-dimensional particle tracking velocimetry measurements using helium-filled soap bubbles. The results showed that the separation bubble had a small wall-normal height with two wall-normal counter-rotating vortices extended up to the edge of the separation bubble. In addition, the investigations demonstrated that vortex generators can induce a symmetric stall cell by removing the secondary structures and isolating the stall cell from the flows at the spanwise ends.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Full-Span Topology of Trailing-Edge Separation at Different Angles of Attack


    Contributors:
    Wang, Sen (author) / Ghaemi, Sina (author)

    Published in:

    AIAA Journal ; 59 , 12 ; 5186-5197


    Publication date :

    2021-12-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Wall pressure fluctuations over a serrated trailing edge at different angles of attack

    Lima Pereira, Lourenco Tercio / Avallone, Francesco / Ragni, Daniele | AIAA | 2021


    Aerodynamic Performance Modification at Low Angles of Attack by Trailing Edge Vortices

    DeSalvo, M. E. / Glezer, A. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2004