Modification of the flow separation characteristics of a laminar airfoil using a remotely located high-power laser was experimentally investigated in a low-speed, low-turbulence wind tunnel. A laminar airfoil model (chord length of 500 mm) was designed and fabricated to emulate the flight characteristics of a small aircraft. At 0 deg angle of attack, the airfoil model was determined to have an incipient laminar separation bubble on its lifting surface between 67 and 80% chord. A strong laser-induced breakdown was generated 2 mm upstream of the leading edge by focusing a collimated beam emitted from a 900 mW laser at 1064 nm through a convex lens. The high-temperature plasma generates a shock wave and a cell of heated air that travels along the airfoil lifting surface and interacts with the boundary-layer flow. Two-component particle image velocimetry was used to map the transient and steady-state flow. The hot, low-density fluid induced significant exchange of momentum between the freestream and the incipient separation zone, leading to reattached flow for a period lasting seven orders of magnitude longer than the plasma lifetime. These results show promise that laser-based energy-deposition approaches can be used for effective flow-control applications.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Boundary-Layer Separation Control Using Laser-Induced Air Breakdown


    Beteiligte:
    Bright, Alfram (Autor:in) / Tichenor, Nathan (Autor:in) / Kremeyer, Kevin (Autor:in) / Wlezien, Richard (Autor:in)

    Erschienen in:

    AIAA Journal ; 56 , 4 ; 1472-1482


    Erscheinungsdatum :

    2018-02-26


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Ramp Separation Response to Laser-Induced Breakdown Disturbed Boundary Layer at Mach 4.5

    Im, Seong-kyun / Wermer, Lydia / Baccarella, Damiano et al. | AIAA | 2016



    Wave-Front Measurements of a Supersonic Boundary Layer Using Laser Induced Breakdown

    Rennie, R. Mark / Nguyen, Minh / Gordeyev, Stanislav et al. | AIAA | 2017



    Ramp Separation Response to Laser-Induced Breakdown Disturbed Boundary Layer at Mach 4.5 (AIAA 2016-0616)

    Im, Seong-Kyun / Wermer, Lydia / Baccarella, Damiano et al. | British Library Conference Proceedings | 2016