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    Effects of Repetitive Laser Energy Deposition on Supersonic Duct Flows

    Effects of Repetitive Laser Energy Deposition on Supersonic Duct Flows


    An experimental study was conducted to examine the effects of repetitive energy deposition on the supersonic flow characteristics over a duct system with a central conical compression surface. Boundary-layer separation on the compression surface could induce flow instability in pulsation and resonant modes. At subcritical operation, this flow instability became stronger and the “big buzz” phenomenon occurred. To control these undesirable operations, repetitive laser energy deposition was done with a repetition frequency of up to 60 kHz, which resulted in a reduction of flow separation on the compression surface. It was also observed that flow oscillation characteristics at the two modes were modified; total pressure inside the duct chamber was increased and the big buzz was significantly suppressed.

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    Titel :

    Effects of Repetitive Laser Energy Deposition on Supersonic Duct Flows

    Beteiligte:
    Pham, Hoang Son (Autor:in) / Myokan, Manabu (Autor:in) / Tamba, Takahiro (Autor:in) / Iwakawa, Akira (Autor:in) / Sasoh, Akihiro (Autor:in)
    Erschienen in:

    AIAA Journal ; 56 , 2 ; 542-553

    Erscheinungsdatum :

    2017-11-20

    Format / Umfang :

    12 pages

    ISSN :

    0001-1452 , 1533-385X

    DOI :

    https://doi.org/10.2514/1.J056190

    Medientyp :

    Aufsatz (Zeitschrift)

    Format :

    Elektronische Ressource

    Sprache :

    Englisch

    Schlagwörter :

    Laser Energy , Supersonic Duct Flow , Boundary Layer Separation , Flow Characteristics , Axisymmetric Flow , Internal Pressure , Static Pressure , Freestream Mach Number , Wind Tunnels , Mass Flow Rate

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