This study experimentally investigated the effects of repetitive laser energy deposition using a supersonic intake model with a central conical compression surface and a 19 × 19    mm 2 cross-sectional duct in a Mach 1.92 indraft wind tunnel: especially in the subcritical and buzz modes. A single-pulse energy deposition was observed to suppress the flow separation at the compression surface by “sweeping” a shock wave system with the thermal bubble generated by the energy deposition. The duration of the sweeping effect was approximately 160    μ s in the subcritical mode and 100 420    μ s in the buzz mode. Furthermore, repetitive deposition of laser pulse energies was observed to moderate instabilities in both modes, and it increased the pressure recovery by as much as 8%; also, the occurrence of buzz was delayed, thereby widening the stable, subcritical regime. In both modes, there was a threshold value for the laser pulse repetition frequency f L , thd , which corresponded to the duration of the sweeping effect (e.g., f thd = 6    kHz in subcritical mode). Below this frequency, the increase in the pressure was proportional to the repetition frequency; whereas above f thd , the effect per single pulse was reduced.


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    Title :

    Repetitive Energy Deposition at a Supersonic Intake in Subcritical and Buzz Modes


    Contributors:

    Published in:

    AIAA Journal ; 58 , 1 ; 107-117


    Publication date :

    2020-01-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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