Experiments were carried out on a rectangular cavity ( L / D = 4 ) to study the effects of interaction between a transient shock system and a cavity shear layer on cavity oscillations through high-speed images and unsteady pressure measurements. The interaction studies under transient conditions were carried out for the range of pressure varying from P 01 / P 0 = 0.41 to 0.63. The high-speed shadowgraph images revealed that the interaction was found to be predominant at P 01 / P 0 = 0.52 and 0.56, where the cavity pressure spectra possessed numerous modes/tones. At P 01 / P 0 = 0.41 and 0.46, the high-speed images showed virtually no interaction between transient shock and the cavity shear layer. At P 01 / P 0 = 0.59 and 0.63, the interaction was found to be minimal where limited modes/tones were experienced by the cavity. Under the fully established supersonic condition ( P 01 / P 0 = 1 ), dominant modes/tones were seen at discrete frequencies. Irrespective of the pressures ( P 01 / P 0 ), the pressure spectra inside the cavity at different locations indicated the global instability. Conversely, by increasing the pressures beyond P 01 / P 0 > 0.46 , a mode switching phenomena was observed as a consequence of transient shock interaction with the cavity shear layer. The overall sound pressure levels for these cases were found to be varied from 154 to 175 dB. The present studies indicated that the effect of transient shock interaction with the cavity shear layer needs to be accounted for in the design phase.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Onset of Transient Shock Interaction with Cavity Shear Layer


    Contributors:

    Published in:

    AIAA Journal ; 57 , 9 ; 3773-3778


    Publication date :

    2019-07-19


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English