Experimental unsteady centerbody surface pressures measured in a low-boom inlet have been analyzed and compared with an unsteady computational flow approach. The experimental dataset was gathered at the 8 × 6    ft supersonic wind tunnel at the NASA John H. Glenn Research Center in 2010. The axisymmetric external compression inlet considered herein featured a relaxed isentropic centerbody compression spike followed by a short subsonic diffuser to the aerodynamic interface plane. The axisymmetric inlet computational domain comprised a 10 deg sector, starting with the freestream inflow region, and included both the internal flowpath up to the mass flow plug and the external flow past the sharp-edged cowl for external flow. The selected inlet test conditions were based on a 1.67 freestream Mach number at a zero angle of attack with a near-design spillage rate of approximately 4%. Both experiments and simulations revealed temporal shifts between pressure peaks at different streamwise locations, indicating upstream-running compression waves that moved at acoustic speeds. These waves became amplified near the geometric throat and produced streamwise oscillations of the external normal shock. The simulations also revealed a second smaller shock on the centerbody at the geometric throat, for which the complex dynamics suggested an opportunity for further study.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Acoustically Induced Shock Oscillations in a Low-Boom Inlet


    Contributors:

    Published in:

    AIAA Journal ; 54 , 7 ; 2134-2148


    Publication date :

    2016-05-24


    Size :

    15 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Acoustically Induced Shock Oscillations of a Low-Boom Inlet (AIAA 2015-1048)

    Candon, Sean / Loth, Eric / Rybalko, Michael | British Library Conference Proceedings | 2015


    Acoustically optimized air inlet

    ROMANO PASCAL / BONNEAU VIRGINIE / SENSIAU CLAUDE | European Patent Office | 2018

    Free access