An experimental investigation has been conducted on swept impinging oblique shock/boundary-layer interactions at a nominal Mach number of 2.28 with a fully turbulent incoming boundary layer ( R e θ = 5500 ). The swept impinging oblique shock is induced by shock generators with x - y plane deflection angle θ = 12.5    deg and various x - z plane sweep angles ψ = 15.0 , 22.5, 30.0, and 40.0 deg. Oil flow visualization, mean pressure measurements, and high-bandwidth pressure transducers are used to provide detailed characterization of the mean and unsteady features of the shock/boundary-layer interactions. Large-scale separation is observed in all cases with spanwise growth especially evident at high shock generator sweep angles. Near the onset of separation in the central region of the tunnel (quasi-infinite span zone), mean pressures are independent of span and scale cylindrically. However, mean pressures at reattachment for higher sweep angles display mild spanwise dependence, suggesting the overall mean flow topology of the shock/boundary-layer interaction is conical. Unsteady pressure measurements beneath the separation shock foot show clear low-frequency unsteadiness, orders of magnitude below that of the incoming boundary layer. As the sweep is increased, the frequency of the separation shock motion is also increased. Specific analysis of the ψ = 30.0    deg configuration shows spanwise accelerating ripples of relatively constant frequency that propagate along the shock foot, suggesting that the wavelength of these ripples increases with span. Considerable coherence for this rippling motion is observed in the range associated with the low-frequency unsteadiness of the shock foot. Minimal influence of the incoming turbulent boundary layer on the low-frequency unsteadiness is present, suggesting an unsteadiness mechanism within the shock/boundary-layer interaction.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Experimental Study of Swept Impinging Oblique Shock/Boundary-Layer Interactions



    Published in:

    AIAA Journal ; 59 , 1 ; 140-149


    Publication date :

    2021-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Experimental Study of Swept Impinging Oblique Shock Boundary Layer Interaction

    Padmanabhan, Sathyan / Castro Maldonado, Jorge / Threadgill, James A. et al. | AIAA | 2019


    Three-Dimensional Flow Features of Swept Impinging Oblique Shock/Boundary-Layer Interactions

    Threadgill, James A. / Stab, Ilona / Doehrmann, Adam et al. | AIAA | 2017


    Three-Dimensional Flow Features of Swept Impinging Oblique Shock/Boundary-Layer Interactions (AIAA 2017-0759)

    Threadgill, James A. / Stab, Ilona / Doehrmann, Adam et al. | British Library Conference Proceedings | 2017


    Experimental Study of Unswept and Swept Oblique Shock-Turbulent Boundary Layer Interactions

    Hainsworth, Jared / Dawson, Robyn / Little, Jesse C. | AIAA | 2014


    Experimental Study of Unswept and Swept Oblique Shock-Turbulent Boundary Layer Interactions (AIAA 2014-2738)

    Hainsworth, J. / Dawson, R. / Little, J. et al. | British Library Conference Proceedings | 2014