Large- and small-amplitude shock-wave oscillations over axisymmetric bodies in high-speed flow

The phenomena of self-sustained shock-wave oscillations over conical bodies with a blunt axisymmetric base subject to uniform high-speed flow are investigated in hypersonic wind tunnel at Mach number $M = 6$ . and dynamics is dictated by two non-dimensional geometric parameters presented the three length scales body, which associated forebody one base. Time-resolved schlieren imagery from these experiments reveals presence disparate states flow, allows for mapping unsteadiness boundaries two-parameter space. Physical mechanisms proposed explain transitions system steady oscillatory states. In comparison canonical single-parameter problem spiked-blunt reported literature, nature present introduces distinct elements dynamics.