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

• DOI: 10.1017/jfm.2021.115
• Publication Date: 2021-03-03T12:16:51Z
• Authors: Vaisakh Sasidharan; Subrahmanyam Duvvuri
• Keywords: 0103 physical sciences; Fluid Dynamics (physics.flu-dyn); FOS: Physical sciences; Physics - Fluid Dynamics; 01 natural sciences

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.