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

Sasidharan, V and Duvvuri, S (2021) Large- And small-amplitude shock-wave oscillations over axisymmetric bodies in high-speed flow. In: Journal of Fluid Mechanics .

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Abstract

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 a hypersonic wind tunnel at Mach number. The flow and shock-wave dynamics is dictated by two non-dimensional geometric parameters presented by the three length scales of the body, two of which are associated with the conical forebody and one with the base. Time-resolved schlieren imagery from these experiments reveals the presence of two disparate states of shock-wave oscillations in the flow, and allows for the mapping of unsteadiness boundaries in the two-parameter space. Physical mechanisms are proposed to explain the oscillations and the transitions of the shock-wave system from steady to oscillatory states. In comparison with the canonical single-parameter problem of shock-wave oscillations over spiked-blunt bodies reported in literature, the two-parameter nature of the present problem introduces distinct elements to the flow dynamics. © The Author(s), 2021. Published by Cambridge University Press.

Item Type:	Journal Article
Publication:	Journal of Fluid Mechanics
Publisher:	Cambridge University Press
Additional Information:	The copyright for this article belongs to Cambridge University Press
Keywords:	Wind tunnels, Axisymmetric bodies; Distinct elements; High speed flows; Hypersonic wind tunnels; Oscillatory state; Physical mechanism; Shock wave oscillation; Shock-wave dynamics, Shock waves
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	24 Mar 2021 09:22
Last Modified:	24 Mar 2021 09:22
URI:	http://eprints.iisc.ac.in/id/eprint/68530

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