NDLI: Shear-layer instability in the Mach reflection of shock waves

Content Provider	Springer Nature Link
Author	Rubidge, S. Skews, B.
Copyright Year	2014
Abstract	The Kelvin–Helmholtz instability (KHI) is an instability that takes the form of repeating wave-like structures which forms on a shear layer where two adjacent fluids are moving at a relative velocity to one another. Such a shear layer forms in the Mach reflection of shock waves. This work focuses on experimentally visualising the presence of the KHI in Mach reflection as well as its evolution. Experimentation was performed at shock Mach numbers of 1.34, 1.46 and 1.61. Plane test pieces and parabolic profiled pieces followed by a plane section having wedge angles of 30 $$^\circ $$ and 38 $$^\circ $$ were tested. Flow field visualisation was performed with a schlieren optical system. The KHI was best visualised with the camera-side knife edge perpendicular to the shear layer (i.e. the axis of sensitivity along the length of the shear layer). The structure and growth of the instability were readily identified. The KHI forms more readily with increasing Mach number and wedge angle. Second-order Euler, and Navier–Stokes numerical simulations of the flow field were also conducted. It was found that the Euler and laminar Navier–Stokes solvers achieved very similar results, both producing the KHI, but at a much less developed state than the experimental cases. The k $$-\epsilon $$ solver, however, did not produce the instability.
Starting Page	479
Ending Page	488
Page Count	10
File Format	PDF
ISSN	09381287
Journal	Shock Waves
Volume Number	24
Issue Number	5
e-ISSN	14322153
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-07-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Kelvin–Helmholtz instability Mach reflection Shear layers Engineering Thermodynamics, Heat and Mass Transfer Fluid- and Aerodynamics Engineering Fluid Dynamics Thermodynamics Acoustics Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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