Shock front instabilities in conical waveguides

A special case of the double Mach reflection (DMR) is used to describe complex shock structure in explosively driven plasma (EGP) systems containing a converging conical waveguide. Modeling efforts show a convex primary Mach stem is formed as a result of unstable slip stream jetting along the wavegu...

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Bibliographic Details
Main Author: Giannuzzi, Paul
Format: Conference Proceeding
Language:English
Subjects:
Argon
Backlights
Contact angle
Convergence
Detonation
Fluid flow
Mach reflection
Two dimensional jets
Waveguides
Working fluids
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Summary:A special case of the double Mach reflection (DMR) is used to describe complex shock structure in explosively driven plasma (EGP) systems containing a converging conical waveguide. Modeling efforts show a convex primary Mach stem is formed as a result of unstable slip stream jetting along the waveguide wall. The convex portion of the Mach stem is shown to develop as soon as the curved detonation front interacts with the waveguide wall. As the Mach stem grows, a large turbulent flow region follows the primary Mach stem. Results demonstrate that this toroidal flow region is in close contact to the shock front with air and argon in the waveguide. After the convex region of the Mach stem fully forms, a linear section of the Mach stem will form connecting the incident shock to the convex section of the Mach stem. Both self-lit and high power backlight methods are used to visualize the shock front structure in air and argon. A 2D test section with angled wedge is used to approximate the shock structure in 3D EGP systems. While the convex DMR shape is observed in systems with air working fluid, a more stable slip stream jet is observed in argon filled systems which does not detach from the wedge.
ISSN:0094-243X
1551-7616
DOI:10.1063/12.0032460