Shock tube experiments on the three-layer Richtmyer-Meshkov instability
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Department of Aerospace and Mechanical Engineering, University of ArizonaIssue Date
2024-01-30
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American Institute of Physics Inc.Citation
M. Schalles, C. Louie, K. Peabody, J. Sadler, Y. Zhou, J. Jacobs; Shock tube experiments on the three-layer Richtmyer–Meshkov instability. Physics of Fluids 1 January 2024; 36 (1): 014126. https://doi.org/10.1063/5.0179296Journal
Physics of FluidsRights
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This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
A vertical shock tube is used for experiments on the three-layer Richtmyer-Meshkov instability. Two closely spaced membrane-less interfaces are formed by the flow of two different sects of three gases: one with air above CO2 above SF6 and the other with helium above air above SF6. The lightest of the three gases enters the shock tube at the top of the driven section and flows downward. Conversely, the heaviest gas enters at the bottom of the shock tube and flows upward while the intermediate density gas enters at the middle through porous plates. All three gases are allowed to escape through holes at the layer location, leaving an approximately 30-mm layer of intermediate-density gas suspended between the lightest gas from above and the heaviest gas from below. A single-mode, two-dimensional initial perturbation is then imposed on the lower interface by oscillating the shock tube in the horizontal direction. The flow is visualized by seeding the intermediate gas with particles and illuminating it with a pulsed laser. Image sequences are then captured using high-speed video cameras. Perturbation amplitude measurements are made from the three-layer system and compared with measurements from 2, two-layer systems. It is observed that the presence of the upper, initially flat interface produces a decrease in growth of instability amplitude in the nonlinear phase over an equivalent single-interface configuration. © 2024 Author(s).Note
12 month embargo; first published 30 January 2024ISSN
1070-6631Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.1063/5.0179296