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Convergent Richtmyer–Meshkov instability of light gas layer with perturbed outer surface

Published online by Cambridge University Press:  17 December 2019

Jianming Li
Advanced Propulsion Laboratory, Department of Modern Mechanics,University of Science and Technology of China, Hefei230026, China
Juchun Ding*
Advanced Propulsion Laboratory, Department of Modern Mechanics,University of Science and Technology of China, Hefei230026, China
Ting Si
Advanced Propulsion Laboratory, Department of Modern Mechanics,University of Science and Technology of China, Hefei230026, China
Xisheng Luo
Advanced Propulsion Laboratory, Department of Modern Mechanics,University of Science and Technology of China, Hefei230026, China
Email address for correspondence:


The Richtmyer–Meshkov instability of a helium layer surrounded by air is studied in a semi-annular convergent shock tube by high-speed schlieren photography. The gas layer is generated by an improved soap film technique such that its boundary shapes and thickness are precisely controlled. It is observed that the inner interface of the shocked light gas layer remains nearly undisturbed during the experimental time, even after the reshock, which is distinct from its counterpart in the heavy gas layer. This can be ascribed to the faster decay of the perturbation amplitude of the transmitted shock in the helium layer and Rayleigh–Taylor stabilization on the inner surface (light/heavy) during flow deceleration. The outer interface first experiences ‘accelerated’ phase inversion owing to geometric convergence, and later suffers a continuous deformation. Compared with a sole heavy/light interface, the wave influence (interface coupling) inhibits (promotes) growth of instability of the outer interface.

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© 2019 Cambridge University Press

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