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Journal of Applied Mechanics and Technical Physics

2021 year, number 1

Numerical Simulation of Instability Development at the Interfaces in a Three-Layer Gas System: Comparison with Experimental Data

A. E. Bol'shakova, V. V. Zmushko, N. V. Nevmerzhitskii, A. N. Razin, E. D. Sen'kovskii, E. A. Sotskov
Russian Federal Nuclear Center, Sarov, 607188 Russia
Keywords: three-layer gas system, interfaces, shock waves, instability, turbulent mixing, mathematical modeling

Abstract

This paper presents the results of experimental and computational studies of instability development and mixing at the interfaces between gases of different densities. It is shown that instability and mixing at two interfaces of a three-layer gas systems arise after the interfaces are pass by a shock wave with a Mach number M = 1.3 which is formed on the left end and moves along the tube. Two experiments were carried out, in the first of which the central layer was filled with a heavy gas (SF6 gas), and in the second experiment, it was filled with a light gas (helium). On the left and right of the central layer is air at atmospheric pressure. The results obtained are compared.