Experimental research of gravitational instability and turbulization of flow at the noble gases interface

A special type of turbulence - gravitational turbulence appears at the interface of media having different densities under nonstationary motion because of Taylor instability. This phenomenon takes place, for example, when nonstationary shockwaves pass through nonhomogeneous media. Theoretical description of the development of small interface perturbations is of no difficulty but in the process of experimental work it came out, that the growth of finite perturbations, comparable with the wave length, leads to the distortion of their initial form and complicates the analytical examination of this problem. Gravitational turbulent mixing theoretical research made by Belyenkii and Fradkin and some other authors is of semi-empirical character. In some works gravitational instability numerical research on the ground of Euler nonstationary equations with two spatial variables was carried out. Experimentally this problem is also poorly investigated. There are few works devoted to this question. The aim of this work is the experimental research of turbulization process of interface perturbations for gases having different densities under the influence of the strong decelerating shockwave under the condition of essential compressibility of initial substance. The noble gases choice was made in terms of the equality of their adiabatic compressibility. This sufficiently simplifies the experimental analysis