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Shock-Induced Mixing in Layered Media.

#1315


Modeling of Shock-Induced Mixing in Layered Media.

Tech Area / Field

  • PHY-NGD/Fluid Mechanics and Gas Dynamics/Physics

Status
3 Approved without Funding

Registration date
26.07.1998

Leading Institute
Krzhizhanovsky Energetics Institute, Russia, Moscow

Supporting institutes

  • VNIITF, Russia, Chelyabinsk reg., Snezhinsk

Collaborators

  • AWE, UK, Aldermaston\nCNRS / Institut Universitaire des Systemes Thermiques Industriels, France, Marseille

Project summary

The main project objectives are:
— to determine the conditions for minimization of the mixing excited by a shock propogation through a system of layered media, consisting of alternate gaseous layers of differing densities;
— to determine the mechanism of mixing reduction in these media;
— to elaborate computer codes simulating mixing processes occured under the influence of a shock propogation through layered media including their experimental testing;
— optimization of ICF targets to minimize fuel-ablator mixing.

As a whole this project is directed at solving the problem of the mixing minimization in ICF targets. The work includes a series shock-tube experiments on a shock wave transition from gas A to gas C through intermediate gas B. The shape and thickness L of the shock-compressed layer separating shock-compressed flows of gases A and C are determined in the experiments for different A/B and B/C boundary shapes and thicknesses L0 of the initial intermediate layer of gas B, density distributions (ABC, ABC etc.), density ratios A/B, B/C on A/B and B/C boundaries prior to a shock arrival.

Simultaneously with the experimental work, computer codes to simulate shock propogation through layered media are elaborated. Simulations of main experimental regimes are carried out.

In a preliminary study performed at Krzhizhanovsky Power Engineering Institute a new phenomenon has been found, namely, suppression of the Richtmyer-Meshkov hydrodinamical instability, i.e. a shock passage from gas A to gas C through intermediate layer of gas B is accompanied by a nearly two-fold reduction of thickness L between shock-compressed flows of gases A and C, as compared to the shock transition from gas A directly into gas C (A.N.Aleshin, E.V.Lazareva, S.V.Sergeev, S.G.Zaytsev “On the problem of the Richtmyer-Meshkov Instability Suppression” submitted to Doklady Akademii Nauk).

On the final stage of the project, the experimentally proven results of simulations of shock propagation through layered media will be used in analysis of ICF targets compression.

Participating in works under the project weapons scientists and engineers experienced in treatment with military ICF objects will assist to changing their activity for peaceful purposes such as energy production.


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