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NUMERICAL INVESTIGATION OF TOPOLOGY AND OPTICS OF MULTIPHASE FLOW PAST A SPHERE

DOI: 10.1615/ICHMT.2008.CHT.1960
14 pages

Eduard Borisovich Vasilevskii
Central Aerohydrodynamic Institute, Zhukovsky Moscow region, Russia

Alexey Borisovich Miller
Central Aerohydrodynamic Institute, Zhukovsky, Moscow region, Russia, 140180

Galina Vasilievna Molleson
Central Aerohydrodynamic Institute, Zhukovsky, Moscow region, Russia, 140180

Al'bert Leonidovich Stasenko
Central Aerohydrodynamic Institute, Zhukovsky, Moscow region, Russia, 140180

Abstrakt

There are many problems arising in the interaction of a high-speed dusty flow with a blunted body which are essential for many areas of the human practice (entry into dusty planet atmospheres, technology of a thin covering with intrusion of particulates etc.). In laboratory investigations of these processes (for example, evaluation of the spatial distribution of particles near a body surface), optical methods are being used, and the resulting radiation scattered by the particulate material is being measured by Vasilevskii [2004].
Physico-mathematical model of the spatial distribution of the gas - particle flow parameters in the shock layer near a sphere, and results of their numerical investigation are presented with input data typical for an experiment in a supersonic wind tunnel. Non-equilibrium dynamics and thermodynamics of the phases are taken into consideration, as well as the reverse influence of the mono-disperse phase upon the carrying gas. The gas is described in the frame of an Euler model combined with Mendeleyev-Chaperon equation of state. Influence of the relative particles' mass rate and their radii upon two-phase flow is numerically investigated. The role of radiation scattered by the surface of a streamlined body, illuminated with a monochromatic laser sheet, upon the total optical signal (registered to measure the micro-particulate local concentration in the shock layer), is studied. The radiation scattered by the sphere surface coincides qualitatively with the experimental observations. This comparison shows the necessity to take into consideration the radiation scattered by the sphere surface itself.

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