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Three-dimensional numerical simulation of flows past scoops in a gas centrifuge

Published online by Cambridge University Press:  26 April 2006

Takuya Matsuda ,
Naoki Tamura  and
Keisuke Sawada
Takuya Matsuda
Affiliation:
Department of Aeronautical Engineering, Kyoto University, Kyoto 606, Japan
Naoki Tamura
Affiliation:
Department of Aeronautical Engineering, Kyoto University, Kyoto 606, Japan
Keisuke Sawada
Affiliation:
Aircraft Engineering Division, Kawasaki Heavy Industries Ltd, Kakamigahara 504, Japan
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Abstract

Three-dimensional numerical calculations of an inviscid gas past scoops in a gas centrifuge are performed by solving the Euler equations using the explicit Roe upwind scheme with a second-order of accuracy. The scoop is modelled as a cylindrical or a wing-shaped rod attached to a central tube and extending radially outwards, and no inlet flow to the scoop is assumed. The scoops are placed close to the bottom end plate, and there is no covering baffle plate. The numerical grid employed is of the multibox type. The main results are as follows. For a cylindrical scoop, a detached bow shock is formed in front of the scoop. Behind the shock, strong radially inward motion of gas towards the central axis is induced, and it excites an upward flow which becomes a countercurrent. The inward flow just in front of the scoop produces a vortex column in the upstream region of the scoop. For a wing-shaped scoop, an oblique shock attached to the scoop is formed, and an inward flow is induced behind the shock. The shock is not so strong as that in the case of a cylindrical scoop model. The drag coefficient of the wing-shaped scoop is almost one-fourth of that of the cylindrical scoop. The addition theorem of the scoop drag is verified for the wing-shaped scoop.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 201 , April 1989 , pp. 203 - 221
Copyright
© 1989 Cambridge University Press

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