Abstract
Numerical investigation has been performed on the flows around a rotating disk in a cylindrical casing. The sizes of the disk and the casing are finite, and the flow field has a radial clearance and an axial clearance. Taylor-Couette type flow develops in the radial clearance while the rotor-stator cavity flow appears in the axial clearance, and the interaction of the flows in these clearances makes complex flow developments. The flow structures are classified into some types including normal and anomalous modes in the radial clearance and circular and polygonal vortices in the axial clearance. The effect of the acceleration rate of the disk is estimated and it is found that the gradual increase of the disk angular velocity tends to form circular vortices in the normal mode.
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