平行二円板流入角部のはく離泡と放射流

概要

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The annular separation bubble and radial flow between two parallel disks are investigated to understand the features of flow axisymmetric separation and reattachement flow in the inlet region by means of flow visualization and numerical calculation methods. The radius of the separation bubble depends only on the clearance ratio, h/r_0, independent of Reynolds number, Re, in the turblent flow regime where the reattachment point fluctuates randomly. In the transient regime, the reattachment point oscillates periodically. In the laminar flow regime, the reattachment point is stationary, and its radius is given by a function of Re, independent of h/r_0 for h/r_0 ≲ 1.2. Development of velocity distributions to the parabolic profile is investigated at h/r_0=1.0. When Re is smaller than about 25, axisymmetrical-two-dimensional flow exists with a separation bubble between two parallel disks. Furthermore, for Re ≳ 35, a vortex occurs downstream of the separation bubble, in which counterrotating recirculations exist, and circumferentially periodic disturbance appears.
一般社団法人日本機械学会の論文
1990-05-25