Phase-Averaged Method Applied to Periodic Flow Between Shrouded Co-Rotating Disks

This study investigates the coherent flow fields between co-rotating disks in a cylindrical enclosure. By using two laser velocimeters and a phase-averaged technique, the vortical structures of the flow could be reconstructed and their dynamic behavior was observed. The experimental results reveal clearly that the flow field between the disks is composed of three distinct regions: an inner region near the hub, an outer region, and a shroud boundary-layer region. The outer region is distinguished by the presence of large vortical structures. The number of the vortical structures corresponds to the normalized frequency of the flow.