抄録
In the vaneless diffuser of centrifugal compressor or blower, the rotating stall occurs at the lower flow rate due the backflow from the diffuser. In this paper, the effect of swirl flow on the rotating stall was investigated by the three-dimensional numerical simulation. In order to investigate the effect of swirl flow on the rotating stall, the flow of rotating cylinder between the stationary disks without the rotating blades and inflow was calculated. The region of high circumferential velocity rotates with the frequency of 1.6Hz slightly higher than the frequency of 1.4Hz obtained from the experiments. The vortex found in the meridional plane between the stationary disks appears with the flow to the rotating cylinder from, and disappear with the flow to the outside.
