旋转带肋直通道湍流流动TR-PIV实验

The mainstream averaged velocity, Reynolds stress and the reattachment point were measured in rotating ribbed channel with time-resolved particle image velocimetry(TR-PIV), and their change rule along the channel was studied. The aspect ratio of channel was 1, the blockage ratio of rib was 0.1, the Reynolds number was set to 10000, and the rotation numbers ranged from 0 to 0.52. The experimental results showed that: the flow was symmetrical in static conditions, but Coriolis force generated by rotation would greatly affect the flow. With the increase of the rotating speed, the mainflow velocity pattern was inclined to the trailing side, the vortices structure on the leading side increased, and the attachment point moved backward, while the trailing side was just the opposite, and this trend would develop along the path; the Reynolds stress near the leading side became weaker, while the trailing side became stronger, and the extreme value of the Reynolds stress along the channel was basically the same, but the region would expand downstream.