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 10 000

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.