Abstract
In this paper, the change rule of flow characteristics along the ribbed square duct was investigated experimentally by two-dimensional time-resolved particle image velocimetry (TR-PIV). The Reynolds number, defined by main flow velocity(1.82m/s) and the hydraulic diameter(80mm), is set to 10000, the rotation numbers are 0, 0.13, 0.26, 0.39, 0.52, respectively. The blockage ratio and aspect ratio of the ribbed square duct are 0.1, 1 respectively. As the rotation number increased, The vortices structure on the suction side became larger and the attachment point moved backward. The situation on the pressure side was just the opposite, and this trend would develop along the duct. Furthermore, the parameters of different ribs along the duct varied greatly under the same rotation number. In the downstream ribs, the mainstream velocity pattern was more inclined to the pressure side, where the vortex structure was larger.
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