Abstract
Particle Image Velocimetry (PIV) technology is used in current paper to investigated turbulent flow of central blocked accidents in a heated rectangular channel. Proper Orthogonal Decomposition (POD) method and Power Spectral Density (PSD) method are also used to expose the turbulent characteristics in the wake. The velocity field at different Reynolds numbers and blockage ratios is analyzed. During the blockage experiments, the movement of eddies are captured in detail in the instantaneous flow field. The vortex gradually decreases with the increase of Reynolds number, but gradually increases with the increase of blockage ratio. The dominant vortex structures in the first two POD modes gradually become sharper at higher blockage ratio. Subsequently, the peak frequencies of the instantaneous flow field are the same as those of POD modes at various blockage ratios.
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