An experimental study of fully developed flows of air in a straight rectangular duct with interrupted-plate inserts is presented. Values of the dimensionless geometric parameters, normalized with respect to the full height of the duct, are the following: width of the duct cross-section = 6.063; plate length = 1.001; plate thickness = 0.252 6; and inter-plate spacing = 1.004. The Reynolds number, based on average velocity at the minimum cross-sectional area and the hydraulic diameter, ranged from 2 000 to 30 000. Single hot-wire measurements and results, which include ensemble averaged power spectrums and Strouhal number distributions, are presented. They show repeatability, vertical and lateral symmetry at corresponding points in the central region of the duct cross-section, and spatial periodicity in successive geometrical modules.
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