Proceedings of the International scientific and practical conference ―Toronto Congress of Advanced Research‖ (April 20-22, 2026) / Publisher website: www.naukainfo.com. – Toronto, Canada, 2026. - 174 p.

169 narrowing area. Near the curtain, the colored liquid, moving outward from the model flow-directing structure, is also transported from the near-surface layer of the flow to its bottom. The colored liquid then slowly moves along the channel bottom toward the dam, indicating that the water flow before the flow-directing structure is circulating. This transverse circulation flow with an axis directed parallel to the direction of the screen is especially clearly manifested in the deep part of the structure (sections 12-18). Simultaneously with flow visualization, flow velocity measurements were taken above the dam and within the hydrodynamic flume using dynamic pressure sensors and hot-film anemometers, as shown in Fig. 2a. Based on flow velocity measurements in the flume, the water flow rate in the flume was determined, which was equal to the flow rate in the hydrodynamic channel. This flow rate was used to calculate the average flow velocity above the dam. During the experimental researches, the average flow velocity above the dam of the jet-directing screen model varied from 0.06 m/s to 0.2 m/s, which corresponded to actual average flow velocities of 0.3 m/s to 1 m/s or from 0.7U max to 2.3U max , where U max =0.44 m/s is the flow velocity above the dam for the maximum flow rate in the warm compartment. a b Fig. 3. Velocity fields behind the entrance dam in the near-surface layer (a) and in the bottom layer (b). Typical examples of velocity distribution above the dam and near the screen web of the jet-directing structure model are shown in Fig. 3 for the average discharge