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Fluctuating and Mean Hydrodynamic Forces
Published in Eduard Naudascher, Hydrodynamic Forces, 2017
Whenever there is flow of an air-water mixture through conduits or pipes, the designer is advised to carefully evaluate the system for possible agglomerations of air bubbles or generation of large air pockets which escape intermittently (Martin, 1976a, b) by travelling either with the flow (blow-out) or against the flow (blow-back). An unusual, and rather harmless, case of blow-out is illustrated in Figure 2.26. As an additional provision for controlling the flood discharge, a Tainter gate was to be installed in a conduit downstream from a cylinder gate. In an emergency when the latter becomes stuck, air-water mixture would enter the conduit, and the Tainter gate is supposed to close. With the gate still open, air cushions will form under the horizontal ceilings in the gate chamber (Figure 2.26b). From time to time, these cushions blow out into the air vent, leading to minor pressure fluctuations behind the gate. To eliminate this phenomenon, the ceilings simply need to be sloped.
Reducing generation loss - operating with ice and debris on the Upper Mississippi River
Published in Jean-Pierre Tournier, Tony Bennett, Johanne Bibeau, Sustainable and Safe Dams Around the World, 2019
The LSAF Hydroelectric Project, based at this facility is owned by SAF Hydropower, LLC (co-owned by Brookfield Renewable and Nelson Energy), includes a run-of-river 9- megawatt generating system, a control building, substation, a transmission line, and ancil- lary facilities. The turbine-generator assembly is located downstream of the auxiliary lock tainter gate and consists of sixteen matrix units in a stacked arrangement. The matrix units are equipped with integral trash screens. Flow from the turbine-generator assemblies pass through concrete encased draft tubes that have downstream gates to regulate water flow.
Discussion on paper “Flow through a sluice gate over a broad crested weir under free and submerged-flow conditions”
Published in ISH Journal of Hydraulic Engineering, 2023
K = (Cd) values in case of tainter gate (Figure 1c) are found to be higher than that in a vertical sluice gate due to reduction in head loss. Tainter gates are easy to operate since the trunion of the gate is above water surface and can be maintained easily as compared to vertical sluice gate. They are mostly used for flow regulation in ogee-type spillway for dams.