Stilling Basin With a Flow Swirling

Abstract

In the given materials there is given an analysis of the operation of existing constructions of devices for dissipation of excess energy of idle water discharges at hydraulic engineering facilities. The most applied design for dissipation of fl ow energy in the practice of hydraulic building in the world is stilling basins with straight axis made in prismatic or trapezoidal shapes which is appealing in their simplicity. The main disadvantage of these stilling wells in case of their using together with tubular spillways, especially having several strings, is practical impossibility to provide uniform distribution of specific discharges at the outlet from the spillway. This is connected with the fact that with several strings it is difficult to provide uniform distribution of specific discharges in the inlet section of the stilling well, it causes appearance of unstable regimes during operation of the stilling basin, especially in case of spillway operation with incomplete front which makes them inapplicable exactly for multi-point tubular spillways. At the same time, by deforming the stilling basin well flow in the form of a spiral, it is possible to reduce the length of the spilling basin by creating the possibility of the planned symmetric spreading of the flow in the output section in the diversion channel of the stilling basin, allowing using it if necessary to repeatedly expand the flow behind the spillway.