Damping of increased turbulence beyond a deep and relatively short spillway basin

In the article are presented efficiency evaluation results of work of various damping devices in the downstream of reclamation constructions, hydraulic and hydrodynamic operating modes of low-pressure spillways, where the idea of extinguishing energy by flooding a jet is implemented by a device of relatively deep and short spillway basin. It has been established that the investigated structure ensures reliable operation of the culverts’ downstream. The extinguishing of the excess kinetic energy of the flow with such a damper within the water-still area in relation to the interface structures of reclamation systems operating at Froude numbers in a compressed section of 20 … 130, specific flow rates in the downstream of 0.15 … 5.2 m2 / s, occurs quite effective. The calculation programs created on base of the processing of experimental data allow, within the framework of a numerical experiment, to establish the optimal design schemes of the downstream devices, the dimensions and angles of the free entry of the jet into the stilling well, providing the greatest effect of energy damping, depending on various defining parameters of the flow. The construction of such a well when installing the simplest energy absorbers in the end part in comparison with a conventional jump well leads to a decrease in its length by 30 … 60%. An assessment of the hydrodynamic effect of the flow on the local elements of the downstream device is given data on the distribution of actual hydrodynamic loads at the attachment points of the vertical type well and the outlet section behind the structure are given, depending on the coupling mode. The data of a comparative analysis of the decrease in the hydrodynamic characteristics of the flow in the zone of operation of a deep stilling well and a conventional jump well are presented. The compact dimensions of the considered damper will make it possible to reduce the length of the attachment section by about 1.5 … 2 times, but also its thickness, which will lead to a decrease in the cost of arranging both the interface section while ensuring safe and reliable operation, and the whole entire environmental structure.

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