Shaft rotational flow and energy dissipation tunnel spillway with diving spinning pier

Abstract

The invention provides a shaft rotational flow and energy dissipation tunnel spillway with a diving spinning pier. An outer circumference of a water inlet of the tunnel spillway is provided with an annular weir, a plurality of spinning piers are arranged outside the annular weir, the water inlet is connected with a shaft, the shaft is connected with an adit, the adit is connected with a water outlet, the tunnel spillway further comprises a plurality of shaft air supplementary pipes and a plurality of adit air supplementary pipes, the shaft air supplementary pipes are used to supplement air tothe wall of the shaft, an air inlet at the upper end of each shaft air supplementary pipe is higher than the highest water level of a reservoir, and each shaft air supplementary pipe is provided witha plurality of air outlets on the pipe wall of the shaft; the adit air supplementary pipes are used to supplement air to the wall of the adit, the air inlet at the upper end of each adit air supplement pipe is higher than the highest water level of the reservoir, and each adit air supplementary pipe is provided with a plurality of second air outlets on the pipe wall of the audit. The shaft rotational flow and energy dissipation tunnel spillway can use negative pressure generated by the water flow separation phenomenon of the tunnel spillway to introduce outside air so as to reduce the negativepressure and increase the pressure on the wall of the tunnel spillway, and the cavitation damage of the tunnel spillway is prevented.

Description

Technical field [0001] The invention belongs to the technical field of hydraulic structures, and particularly relates to a diving pier shaft swirling flow energy dissipation flood discharge tunnel. Background technique [0002] In the construction of water conservancy and hydropower projects, when the retaining structure of the reservoir is an earth-rock dam, when the topography on both sides of the dam site is steep, the flood discharge tunnel is often used. The principle of swirling energy dissipation is to use the flood discharge flow to rotate in the shaft (or flat cave) channel, which greatly enhances the friction effect between the water flow and the side wall of the channel, and increases the flow, so that the water flows through different flow directions along the way. Blending to achieve the reduction of water flow energy, the prior art shaft swirling energy dissipation flood discharge tunnel uses the swirling structure of the shaft wellhead to convert the horizontal wat...

AI Technical Summary

Problems solved by technology

However, in the current vertical shaft swirling flow energy dissipation flood tunnel engineering structure, with the upgrading of the scale of the project, the wall of the flood discharge tunnel (such as the wall of the vertical shaft and the wall of the flat tunnel) often has the phenomenon of water flow separation and generates a large negative pressure. Only through the existing technology It is still difficult to better achieve the purpose of water flow energy dissipation in the vertical shaft swirl energy dissipation method. It is necessary to further find ways to increase the pressure on the wall surface, and at the same time further reduce the water flow energy in the vertical shaft, so as to prevent cavitation damage in larger spillway tunnels. situation arises

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