A bottom sudden expansion type swirl shaft flood discharge tunnel

Abstract

The invention discloses a flood discharge tunnel of a swirl vertical shaft with sudden expansion at the bottom, which comprises a sluice chamber, an upper flat section, a vortex chamber, a contraction section, a vertical shaft straight section, a pressure slope section and a flood discharge tunnel body. There is a sudden expansion straight section, the axes of the sudden expansion straight section and the shaft straight section are on the same straight line and the diameter of the sudden expansion straight section is larger than the diameter of the vertical shaft straight section, the sudden expansion straight section is connected with the vertical shaft straight section through a connecting section, and the connecting section and the vertical shaft straight section Smooth transition connection, the outlet of the straight section of the shaft is connected to the inlet of the connecting section, the outlet of the connecting section is connected to the inlet of the sudden expansion straight section, the bottom of the sudden expansion straight section is closed, the side wall of the sudden expansion straight section is provided with an outlet, and the entrance of the pressure slope section is connected to the entrance of the sudden expansion straight section. The outlet of the sudden expansion straight section is correspondingly connected so as to connect the pressure slope section with the sudden expansion straight section. The invention enhances the flood discharge capacity of the swirl shaft, improves the energy dissipation efficiency and energy dissipation effect, and reduces the flood discharge load of the swirl shaft flood discharge tunnel.

Description

technical field [0001] The invention belongs to the technical field of flood discharge and energy dissipation of water conservancy and hydropower projects, and in particular relates to a flood discharge tunnel of a swirl shaft with sudden expansion at the bottom. Background technique [0002] With the continuous development of water conservancy construction in my country, many large-scale water conservancy projects with high dams are under construction or are being planned. Flood discharge and energy dissipation are often the key to success or failure, and corresponding energy dissipation methods are constantly emerging. Different types and types. As a relatively new form of energy dissipation, swirling shaft energy dissipation is more and more favored by water conservancy workers due to its own outstanding advantages. [0003] The front view and top view of the existing swirl shaft spillway are as follows: figure 1 and figure 2 As shown, the swirl shaft spillway consists...

AI Technical Summary

Problems solved by technology

[0004] However, at the end of the vortex chamber, a constriction section with a narrow radial beam of a certain size is set to reduce the diameter of the swirl shaft to a size that meets the flood discharge requirements. Although it saves engineering costs and enhances the ability of water flow to adhere to the wall, it also leads to The energy-dissipating water body in the straight section of the lower shaft of the flow shaft is greatly reduced, thereby reducing the energy dissipation efficiency of the swirl shaft

At the same time, only a single pressure slope outlet is set in the straight section of the lower vertical shaft of the existing swirl shaft, which greatly limits the discharge capacity of the swirl shaft flood discharge tunnel

And this makes the only flood discharge tunnel at the outlet of the existing swirl shaft flood discharge tunnel bear all the flood discharge tasks of the entire shaft flood discharge system, which directly leads to a heavier flood discharge load on the downstream flood discharge tunnel

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