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Vent and bank pressing energy dissipater

A technology of energy dissipators and pressure sills, applied to energy dissipators. It can solve the problems that the cavitation characteristics of the hole plug or orifice plate are difficult to meet the requirements, the safety of the cave body is difficult to ensure, and there is no energy dissipation, etc., and achieve the effect of good aeration and corrosion reduction, stable flow state, and improved cavitation characteristics.

Inactive Publication Date: 2008-06-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aiming at the energy dissipation problem of large flow and high head flood discharge tunnels, especially the energy dissipation problem of converting the diversion tunnel into a permanent flood discharge tunnel during the construction period, the current types of dragon head and vertical shaft swirl are generally used. The former has almost no energy dissipation, mainly The water head loss along the way has a certain amount of energy dissipation, and the remaining water head after exiting the cave is still very large, and due to the high flow velocity in the cave, it is necessary to install aeration and corrosion reduction facilities. Even so, cavitation damage may still occur when the water head is high; The latter shaft is mainly to rotate the water flow into the bottom of the shaft to avoid the water flow directly hitting the bottom of the shaft. The strong turbulence of the water flow in the stilling shaft plays a major role in energy dissipation. Since the swirling flow will inevitably draw a large amount of air into the water body, the lower flat section should be The open flow is used to facilitate the release of gas, but most of the diversion tunnels in actual projects are arranged at a low elevation, and the outlet of the diversion tunnel is lower than the river water level during the flood. state, the safety of the cave body is difficult to guarantee
[0003] Orifice plate energy dissipators and hole plug energy dissipators are energy dissipation facilities that can be installed in the flood discharge tunnel, but they all require high water pressure to increase the cavitation number of the water flow, which is realized by increasing hole plugs or orifice plates step by step. Energy dissipation, practice has shown that the cavitation characteristics of the last level of hole plug or orifice plate are difficult to meet the requirements

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  • Vent and bank pressing energy dissipater
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  • Vent and bank pressing energy dissipater

Examples

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Embodiment 1

[0023] The ventilating sill energy dissipator in this embodiment has a structure such as figure 1 , figure 2 , image 3 , Figure 4 As shown, it includes suspension plate 2 connected to the top wall and side walls of the spillway tunnel, and concrete pressure sill 6 connected to the top wall and side walls of the spillway tunnel. The pressure sill 6 is located behind the suspension plate 2 and forms a circle with the suspension plate. Ventilation corridor 3, the ventilation corridor 3 communicates with the ventilation shaft 4 set in the flood discharge tunnel, and there are multiple support rods 5 connected between the pressure sill 6 and the suspension plate 2, and the distance between the pressure sill and the bottom surface of the suspension plate and the bottom of the flood discharge tunnel forms water flow channel.

[0024] Combine the ventilating sill energy dissipator with the above structure and the L-shaped energy dissipator, and use the "L-shaped energy dissipato...

Embodiment 2

[0028] The ventilating sill energy dissipator in this embodiment has a structure such as figure 1 , figure 2 , image 3 , Figure 4 As shown, it includes suspension plate 2 connected to the top wall and side walls of the spillway tunnel, and concrete pressure sill 6 connected to the top wall and side walls of the spillway tunnel. The pressure sill 6 is located behind the suspension plate 2 and forms a circle with the suspension plate. Ventilation corridor 3, the ventilation corridor 3 communicates with the ventilation shaft 4 set in the flood discharge tunnel, and there are multiple support rods 5 connected between the pressure sill 6 and the suspension plate 2, and the distance between the pressure sill and the bottom surface of the suspension plate and the bottom of the flood discharge tunnel forms water flow channel.

[0029] The ventilated pressure sill energy dissipator with the above structure is used in combination with the L-shaped energy dissipator and the hole pl...

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Abstract

The present invention relates to an air-breathing pressure ridge energy dissipater. It includes the following several portions: suspension plate connected with top wall and two side walls of flood-discharge tunnel; pressure ridge connected with top wall and two side walls of flood-discharge tunnel; the pressure ridge is positioned after the suspension plate, said pressure ridge and the suspension plate can be formed into an air-breathing gallery, said air-breathing gallery is communicated with the air-breathing well set in the flood-discharge tunnel; between the pressure ridge and suspension plate a supporting bar is connected; the space distance between the pressure ridge, undersurface of said suspension plate and flood-discharge tunnel bottom portion is formed into a water flow channel. Said invention also provides the concrete working principle and method for energy dissipation of the invented air-breathing pressure ridge energy dissipater.

Description

technical field [0001] The invention belongs to energy dissipation facilities used in water conservancy and hydropower projects, in particular to an energy dissipation facility for pressurized flood discharge tunnels. Background technique [0002] Aiming at the energy dissipation problem of large flow and high head flood discharge tunnels, especially the energy dissipation problem of converting the diversion tunnel into a permanent flood discharge tunnel during the construction period, the current types of dragon head and vertical shaft swirl are generally used. The former has almost no energy dissipation, mainly The water head loss along the way has a certain amount of energy dissipation, and the remaining water head after exiting the cave is still very large, and due to the high flow velocity in the cave, it is necessary to install aeration and corrosion reduction facilities. Even so, cavitation damage may still occur when the water head is high; The latter shaft is mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06E02B9/06
CPCY02E10/22Y02E10/20
Inventor 刘善均许唯临王韦曲景学张建民邓军
Owner SICHUAN UNIV