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Self aeration method for sidewall of construction for releasing water in high velocity of flow

A technology for releasing water structures and high flow rate, which is used in construction, water conservancy projects, artificial waterways, etc.

Inactive Publication Date: 2006-04-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The observation found that at the impact point of the water flow on the side wall, due to the entrainment of air by the vertical shaft rolling, a small amount of air-entrained strips were produced, and the air-entrainment concentration was about 1.3%, but this concentration of air-entrainment was not enough to prevent cavitation damage. requirements

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  • Self aeration method for sidewall of construction for releasing water in high velocity of flow
  • Self aeration method for sidewall of construction for releasing water in high velocity of flow
  • Self aeration method for sidewall of construction for releasing water in high velocity of flow

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Embodiment Construction

[0020] The side canopy can be divided into two types: continuous type and differential type. Although both can achieve the purpose of aeration to reduce corrosion and protect the side wall, the water flow pattern and aeration concentration distribution caused by the two have different characteristics.

[0021] Such as figure 1 with figure 2 Shown continuous side canopy, only one side cantilever 4 is set on the side wall 1, the length L is longer, there is a row of aeration holes 2 under the side cantilever 4, communicated with the ventilation pipe 3 behind the side wall 1. Under the working condition of continuous sill, the water flows through the side sill, shoots to the inside, separates from the wall, and falls back to the wall after a certain distance. In this area, a closed cavity near the wall with a certain length can be formed; the external air enters the cavity through the air-mixing hole set behind the ridge, and is mixed on the air-water contact surface to form a ...

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Abstract

The high flow rate outlet structure side-wall self-aerating method belongs to the field of technology for preventing cavitation damage of high flow rate outlet structure side-wall. It is characterized by that on the high flow rate outlet structure side-wall a slope-shaped side deflector bucket is set along the water flow direction, on the side-wall a row of aerating holes is cut under the side deflector bucket, and in the back portion of said side-wall an air pipe communicated with aerating hole is set. Said side deflector bucket is divided into two kinds of continuous type and differential type.

Description

Technical field: [0001] The self-aeration method for the side wall of a high-flow rate drainage structure belongs to the technical field of protection of the side wall of the drainage structure, and particularly relates to the technical field of preventing cavitation damage to the side wall of the high-flow rate drainage structure. Background technique: [0002] With the improvement of dam engineering technology and the rapid development of my country's water conservancy and hydropower construction, the number of high-head and large-flow drainage structures is increasing, and a group of ultra-high dams with a dam height of 200-300m and giant hydropower projects with ultra-high-speed water flow (Such as Xiaowan, Xiluodu, Jinping Level 1, etc.) will be completed one after another. The maximum flow velocity in high head discharge structures such as spillway tunnels, deep holes and spillways of these projects can reach 50m / s. The resulting high-speed water flow problem is becomi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B5/02
Inventor 聂孟喜
Owner TSINGHUA UNIV