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alveolar aeration challenge

A cogging and notch technology, applied in the field of cogging-type aeration pick-up sills, can solve the problems of endangering the safe operation of drainage structures, the complex shape of differential aeration sills, and the influence of aeration facilities reliability, etc., to achieve Low cost, convenient construction, and smooth flow surface on the sill

Active Publication Date: 2016-08-31
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shape of the differential aeration sill is complex, the flow surface is concave and convex, and the flow state on the sill is complex. Under the action of high-speed water flow, the sill itself is easy to cause cavitation damage, which will have a certain impact on the reliability of the aeration facility, thereby endangering Safe operation of drainage structures

Method used

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  • alveolar aeration challenge
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Examples

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Effect test

Embodiment 1

[0038] Embodiment 1: as Figure 5 As shown, the present embodiment is an alveolar-type aerated ridge, and the ridge body 2 is arranged on the floor 1 of the drainage structure, and a notch is set at the end of the ridge body 2 along the water flow direction, thereby forming a tooth ridge 201 And groove ridge 202, wherein the tooth ridge height h1>groove ridge height h2>0. The alveolar-type aerated ridge makes the water jet out from different heights after leaving the ridge, the aerated bottom surface is a concave-convex curved surface, and the area of ​​the water-air contact surface of the cavity increases (see Figure 24 ), at the same time, the turbulence of the water flow is intensified, thereby entraining more air and increasing the aeration concentration at the bottom of the water flow. In this embodiment, the angle between the downstream surface 2021 of the ridge 202 and the bottom plate 1 of the drainage structure is an obtuse angle.

[0039] The effectiveness of this...

Embodiment 2

[0048] Embodiment 2: The structure of this embodiment is basically the same as that of Embodiment 1, except that the downstream surface 2021 of the ridge 202 used in this embodiment is perpendicular to the bottom plate 1 of the drainage structure (see Figure 15 - Figure 18 ).

Embodiment 3

[0049]Embodiment 3: The structure of this embodiment is basically the same as that of Embodiment 2, the only difference is that this embodiment adopts a type in which the widths of the teeth and grooves change along the direction of water flow. Such as Figure 19 As shown in -22, the width of the tooth ridge 201 decreases gradually along the water flow direction.

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Abstract

The invention relates to an alveolar-type air-entrained ridge. The purpose of the present invention is to propose a new alveolar-type air-entraining ridge, which can increase the contact area between the water tongue and the cavity, enhance the turbulent mixing effect at the lower edge of the water tongue, and increase the air volume of the ridge , to extend the protective length of the aeration sill, and it can also be used in combination with the aeration tank and the sudden drop. The technical solution of the present invention is: an alveolar-type aerated sill, which is provided with a sill body on the bottom plate of the drainage structure. For ridge and groove ridge, tooth ridge height h1>groove ridge height h2>0. The invention is suitable for aeration and corrosion reduction of drainage structures in water conservancy projects.

Description

technical field [0001] The invention relates to an alveolar-type air-entrained ridge. It is suitable for aeration and corrosion reduction of drainage structures in water conservancy projects. Background technique [0002] With the development of high dam construction in our country, the flow velocity of high-head discharge structures is increasing, and the problem of high-speed water flow is becoming increasingly prominent. Among them, cavitation and cavitation erosion caused by high-speed water flow are the most serious hazards to hydraulic structures, which may directly affect the normal operation of buildings and even cause building accidents. [0003] Numerous experiments and engineering practices have proved that aerated corrosion reduction is the most economical and effective method to prevent cavitation damage on concrete flow surfaces. Experimental studies have pointed out that cavitation erosion can be greatly reduced when the air-entrainment concentration in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06
Inventor 吴伟伟刘西军李英勇陈国良
Owner POWERCHINA HUADONG ENG COPORATION LTD
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