A method and structure of "Yanwei ridge + paste slope" aeration

A technology of swallowing ridges and slopes, which is applied in water conservancy projects, sea area projects, coastline protection, etc., and can solve problems such as poor aeration effect

Active Publication Date: 2017-11-21
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes an aeration method and structure of "Yanwei ridge + sticking slope", which mainly solves the problem of water accumulation in aeration cavity of small bottom slope and low Fr number discharge channel, and poor aeration effect

Method used

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  • A method and structure of "Yanwei ridge + paste slope" aeration
  • A method and structure of "Yanwei ridge + paste slope" aeration
  • A method and structure of "Yanwei ridge + paste slope" aeration

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Embodiment 1

[0021] like Figure 1-3 As shown, the aeration structure of this embodiment consists of a dovetail groove at the end of the upstream end ( figure 2 Middle Yanwei ridge section, slope i 1 ), and the slope at the downstream end that is larger than the slope of the bottom plate of the discharge channel ( figure 2 Middle paste slope section, slope i 3 ) and the connecting section connecting the ridge and the slope ( figure 2 middle link, slope i 2 )composition. The slope and the connecting section and the downstream original floor are connected by points (point connection on the section view and straight line connection on the plan view). The connecting section is a flat slope (i 2 =0).

Embodiment 2

[0023] like Figure 4 As shown, the aeration structure of this embodiment is similar to that of Embodiment 1, the difference is that the slope and the upstream connection section are connected by a convex arc curve, and the slope and the downstream bottom plate are connected by a concave arc curve (the arc curve is shown in the cross-sectional view Connection, surface connection in plan view). The connection form can also be a straight line in the section (a straight line connection in a section view, and a plane connection in a plan view) or other curved connections.

Embodiment 3

[0025] like Figure 5-7 As shown, the aeration structure of this embodiment is similar to that of Embodiment 1, the difference is that the slope of the bottom plate after the slope is pasted is smaller than the slope of the upstream bottom plate (i 4 ﹤i 0), the slope and the upstream connection section are connected by a convex arc curve, the slope and the downstream floor are connected by a concave arc curve, and the slope of the connection section is a positive slope (i 2 >0).

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Abstract

The invention proposes an aeration method and structure of "Yanwei ridge+pasted slope", which mainly solves the problem of water accumulation in the aeration cavity of the small bottom slope and low Fr number discharge channel, and poor aeration effect. The aerated structure is mainly composed of "swallow tail" ridge, downstream slope and connecting section. Open a V-shaped notch at the end of the conventional two-dimensional continuous straight-line ridge (it looks like a swallowtail, so it is called a swallowtail ridge), and adjust the projecting angle of the water tongue on the top of the ridge and the distribution of the water tongue landing point behind the ridge, which is conducive to unifying the jet impact angle; A steep slope is set at the drop point of the water tongue on the bottom slope, so that the impact angle of the jet is within the critical value of backtracking water flow, which can eliminate the return water generated at the drop point of the water tongue on the bottom slope; the upstream end of the slope and the upstream pick The ridges are connected by connecting sections, which are generally flat slopes or positive slopes. The Yanwei ridge, the slope and the connecting section form a complete system through different connection methods. The invention has the advantages of simple structure, resistance to cavitation and cavitation erosion, strong versatility, large air-entrained cavity, stability and no water accumulation.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and relates to an aeration-type setting method for a discharge channel, in particular to solve the problem of aeration in a discharge channel with a large single width, a small bottom slope, and a low Fr number. Background technique [0002] Tunnel flood discharge is widely used in water conservancy and hydropower projects. According to the layout form, it can be divided into dragon head type, dragon tail type and one slope to the bottom. When the height difference between the entrance and exit is large, the dragon head and dragon tail are often used; when the height difference is small, the longitudinal drop is limited and the slope of the cave body is relatively gentle. Regardless of the type of layout, since flood discharge tunnels generally have a single width and a large flow rate and high flow rate, cavitation and cavitation are prone to occur, so it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06
Inventor 吴时强王芳芳王威吴修锋周杰沙海飞薛万云戴江玉曹昊陈惠玲
Owner NANJING HYDRAULIC RES INST
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