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Combined air entraining facility suitable for stepped overflow high dam

A combined and stepped technology, applied in water conservancy projects, sea area projects, coastline protection, etc., can solve problems such as dam stability and safety hazards, and achieve the effects of reducing direct impact force, increasing contact area, and increasing aeration concentration

Inactive Publication Date: 2018-10-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, a large negative pressure is also found on the step surface at the end of the stepped overflow dam. This "double peak" phenomenon on the dam surface brings great harm to the stability and safety of the dam body

Method used

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  • Combined air entraining facility suitable for stepped overflow high dam
  • Combined air entraining facility suitable for stepped overflow high dam
  • Combined air entraining facility suitable for stepped overflow high dam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: This embodiment is based on the Yunnan Lancang River Ahaihai Hydropower Station, which is located in the middle reaches of the Jinsha River at the junction of Yulong County (right bank) and Ninglang County (left bank) in Lijiang, Yunnan Province. It is planned for the middle reaches of the Jinsha River In the fourth step, the upstream is connected to the Liyuan Hydropower Station, and the downstream is the Jin'anqiao Hydropower Station. The project is a water conservancy and hydropower hub project that focuses on power generation, taking into account flood control, irrigation and other comprehensive utilization. In the test, the model of Ahaihai Hydropower Station was scaled to a scale of 1:60 and made of plexiglass. In the following example, one of the five holes in the Ahai overflow dam is used to illustrate the flow conditions.

[0023] The height h of the transition step 1 of the combined aeration facility in this embodiment 1 =33.34cm, width b 1 =2...

Embodiment 2

[0026] Embodiment 2: The height h of the transition step 1 of the combined aeration facility in this embodiment 1 =50.01cm, width b 1 =37.5cm. The transition step 1 is followed by 20 uniform steps 2, the height of which is h=16.67cm, and the width b=12.5cm. The uniform step 2 is followed by 6 arc-shaped aerated steps, where the height h of the vertical section 3 2=5.55cm, the vertical distance h between the vertical arc groove 6 and the vertical surface of the arc-shaped aeration step 3 =2.32cm, the vertical distance h between the horizontal arc-shaped groove 7 and the horizontal plane of the arc-shaped aeration step 4 =2.36cm, the length b of the first horizontal section 4 2 =2.08cm, the length b of the second horizontal section 5 3 =2.08cm.

[0027] Two measuring points are arranged on the vertical surface and the horizontal plane of the transitional step 1 for the test negative pressure; 10 measuring points are respectively arranged on the vertical surface and the hor...

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Abstract

The invention discloses a combined air entraining facility suitable for a stepped overflow high dam and relates to the technical fields of water conservancy projects and hydropower projects. Accordingto the combined air entraining facility suitable for the stepped overflow high dam, firstly, a first-stage step of the stepped overflow dam is designed to be a large step, so that a water current behind a pier generates a large air entraining cavity under action of the large step, the contact area between the water current and air is enlarged, and as the large cavity can entrain a large amount ofair in case of the high-speed water current, the air entraining concentration of the surface of the stepped overflow dam is increased; and secondly, an arc air entraining groove is additionally arranged in the horizontal face of a tail step of the surface of the stepped overflow dam, the water current flowing state in a traditional step is changed in a forced air entraining mode, the air entraining concentration of the water current at the tail end of the step is increased, and negative pressure is reduced. By means of the combined air entraining mode, the overall air entraining and cavitation alleviation capacities of the surface of the stepped overflow dam can be improved, and the service life of a dam body is prolonged. The stepped overflow dam has high ornamental value when applied tolandscape design.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a combined aeration facility suitable for a stepped overflow high dam. Background technique [0002] my country's first wide-end pier + stepped overflow dam + stilling basin joint energy dissipation device has better solved the energy dissipation problem of flood discharge structures with high water head and large single wide flow rate, and has been widely used in some large-scale water conservancy projects. Especially in the case of different flow rates, the flow pattern of the stepped overflow dam surface is quite different. When the flow rate of the water flow is small, the water flow falls along the step surface step by step, passing through the water body and the water body, and the water body and the dam surface. On the one hand, the energy dissipation effect of the water flow is increased, and on the other hand, the surround...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B8/06
CPCE02B8/06
Inventor 杨具瑞郭莹莹叶小胜汤建青张勤
Owner KUNMING UNIV OF SCI & TECH
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