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Collision combined underflow energy dissipator structure

An energy dissipation and overflow technology for undercurrents, applied in water conservancy projects, marine engineering, coastline protection, etc. It can solve the problems of complex layout, impact damage, and great threat to dam sites, avoiding vertical axis vortex damage and reducing water flow pulsation. , the effect of improving energy dissipation efficiency

Active Publication Date: 2015-12-23
CHINA THREE GORGES CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although these auxiliary energy dissipators can achieve certain effects, the determination of the layout scheme is relatively complicated and is prone to cavitation or impact damage. In addition, the backflow caused by these measures poses a greater threat to the dam site

Method used

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  • Collision combined underflow energy dissipator structure
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  • Collision combined underflow energy dissipator structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1 and Embodiment 2 respectively represent two different forms of continuous type and interval type for the structure of the secondary discharge trough, and in each case, the end ridge is divided into two types: continuous type and differential type.

[0062] The continuous end ridge means that the end of the ridge of the secondary discharge groove is a continuous smooth overflow surface.

[0063] The differential end ridge refers to the overflow surface with the same height difference at the end of the ridge of the secondary discharge groove perpendicular to the direction of water flow. The embodiment is applicable to two forms of continuous outflow and multi-strand outflow of the upstream first-stage discharge groove. When the chute partition wall is not included, the upstream first-stage chute adopts a continuous discharge method, and the jet produced is a continuous jet; For multiple jets.

[0064] The collision-type combined underflow energy dissipator ...

Embodiment 2

[0075] Such as image 3 and Figure 4 Shown is a schematic plan view and a schematic elevation view of the second embodiment of the present invention.

[0076] The structure of the collision-type combined underflow energy dissipator in this embodiment includes a first-stage discharge trough 1, a chute partition wall 2, a secondary discharge trough 3, a stilling pool 4, a stilling pool tail sill 5 and a downstream guard. Tank 6.

[0077] Among them, the end of the primary discharge tank 1 is horizontal, and there is a certain elevation difference with the bottom plate of the stilling tank 4; The overflow surface is a continuous smooth surface, and the discharge water flow is continuously concentrated into the pool; the overflow surface of the secondary discharge groove 3 is smoothly connected with the end of the primary discharge groove 1, and the length L of the secondary discharge groove is taken as 2P~ 3P, P are the heights from the end of the primary discharge tank 1 to ...

Embodiment 3

[0081] Such as Figure 5 and Image 6 Shown is a schematic plan view and a schematic elevation view of the third embodiment of the present invention.

[0082] The new combined underflow energy dissipator structure in this embodiment consists of a first-stage discharge trough 1, a chute partition wall 2, a secondary discharge trough 3, a stilling tank 4, a stilling tank tail sill 5 and a downstream apron 6.

[0083] Among them, the end of the first-stage discharge groove 1 is horizontal, and there is a certain elevation difference with the bottom plate of the stilling pool 4; the second-stage discharge groove 3 is of an interval type, and the discharge water flow is divided into multiple jets scattered into the pool; the second-stage discharge groove 3 The curved surface of the overflow is smoothly connected to the end of the primary discharge tank 1, the length L is 2P to 3P, and P is the height from the end of the primary discharge tank 1 to the bottom plate of the stilling...

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Abstract

The invention relates to a collision type combined underflow energy dissipater structure. The collision type combined underflow energy dissipater structure comprises a primary flow discharge groove, a secondary flow discharge groove, a stilling pool, a stilling pool tail sill and a downstream apron, wherein a flow discharge groove partition wall is placed in the primary flow discharge groove, the secondary flow discharge groove is formed between the primary flow discharge groove and the stilling pool, the stilling pool tail sill and the downstream apron are sequentially connected to the stilling pool, the elevation difference exists between the tail portion of the primary flow discharge groove and the stilling pool, and a flip bucket is arranged at the tail end of the secondary flow discharge groove. Compared with an existing underflow energy dissipater structure, the collision type combined underflow energy dissipater structure has the advantages that the flow discharge curve is changed, part of downward relieved main current is upward lifted, collision occurs between the part of the downward relieved main current and the main current, turbulent fluctuations in the water flow state are enhanced, the water flow is prevented from directly impacting a bottom plate of the stilling pool, the energy dissipation efficiency is improved, meanwhile, pulsation of the water flow in the stilling pool is reduced, the safe running and the service life of a flow discharge building are ensured, and the collision type combined underflow energy dissipater structure can be widely applied to relieving of flow with different flow rates and of different forms.

Description

technical field [0001] The invention relates to the field of flood discharge and energy dissipation facilities, in particular to a novel collision-type combined underflow energy dissipation structure suitable for the collision and energy dissipation of secondary discharge troughs of large-scale water conservancy projects. Background technique [0002] Underflow energy dissipation is a form of energy dissipation that utilizes hydraulic jumps to transform flow states and eliminate braking capabilities. Underflow energy dissipation is not restricted by the foundation, and has the advantages of stable flow state and little influence of atomization. The hydraulic index of the water flow is very high, and the bottom of the stilling pool needs to be built with an apron, so it is a relatively expensive energy dissipation facility. [0003] Due to the limitations of the conventional energy dissipation methods in the application process, in order to improve the energy dissipation rate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06
Inventor 戴会超郑铁刚张培培杨文俊牛志攀
Owner CHINA THREE GORGES CORPORATION
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