Jet-flow control structure for overflow surface of high dam

Abstract

The invention discloses a jet-flow control structure for an overflow surface of a high dam. An overflow surface flip bucket is arranged at a chute section on a dam body; the lower section of the chute section is connected with a continuous type flip bucket; arc-shaped water retaining walls are arranged at the two sides of the overflow surface flip bucket for converging water flow; an arc-shaped aeration ridge is arranged on the side surface of the overflow surface flip bucket; an aeration slot communicates with the overflow surface of the dam body; the overflow surface flip bucket comprises a middle overflow surface flip bucket which is aligned to the middle of a sluice hole and edge overflow surface flip buckets which are correspondingly connected with upper side piers at the two sides of the chute section; discharged water flow is firstly crossed and collides to dissipate energy after being diffused from the two sides of the overflow surface flip bucket, so that water flow shot by the overflow surface flip bucket is converged by the arc-shaped water retaining walls and is crossed with and collides with water flow shot by the continuous type flip bucket to dissipate energy, and sufficient aeration of water flow is matched, and therefore, discharged water flow drops into a downstream river bed after a great deal of energy is dissipated, downstream water flow is good in shape, and the energy dissipating effect is obvious.

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation of hydraulic structures in water conservancy and hydropower projects, and in particular relates to an overflow dam partition deflecting flow dissipation energy dissipation structure. Background technique [0002] With the development of rivers and the general trend of utilizing hydraulic power, many large dams have been built in our country. As an important part, overflow dams are distributed on rivers all over the country. However, when the overflow dam brings a lot of convenience to people, there are also many problems. High spillway dams have serious problems of flood discharge and energy dissipation due to "narrow valleys, high water heads, and large discharge volumes". Traditional high dam spillways usually use deflecting flow and underflow energy dissipation, and newer energy dissipation unions use narrow slits for energy dissipation. . However, because some spillway d...

AI Technical Summary

Problems solved by technology

[0004] 1. The scouring of the downstream riverbed is relatively serious, and when the scouring pit is too deep, it may endanger the safety of hydraulic structures;

[0005] 2. Strong backflow in the downstream can cause serious erosion of the bank slope;

[0006] 3. There are many deposits in the downstream of the scour pit, which may deform the downstream river bed, and the mound will raise the tail water and affect the output of the power station;

[0007] 4. The deflected flow causes atomization, improper handling can affect the normal operation of the hub, especially the power station

Similarly, it also has a strong downstream backflow, which can cause serious erosion of the bank slope and adverse effects of atomization on the power station

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