Dam face energy dissipation tool

Abstract

The invention discloses a dam face energy dissipation tool. A plurality of groups of bosses are distributed on a dam face from top to bottom in a staggered mode; the top surface of each boss tilts upwards from front to rear; the rear edge of each boss is arc-shaped; the air entraining length can be effectively increased, and the contact surface of water flow and air is enlarged, so that the air mixing on the surface of an aerial drainage tongue is full, an air-containing vortex on the bottom edge is stable and complete. In addition, the top surface of the boss tilts upwards to form a slightly concave area like a miniature plunge pool, the energy dissipation can be improved and the drop flow impact can be reduced due to a formed plunge layer, and the dam face is prevented from being subjected to cavitation; and during flood discharge, the water flow is dispersed and drops in a fan shape from the top surfaces of the bosses and forms the air-containing vortex along the arc-shaped rear edges of the bosses, the fan-shaped disperse water flow and the fan-shaped disperse water flow on the adjacent bosses are collided and mixed on the plunge layer on the top surfaces of the next bosses, are dispersed and drop in the fan shape and form a scale-type dam face space three-dimensional energy dissipation typical flow state in which the surface has an air mixing tongue, the bottom has the air-containing vortex and the local part has disperse collision and plunge energy dissipation. The dam face energy dissipation efficiency can be effectively improved.

Description

technical field [0001] The invention relates to an overflow dam structure, in particular to a dam surface energy dissipation device for an overflow dam. Background technique [0002] A dam is a water-retaining building that intercepts the water flow of a river channel to raise the water level or regulate the flow. It has the functions of forming a reservoir, raising the water level, regulating the runoff, and concentrating the water head, and is used for flood control, water supply, irrigation, hydroelectric power generation, and improvement of shipping. However, when the dam discharges floods, the water flow is highly concentrated, and effective energy dissipation methods must be adopted to dissipate the energy of the discharged water flow. Otherwise, the huge water energy generated by the flood discharge will have a negative impact on the downstream riverbed and the surrounding environment. [0003] Among the existing energy dissipation methods, it is quite effective to di...

AI Technical Summary

Problems solved by technology

However, these two step-shaped dam surface energy dissipators 10 still have shortcomings: 1. When the single-width flow rate is large, the thickness of the water tongue is larger than the height of the step 100, and the position where aeration and stable vortex occur is lower , the skid-sweep flow is not fully developed, resulting in low energy dissipation efficiency; 2. For medium and low dams with short flow on the dam surface, even a stable slip-sweep flow cannot be formed, and the advantages of stepped energy dissipation on the dam surface cannot be reflected; 3. Even under normal operating conditions, the energy dissipator has a certain room for optimization and improvement, further reducing the engineering volume of the downstream stilling basin

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