An anti-arc stepped overflow dam with adjustable air entrainment and energy dissipation

Abstract

The invention relates to the technical field of water conservancy facilities and provides a reverse-arc step type overflow dam capable of adjusting aeration energy dissipation. The upstream face of the reverse-arc step type overflow dam is a vertical plane. The flow surface of the reverse-arc step type overflow dam comprises n sequentially connected step faces, wherein the first step face comprises a first WES overflow section and a reverse-arc camber connected with the first WES overflow section. The first WES overflow section comprises a first arc-shaped camber, a second arc-shaped camber, athird arc-shaped camber and a power camber which are connected sequentially. The step faces except for the first step face comprise second WES overflow sections and reverse-arc cambers connected withthe second WES overflow sections. Each second WES overflow section comprises a second arc-shaped camber, a third arc-shaped camber and a power camber which are connected sequentially. The power camber of each step face is connected with the corresponding arc-shaped camber. According to the reverse-arc step type overflow dam, cavitation damage risk of the step type overflow dam can be reduced, energy dissipation efficiency is improved, and the aeration amount in water is increased.

Description

technical field [0001] The invention relates to the technical field of water conservancy facilities, in particular to an anti-arc stepped overflow dam with adjustable aeration and energy dissipation. Background technique [0002] With the rapid development of hydropower projects in my country, flood discharge from high dams under large single-width flow has become an important research direction. The ladder energy dissipation tool has the characteristics of simple structure, quick construction, low cost, high energy dissipation rate and sufficient aeration within a certain single width flow range, and can be widely used in hydropower projects with small and medium single width flow. [0003] However, the traditional right-angle stepped overflow dam structure will weaken the disturbance of water flow under large single-width flow, resulting in reduced energy dissipation and aeration effects, and it is easy to produce a large-scale aeration dead zone on the stepped surface, in...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves technical problems such as the cavitation risk of existing stepped overflow dams and the limited amount of aeration in water. The arc stepped overflow dam, the anti-arc stepped overflow dam with n WES overflow surfaces and n anti-arc surfaces, has the functions of flood discharge, energy dissipation and aeration and reoxygenation, which can reduce the risk of cavitation damage of the stepped structure, Improve the energy dissipation rate and increase the amount of air in the water

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