Adverse slope type step energy dissipater

Abstract

The invention discloses an adverse slope type step energy dissipater, which comprises a straight section close to a water inlet, and an adverse slope type step section connected with the straight section, wherein the adverse slope type step section consists of multi-stage adverse slope type steps; the adverse slope type steps are steps of which the upper surfaces are adverse slope surfaces; the slope of the bottom slope of the adverse slope type step section is the same as that of the bottom slope of the straight section; the horizontal projection length and height of various stages of the adverse slope type steps which form the adverse slope type step section are the same; the horizontal projection length L1 is equal to 0.4 to 18m, and the horizontal projection height h1 is equal to 0.5 to 3m. A front aerator can be arranged on the straight section, so that the cavitation erosion resistance is improved.

Description

technical field [0001] The invention belongs to internal flow flood discharge and energy dissipation facilities, in particular to a stepped energy dissipation facility for spillway (hole) or dam surface overflow. Background technique [0002] The energy dissipation method of the ladder belongs to the internal flow energy dissipation. Because of its special structure, the water flow structure changes, and the influence of the boundary roughness increases the turbulence of the water flow itself, which is easy to form a tumbling, which drives the generation of energy dissipation vortex, and it is very easy to realize the potential energy. The conversion to turbulent kinetic energy and heat energy has good energy dissipation effect; and it has strong practicability, low economic cost, convenient construction, and easy maintenance. Therefore, the development prospect is very broad. The traditional uniform and continuous "one"-shaped ladder (traditional ladder for short) has been ...

AI Technical Summary

Problems solved by technology

The traditional uniform and continuous "one" shaped ladder (traditional ladder for short) has been widely praised in practical engineering applications, but with the development of water conservancy projects in my country, the adaptability of traditional ladders has become worse, and its disadvantages have gradually emerged

Analyzing the reasons, in the past 10 years, my country's large-scale water conservancy projects have shown the characteristics of high dams and large reservoirs. Correspondingly, the requirements and difficulties in the link of flood discharge and energy dissipation have become more and more difficult. According to statistics, traditional ladders are used to discharge single-width flow at 50m 3 When the water flow is above / s-m, there are the following disadvantages: 1. The energy dissipation rate decreases obviously, and the advantage of eliminating most of the potential energy along the way is obviously weakened; 2. The discharge flow increases, and the flow velocity increases rapidly when the water flow on the step surface passes by. It is known that the pressure drops sharply, and this trend increases the possibility of cavitation damage

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