Inclined flip bucket for spillway or flood discharge hole outlet

Abstract

The invention discloses an inclined flip bucket for a spillway or a flood discharge hole outlet. The inclined flip bucket consists of a first side wall, a second side wall, and a bottom plate between the two side walls. The bottom plate is provided with a warped surface in a variable cross slope ratio; the first side wall is a straight-side wall; and the second side wall consists of a straight wall segment and a circular arc segment which is tangential to the straight wall segment. The relative positions of the first side wall and the second side wall are that: a starting end part of the first side wall is parallel to the end part of the straight-side wall of the second side wall, and the first side wall and the straight wall segment of the second side wall are arranged in parallel at intervals; and during use, the starting end of the first side wall and the straight wall segment end of the second side wall are inlets of the water flow, and the connecting line of the circular arc segment end part of the second side wall and the tail end part of the first side wall is an edge line of the water flow outlet. The drop point range of the trajectory nappe formed by the inclined flip bucket is positioned in the center of a river channel, and the energy dissipation rate can reach over 80 percent on the premise of matching the energy dissipation of an absorption basin at the downstream.

Description

technical field [0001] The invention belongs to flood discharge and energy dissipation facilities used in water conservancy and hydropower projects, in particular to a flow-deflecting oblique nose sill used for the outlet of a spillway or a flood discharge tunnel. Background technique [0002] In water conservancy and hydropower projects, flood discharge and energy dissipation are very critical technical issues. Statistical analysis of a large amount of actual engineering data shows that the cost of flood discharge and energy dissipation facilities accounts for about 40% to 50% of the total project cost. Therefore, the selection of appropriate flood discharge and energy dissipation facilities is of great significance for optimizing the layout of the hub and saving investment. [0003] The energy of the water flowing out from the spillway or the spillway tunnel is relatively large, so it is necessary to install energy dissipation facilities at the outlet of the spillway or th...

AI Technical Summary

Problems solved by technology

The energy dissipation facilities at the outlet of the spillway or the spillway tunnel generally choose the deflecting flow energy dissipation method. The existing deflecting flow nose sills are continuous sills, differential sills, narrow slit sills, high and low sills, diffuse sills, oblique cut sills, twisted sills, Tongue-shaped ridges and other raised ridges are the most widely used, but for projects where the spillway or spillway outlet channel diverges greatly, due to the constraints of topographic and geological conditions and downstream river channels, the existing raised ridges cannot meet the requirements of energy dissipation and scour prevention. Requirements, it is difficult to avoid the erosion and damage of the water flow to the left and right banks of the outlet channel

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