Deformed inverse step rectifying energy dissipation method and stilling basin

A technology of reverse steps and stilling pools, which is applied in water conservancy projects, embankments, sea area engineering, etc., can solve the problems of difficult water flow energy dissipation, and the energy dissipation effect needs to be improved, so as to achieve energy dissipation flow velocity distribution, reduce downstream erosion, improve The effect of energy dissipation rate

Active Publication Date: 2015-07-15
NANJING HYDRAULIC RES INST +2
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of energy dissipation for low water head, large single width, and low Fr number flow has always been difficult, especially the single width flow is extremely large (greater than 300m 2 / s) and the Fr number is extremely low (1~2), it is very difficult to dissipate the energy of the water flow
For the reverse step (that is, the plane elevation of each step rises step by step along the direction of water flow) energy dissipation method, a single step type (such as ridge, pier, etc.) is mostly used in current projects, which can also be understood as a reverse step form for rectification Or promote the hydraulic jump, but the energy dissipation effect needs to be improved

Method used

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  • Deformed inverse step rectifying energy dissipation method and stilling basin
  • Deformed inverse step rectifying energy dissipation method and stilling basin
  • Deformed inverse step rectifying energy dissipation method and stilling basin

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 , figure 2 As shown, the special-shaped anti-step stilling pool is composed of a drop sill 1 at the front, a floor 2 at the bottom, side walls 3 on both sides and a tail sill 4 at the end. The sidewalls 3 on both sides are asymmetrically distributed and diffuse toward the river center in a curved surface. The curved surface diffusion can be in the form of plane, arc surface, elliptical arc surface and multiple curved surfaces, or any combination of various curved surfaces. Flow regime adjustments need to be decided. The tail sill 4 is set as a continuous reverse step tail sill, which is composed of steps whose width changes with the diffusion of the side wall of the stilling pool. The shape of the tail sill step is low at the entrance, high at the exit, low at the river center side, and high at the side near the bank slope, forming a horizontal and vertical three-dimensional special-shaped reverse step structure. The planar shape of the step unit in...

Embodiment 2

[0025] Taking the hydraulic model test of a certain project as an example, the single-width flow rate of the inlet water flow of the stilling pool is 399m 2 / s, Fr number is 1.48, the exit is close to the right bank slope D (the side of the stilling pool close to the right bank slope D is the near bank slope side, and the side close to the left bank slope E is the river center side), and the right bank slope D is The geology of the soil slope, the construction site on the bank, the geological condition of the exit bedrock is only about 80m, followed by the geological condition of deep overburden. If traditional methods such as tooth ridges, diversion piers, and twisted surfaces are used, it is difficult to smoothly return the mainstream to the center of the river, and the energy dissipation rate is extremely low. The downstream scour pit is more than 30m, and the protection cost is very high. The special-shaped anti-step stilling pool is used to form a complete and stable hydr...

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Abstract

The invention discloses a deformed inverse step rectifying energy dissipation method and a stilling basin. A continuous inverse step tail on a bottom plate is adopted instead of the conventional tail body type, and water current is collided with inverse steps hierarchically, so that energy is dissipated hierarchically, water current collision, doping and a fluctuation flow state before drainage are enhanced, and collision energy dissipation is realized; a vertical drop is arranged at a front-end inlet; side walls on both sides are asymmetrically diffused towards a river heart side curved surface, and the edges of each step are arranged in a continuous L or saw-tooth form, thereby forming transverse and longitudinal three-dimensional deformed inverse step structures being lower at the inlets, higher at the outlets, lower on the river heart sides and higher on the near-bank sides, so that a hydraulic jump energy dissipation flow state is formed forcibly in the basin. Meanwhile, water current is fully diffused transversely and is guided towards the river heart side, so that the basis length can be shortened effectively, the energy dissipation rate is increased, the effects of dissipating energy and adjusting the flow speed distribution are achieve, water current discharged out of the basin returns into a groove smoothly, and downstream erosion is relieved. The deformed inverse step rectifying energy dissipation method and the stilling basin are suitable for a water flow state with low water head, large unit width flux (particularly greater than m<2> / s) and low Fr number (particularly Fr number is smaller than 2).

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation of water conservancy and hydropower projects, and relates to an energy dissipation method and a stilling pool. Background technique [0002] In water conservancy and hydropower discharge structures, when the discharge is connected with the downstream natural river, it is necessary to dissipate energy and adjust the flow velocity distribution. High water head and high Fr number (Note: Fr number is called Froude number, which is a hydraulic parameter, hereinafter referred to as "Fr number") discharge conditions, can be used to add water cushion ponds with deflected flow, or can be added with bottom flow or surface flow. Stilling pool and other measures to achieve the purpose of energy dissipation and anti-scour. However, the problem of energy dissipation for low water head, large single width, and low Fr number flow has always been difficult, especially the single width flow is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B3/10
CPCE02B8/06
Inventor 吴时强王芳芳吴修锋周杰王威戴江玉薛万云吴越杰陈惠玲
Owner NANJING HYDRAULIC RES INST
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