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High and low ridge underflow stilling basin

A stilling pool and bottom flow technology, applied in water conservancy projects, sea area projects, coastline protection, etc., can solve problems such as water surface fluctuations

Inactive Publication Date: 2008-07-09
POWERCHINA ZHONGNAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of large fluctuations in the water surface in the stilling pool of the falling sill and at the end of the sill, we have studied the shape of the high and low sills

Method used

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  • High and low ridge underflow stilling basin
  • High and low ridge underflow stilling basin
  • High and low ridge underflow stilling basin

Examples

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Embodiment Construction

[0028] A large-scale hydropower station project with an installed capacity of 6400MW uses a concrete gravity dam with a maximum dam height of 162m. The design flood (P=0.2%) enters the flood peak discharge of 41200m 3 / s, check flood (P=0.02%) inbound flood peak flow 49800m 3 / s. Among them, the water level difference between the upstream and downstream is about 85m in the case of flood verification, the maximum total discharge power is about 40,000MW, and the maximum single-width flow in the stilling pool is 225m 3 / s, the flow velocity of the stilling pool into the pool reaches 38m / s~42m / s.

[0029] Due to the limitation of environmental conditions, high and low bottom flow stilling pools are used for energy dissipation. The length of the stilling pool is 228m, and there is a central guide wall in the pool, which is divided into two symmetrical energy dissipation areas. The floor elevation of the consumption pool is 245m, and the elevation of the end sill is 270m.

[00...

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Abstract

The invention relates to high head, large unit width flood energy dissipation by hydraulic jump technique, in particular to a high-low bucket energy dissipation pool of hydraulic jump, wherein the invention adopts a proper contraction angle in the plane of the high bucket, and outside wall of the high bucket does not contract, after the flood of high bucket contracts, the distribution in the vertical section of flooding is changed, when the downstream water level is high, part of the flood entering the pool is properly raised to reduce flooding degree and to fully exert the characteristics of submerged jets, thereby lengthening the distance between the flood to the pool bottom plate, weakening surface periodic wave, improving effects, reducing tail bucket water surface fluctuating, and avoiding vertical-axis eddy at the backward-facing step boundary wall.

Description

technical field [0001] The invention relates to an underflow energy dissipation technology for high water head and large unit width flow, in particular to an underflow stilling pool with high and low sills. Background technique [0002] The problem of flood discharge energy dissipation with limited width of flood discharge front and large single-width discharge has always been a major problem in hydraulic engineering. Under the existing technical conditions, the bottom flow energy dissipation technology with high water head and large single wide flow rate adopts stilling basins with falling sills. The falling sills are divided into two types: continuous sills and high and low sills. See Figure 1 for the schematic diagrams of continuous ridge stilling pools and high and low ridge stilling pools. Among them, the meanings of the numbers in the figure are: 1—the bottom plate of the chute; 2—the high drop sill; 3—the low drop sill; 4—the stilling pool; Lichi tail ridge; 7—sea d...

Claims

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Application Information

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IPC IPC(8): E02B8/06
Inventor 程浩张金婉龚德瑜冯树荣张永涛潘江洋曾雄辉张苾萃
Owner POWERCHINA ZHONGNAN ENG
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