Combined energy dissipater suitable for high-head and low-flow flood discharge and energy dissipation

A small flow, high water head technology, applied in water conservancy projects, sea area projects, coastline protection, etc., can solve the problems of good energy dissipation effect, large flood discharge drop, and inconspicuous effect, so as to facilitate construction, improve energy dissipation rate, and benefit Effects of impact and friction

Active Publication Date: 2017-09-22
KUNMING UNIV OF SCI & TECH
15 Cites 1 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, many rivers have small flow rates and large flood discharge drop, and the downstream scouring damage of rivers intercepted by water conservancy projects is still relatively serious
Using energy dissipators for energy dissipation and anti-scouring, due to high water head and small flow, large energy dissipators have go...
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Method used

By the hydraulic model test results, it is optimized on the body shape, and simultaneously in order to ensure the safety and reliability of the dam body, the scope of application of the combined energy dissipator of the present invention is controlled under high head and low flow conditions. The combined energy dissipator of the present invention (see Figure 1) is composed of a diffused wi...
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Abstract

The invention discloses a combined energy dissipater suitable for high-head and low-flow flood discharge and energy dissipation, and belongs to the field of flood discharge and energy dissipation for water conservancy projects. The combined energy dissipater comprises flaring gate piers, a left abutment pier, a central pier, a right abutment pier, a stepped energy dissipation transition section, a stepped energy dissipation homogenization section, an aerator and an inverted-V-shaped step, wherein the left abutment pier, the central pier and the right abutment pier are located on a WES curved surface of a dam body; the flaring gate piers are arranged below the left abutment pier, the central pier and the right abutment pier separately; the flaring gate piers are diffusing-type flaring gate piers; the aerator is arranged below the flaring gate piers, and the other end of the aerator is connected with the inverted-V-shaped step; and the upper part of the inverted-V-shaped step is the stepped energy dissipation transition section, the lower part of the inverted-V-shaped step is the stepped energy dissipation homogenization section, and the stepped energy dissipation transition section is in an inverted-V shape. According to the combined energy dissipater disclosed by the invention, the diffusing-type flaring gate piers are beneficial to the diffusion and collision of water flow, and the friction of the water flow in air in the high-head and low-flow flood discharge and energy dissipation; and the inverted-V-shaped stepped energy dissipater optimizes the flow state of the water flow, lowers the height of 'water wing', is convenient to construct and saves cost.

Application Domain

Barrages/weirs

Technology Topic

EngineeringAbutment +1

Image

  • Combined energy dissipater suitable for high-head and low-flow flood discharge and energy dissipation
  • Combined energy dissipater suitable for high-head and low-flow flood discharge and energy dissipation
  • Combined energy dissipater suitable for high-head and low-flow flood discharge and energy dissipation

Examples

  • Experimental program(2)

Example Embodiment

[0017] Example 1: Such as Figure 1-6 As shown, a combined energy dissipater suitable for high-head and small-flow flood discharge and energy dissipation includes wide tail pier 1, left pier 2, middle pier 3, right pier 4, stepped energy dissipation transition section 5, and stepped energy dissipation uniform section 6 , Aeration ridge 8, inverted "V"-shaped ladder, the left pier 2, the middle pier 3 and the right pier 4 are located on the WES surface of the dam body, the left pier 2, the middle pier 3 and the right pier 4 are all equipped with wide tail piers 1. The said wide tail pier 1 is a divergent wide tail pier. Aeration ridge 8 is provided under the wide tail pier 1. The other end of the aeration ridge 8 is connected with the inverted "V"-shaped ladder, and the inverted "V"-shaped ladder is The part is the stepped energy dissipation transition section 5, the lower part is the stepped energy dissipation uniform section 6, and the stepped energy dissipation transition section 5 is in the shape of an inverted "V";
[0018] The diffuser section of the wide tail pier 1 is hexagonal, b 1 Is the top width of the diffuser section, b 2 Is the width of the bottom of the diffusion section, and B is the width of the center of the diffusion section. The diffusion ratio b1/B or b2/B of the middle pier 3 wide tail pier is less than or equal to 1/3. If the diffusion ratio is too large, it will affect its stability; The side piers of the body are close to the bank slope, and the side piers of the concrete dam are relatively firm. Therefore, the diffusion ratio b1/B or b2/B of the wide tail piers of the left pier 2 and the right pier 4 can be appropriately greater than the diffusion ratio of the middle pier 3 wide tail pier. But the spread ratio b of the wide-tailed pier on the left pier 2 and the right pier 4 1 /B or b 2 /B is less than or equal to 1/2, the width of the top of the diffuser section b 1 And the bottom width of the diffusion section b 2 It can be changed according to specific engineering requirements. When the wide tail pier is required to have high stability, the top width of the diffusion section can be used b 1 Wider than the bottom width of the diffuser section b 2 (Ie b 1 b 2 ); When the stepped energy dissipation stability is required to be higher, the bottom width of the diffusion section can be used b 2 Wider than the top width of the diffuser section b 1 (Ie b 2 b 1 ).
[0019] Further, the inverted V-shaped angle of the stepped energy dissipation transition section 5 is α=130°-150° and α is gradually reduced from top to bottom; the stepped energy dissipation uniform section 6 has a gradient and a constant width. Because the transitional ladder energy dissipation method is mainly affected by the first few steps, considering the energy dissipation rate and construction economy, a transitional inverted "V"-shaped ladder energy dissipation device with a variable angle form is adopted, and the angle α=130°~150°; The uniform steps have a slope and a constant width.
[0020] Through the National Natural Science Foundation of China (51569010) hydraulic model test, it can be known that the application of transitional ladder energy dissipation rate in ladder energy dissipation has increased, and the impact of the first few steps on it is obvious. The diffusion type wide tail pier of the present invention is hexagonal. The transitional inverted "V"-shaped ladder energy dissipater of the present invention includes two parts: a stepped energy dissipation transition section 5 and a stepped energy dissipation uniform section 6. The energy transition section 5 is in the shape of an inverted "V" with an angle α=130°~150° and α gradually decreases from top to bottom; the stepped energy dissipation uniform section 6 has a slope, a constant width, and uniform changes.
[0021] The combined energy dissipater of the present invention is composed of a diffuser wide tail pier and a transitional inverted "V"-shaped ladder energy dissipater. It is used in high-head and small-flow flood discharge energy dissipators. The divergent wide tail pier can strengthen water flow. Horizontal diffusion is conducive to water impact and friction, and improves energy dissipation rate; transitional inverted "V"-shaped ladder energy dissipater optimizes water flow pattern, reduces "water fin" height, is convenient for construction, and saves costs; diffuse wide tail pier and transition The inverted "V"-shaped ladder energy dissipater combined with energy dissipation is economical and safe, and can fully meet the flood discharge and energy dissipation requirements of high head and small flow, and it is worthy of promotion in high head and small flow basins in southwest China.
[0022] for example:

Example

[0023] Example 1: Ahai Power Station adopts the traditional Y-shaped wide tail pier + stepped overflow dam + stilling pool integrated energy dissipation method to dissipate energy and prevent scour. In actual operation, it is found that there is no aeration ridge for a long time. The steps are severely scoured and the dam safety hazards. After consulting a large number of technical materials, Ahai Power Station adopts 5 holes for discharge, and the peak flow rate reaches 17,500 m in 5000 years. 3 /s, the peak discharge reaches 15300 m once in 1000 3 /s, the peak discharge reaches 12200 m once in 100 years 3 /s, it is a high-head and large-flow power station. In the 1:60 hydraulic model experiment, it was found that the Y-shaped wide-tail pier caused the negative pressure of the steps to increase when the water flow was contracted, the cavitation erosion was serious, and the energy dissipation of the steps was not fully utilized. The overall energy dissipation effect has a greater impact.
[0024] Based on the hydraulic model test results, the body shape is optimized, and at the same time, in order to ensure the safety and reliability of the dam body, the application range of the combined energy dissipater of the present invention is controlled under the condition of high water head and small flow. The combined energy dissipater of the present invention (see figure 1 ) By the diffuse flared tail (see figure 2 , image 3 ) And inverted "V" ladder energy dissipater (see Figure 5 ) Composition, the diffusion type wide tail pier will not cause the negative pressure of the steps to increase, cavitation and cavitation. The inverted "V"-shaped ladder makes the energy dissipation effect of the ladder fully utilized, and the aeration ridge 8 is added, so the energy dissipation effect is better. good.

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Description & Claims & Application Information

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