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Alien Ladder Energy Dissipator

A technology of energy dissipators and ladders, applied in water conservancy projects, marine engineering, coastline protection and other directions, can solve problems such as increasing project cost, large impact force, increasing load, etc., to avoid cavitation damage, improve anti-cavitation erosion, improve The effect of energy dissipation rate

Active Publication Date: 2014-10-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the uniform and continuous "V"-shaped ladder can increase the energy dissipation rate and improve the water flow structure, it has the following disadvantages: 1. Since the original straight line "-" shape of the ladder boundary is transformed into a broken line "V" shape with sharp convex angles, therefore The "water fin" phenomenon is very easy to occur on the first few steps. The so-called "water fin" phenomenon refers to the water tongue formed by the water flowing down due to the high speed, and the shape of the water flow side wall suddenly changes. The impact force is greater than the gravity of the water tongue, and the reaction force of the step surface changes the direction of the jet flow, and the water tongue is projected and crosses several steps.
2. The occurrence of the "water fin" phenomenon will cause the water flow to cross the side wall of the spillway and scour the bank slope or the foundation of adjacent buildings, thus affecting the safe operation of the building
3. If the phenomenon of "water fin" is not weakened or eliminated, the design height of the side wall of the spillway will inevitably be increased and the project cost will be increased
5. When the water tongue jumps away from several steps and directly acts on a certain step after being projected, it will increase the load of the step and affect the stability of the step
In summary, the potential problems associated with the "water fin" phenomenon make uniform continuous "V" shaped steps much less practical in practical engineering

Method used

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  • Alien Ladder Energy Dissipator
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, the structure of the special-shaped ladder energy dissipator is as follows: figure 1 , figure 2 As shown, it includes a straight section 1 next to the water inlet, and a special-shaped stepped section 2 connected to the straight section. The steps of the special-shaped stepped section 2 are "W" shaped. The distance between pile numbers 1 of the straight section is 17m, and the distance between pile numbers of the special-shaped stepped section 2 is 108m. The bottom slope slopes of the special-shaped stepped section and the straight section are the same, the slope angle θ of the bottom slope is 18.4°, and the single-width flow rate is 80m 3 / s.m. The length and height of the "W"-shaped steps 3-1 at all levels are the same, the two convex angles 7 are symmetrical to the central axis 6 of the flow surface, and the length L of the single-stage "W"-shaped steps a =9m, height h a =3m, the angle α=120° of the two salient angles 7.

[0032] Experimenta...

Embodiment 2

[0034] In this embodiment, the structure of the special-shaped ladder energy dissipator is as follows: image 3 , Figure 4 shown. The difference from Example 1 is that the straight section 1 is provided with a pre-aeration sill 4 . The aeration sill is set at a distance of 7m from the starting point of the first-level "W"-shaped ladder, its slope ratio is i=1:3, its side is perpendicular to the straight section, and its height is h c = 0.5m.

[0035] Experimental tests show that: compared with the continuous uniform "V"-shaped ladder of the same size (the discharge single-width flow rate is 80m3 / s.m), the water flow state of the special-shaped ladder energy dissipator in this embodiment is basically wall-attached flow, and the phenomenon of "water fin" is obviously weakened; there are basically no vacant steps; the overall flow state is stable, and the unused step section The height of the upper edge of the water tongue is reduced by about 55%, the energy dissipation rate...

Embodiment 3

[0037] In this embodiment, the structure of the special-shaped ladder energy dissipator is as follows: figure 1 , figure 2 As shown, it includes a straight section 1 next to the water inlet, and a special-shaped stepped section 2 connected to the straight section. The steps of the special-shaped stepped section 2 are "W" shaped. The distance between the pile numbers of the straight section 1 is 12m, and the distance between the pile numbers of the special-shaped stepped section 2 is 36m. The slope of the bottom slope of the special-shaped stepped section and the straight section is the same, the inclination angle θ of the bottom slope is 45°, and the single-width flow rate is 80m 3 / s.m. The length and height of the "W"-shaped steps 3-1 at all levels are the same, the two convex angles 7 are symmetrical to the central axis 6 of the flow surface, and the length L of the single-stage "W"-shaped steps a = 2.5m, height h a =2.5m, the angle α of the two salient angles 7=60°. ...

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Abstract

The invention discloses a special stepped energy dissipater, which comprises a straight section closely connected to a water inlet and a special stepped section connected with the straight section, wherein the steps of the special stepped section have a W shape or an omega shape; the bottom slope gradient of the special stepped section and the bottom slope gradient of the straight section are same; the length ratio of the straight section to the special stepped section is 1:(1-10); the length and height of the steps of the special stepped section are same; and the length of the steps is 0.4-18m and the height of the steps is 0.5-3m. A front aerator is arranged on the straight section to improve the cavitation erosion resistance.

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 (cave) or dam surface overflow. Background technique [0002] Tian Zhong et al disclosed a "V"-shaped stepped spillway in the Journal of Sichuan University (Engineering Science Edition) (see Volume 42, No. 2, P21-25, March 2010), which is composed of uniform and continuous "V"-shaped steps . After numerical simulation and physical model verification, its water flow structure and energy dissipation effect have indeed changed greatly compared with the traditional uniform continuous "one"-shaped ladder. The continuous "V"-shaped stepped vortex structure presents the characteristics of 3-element flow. Under the same body shape, the energy dissipation rate of the uniform and continuous "V"-shaped step is higher than that of the traditional uniform and continuous "one"-shaped step. Although the unifor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06
Inventor 张建民许唯临刘善均王韦邓军曲景学田忠张法星周茂林聂境余飞崔瑞
Owner SICHUAN UNIV