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Ladder energy dissipater with doped gas device preposed

An energy dissipating and gas device technology, applied in water conservancy projects, marine engineering, coastline protection, etc., can solve the problems of difficult control of aeration amount and aeration concentration, additional gas supply equipment, etc. Air volume is easy to control, easy to optimize the effect

Inactive Publication Date: 2008-06-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Michael Pfister and Willi H. Hager (2006) have studied the form of setting vent holes under the first step before the surface self-aeration reaches the bottom to protect the first few steps, but this pre-aeration type has The gas volume and aeration concentration are not easy to control or need additional gas supply equipment, etc.

Method used

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  • Ladder energy dissipater with doped gas device preposed
  • Ladder energy dissipater with doped gas device preposed
  • Ladder energy dissipater with doped gas device preposed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The ladder energy dissipation device of the pre-aeration device in this embodiment is used in the project hub of the power station, and the catchment area of ​​the power station is 5317km 2 , the controlled catchment area of ​​the plant site is 5754km 2 . The maximum working head of the spillway of the power station is 140m, and the maximum discharge flow is 760m 3 / s, the designed spillway width is 10m, the bottom slope gradient θ is 18°, and the maximum single-width flow rate is 76m 3 / s.m.

[0037]The structure of the stepped energy dissipator of the pre-aeration device in this embodiment is shown in Fig. 3 and Fig. 4, including a step 4 arranged on the bottom slope 1 of the spillway and an aeration device located upstream of the step. The aeration device is composed of a ridge 2, a ventilation hole 3 and an aeration shaft 7; the ridge 2 is arranged on the bottom slope 1 of the spillway, and its shape is a "wedge", its slope i is 1:5, and its height Δ 1 =1m, the ...

Embodiment 2

[0041] The stepped energy dissipator of the pre-aeration device in this embodiment is used for a single-width flow rate of 50-70m 3 / s.m, and the dam surface overflow bottom slope gradient θ is 13° as a hydropower project hub.

[0042] The structure of the stepped energy dissipator of the pre-aeration device in this embodiment is shown in Fig. 7 and Fig. 8, including a step 4 arranged on the bottom overflow slope 1 of the dam surface and an aeration device located upstream of the step. The aeration device is composed of a ridge 2, an aeration tank 8, a ventilation hole 3 and an aeration well 7; the ridge 2 is arranged on the overflow bottom slope 1 of the dam surface, and its shape is a "wedge block", and its slope i is 1:10, its height Δ 1 = 0.5m, the distance L between the rear end surface and the front end of the first step in the ladder 0 = 42m; the aeration tank 8 is located on the overflow bottom slope of the dam surface and under the ridge 2, the depth of the tank Δ =...

Embodiment 3

[0045] The stepped energy dissipator of the pre-aeration device in this embodiment is used for a single-width flow rate of 50-70m 3 / s.m, and the spillway bottom slope gradient θ is 15° as a hydropower project hub.

[0046] The structure of the stepped energy dissipator of the pre-aeration device in this embodiment is shown in Figure 11 and Figure 12, including a step 4 arranged on the bottom slope 1 of the spillway and an aeration device located upstream of the step. The aeration device is composed of a lifting ridge 2, a falling ridge 9, a ventilation hole 3 and an aeration well 7; the lifting ridge 2 is arranged on the bottom slope 1 of the spillway, and its shape is a "wedge block", and its slope i is 1:10. its height Δ 1 = 0.5m, the distance L between the rear end surface and the front end of the first step in the ladder 0 = 39.78m; drop sill 9 is located on the bottom slope of the spillway and below sill 2, drop sill height Δ 2 = 1.5m; there are two ventilation holes ...

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Abstract

The invention relates to a stepped energy dissipater, which comprises steps arranged on a bottom slope and an aerating device positioned on the upstream of the steps. The aerating device is provided with four structural forms. In the first structural form, the aerating device is composed of a flip bucket, a vent hole and a vent shaft, in the second structural form, the aerating device is composed of a flip bucket, an aeration slot, a vent hole and a vent shaft, in the third structural form, the aerating device is composed of a flip bucket, a step-down floor, a vent hole and a vent shaft, and in the fourth structural form, the aerating device is composed of a flip bucket, a step-down floor, an aeration slot, a vent hole and a vent shaft. The energy dissipater can not only enhance the stepped energy dissipation rate, but also reduce or avoid the possibility of the cavitation corrosion and the damage to the steps, and thereby effectively solve the problems of the contradiction between the increase of the energy dissipation rate and the improvement of the cavitation corrosion and the damage resistance when an overflow spillway or an overflow dam surface is operated with large discharge per unit width.

Description

technical field [0001] The invention belongs to energy dissipation facilities in water conservancy and hydropower projects, in particular to a stepped energy dissipation facility for spillway or dam surface overflow. Background technique [0002] Engineering practice shows that in the case of large flow and high head (single width flow q>50m 3 / s-m), the energy dissipation rate of the stepped energy dissipator will decrease, and it is difficult to ventilate, easy to cavitate, and may cause cavitation damage, so its application range is greatly limited. less than 50m 3 / s-m. In order to increase the scope of application of the stepped energy dissipator, some scholars have combined the aerated diverter pier with sufficient diffusion and no cavitation concern with the stepped energy dissipator, making full use of the water flow dispersion and strong mixing of the aerated diverter pier. The effect of aeration can greatly reduce the depth of slippage water flow on the stepp...

Claims

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Application Information

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IPC IPC(8): E02B8/06
Inventor 许唯临张建民刘善均王韦曲景学邓军彭勇李贵吉张毅驰
Owner SICHUAN UNIV
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