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A first-stage transition step aerated structure and energy dissipation method with variable elevation angle and plane angle

A technology of changing elevation and plane angle, applied in marine engineering, construction, barrage/weir, etc., can solve problems such as cavitation and cavitation damage of stepped spillway, and achieve the improvement of atomization phenomenon, significant energy dissipation effect, and change The effect of water flow

Active Publication Date: 2020-01-10
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the large area of ​​cavitation and cavitation damage in the stepped spillway in the current discharge and energy dissipation design of large-scale hydraulic structures with high water head, it is also found that there is negative pressure on the stepped surface through instrument measurement. The present invention provides a Air-mixing structure and energy dissipation method of the first transition step with variable elevation angle and plane angle

Method used

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  • A first-stage transition step aerated structure and energy dissipation method with variable elevation angle and plane angle
  • A first-stage transition step aerated structure and energy dissipation method with variable elevation angle and plane angle
  • A first-stage transition step aerated structure and energy dissipation method with variable elevation angle and plane angle

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Embodiment 1

[0044] Embodiment 1: as Figure 1~12 As shown, a first-stage transitional aerated structure with variable elevation angle and plane angle, including WES curve section 1, WES straight section 2, WES anti-arc section 3, stilling pool 4, first-stage transition staircase elevation 5, First stage transition ladder plane 6, auxiliary hydraulic jacking device, main hydraulic jacking device, rotating shaft part 8, pressure sensor, controller, WES curve section 1 is connected with WES straight section 2, WES straight section 2 is connected with WES reverse arc section 3 Connection, the tail of the WES anti-arc section 3 is connected to the stilling pool 4, the front 4 of the stilling pool is connected to the first transitional ladder facade 5, the first transitional ladder facade 5 is located above the first transitional ladder plane 6, and the first transition The bottom of the lower end of the ladder facade 5 and the bottom of the rear end of the first transition step plane 6 are ins...

Embodiment 2

[0054] Embodiment 2: As shown in Fig. 4, the structure of this embodiment is the same as that of Embodiment 1, the difference is that the relative angle ο of the first transition step elevation 5 does not change, only for the first transition step plane 6 The relative angle Ѳ is adjusted, by adjusting the auxiliary hydraulic jacking device at the rear end of the transition step plane 6 of the first step, and through the auxiliary work of the rotating shaft 8 at the front end of the transition step plane 6 of the first step, so as to achieve the adjustment of the transition step plane 6 of the first step The change of the relative angle Ѳ. In this way, the concentration of air entrainment in the process of flood discharge and energy dissipation can be increased, and the degree of cavitation erosion suffered by the stepped surface can be reduced.

Embodiment 3

[0055] Embodiment 3: as image 3 As shown, the structure of this embodiment is the same as that of Embodiment 1, the difference is that the relative angle Ѳ of the transitional step plane 6 of the first step is not changed, and only the relative angle Ѳ of the transitional step elevation 5 of the first step is adjusted. Adjust the auxiliary hydraulic jacking device at the lower end of the transitional stepped facade 5 of the first stage, and perform auxiliary work through the rotating shaft 8 at the upper end of the transitional stepped facade 5 of the first stage, so as to achieve the relative angle ο of the transitional stepped facade 5 of the first stage. Change. In this way, the concentration of air entrainment in the process of flood discharge and energy dissipation can be increased, and the degree of cavitation erosion suffered by the stepped surface can be reduced.

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Abstract

The invention relates to an aeration structure and energy dissipation method of a vertical face angle and plane angle changing first level transition stair, and belongs to the field of aeration and cavitation reducing of hydraulic structures in hydraulic and hydro-power engineering. The purposes that the negative pressure is cut down and the air cavitation damage degree is reduced due to the factthat the angles of a first level vertical face stair and a plane stair of a WES overflow weir linear segment are changed freely are achieved. Through the optimization of the aspect of the first levelstair of the WES overflow weir linear segment, firstly, the negative pressure on the WES overflow weir linear segment stair is greatly reduced; secondly, the air cavitation damage degree of the WES overflow weir linear segment stair is obviously reduced; and thirdly, the whole flow state of water flow has no larger change under all levels, and it is indicated that the type of angle change does notaffect the normal flood discharge in actual engineering cases under the circumstances of cutting down the negative pressure and the air cavitation damage degree.

Description

technical field [0001] The invention relates to an aeration structure and an energy dissipation method of a first-stage transitional ladder with variable elevation angle and plane angle, and belongs to the field of aeration and corrosion reduction of hydraulic structures in water conservancy and hydropower projects. Background technique [0002] Stepped spillways have become a popular method of safe flood discharge over the past few decades. Due to the cumulative energy dissipation of the steps, the energy dissipation rate is improved, the disadvantages of centralized energy dissipation are avoided, and the operation of energy dissipation buildings is safer. Research by Rice et al. shows that under the same slope and different single-width discharge conditions, the energy dissipation rate of stepped overflow dams generally accounts for 48%-71% of the total energy, while the discharge section of smooth overflow dams under the same conditions The energy dissipation rate only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06
CPCE02B8/06
Inventor 杨具瑞汤建青郭莹莹任中成邱毅
Owner KUNMING UNIV OF SCI & TECH
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