Energy dissipation structure capable of adjusting tail sill height of stilling basin and adjusting method thereof

A stilling pool and adjustable technology, which is applied in sea area engineering, construction, barrage/weir, etc., can solve the problems of the stability of the water flow in the stilling pool, the low energy dissipation efficiency of the stilling pool, the stability of the bottom plate of the stilling pool, etc. Achieve the effect of improving the atomization phenomenon, increasing the energy dissipation rate and weakening the impact force

Inactive Publication Date: 2018-11-16
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0007] Aiming at the problems of the stability of the water flow in the stilling tank, the low energy dissipation efficiency of the stilling tank and the stability of the bottom plate of the stilling tank in the current discharge and energy dissipation design of hydraulic structures, the invention provides an adjustable tail sill of the stilling tank High energy dissipation structure and its adjustment method

Method used

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  • Energy dissipation structure capable of adjusting tail sill height of stilling basin and adjusting method thereof
  • Energy dissipation structure capable of adjusting tail sill height of stilling basin and adjusting method thereof
  • Energy dissipation structure capable of adjusting tail sill height of stilling basin and adjusting method thereof

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Effect test

Embodiment 1

[0029] Embodiment 1: as figure 1 with 4 As shown, when the weir crest single width discharge is 180m 3 When the single-width flow rate is within the range of / s·m or even smaller, the hydraulic jacking device 5 is not adjusted, and the overall operation is carried out at the original height of the tail sill 4 of the stilling basin. In this case, the stability of the overall water flow in the stilling basin 3 is improved, and the hydrostatic pressure on the bottom plate of the stilling basin can be reduced to a certain extent, which is beneficial to the stability of the bottom plate of the stilling basin, and can make the water in the stilling basin The overall hydraulic characteristics are optimal, including energy dissipation rate, water surface fluctuation, water depth of stilling basin, flow velocity near the bottom of stilling basin, and hourly average pressure on the bottom of stilling basin, etc. The water in the pool flows downstream more smoothly; compared with the s...

Embodiment 2

[0030] Embodiment 2: as figure 2 with 5 As shown, when the single-width flow rate of the water flow over the weir crest is 180m 3 / s·m and higher single-width flow rate, a certain degree of energy dissipation in the stilling basin is required, and the height H of the tail sill 4 of the stilling basin can be changed by the hydraulic jacking device 5 . The required height H is different under different flow rates. First, when the height H of the tail sill 4 of the stilling basin needs to be increased, the volume V of the main hydraulic cylinder 5-2 can be reduced by the main hydraulic pump 5-1, and by Adjust the opening of the main hydraulic valve 5-3 to control the liquid flow Q in the hydraulic main pipeline 5-4, so that the rising speed of the tail sill 4 of the stilling pool will not be too fast. When the volume V of the main hydraulic cylinder 5-2 decreases When the volume v of the auxiliary hydraulic cylinder 5-5 increases, the auxiliary jacking column 5-6 is forced to ...

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Abstract

The invention relates to an energy dissipation structure capable of adjusting the tail sill height of a stilling basin and an adjusting method thereof. The energy dissipation structure comprises a step overflow dam, a WES ogee section and the stilling basin, wherein the step overflow dam, the WES ogee section and the stilling basin are sequentially connected; a stilling basin tail sill is arrangedat the tail end of the stilling basin; a hydraulic lift-up device is arranged at the bottom of the stilling basin tail sill; and the height of the stilling basin tail sill can be adjusted through thehydraulic lift-up device. Through optimizing the integral stilling basin tail sill, different heights of the stilling basin tail sill can be adopted under different flow rate conditions, so that theintegral stability of the bottom plate of the stilling basin and the turbulence degree of the water flow regime are buffered to different degrees, the bottom stability of the stilling basin and stability of bank slopes on both banks are protected favorably, and the energy dissipation rates under various levels of flow rates are increased to different degrees.

Description

technical field [0001] The invention relates to an energy dissipation structure capable of adjusting the height of the tail sill of a stilling pool and an adjustment method thereof, belonging to the field of flood discharge and energy dissipation of hydraulic structures in water conservancy and hydropower projects. Background technique [0002] In the design of dam engineering, flood discharge and energy dissipation are the two major tasks undertaken by the discharge structure, that is, to safely discharge excess flood water while strictly controlling the erosion of the dam body and downstream foundation pit by the discharge flow to prevent damage to the dam body and instability of the dam foundation . Especially for flood discharge projects with high water head and large flow, there are problems such as large flow velocity and pulsating pressure at the bottom of the bottom plate, high difficulty in anti-shock protection, large size of stilling basin required, and high cost....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B8/06
CPCE02B8/06
Inventor 杨具瑞汤建青郭莹莹张勤叶小胜
Owner KUNMING UNIV OF SCI & TECH
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