Graded flow configuration energy dissipation method for deflecting water streams

Abstract

The invention discloses a graded flow configuration energy dissipation method for deflecting water streams. The method comprises the step that the water streams deflected by a plurality of outlet structures are graded in the longitudinal direction of a stilling basin and are arranged with the flow increasing grade by grade, wherein the distance of the water streams between the grades is at least 20 meters under the premise that Li-H cot (ai) +H cot (ai+1) is satisfied, the flows of all deflected water streams in the same grade in the transverse direction are equal, and the distance Li(j) between every two defected water streams is at least 20 meters. According to the method, the water streams with smaller flows can sequentially and firstly enter the stilling basin and move at the bottom and the secondary bottom of the stilling basin; on one hand, the water streams will not cause impact damage and abrasion damage to the bottom of the stilling basin, and on the other hand, a better overall energy dissipation effect can be achieved between the water streams and between the water streams and turbulence areas which are sequentially produced by the water streams and a part of existing water body at the bottom of the stilling basin; meanwhile, impact damage and abrasion damage to the stilling basin by the subsequent water streams with larger flows can be greatly relieved, and therefore the safe operation of hydraulic engineering is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of flood discharge and energy dissipation in water conservancy and hydropower projects, and in particular relates to a method for grading flow configuration and energy dissipation for pick-up streams. Background technique [0002] The deflected flow energy dissipation method adopted in the flood discharge of water conservancy and hydropower projects is characterized in that the free jet water tongue first diffuses and aerates in the air, and at the same time consumes part of the energy, and then falls into the downstream stilling pool to form a submerged jet. cutting and turbulent diffusion to dissipate energy. In order to improve the energy dissipation effect and weaken the scour of the jet stream to the downstream, different methods are often used to disperse the jet stream as much as possible before entering the downstream river channel. The existing technology mainly adopts two methods to solve this prob...

AI Technical Summary

Problems solved by technology

The first method is that when a single spillway is used in a water conservancy project to discharge water, by optimizing the design of the pick-up form at the end of the spillway, the water flowing through the pick-up can be fully diffused in the air after leaving the pick-up, and dispersed as much as possible into the downstream consumption. However, as the flow rate of the discharged water increases, the difficulty of improving the diffusion effect of the water flow by optimizing the form of the ridge increases rapidly, and the discharged water is easily concentrated into the stilling pond, causing erosion damage to the stilling pond

The second method is that when multiple spillways (such as dam body spillway and bank spillway) are used in water conservancy projects to discharge water, although the total amount of water discharged can be dispersed to a certain extent, the scouring damage caused by stilling basins can be reduced to a certain extent. , but because there is no clear distribution relationship between the flows of each spillway, on the one hand, it is impossible to make full use of the interaction relationship between each spillway jet water flow into the downstream stilling basin to improve the overall flood discharge and energy dissipation effect. On the other hand, due to the excessive and relatively concentrated jet flow of the dam spillway, it will cause impact damage to the stilling basin, affecting the safe operation of water conservancy projects.

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