Differential type high and low sill deflecting energy dissipator-high sill type stilling pool system and energy dissipation method

Abstract

The invention discloses a differential type high-low threshold trajectory bucket energy dissipater-high-drop-threshold type stilling pool system and an energy dissipation method, and relates to the technical field of high-dam flood discharge energy dissipation. The system comprises a differential type high-low threshold trajectory bucket energy dissipater, a high-drop-threshold type stilling pooland an intelligent control unit. According to the differential type high-low threshold trajectory bucket energy dissipater, the longitudinal separation, the transverse expansion and the air collisionenergy dissipation of discharged water flow are realized; the high-drop-threshold type stilling pool is used for carrying a water tongue which enters in the form of an oblique impact jet flow, the jetflow generates the mixed flow state which submerges the jet flow and a hydraulic pump transition in the high-drop-threshold type stilling pool, and the energy is greatly dissipated; and the intelligent control unit is used for controlling the working state of the high-drop-threshold type stilling pool by analyzing the signals of a water level sensor. The collision energy dissipation is carried out through trajectory bucket collision, turbulence shearing, turbulence diffusion and submerging of the hydraulic jump, so that the energy dissipation effect is remarkably improved, and the scouring ofhigh-speed discharge water flow to a downstream riverbed is reduced; and meanwhile, the length of the stilling pool is shortened, an apron is not needed to be arranged at the bottom of the stilling pool, and the construction cost is reduced.

Description

technical field [0001] The invention relates to the field of flood discharge and energy dissipation of high dams, in particular to a differential high and low sill deflector energy dissipator-high drop sill type stilling pool system. Background technique [0002] With the improvement of water energy development and utilization rate, my country has built or is building a large number of large-scale water conservancy projects with the world's leading level. After the high dam reservoir is completed, it can produce significant economic benefits in many fields such as flood control, power generation, shipping and irrigation, but the high dam also puts forward higher requirements for the design of flood discharge and energy dissipation, especially some high arch dams in Southwest my country. For example, Ertan, Xiaowan and Xiluodu, etc., because the dam site is located in a narrow valley, a large amount of flood needs to be released through the dam body. [0003] The deflection f...

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Problems solved by technology

[0003] The deflection flow energy dissipation is a commonly used form of energy dissipation. The deflection flow energy dissipation tool has the advantages of simple structure, convenient construction, saving engineering costs, and strong adaptability to the amplitude of tail water. The disadvantage is that the downstream local scour is serious, and the tail water The range of water fluctuation and atomization is large, so it is necessary to set up corresponding engineering protection measures

[0004] The falling sill type stilling pool is a new energy dissipator with good application prospects. The sill is formed by excavating at a certain depth at the entrance of the stilling pool. The jet flow reaches the bottom plate, and dissipates energy through turbulent shearing with the water body in the stilling pool. The lower part of the water tongue forms a clockwise rolling, and the front of the water tongue forms a submerged hydraulic jump. There is a gap of certain thickness between the main flow and the bottom plate. "Water cushion", thereby reducing the average pressure and flow velocity at the bottom of the stilling tank when the water tongue reaches the bottom plate; but the falling sill type stilling tank still cannot avoid the impact damage of the jet water tongue to the bottom plate, and at the same time cannot fully disinfect the jet water tongue Therefore, the existing drop-sill type stilling basin is long in length, and the bottom still needs to be equipped with apron, which requires a huge amount of construction work and cost

At the same time, in order to ensure that the downstream river course will not be damaged by water erosion, energy dissipation and anti-scour facilities such as sea diffusers should also be installed at the tail sill of the stilling pool, which will also increase the amount of construction work and cost

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