Unsymmetrical stilling pool

Abstract

The invention provides a novel unsymmetrical stilling pool, comprising a drop sill, a stilling pool bottom plates connected with the downstream of the drop sill, and side walls arranged on two sides of the stilling pool bottom plate; the upper stream of the drop sill is connected with a base plate of an emptying hole; the upstream of the side walls on two sides is connected with side walls of theemptying hole; the stilling pool bottom plate is formed by sequentially connecting a straight section, an arc section and a slope section in the water flow direction, the tail end of an oblique cutting section is provided with an oblique cutting opening, the oblique cutting opening is connected with a river bank slope, and the side wall located on the upstream side of a river is shorter than the side wall located on the downstream side of the river through the oblique cutting direction of the oblique cutting opening. The unsymmetrical stilling pool is suitable for energy dissipation of bottomflow at the outlet of the emptying hole with a certain intersection angle between a medium-high water head hydropower station and a narrow river channel, and the problems of atomization and scouring of riverbeds and bank slopes caused by ski jump energy dissipation are avoided.

Description

technical field

[0001] The invention belongs to a flood discharge and energy dissipation facility used in water conservancy and hydropower projects, in particular to an energy dissipation and anti-scour facility for underflow energy dissipation at the outlet of a vent tunnel with a certain intersection angle between a medium-high water head hydropower station and a narrow river channel. Background technique

[0002] In water conservancy and hydropower projects, flood discharge and energy dissipation are very prominent key technical issues, and the energy dissipation and anti-scour downstream of the discharge structures are directly related to the safety of the project. According to a rough statistical analysis of a large number of actual engineering data, the cost of flood discharge and energy dissipation accounts for about 40% to 50% of the total project cost, and the cost of energy dissipation and anti-scour facilities accounts for 40% to 50% of the discharge structure. . ...

Examples

Embodiment 1

[0030] The maximum operating water head of a vent hole in a project is 120m, the end width of the vent hole is B=6m, and the maximum single-width flow rate is q=120m 3 / s.m, the angle between the central axis of the vent hole and the central line of the downstream channel θ=12°. The asymmetrical stilling basin with single-sided side wall diffusion is used for underflow energy dissipation at the outlet of the vent hole end of the medium-high head hydropower station.

[0031] The asymmetrical stilling pool diffused by the single-side side wall has a structure such as figure 1 , figure 2 As shown, it is composed of a sill, the bottom plate of the stilling pool connected to the downstream of the sill, and the side walls on both sides of the bottom plate of the stilling pool. The bottom plate of the stilling pool is connected by a straight section, an arc section, and a slope section in sequence along the water flow direction. The tangential direction makes the side wall on the...

Embodiment 2

[0035] The maximum operating water head of a vent hole in a project is 100m, the end width of the vent hole is B=6m, and the maximum single-width flow rate is q=100m 3 / s.m, the angle between the central axis of the vent hole and the central line of the downstream channel θ=20°. The asymmetrical stilling basin with double-sided side wall diffusion is used for underflow energy dissipation at the outlet of the vent tunnel end of the medium-high head hydropower station.

[0036] The asymmetrical stilling pool diffused by the single-side side wall has a structure such as image 3 , Figure 4 As shown, it is composed of a sill, the bottom plate of the stilling pool connected to the downstream of the sill, and the side walls on both sides of the bottom plate of the stilling pool. The bottom plate of the stilling pool is connected by a straight section, an arc section, and a slope section in sequence along the water flow direction. The tangential direction is such that the side wa...

Embodiment 3

[0040] The maximum operating water head of a vent hole in a project is 70m, the end width of the vent hole is B=6m, and the maximum single-width flow rate is q=80m 3 / s.m, the included angle θ=30° between the central axis of the vent hole and the central line of the downstream channel. The asymmetrical stilling basin with double-arc diffusion is used for underflow energy dissipation at the outlet of the vent tunnel end of the medium-high head hydropower station.

[0041] The asymmetrical stilling pool diffused by the single-side side wall has a structure such as Figure 5 , Image 6 As shown, it is composed of a sill, the bottom plate of the stilling pool connected to the downstream of the sill, and the side walls on both sides of the bottom plate of the stilling pool. The bottom plate of the stilling pool is connected by a straight section, an arc section, and a slope section in sequence along the water flow direction. The tangential direction is such that the side walls o...

technical field

[0001] The invention belongs to a flood discharge and energy dissipation facility used in water conservancy and hydropower projects, in particular to an energy dissipation and anti-scour facility for underflow energy dissipation at the outlet of a vent tunnel with a certain intersection angle between a medium-high water head hydropower station and a narrow river channel. Background technique

[0002] In water conservancy and hydropower projects, flood discharge and energy dissipation are very prominent key technical issues, and the energy dissipation and anti-scour downstream of the discharge structures are directly related to the safety of the project. According to a rough statistical analysis of a large number of actual engineering data, the cost of flood discharge and energy dissipation accounts for about 40% to 50% of the total project cost, and the cost of energy dissipation and anti-scour facilities accounts for 40% to 50% of the discharge structure. . ...

Examples

Embodiment 1

[0030] The maximum operating water head of a vent hole in a project is 120m, the end width of the vent hole is B=6m, and the maximum single-width flow rate is q=120m 3 / s.m, the angle between the central axis of the vent hole and the central line of the downstream channel θ=12°. The asymmetrical stilling basin with single-sided side wall diffusion is used for underflow energy dissipation at the outlet of the vent hole end of the medium-high head hydropower station.

[0031] The asymmetrical stilling pool diffused by the single-side side wall has a structure such as figure 1 , figure 2 As shown, it is composed of a sill, the bottom plate of the stilling pool connected to the downstream of the sill, and the side walls on both sides of the bottom plate of the stilling pool. The bottom plate of the stilling pool is connected by a straight section, an arc section, and a slope section in sequence along the water flow direction. The tangential direction makes the side wall on the...

Embodiment 2

[0035] The maximum operating water head of a vent hole in a project is 100m, the end width of the vent hole is B=6m, and the maximum single-width flow rate is q=100m 3 / s.m, the angle between the central axis of the vent hole and the central line of the downstream channel θ=20°. The asymmetrical stilling basin with double-sided side wall diffusion is used for underflow energy dissipation at the outlet of the vent tunnel end of the medium-high head hydropower station.

[0036] The asymmetrical stilling pool diffused by the single-side side wall has a structure such as image 3 , Figure 4 As shown, it is composed of a sill, the bottom plate of the stilling pool connected to the downstream of the sill, and the side walls on both sides of the bottom plate of the stilling pool. The bottom plate of the stilling pool is connected by a straight section, an arc section, and a slope section in sequence along the water flow direction. The tangential direction is such that the side wa...

Embodiment 3

[0040] The maximum operating water head of a vent hole in a project is 70m, the end width of the vent hole is B=6m, and the maximum single-width flow rate is q=80m 3 / s.m, the included angle θ=30° between the central axis of the vent hole and the central line of the downstream channel. The asymmetrical stilling basin with double-arc diffusion is used for underflow energy dissipation at the outlet of the vent tunnel end of the medium-high head hydropower station.

[0041] The asymmetrical stilling pool diffused by the single-side side wall has a structure such as Figure 5 , Image 6 As shown, it is composed of a sill, the bottom plate of the stilling pool connected to the downstream of the sill, and the side walls on both sides of the bottom plate of the stilling pool. The bottom plate of the stilling pool is connected by a straight section, an arc section, and a slope section in sequence along the water flow direction. The tangential direction is such that the side walls o...

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