CN207582437U - A kind of anti-cavitation curved Stepped Spillway of destruction - Google Patents
A kind of anti-cavitation curved Stepped Spillway of destruction Download PDFInfo
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- CN207582437U CN207582437U CN201721267127.5U CN201721267127U CN207582437U CN 207582437 U CN207582437 U CN 207582437U CN 201721267127 U CN201721267127 U CN 201721267127U CN 207582437 U CN207582437 U CN 207582437U
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- 230000006378 damage Effects 0.000 title claims abstract description 16
- 238000005276 aerator Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 238000005273 aeration Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 5
- 230000021715 photosynthesis, light harvesting Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 abstract description 2
- 230000007812 deficiency Effects 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 208000006265 Renal cell carcinoma Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 208000019465 refractory cytopenia of childhood Diseases 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
The utility model discloses a kind of anti-cavitation curved Stepped Spillways of destruction, are related to hydraulic and hydroelectric engineering technical field, are mainly arranged between WES weirs and stiling basin.Maintain traditional Stepped Spillway low water head, aeration is abundant under the conditions of small discharge per unit width, the advantages of energy dissipation rate is high, start with simultaneously from Stepped Spillway cavitation root, eliminate the condition that high-velocity flow downstairs wall surface cavitation occurs, the destruction that ladder is effectively prevent to occur due to aeration deficiency, Stepped Spillway is made no longer to rely only on air entraining facilities and mitigates the destruction of itself, the utility model and flaring gate pier and aerator etc. are used in combination, this technical barrier and discharge structure are destroyed to more high water head to solve high-velocity flow cavitation, the development of more large discharge per unit overcurrent condition provides reference scheme.The utility model build grace facilitates construction, applies to landscape design with higher ornamental value.
Description
Technical field
The utility model belongs to hydraulic and hydroelectric engineering technical field, is related to a kind of anti-cavitation curved Stepped Spillway of destruction.
Background technology
Stepped Spillway is used in as a kind of energy dissipater on dyke and drop, has more than 2500 years history, with the modern times
The continuous development of RCC technologies, the research of Stepped Spillway and applying are increased rapidly in multiple countries, incomplete statistics table
It is bright, at present the U.S., Brazil, Russia, South Africa, Canada, Britain, Norway, France, etc. more dams having built of country adopt
With Stepped Spillway technology.It is quite prominent the advantages of Stepped Spillway compared with traditional energy dissipater, consider from construction angle,
Convenient for mechanized construction, shorten the construction time, therefore engineering cost is greatly reduced, consider from hydraulics angle, due to step
Effect, according to come the different flows of flow along step fall or slide and under, when flow is fallen along ladder, by flow with
Collision between ladder and flow, in addition surrounding large quantity of air be involved in water body, form strong self aeration steam two phase flow；When
When Stepped Spillway occurs sliding stream, occurring vortex in ladder, the shearing between vortex and mainstream increases the exchange of energy,
The presence of vortex enhances water body turbulent fluctuation simultaneously, two kinds of fluidised forms by a large amount of energy dissipations of water body Stepped Spillway show so as to
Greatly reduce stiling basin length.
Although Stepped Spillway advantage is many, its dumping ratio is reduced with the increase of discharge per unit width, particularly Gao Shui
Head, the Slipper pair generated under large discharge per unit, slide the group that stream is actually the smooth flow-passing surface of tradition add it is rough, to group
For adding rough high-velocity flow, water cavity problem is necessarily faced, in order to solve Stepped Spillway cavitation corrosion Cavitation Problems, China is learned
Person is proposed to export setting flaring gate pier in Stepped Spillway upstream WES curved surfaces, the flip shot of flow is acted on using flaring gate pier, is reduced
Stepped Spillway inflow-rate of water turbine, but still unavoidable ladder cavitation destruction in order to solve this technical barrier, are usually overflowing
Air entraining facilities are added between stream dam and flaring gate pier, engineering is in practice often in Stepped Spillway chopped-off head step and WES curved surfaces junction
Aerator increases flow aeration rate, and Stepped Spillway is protected to be destroyed from cavitation corrosion cavitation, though obtain certain effect, band
Carry out certain negative effect, aerator be such as set, high-velocity flow by when, handed in Stepped Spillway chopped-off head step and WES curved surfaces
Place is met, ladder outer rim generates larger negative pressure, and the ineffective overfull dam surface destruction of aeration still remains.To solve this technology hardly possible
Topic, author propose that cavitation corrosion cavitation root, which occurs, from ladder starts with.Analyze that cavitation corrosion cavitation generates when having its source in aerial drainage in ladder
Negative pressure, and when sliding stream, cascaded surface generates vortex clockwise, is moved at about 0.3 times of ladder width on the inside of vortex horizontal steps
Direction deviates from horizontal plane, must generate pressure smallest point, similarly must also generate pressure smallest point in ladder vertical plane outer rim, work as vortex
When intensity is larger, pressure smallest point just will appear larger negative pressure, and cavitation corrosion cavitation is caused to be destroyed and is generated.Therefore cavitation corrosion cavitation is solved
Problem need to change vortex fluidised form, it is made not occur vortex of the direction of motion away from ladder in ladder wall surface.
Invention content
Curved Stepped Spillway is destroyed the utility model proposes anti-cavitation, mainly solves high water head, large discharge per unit cavitation
Cavitation corrosion problem.
The technical solution of the utility model is：A kind of anti-cavitation curved Stepped Spillway of destruction, including flaring gate pier, aeration
Bank, Ladder Overflow section, ogee section and stiling basin, Ladder Overflow section top connection aerator and flaring gate pier, lower section connection are anti-
Segmental arc and stiling basin, the vertical wall surface top of the Ladder Overflow section are provided with vertical braking section, and horizontal wall surface is close to vertical wall
Horizontal braking section is provided at face, Ladder Overflow section includes aerated cavity section and Stepped Spillway flow-passing surface, wherein vertical wall surface
Including aerated cavity section every grade of step in the vertical wall surface of the chopped-off head step of aerator and Stepped Spillway flow-passing surface
Vertical wall surface, horizontal wall surface include Stepped Spillway flow-passing surface in every grade of step horizontal wall surface；The vertical braking section
It is the curved surface of protrusion with horizontal braking section.
Further, the vertical braking section is the top vertex of the curved surface of arc line shaped, camber line end point and vertical wall surface
It overlaps, the length between camber line both ends is vertical wall surface length L10.5~1 times, camber line vertex it is vertical with vertical wall surface away from
From for h1, h1With vertical wall surface length L1The ratio between for α, α=0.01~0.06.
Further, the horizontal braking section is arc line shaped curved surface, and camber line end point is located at horizontal wall surface and vertical wall surface
Junction, the length between camber line both ends is horizontal wall surface length L20.5~1 times, camber line vertex and horizontal wall surface hang down
Straight distance is h2, h2With horizontal wall surface length L2The ratio between for β, β=0.013~0.067.
The operation principle of the utility model：The utility model carries out the horizontal and vertical wall surface of traditional Stepped Spillway excellent
Change, be equivalent on ladder and twice " deceleration strip " are set, play and destroy cavitation and cavitation erosion occurrence condition, while ladder is thin during to flood discharge
Weak position is strengthened, and on the one hand ladder protrusion is utilized to change vortex fluidised form so that in ladder vortex as possible far from ladder wall surface,
Develop to ladder center, play the role of destroying cavitation and cavitation erosion occurrence condition, simultaneously because circular arc causes with dispersion pressure power
It even if step generates negative pressure, also can relatively disperse, and mitigate the destruction to ladder.Different arcs can be set according to different requirement of engineering
Long and radius does not reduce overfall dam dam facing mistake with flaring gate pier and aerator conjunctive use merely with flaring gate pier flip shot flow action
Stream, while pre-aerator forces overflow bottom aeration, reduces the possibility of Stepped Spillway cavitation corrosion cavitation, and since ladder overflows
Flow " self-protection " on dam so that integrated energy dissipater strides forward to more high water head, more large discharge per unit.
The beneficial effects of the utility model：The anti-cavitation cavitation of the utility model destroys curved Stepped Spillway, simple in structure,
It is easy for construction, the destruction of cavitation corrosion cavitation is effectively reduced or eliminated, helps to reduce quantities, duration and cost, for water conservancy projects more
Further, reference is provided.
Description of the drawings
Fig. 1, Fig. 2 be the utility model and flaring gate pier, aerator, stiling basin combined energy dissipation mode work arrangement figure；
Fig. 3 is the utility model ladder side view；
Bumpy flow speed distribution map and the utility model cavitation prevention cavitation are destroyed curved in the respectively traditional ladder of Fig. 4, Fig. 5
Bumpy flow speed distribution map in Stepped Spillway；
Fig. 6 is the fluidised form figure that the utility model is applied to landscape design discharge structure；
In figure respectively marked as：The vertical braking sections of 1-, the horizontal braking sections of 2-, the vertical wall surfaces of 3-, 4- horizontal wall surfaces, 5- wide tails
Pier, 6- aerators, 7- Ladder Overflow sections, 8- ogee sections, 9- stiling basins.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1：As illustrated in fig. 1 and 2, this programme is the flaring gate pier+Ladder Overflow being used in combination with flaring gate pier, aerator
Dam+stiling basin integration Energy Dissipation Modes.It is described including flaring gate pier 5, aerator 6, Ladder Overflow section 7, ogee section 8 and stiling basin 9
7 top connection aerator 6 of Ladder Overflow section and flaring gate pier 5, lower section connection ogee section 8 and stiling basin 9, the Ladder Overflow section 7
3 top of vertical wall surface be provided with vertical braking section 1, horizontal wall surface 4 is provided with horizontal braking section 2, rank at vertical wall surface 3
Terraced overflow segment 7 includes aerated cavity section and Stepped Spillway flow-passing surface, wherein vertical wall surface 3 includes aerated cavity section close to aeration
The vertical wall surface of every grade of step in the vertical wall surface of the chopped-off head step of bank 6 and Stepped Spillway flow-passing surface, horizontal wall surface 4 wrap
Include the horizontal wall surface of every grade of step in Stepped Spillway flow-passing surface；The vertical braking section 1 and horizontal braking section 2 are protrusion
Curved surface.
Data show that flaring gate pier acts on the flip shot of flow, reduce Stepped Spillway inflow-rate of water turbine, but still unavoidable rank
Terraced cavitation destruction adds air entraining facilities usually between overfall dam and flaring gate pier, and engineering is in practice often in Stepped Spillway
Chopped-off head step and WES curved surfaces junction aerator, increase flow aeration rate, and Stepped Spillway is protected to be destroyed from cavitation corrosion cavitation,
Though obtaining certain effect, new engineering problem is brought, such as in Stepped Spillway chopped-off head step and WES curved surfaces junction,
Ladder outer rim generates larger negative pressure, and the ineffective overfull dam surface destruction of aeration still remains.This programme from extraneous aeration and
Hierarchic structure destroys two aspects of cavitation corrosion cavitation Production conditions and effectively solves high-velocity flow cavitation corrosion Cavitation Problems, is discharge structure
Reference scheme is improved to more high water head, the development of more large discharge per unit overcurrent condition.
Embodiment 2：As shown in figure 3, wherein vertical braking section 1 is the curved surface of arc line shaped, camber line end point and vertical wall surface 3
Top vertex overlap, the length between camber line both ends is vertical 3 length L of wall surface10.5~1 times, camber line vertex and vertical wall
The vertical range in face 3 is h1, h1With vertical 3 length L of wall surface1The ratio between for α, α=0.01~0.06.Wherein horizontal braking section 2 is arc
Linear curved surface, camber line end point are located at the junction of horizontal wall surface 4 and vertical wall surface 3, and the length between camber line both ends is level
4 length L of wall surface20.5~1 times, the vertical range of camber line vertex and horizontal wall surface 4 is h2, h2With 4 length L of horizontal wall surface2It
Than for β, β=0.013~0.067.
Vertical wall surface and horizontal wall surface length are respectively 0.5L in the present embodiment1And 0.5L2, α=0.01, β=0.013 passes through
Numerical simulation is observed as shown in Figure 4, Figure 5, observes bumpy flow speed distribution in Fig. 4 tradition ladders, it is found that it is empty that vortex generates cavitation corrosion
Change failure mechanism.Fig. 5 is that when vortex is flow at horizontal wall surface and vertical walls 1/2, fluidised form changes after improving, and forces rotation
Whirlpool is far from wall surface and to ladder development of central area, and middle part vortex intensity is maximum, and wall surface is due to " effect of deceleration strip " vortex intensity
Very little, and circular arc has the function of to disperse pressure, therefore wall surface will not generate larger negative pressure.
Embodiment 3：The conclusion that 2 numerical simulations obtain in conjunction with the embodiments, to stepped spillway, horizontal and vertical wall surface improves,
Vertical wall surface and horizontal wall surface length are respectively 0.55L1And 0.55L2, α=0.02, β=0.015 carries out water to improved model
Work is tested, and analysis of experimental results is found, step horizontal wall surface is bright inside 1/3 and apart from negative pressure on the inside of vertical wall surface
It is aobvious to reduce, it since other position negative pressure are smaller, therefore is not discussed, therefore cascaded surface negative pressure reduces the expected requirement of satisfaction, passes through
Above-mentioned steps can form cavitation prevention cavitation of the present invention and destroy curved Stepped Spillway and its function, can guarantee flood discharge
The safe handling of channel reduces quantities, duration and cost, and Cavitation Problems are more solved for water conservancy projects, provides reference, and use
There is higher ornamental value in landscape setting.
Embodiment 4：As shown in fig. 6, the vertical wall surface of the present embodiment and horizontal wall surface length are respectively L1And L2, α=0.06, β=
0.067.Apply to landscape design, non-water flow by when its build it is graceful, there is higher ornamental value, have flow by when,
Since " deceleration strip " acts on, flow is by ladder, and the water surface is uneven as the wave that is superimposed in layer is pushed ahead, and fluidised form is excellent
U.S. avoids flow from reducing the vibration that water impact generates cascaded surface because impact step horizontal face jumps up to form stronger down stream,
Stepped spillway is protected, extends its service life.
Specific embodiment of the present utility model is explained in detail above in conjunction with attached drawing, but the utility model is not
It is limited to the above embodiment, within the knowledge of a person skilled in the art, this practicality can also be not being departed from
Various changes can be made under the premise of novel objective.
Claims (3)
1. a kind of anti-cavitation curved Stepped Spillway of destruction, it is characterised in that：Including flaring gate pier（5）, aerator（6）, ladder overflows
Flow section（7）, ogee section（8）And stiling basin（9）, the Ladder Overflow section（7）Top connects aerator（6）And flaring gate pier（5）, under
Side's connection ogee section（8）And stiling basin（9）, the Ladder Overflow section（7）Vertical wall surface（3）Top is provided with vertical braking section
（1）, horizontal wall surface（4）Close to vertical wall surface（3）Place is provided with horizontal braking section（2）, Ladder Overflow section（7）Including aerated cavity
Section and Stepped Spillway flow-passing surface, wherein vertical wall surface（3）Including aerated cavity section close to aerator（6）Chopped-off head step it is perpendicular
The vertical wall surface of every grade of step in straight wall face and Stepped Spillway flow-passing surface, horizontal wall surface（4）Including Stepped Spillway mistake
The horizontal wall surface of every grade of step in stream interface；The vertical braking section（1）With horizontal braking section（2）It is the curved surface of protrusion.
2. the anti-cavitation curved Stepped Spillway of destruction according to claim 1, it is characterised in that：The vertical braking section
（1）For the curved surface of arc line shaped, camber line end point and vertical wall surface（3）Top vertex overlap, the length between camber line both ends is
Vertical wall surface（3）Length L10.5~1 times, camber line vertex and vertical wall surface（3）Vertical range be h1, h1With vertical wall surface
（3）Length L1The ratio between for α, α=0.01~0.06.
3. the anti-cavitation curved Stepped Spillway of destruction according to claim 1, it is characterised in that：The horizontal braking section
（2）For arc line shaped curved surface, camber line end point is located at horizontal wall surface（4）With vertical wall surface（3）Junction, between camber line both ends
Length is horizontal wall surface（4）Length L20.5~1 times, camber line vertex and horizontal wall surface（4）Vertical range be h2, h2With level
Wall surface（4）Length L2The ratio between for β, β=0.013~0.067.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721267127.5U CN207582437U (en) | 2017-09-29 | 2017-09-29 | A kind of anti-cavitation curved Stepped Spillway of destruction |
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| CN201721267127.5U CN207582437U (en) | 2017-09-29 | 2017-09-29 | A kind of anti-cavitation curved Stepped Spillway of destruction |
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| CN207582437U true CN207582437U (en) | 2018-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107663851A (en) * | 2017-09-29 | 2018-02-06 | 昆明理工大学 | A kind of anti-cavitation curved Stepped Spillway of destruction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107663851A (en) * | 2017-09-29 | 2018-02-06 | 昆明理工大学 | A kind of anti-cavitation curved Stepped Spillway of destruction |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20180706 Termination date: 20180929 |