CN205421200U - A class dissipation structure is chosen in outlet structure escape works export - Google Patents
A class dissipation structure is chosen in outlet structure escape works export Download PDFInfo
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- CN205421200U CN205421200U CN201620218352.9U CN201620218352U CN205421200U CN 205421200 U CN205421200 U CN 205421200U CN 201620218352 U CN201620218352 U CN 201620218352U CN 205421200 U CN205421200 U CN 205421200U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000009792 diffusion process Methods 0.000 abstract description 13
- 238000005406 washing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 4
- 238000009991 scouring Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000003628 erosive Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000037408 Distribution ratio Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000149 penetrating Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
The utility model discloses a hydraulic engineering's dissipation structure, especially a class dissipation structure is chosen in outlet structure escape works export. The utility model provides a a class dissipation structure is chosen in outlet structure escape works export who moves the water pressure who reduces that the side wall bore, include by choosing class structure bottom plate and choosing class structure of choosing that class structure side wall constitutes, choosing class exit end of the structure bottom plate warpage that makes progress, choosing class structure side wall setting and choosing class both sides of structure bottom plate, the breach that still includes the in the form of slot suddenly falls the chute, the breach suddenly falls the chute setting and is choosing class exit end of structure bottom plate and extending to the delivery port department that chooses class structure. The utility model discloses choose vertical diffusion degree that class dissipation structure strengthened rivers greatly, through aerial diffusion, collision, reduced unit area's the income water yield to the washing out ability of trajectory nappe to the riverbed has been reduced.
Description
Technical field
This utility model relates to the energy-dissipating structure of a kind of hydraulic engineering, especially a kind of outlet structure escape works outlet flip trajectory bucket structure.
Background technology
According to conditions such as engineering geology, landform, the hydrology, high-velocity flow outlet structure escape works jet bucket Dam Configuration Design not only to be used stream of carrying water and be returned groove smoothly, and to increase dispersion of flow degree of growing as far as possible, enter the flow in water unit are to reduce the current scouring capability to downstream river course with the skyborne blending of increased water flow, turbulent fluctuation, friction energy dissipation and reduction overflow.
In current longitudinal diffusion energy dissipater, narrow slit energy dissipating be can yet be regarded as a kind of preferably energy dissipater, but owing to the longitudinal stretching overflow of Slit-type Bucket Jets energy-dissipating structure is to be formed by forcing under the pinch confinement effect of both sides abutment wall, therefore abutment wall can be caused powerful percussion by current, abutment wall stress is relatively big, is likely to be breached the 40%～60% of gross head when big discharge.And owing to the pinch confinement effect of both sides abutment wall makes the depth of water high along Cheng Yong, thus abutment wall is the highest, high-velocity flow may vibrate by induction body of wall, carries out Vibration as the left bank ski trail of wujiangdu hydropower station is led wall by nineteen eighty-two～1987, has obvious dynamic respons.From three former sight Analysis on Results: left bank ski trail is led the vibration of wall and strengthened year by year, i.e. 160 μm from nineteen eighty-two increase to the 3.1mm of 1987.Abutment wall stress is big and body of wall vibration makes structure design, difficulty of construction and investment cost be greatly increased.Further, since the restriction of the requirement of high-velocity flow fluid stable, i.e. shrinkage ratio in choosing bank, Slit-type Bucket Jets energy-dissipating structure is longer along longitudinal length, do not adapt to China's western part hydroelectric project due to downstream river course narrow, limited problem is arranged in the outlet that geological conditions is poor etc. brings
The most differential flip trajectory bucket structure is also intended to increase overflow longitudinal diffusion degree, but it is mainly used in the table hole of dam body flow velocity the highest (being approximately less than 16m/s), due to the cavitation erosion of out-of-flatness easily recurring structure on surface when flow velocity is higher.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of outlet structure escape works outlet flip trajectory bucket structure that can make current longitudinal diffusion reducing the flowing pressure that abutment wall is born.
This utility model solves the outlet structure escape works outlet flip trajectory bucket structure that its technical problem is used, including by choose flow structure base plate and choose that flow structure abutment wall constitutes choose flow structure, the described port of export choosing flow structure base plate is upturned, choose flow structure abutment wall and be arranged on the both sides choosing flow structure base plate, also including that breach in the form of slot is prominent and fall chute, described breach is dashed forward and is fallen chute and be arranged on and choose the port of export of flow structure base plate and extend to choose the water outlet of flow structure.
Further, choosing flow structure described in is symmetrical formula, forward inclined cutout or reverse inclined cutout.
Further, breach is dashed forward and is fallen chute along the minimum length flowed to downstream not less than the width choosing flow structure base plate.
Further, breach is dashed forward and is fallen chute and be arranged on the middle part choosing flow structure base plate, and the prominent chute front opening width that falls of breach is less than end A/F.The relative position of front end and end is all using water (flow) direction as reference.
Further, breach is dashed forward, and to fall chute front opening width be choose flow structure baseplate width 0.1～0.7, and breach is dashed forward, and to fall chute distal opening width be choose flow structure baseplate width 0.8～0.95.
Further, the prominent chute front opening position of falling of breach is chosen angle and is chosen angle less than distal portion.
Further, breach is prominent to fall chute front opening position and chooses angle not less than-10 °, and distal opening two ends are chosen angle and are not more than 45 °, and the difference of two angles is not less than 15 °.
Further, breach dashes forward the step height falling chute not less than 1.0m.
Further, breach is dashed forward and is fallen the passage communicated with air being respectively provided with more than 1 on the left and right abutment wall of chute.
Further, breach is dashed forward and is fallen the bottom surface of chute and tilted gradually downward to end by front end.
The beneficial effects of the utility model are: utilize jet impulse principle, and first current of growing fall the injection of chute front opening from breach is prominent, and breach is dashed forward and fallen the current not having outgoing choosing on flow structure base plate in chute both sides and continue flow forward along choosing flow structure base plate.Breach is prominent to fall at chute front opening after current injection, at one free face of intermediate formation for the current of both sides, therefore both sides current are during continuing flow forward, constantly penetrating along journey from the prominent abutment wall top, chute left and right of falling of breach, last remaining a small amount of current fall chute distal opening two side roof part flip shot from breach is prominent.Fall abutment wall top, chute left and right to choose angle along journey continue to increase owing to breach is prominent, then uniformly increase along journey sater professionals.Water flow through breach dash forward fall chute front opening jet, breach is dashed forward and is fallen abutment wall top, chute left and right and dash forward along journey jet, breach that the four strands of overflows falling chute distal opening two side roof part flip shot and formed spill out the most up and down, the heart that converges collides mutually, longitudinal extension diffusion, thus forms the longitudinal stretching lamellar overflow similar with Slit-type Bucket Jets structure.
The longitudinal diffusion degree of this utility model flip trajectory bucket structure increased water flow significantly, by aerial diffusion, collision, reduces the water yield that enters of unit are, thus reduces the trajectory nappe scouring capability to riverbed.Constantly chute front opening is fallen and breach is prominent falls abutment wall top, chute left and right along journey jet from breach is prominent due to current, in making to choose bank, current constantly reduce, in choosing bank, the depth of water reduces, the flowing pressure that abutment wall bears is little and height can reduce, therefore structure design is simple, and construction and investment cost are significantly better than slit-type energy dissipation.It addition, breach is dashed forward is respectively provided with the passage communicated with air of more than 1 in falling chute left and right abutment wall, can fully ventilate in groove, it is ensured that trough inner water tongue is stable, turbulent flow etc. will not be formed and cause cavitation erosion.Can be well adapted for current southwest head high, discharge per unit width is big, downstream river course is narrow, and geological conditions is poor, limited outlet structure escape works exit condition is arranged in outlet.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is plane graph of the present utility model；
Fig. 3 is the line A-A sectional view of Fig. 2；
Fig. 4 is the line B-B sectional view of Fig. 2；
Fig. 5 is the line C-C sectional view of Fig. 2；
Overflow figure when Fig. 6 is utility model works；
Fig. 7 is the top view of Fig. 6；
Parts, position and numbering in figure: choose flow structure abutment wall 1, choose flow structure base plate 2, and breach is prominent falls chute 3, and breach is prominent falls chute front opening 4, and breach is prominent falls chute distal opening 5, falls bank 6, and breach is prominent falls chute abutment wall 7, and breach is prominent falls chute base plate 8, passage 9.
Detailed description of the invention
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, 2, this utility model uses and chooses flow structure abutment wall 1, chooses flow structure base plate 2, and breach is prominent to fall chute 3 these three xoncrete structure boundary condition and realize the uniform diffusion effect of outlet stream longitudinal stretching.Utilize current jet impulse principle, first current of growing fall chute front opening 4 and penetrate from breach is prominent, the current not having outgoing that breach both sides are chosen on flow structure base plate 2 continue flow forward along choosing flow structure base plate 2, and constantly push up penetrate along journey from the prominent chute left and right abutment wall 7 that falls of breach, last remaining a small amount of current fall the 5 liang of side roof part flip shots of chute distal opening from breach is prominent.As shown in Figure 6 and Figure 7, there are obvious three regions in overflow form.Wherein Ith district is that the prominent 5 liang of side roof parts of chute distal opening that fall of breach are grown overflow on a small quantity, bigger owing to choosing angle, flip shot is the biggest, but owing to air being affected by resistance will not choose greatly angle penetrate along choosing flow structure end along parabola, but will be scattered time to a certain degree, collide on main overflow, a milky band is formed in overflow outer rim, if breach is prominent fall chute distal opening 5 width the biggest time, Hui Shi I district scope compared with big, the water yield is more, so that whole overflow enters front end, the pool water yield and relatively concentrates, scouring capability is stronger.IIth district is overall diffusion region, and after overflow goes out bank, the middle and lower part density of current is relatively big, overflow integral diffusion type water stock.With away from choosing the increase of bank outlet ends distance, diffusance and air entrainment are continuously increased.This region raises with head and prominent chute distal opening 5 width that falls of breach increases and increases.It is the main flow area of overflow, is also the overflow control zone that enters water scope and uniformity.IIIth district is that overflow leaves and chooses after bank fully diffusion region, large quantity of air from two lateral middle outgoing together and is brought into by prominent chute left and right abutment wall 7 overflow that falls of breach, thus aeration is abundant, the integral diffusion of current, and current become certain scattered thin stock after overflow leaves and chooses bank certain distance.
According to choosing the analysis of bank fluidised form, breach is prominent to fall chute distal opening 5 width and typically takes higher value and could meet hydraulics, for choosing the 0.8～0.95 of flow structure base plate 2 width.For making overflow longitudinally be sufficiently tensile, breach is dashed forward and is fallen chute 3 and flow to downstream need certain length, minimum length is not less than base plate 2 width choosing flow structure, and the prominent chute front opening 4 that falls of breach chooses angle and chooses angle less than structure end opening 5, the prominent chute front opening 4 that falls of breach chooses angle not less than-10 °, structure end opening 5 two ends are chosen angle and are not more than 45 °, and the difference of two angles is not less than 15 °, can be only achieved overflow in longitudinal stretching effect.When overflow has certain degree of drawing, breach is dashed forward and is fallen chute front opening 4 width and also should take suitable value, and for choosing the 0.1～0.7 of flow structure base plate 2 width, the water yield of guarantee overflow is more uniform along longitudinal distribution ratio.So dashed forward by adjusting and optimizing breach and fall the length of chute, choose angle, these parameters of A/F, the longitudinal stretching scope that can use stream of carrying water is bigger, also the water distribution that can use tongue of carrying water is more uniform, thus is greatly reduced into water discharge per unit width, reduces and washes away riverbed.
For ensureing that water flows through the prominent prominent chute left and right abutment wall 7 that falls of chute front opening 4, breach that falls of breach and pushes up and will not pound along journey injection jetting tongue that breach is prominent falls chute base plate 8, therefore breach dash forward fall chute 3 fall bank 6 require have certain altitude, at least not less than 1.0m, to form free nappe jet face.
Breach is dashed forward and is respectively provided with the passage communicated with air of more than 1 in falling chute left and right abutment wall 7, fully can ventilate in groove, it is ensured that trough inner water tongue is stable, will not form turbulent flow etc. and cause cavitation erosion.
Constantly chute front opening 4 is fallen and breach is prominent falls chute left and right abutment wall 7 and push up along journey jet from breach is prominent due to current, in making to choose bank, current constantly reduce, in choosing bank, the depth of water reduces, the flowing pressure that abutment wall bears is little and height can reduce, therefore structure design is simple, and construction and investment cost are significantly better than slit-type energy dissipation.Can be well adapted for current southwest head high, discharge per unit width is big, downstream river course is narrow, and geological conditions is poor, limited outlet structure escape works exit condition is arranged in outlet.Falling chute front opening 4 owing to breach is prominent near choosing flow structure minimum point, the original data errors choosing flow structure is relatively low, is therefore also applied for the flip trajectory bucket of low water head.Adjust this utility model can choose flow structure according to downstream river course situation is symmetrical formula, forward inclined cutout, reverse inclined cutout, to control direction and the drop point of main overflow, reduces and washes away riverbank, beneficially bank stability.
As a example by the simulation experiment of a certain power station:
This water levels of upstream and downstream drop is big, and maximum drop reaches 240m；Flood discharge flow is big, design/check operating mode flow 3229/3320m3/s；Flood discharge power is big, and flood discharge power reaches 7750MW, and energy is concentrated, but downstream river course is narrow, enters pool water surface width only 60～100m, and particularly thorny between huge energy and the narrow river course energy dissipating bearing capacity of lower sluicing stream, dissipation and scouring task is the most arduous.
Under the practical situation in this power station, these outlet structure escape works outlet flip trajectory bucket structure is compared with traditional slit structure:
Actual measurement slit abutment wall instantaneous maximum pressure 402.95kPa, chooses maximum water depth 24m in bank, and stream length is arranged and needed 113m downstream.These outlet structure escape works outlet flip trajectory bucket structure abutment wall maximum pressure 62.95kPa, chooses maximum water depth 5.6m in bank, and stream length is arranged and only needed 60m downstream.It is suitable that test records two kinds of structure downstream effect of energy dissipation.It is computed slit and chooses flow structure direct investment increase about 20,770,000 yuan than this utility model.
Claims (10)
1. outlet structure escape works outlet flip trajectory bucket structure, including by choose flow structure base plate and choose that flow structure abutment wall (1) constitutes choose flow structure, the described port of export choosing flow structure base plate (2) is upturned, choose flow structure abutment wall (1) and be arranged on the both sides choosing flow structure base plate (2), it is characterized in that: also include that breach in the form of slot is prominent and fall chute (3), described breach is prominent to fall chute (3) and is arranged on the port of export choosing flow structure base plate (2) the water outlet extending to choose flow structure.
2. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 1, it is characterised in that choosing flow structure described in: is symmetrical formula, forward inclined cutout or reverse inclined cutout.
3. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 1, it is characterised in that: breach is prominent falls chute (3) along the minimum length flowed to downstream not less than the width choosing flow structure base plate (2).
4. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 1, it is characterized in that: breach is prominent to fall chute (3) and be arranged on the middle part choosing flow structure base plate (2), and prominent chute (3) the front opening width that falls of breach is less than end A/F.
5. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 4, it is characterized in that: breach is prominent, and to fall chute (3) front opening width be choose flow structure base plate (2) width 0.1～0.7, breach is dashed forward, and to fall chute (3) distal opening width be choose flow structure base plate (2) width 0.8～0.95.
6. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 1, it is characterised in that: breach is prominent to fall chute (3) front opening position and chooses angle and choose angle less than distal portion.
7. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 6, it is characterised in that: breach is prominent to fall chute (3) front opening position and chooses angle not less than-10 °, and distal opening two ends are chosen angle and are not more than 45 °, and the difference of two angles is not less than 15 °.
8. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 1, it is characterised in that: prominent bank (6) height that falls falling chute (3) of breach is not less than 1.0m.
9. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 1, it is characterised in that: breach is prominent falls the passage communicated with air being respectively provided with more than 1 on the left and right abutment wall of chute (3).
10. outlet structure escape works outlet flip trajectory bucket structure as claimed in claim 1, it is characterised in that: the prominent bottom surface falling chute (3) of breach is tilted to end gradually downward by front end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620218352.9U CN205421200U (en) | 2016-03-21 | 2016-03-21 | A class dissipation structure is chosen in outlet structure escape works export |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498909B (en) * | 2016-10-08 | 2018-12-21 | 四川大学 | For spillway on bank or the defrlector bucket of flood discharge hole outlet |
| CN110629735A (en) * | 2019-10-22 | 2019-12-31 | 四川大学 | Narrow slit outlet flip bucket with opening at bottom of side wall |
-
2016
- 2016-03-21 CN CN201620218352.9U patent/CN205421200U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498909B (en) * | 2016-10-08 | 2018-12-21 | 四川大学 | For spillway on bank or the defrlector bucket of flood discharge hole outlet |
| CN110629735A (en) * | 2019-10-22 | 2019-12-31 | 四川大学 | Narrow slit outlet flip bucket with opening at bottom of side wall |
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