CN104563067A - Method for eliminating deviation of water jet of water tongue shock wave of slot sill and auto-correcting deviation slot sill - Google Patents
Method for eliminating deviation of water jet of water tongue shock wave of slot sill and auto-correcting deviation slot sill Download PDFInfo
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- CN104563067A CN104563067A CN201410790897.2A CN201410790897A CN104563067A CN 104563067 A CN104563067 A CN 104563067A CN 201410790897 A CN201410790897 A CN 201410790897A CN 104563067 A CN104563067 A CN 104563067A
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- Prior art keywords
- bank
- narrow slit
- rectangular pyramid
- abutment wall
- overflow
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
Abstract
The invention relates to a method for eliminating deviation of a water jet of a water tongue shock wave of a slot sill and an auto-correcting deviation slot sill. The method comprises the following steps of arranging a rectangular pyramid body on one side wall with a stronger water tongue shock wave, wherein each two adjacent side surfaces of the pyramid body by adopting one ridge as a common side are respectively located in two intersected wall surfaces of the corresponding side wall; generating a diagonal moving water jet when a water tongue flows through the rectangular pyramid body, wherein the diagonal moving water jet is counteracted to a reflexion and scour flow. The slot sill comprises a slot sill bottom, wherein the side walls are respectively arranged on two sides of the slot sill bottom; each side wall comprises the two intersected wall surfaces; the rectangular pyramid body is arranged on one side wall bearing the stronger water tongue shock wave in a slot sill base body; each two adjacent side surfaces of the pyramid body by adopting one ridge as a common side are respectively located in the two intersected wall surfaces of the corresponding side wall.
Description
Technical field
The present invention relates to a kind of commutation technique measure of outlet structure escape works flip trajectory bucket, belong to Hydraulic and Hydro-Power Engineering flood-discharge energy-dissipating technical field, be specifically related to a kind of method and the self correction narrow slit bank of eliminating narrow slit bank overflow shock wave water stock deflection.
Background technology
The water conservancy and hydropower resource of China's abundant focuses mostly in southwest, and high water head, large discharge, couloirs are the main features of Southwestern China area hydroelectric project, adopts energy-dissipating tech conventional to be in the past difficult to solve the problem of downstream erosion control.On flood-discharge energy-dissipating way choice, flip trajectory bucket is because its build is simple, effect of energy dissipation is good and comparatively economic feature is often used.Narrow energy dissipation is the one of trajectory bucket type energy, due to narrow slit bank by abutment wall shrink be formed in longitudinally and vertical on the overflow that fully pulls open, be dispersed into sheet water body after the abundant fragmentation of overflow, turbulent fluctuation aeration is violent, thus improve effect of energy dissipation, significantly reduce washing away riverbed.In addition, it is less that narrow slit bank overflow takies river width, is specially adapted to the hydroelectric project of Narrow Valleys.
The deflection of narrow slit bank contraction section abutment wall causes rapid flow shock wave, and under shock wave, both sides abutment wall contraction section starting point respectively has one higher than the water stock obliquely flow of the center line water surface.When narrow slit bank both sides shock strength is identical, two strands of current no longer diagonal after center line converges, but start to flow to downstream straightly.When incoming flow irregularity before narrow slit bank, there is reflexion and scour flow, narrow slit bank both sides shock strength is just different.At this moment, after the shock wave water stock of both sides crosses, although low water stock becomes straight flowing from obliquely flow, the part exceeded in high water stock still keeps obliquely flow after crossing low water stock.When strong shock wave water stock deflection bank slope, with regard to easily causing overflow to impact bank slope problem, threatening bank stability, thus increasing the difficulty of narrow river valley Design of Discharge Dissipation.
Summary of the invention
The present invention proposes a kind of method and the self correction narrow slit bank that can correct the elimination narrow slit bank overflow shock wave water stock deflection of narrow slit bank overflow top impact ripple water stock deflection.
The present invention adopts following technical scheme:
A kind of method eliminating narrow slit bank overflow shock wave water stock deflection of the present invention, described narrow slit bank comprises at the bottom of narrow slit bank bank, and the both sides at the bottom of narrow slit bank bank are respectively equipped with abutment wall, and described abutment wall comprises two metopes intersected, and comprises the following steps:
Step 1 is selected to be subject to the stronger side abutment wall of overflow shock wave, described side abutment wall is provided with rectangular pyramid, and, the end of described rectangular pyramid, overlaps with at the bottom of narrow slit bank bank, the two metope intersections that a rib and the abutment wall of narrow slit bank of rectangular pyramid shrink section start overlap and the summit of rectangular pyramid is positioned at limit coping, and adjacent two the rectangular pyramid side surfaces being common edge with a described rib lay respectively in the crossing metope of two of abutment wall.
When step 2 overflow flows through described rectangular pyramid, produce diagonal water stock, described diagonal water stock and reflexion and scour flow offset, and weaken the strong shock wave of overflow, eliminate the deflection of shock wave water stock to bank.
A kind of self correction narrow slit bank of the present invention, described narrow slit bank comprises at the bottom of narrow slit bank bank, both sides at the bottom of narrow slit bank bank are respectively equipped with abutment wall, described abutment wall comprises two metopes intersected, bearing on the stronger side abutment wall of overflow shock wave in narrow slit camphyl body is provided with rectangular pyramid, and, the end of described rectangular pyramid, overlaps with at the bottom of narrow slit bank bank, the two metope intersections that a rib and the abutment wall of narrow slit bank of rectangular pyramid shrink section start overlap and the summit of rectangular pyramid is positioned at limit coping, laying respectively in the crossing metope of two of abutment wall with a described rib adjacent two the rectangular pyramid side surfaces that are common edge of rectangular pyramid.
Compared with prior art, tool of the present invention has the following advantages:
Along with the increase of the incoming flow depth of water, the interference of rectangular pyramid to current reduces gradually.When the incoming flow depth of water and flow large time, the inlet flow conditions wide variations that rectangular pyramid can adapt to, if although diagonal water stock can be produced when adopting similar four prisms cylinder to cut down overflow deflection, but may choose because excessively hindering flowing to cause current normally to rise, cause current to block, narrow slit bank was lost efficacy.Therefore, the inlet flow conditions wide scope that rectangular pyramid can be suitable for, not only solves the problem of overflow deflection, simultaneously little to flowing interference.
By optimizing the geometric parameter of rectangular pyramid, the unfavorable fluidised form of the shock wave water stock deflection at narrow slit bank overflow top can be eliminated under different inlet flow conditions, solving overflow and impacting bank slope problem.
The rectangular pyramid that the present invention is arranged in narrow slit bank strong shock wave side wall corner is according to incoming flow situation from narrow slit bank internal adjustment current, and motivated, structure is simple, can keep overflow main flow still and be straight direction, be conducive to the layout of energy dissipater.In addition, the present invention utilizes the cross sectional dimensions of rectangular pyramid along the reduction gradually of short transverse, adapts to inlet flow conditions wide scope, little to flowing interference.
Accompanying drawing explanation
Fig. 1 is narrow slit bank schematic perspective view.
Fig. 2 is narrow slit bank overflow deflection schematic diagram.
Fig. 3 is rectangular pyramid and installation site schematic diagram thereof.
Fig. 4 is that rectangular pyramid eliminates overflow deflection schematic diagram.
Fig. 5 is narrow slit bank and rectangular pyramid plan view.
Fig. 6 is narrow slit bank and rectangular pyramid I-I sectional drawing.
Fig. 7 is embodiment 1 narrow slit bank build figure.
Fig. 8 is the overflow photo of embodiment 1 when check flood operating mode.
Fig. 9 is the overflow photo of embodiment 1 when design flood operating mode.
Figure 10 is the overflow photo of embodiment 1 when 5% flood operating mode.
Figure 11 is embodiment 2 narrow slit bank and rectangular pyramid plan view.
Figure 12 is embodiment 2 narrow slit bank and rectangular pyramid II-II sectional drawing.
Figure 13 is the overflow photo of embodiment 2 when check flood operating mode.
Figure 14 is the overflow photo of embodiment 2 when design flood operating mode.
Figure 15 is the overflow photo of embodiment 2 when 5% frequent flood operating mode.
Figure 16 is embodiment 3 narrow slit bank and rectangular pyramid plan view.
Figure 17 is embodiment 3 narrow slit bank and rectangular pyramid III-III sectional drawing.
Figure 18 is the overflow photo of embodiment 3 when check flood operating mode.
Figure 19 is the overflow photo of embodiment 3 when design flood operating mode.
Figure 20 is the overflow photo of embodiment 3 when 5% frequent flood operating mode.
Detailed description of the invention
A kind of method eliminating narrow slit bank overflow shock wave water stock deflection of the present invention, described narrow slit bank 1 to comprise at the bottom of narrow slit bank bank 11, and at the bottom of narrow slit bank bank, the both sides of 11 are respectively equipped with abutment wall 12, and described abutment wall 12 comprises two metopes intersected, and comprises the following steps:
Step 1 is selected to be subject to the stronger side abutment wall of overflow shock wave, described side abutment wall is provided with rectangular pyramid 2, and, the end of described rectangular pyramid 2, overlaps with at the bottom of narrow slit bank bank, the two metope intersections that a rib and the abutment wall 12 of narrow slit bank of rectangular pyramid 2 shrink section start overlap and the summit of rectangular pyramid 2 is positioned at the top of abutment wall 12, adjacent two the rectangular pyramid side surfaces being common edge with a described rib lay respectively in the crossing metope of two of abutment wall 12
When step 2 overflow flows through described rectangular pyramid 2, produce diagonal water stock, described diagonal water stock 3 offsets 4 with reflexion and scour flow, weakens the strong shock wave of overflow, eliminates the deflection of shock wave water stock to bank.
A kind of self correction narrow slit bank of the present invention, described narrow slit bank 1 to comprise at the bottom of narrow slit bank bank 11, at the bottom of narrow slit bank bank, the both sides of 11 are respectively equipped with abutment wall 12, described abutment wall 12 comprises two metopes intersected, bearing on the stronger side abutment wall of overflow shock wave in narrow slit camphyl body 1 is provided with rectangular pyramid 2, and, the end of described rectangular pyramid 2, overlaps with at the bottom of narrow slit bank bank, the two metope intersections that a rib and the abutment wall 12 of narrow slit bank of rectangular pyramid 2 shrink section start overlap and the summit of rectangular pyramid 2 is positioned at the top of abutment wall 12, laying respectively in the crossing metope of two of abutment wall 12 with a described rib adjacent two the rectangular pyramid side surfaces that are common edge of rectangular pyramid 2.
Fig. 1 is narrow slit bank schematic perspective view.When incoming flow forms reflexion and scour flow, the shock strength that both sides abutment wall causes differs greatly, and overflow top strong shock wave water plume is straight to no longer doing, but obliquely flow, if flow to bank slope, overflow may be pounded and hit bank slope, as shown in Figure 2, θ is the deflection angle of overflow in its flowing.Overflow correction facility of the present invention is a rectangular pyramid, be arranged on shock wave stronger side abutment wall and shrink Initial Turning Angle place, rectangular pyramid SABCD as shown in Figure 2, the intersection making the crest line SB of rectangular pyramid and abutment wall shrink section start two metope overlaps, the SAB side surface of rectangular pyramid before deflation let out on groove side wall, SBC side surface after shrinking let out on groove side wall, rectangular pyramid bottom surface ABCD is on channel base plate.The side surface SAD of rectangular pyramid is the flow surface that meets water, and SDC is backwater flow surface.When current flow through this rectangular pyramid, the diagonal water stock produced under its influence and reflexion and scour flow offset, thus weaken strong shock wave, have reduced or remitted shock wave water stock to bank deflection, as shown in Figure 3.The Another reason of employing rectangular pyramid is: the upstream face SAD of rectangular pyramid SABCD is the triangle that a base is positioned on narrow slit bank base plate, and as shown in Figure 5,6, the main structure parameters of rectangular pyramid comprises:
(1) rectangular pyramid size 1:a;
(2) rectangular pyramid size 2:c;
(3) rectangular pyramid size 3:d;
(4) rectangular pyramid height: h;
Principle of the present invention is: narrow slit bank overflow top impact ripple water stock generation deflection is because incoming flow border is left-right asymmetry, is formed and to make after reflexion and scour flow caused by left and right side wall shock strength differs greatly.The diagonal current that the rectangular pyramid arranged in strong shock wave side wall corner in the present invention produces and reflexion and scour flow offset, and balance the shock strength of left and right side wall, thus correct for the problem of overflow deflection.
Below in conjunction with 3 engineering constructions example, explanation is specifically made to the present invention.
Certain hydroelectric project outlet structure escape works is made up of 3 overflow surface bay and downstream dissipator of energy erosion control building etc.The table every hole clear span 13m in hole, elevation of weir crest 399.50m.Weir head upstream stretches out 2.50m, face, weir adopts WES curve, weir crest upstream is three-arc, weir crest (0+003.14m is indulged on dam) following weir surface curve equation is Y=0.039183x1.85, be that 1:1.211 slope section connects with downstream dam slope, the dam that goes directly, inclined-plane is indulged the circular arc that 0+027.87m (elevation 385.685m) and radius are 30m and is connected.Circular arc bottom elevation is 463.12m, and under circular arc, trip is horizontal segment.Lead wall outlet section and adopt " Y " type Slit-type Bucket Jets energy dissipation mode.
The each characteristic level of water of engineering is, design flood level: 421.12m; Check flood level: 426.55m, 5% frequent flood position: 420.00m (gatage: 13.12m).
Adopt above-mentioned engineering 1:80 guide physical model, verify validity of the present invention.The embodiment of the present invention 1 size is as follows: B=13.0m, b=6.4m, L=15.0m, h=32.0m, and embodiment 1 is traditional narrow slit bank, does not have to adopt the overflow satisfactory after correcting that the present invention relates to, to carry out with adopting the embodiment of this measure the use contrasted; The narrow slit bank build of embodiment 2 with embodiment 1, rectangular pyramid physical dimension a=1.6m, c=1.2m, d=4.8m, h=32.0m; The narrow slit bank build of embodiment 3 with embodiment 1, rectangular pyramid physical dimension a=3.2m, c=2.0m, d=8.0m, h=32.0m.
Fig. 7 is embodiment 1 narrow slit bank build figure, left hole in Fig. 8-Figure 10 is embodiment 1 narrow slit bank overflow fluidised form photograph, can find out, overflow top has water stock to rush at left bank, trace it to its cause is because left hole incoming flow border is asymmetric, table produces reflexion and scour flow in hole, and on the right side of narrow slit bank, shock wave is significantly better than caused by left side.Under check flood and 5% frequent flood operating mode, this overflow top impact ripple water stock directly impacts slope, left bank, threatens the stable of downstream bank slope.
Embodiment 2 has set up rectangular pyramid in narrow slit bank RightWall corner, and narrow slit bank and rectangular pyramid shape parameter are shown in Figure 11 and Figure 12.Figure 13-15 is embodiment 2 overflow photos under different operating mode, and as can be seen from overflow form in figure, after contraction section RightWall arranges tetrahedron, right side shock wave obviously weakens.Compared with embodiment 1, overflow top impact ripple water stock left deflection reduces to some extent, and under check flood and design flood operating mode, shock wave water stock no longer impacts left bank, but when 5% frequent flood operating mode, still there is the bad fluidised form that overflow impacts left bank.
Embodiment 3 increases the physical dimension of rectangular pyramid, and narrow slit bank and the rectangular pyramid shape parameter of embodiment 3 are shown in Figure 16 and Figure 17.Figure 18-20 is embodiment 3 overflow photos under different operating mode, and as can be seen from overflow form in figure, after increase rectangular pyramid dimensional parameters, right side shock wave weakens further.Under check flood, design flood and 5% frequent flood operating mode, straightly after left and right sides shock wave water stock crosses flow to downstream, deflection does not occur, solve overflow and impact left bank problem.
Table 1 lists the overflow deflection angle of 3 embodiment narrow slit bank overflows under different flood operating mode, as can be seen from Table 1, does not take the narrow slit bank overflow of any measure of rectifying a deviation overflow deflection angle under each operating mode comparatively large, maximumly reaches 28.1 °.After embodiment 2,3 adopts the rectangular pyramid that the present invention relates to, overflow deflection is controlled, and avoids overflow and pounds and hit bank slope.This embodiment proves, the present invention arranges rectangular pyramid by shrinking side wall corner at narrow slit bank, and water (flow) direction in adjustment narrow slit bank, reduces right side strong shock wave, avoids the generation that overflow impacts bank slope.
Table 1 embodiment narrow slit bank overflow deflection angle theta (°)
| Operating mode | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Check flood | 15.4 | 12.7 | 7.1 |
| Design flood | 11.3 | 5.1 | 0 |
| 5% frequent flood | 28.1 | 18.4 | 4.8 |
Claims (2)
1. eliminate the method for narrow slit bank overflow shock wave water stock deflection for one kind, described narrow slit bank (1) comprises at the bottom of narrow slit bank bank (11), at the bottom of narrow slit bank bank, the both sides of (11) are respectively equipped with abutment wall (12), described abutment wall (12) comprises two metopes intersected, it is characterized in that, comprise the following steps:
Step 1 is selected to be subject to the stronger side abutment wall of overflow shock wave, described side abutment wall is provided with rectangular pyramid (2), and, the end of described rectangular pyramid (2), overlaps with at the bottom of narrow slit bank bank, the two metope intersections that a rib of rectangular pyramid (2) and the abutment wall (12) of narrow slit bank shrink section start overlap and the summit of rectangular pyramid (2) is positioned at the top of abutment wall (12), and adjacent two the rectangular pyramid side surfaces being common edge with a described rib lay respectively in the crossing metope of two of abutment wall (12).
When step 2 overflow flows through described rectangular pyramid (2), produce diagonal water stock, described diagonal water stock (3) and reflexion and scour flow offset (4), weaken the strong shock wave of overflow, eliminate the deflection of shock wave water stock to bank.
2. a self correction narrow slit bank, described narrow slit bank (1) comprises at the bottom of narrow slit bank bank (11), at the bottom of narrow slit bank bank, the both sides of (11) are respectively equipped with abutment wall (12), described abutment wall (12) comprises two metopes intersected, it is characterized in that, bearing on the stronger side abutment wall of overflow shock wave in narrow slit camphyl body (1) is provided with rectangular pyramid (2), and, the end of described rectangular pyramid (2), overlaps with at the bottom of narrow slit bank bank, the two metope intersections that a rib of rectangular pyramid (2) and the abutment wall (12) of narrow slit bank shrink section start overlap and the summit of rectangular pyramid (2) is positioned at the top of abutment wall (12), laying respectively in the crossing metope of two of abutment wall (12) with a described rib adjacent two the rectangular pyramid side surfaces that are common edge of rectangular pyramid (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410790897.2A CN104563067A (en) | 2014-12-17 | 2014-12-17 | Method for eliminating deviation of water jet of water tongue shock wave of slot sill and auto-correcting deviation slot sill |
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| CN201410790897.2A CN104563067A (en) | 2014-12-17 | 2014-12-17 | Method for eliminating deviation of water jet of water tongue shock wave of slot sill and auto-correcting deviation slot sill |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356119A (en) * | 2018-11-23 | 2019-02-19 | 中国电建集团成都勘测设计研究院有限公司 | Let out slot aerator structure |
| CN110108453A (en) * | 2019-04-04 | 2019-08-09 | 天津大学 | A kind of test method of the vertical splash fog precipitation distribution in abnormal shape atomization source |
| CN110629735A (en) * | 2019-10-22 | 2019-12-31 | 四川大学 | Narrow slit outlet flip bucket with opening at bottom of side wall |
| CN110991021A (en) * | 2019-11-25 | 2020-04-10 | 水利部交通运输部国家能源局南京水利科学研究院 | Variable density three-dimensional simulation method for high dam drainage flow-picking nappe |
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| JP5092832B2 (en) * | 2008-03-24 | 2012-12-05 | 独立行政法人農業・食品産業技術総合研究機構 | Falling water sound and falling water flow attenuation structure in water |
| CN103498452A (en) * | 2013-10-17 | 2014-01-08 | 中国水电顾问集团北京勘测设计研究院有限公司 | Narrow seam flip bucket structure of high-gradient narrow river valley release structure |
| CN203514275U (en) * | 2013-10-17 | 2014-04-02 | 中国水电顾问集团北京勘测设计研究院有限公司 | Narrow-slit flip bucket structure of release structure in high and steep narrow valley |
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| JPS5639225A (en) * | 1979-09-08 | 1981-04-14 | Marushima Suimon Seisakusho:Kk | Energy dissipator |
| JP5092832B2 (en) * | 2008-03-24 | 2012-12-05 | 独立行政法人農業・食品産業技術総合研究機構 | Falling water sound and falling water flow attenuation structure in water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356119A (en) * | 2018-11-23 | 2019-02-19 | 中国电建集团成都勘测设计研究院有限公司 | Let out slot aerator structure |
| CN110108453A (en) * | 2019-04-04 | 2019-08-09 | 天津大学 | A kind of test method of the vertical splash fog precipitation distribution in abnormal shape atomization source |
| CN110108453B (en) * | 2019-04-04 | 2024-03-19 | 天津大学 | Test method for vertical splashing fog rain distribution of special-shaped atomization source |
| CN110629735A (en) * | 2019-10-22 | 2019-12-31 | 四川大学 | Narrow slit outlet flip bucket with opening at bottom of side wall |
| CN110991021A (en) * | 2019-11-25 | 2020-04-10 | 水利部交通运输部国家能源局南京水利科学研究院 | Variable density three-dimensional simulation method for high dam drainage flow-picking nappe |
| CN110991021B (en) * | 2019-11-25 | 2023-09-29 | 水利部交通运输部国家能源局南京水利科学研究院 | Variable density three-dimensional simulation method for high dam drainage diversion water tongue |
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Application publication date: 20150429 |