CN1084418C - Weir crest contracted jet technique and its combined energy dessipator - Google Patents
Weir crest contracted jet technique and its combined energy dessipator Download PDFInfo
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- CN1084418C CN1084418C CN 96100736 CN96100736A CN1084418C CN 1084418 C CN1084418 C CN 1084418C CN 96100736 CN96100736 CN 96100736 CN 96100736 A CN96100736 A CN 96100736A CN 1084418 C CN1084418 C CN 1084418C
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- weir crest
- gate pier
- dam
- constricted jet
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Abstract
The present invention provides a weir crest contracted jet technique and a combined energy dessipator thereof, which changes the binary thin layer flow state of the weir water flow of the traditional overflow dam into the ternary flow state of the longitudinal diffuser type. Moreover, an energy dissipator combined with various traditional dissipators is formed, which reaches the effect of increasing the energy dissipation, reduces the downstream erosion, enhances the operating degree of safety of the dissipator and economizes the investment cost. Thereby, a key problem in the construction of the water conservancy and hydropower project is solved.
Description
The present invention relates to weir crest constricted jet technology and combined energy dissipation device thereof.
In the Hydraulic and Hydro-Power Engineering of building high water head, big flow, need to solve this key issue of high-velocity flow energy dissipating erosion control.Main energy dissipating erosion control mode commonly used and method have underflow, bailing bucket stream or surface current, choose stream and dam facing energy dissipating etc.They all nationality help overfall dam current let out under the overflow weir crest by the lock hole, enter downstream river course through smooth overfull dam surface, its tail width of gate pier between each lock hole of traditional overflow dam crest is equal to or less than the gate pier width, promptly common horizontal tail type or fine stern type gate pier.This gate pier build makes the flood that flows through the lock hole enter various energy dissipaters with binary pellicular water ligulate attitude by overfull dam surface to carry out energy dissipating, thereby makes energy dissipater's effect of energy dissipation of some type poor, the energy dissipating requirement of incompatibility high water head, big discharge per unit width.
Essential idea of the present invention is to change that traditional overfall dam is crossed the binary pellicular water ligulate attitude of sluice stream and is the ternary constricted jet form of longitudinal diffusion formula, and formation and various traditional energy dissipaters' combined energy dissipation device, reach the enhancement effect of energy dissipation, reducing the downstream washes away, improve energy dissipater's security of operation degree, save investment.
Technical scheme of the present invention is to form " weir crest constricted jet ", promptly the width of gate pier (or abutment wall) afterbody is widened gradually, and the lock hole width is widened starting point constriction gradually from gate pier, and such gate pier is called flaring gate pier; After traditional flat (point) tail pier is changed to flaring gate pier, make the sluice stream of crossing that flows out the lock hole form the ternary constricted jet by original binary thin layer overflow along the overfull dam surface longitudinal diffusion, this technology is called " weir crest constricted jet ".Weir crest constricted jet and various traditional energy dissipater carry out combined energy dissipation as bailing bucket formula absorption basin or absorption basin, broken-line type dam facing etc., with finish its efficient energy dissipating, subtract dash, the objectives and tasks of safety and saving.
Below with reference to accompanying drawing invention is described in further detail:
Fig. 1 flaring gate pier pattern and technical data figure
Fig. 2 basic model flaring gate pier configuration picture
Fig. 3 YI type flaring gate pier configuration picture
Fig. 4 YII type flaring gate pier configuration picture
Dam facing does not have the pool sluicing aperture configuration picture is set behind Fig. 5 flaring gate pier
Fig. 6 weir crest constricted jet and bailing bucket formula absorption basin combined energy dissipation device
Fig. 7 weir crest constricted jet and absorption basin combined energy dissipation device
Fig. 8 weir crest constricted jet and broken-line type dam facing combined energy dissipation device
With reference to Fig. 1, the present invention makes the pier body by original width b from a certain position of gate pier
0Spread to b gradually to afterbody
0', thereby make the lock hole width by original B
0To the gate pier afterbody gradually constriction to B
0', this gate pier is called flaring gate pier 1.After the gate pier afterbody was widened, lock hole 2 dwindled to outlet gradually from widening starting point, thereby made current form the weir crest constricted jet at the lock hole exits, and its important technological parameters is as follows:
Lock hole shrinkage ratio ε, promptly original lock hole width B
0With contraction back brake hole width B
0' ratio in following scope
ε＝B
0′/B
0＝0.20～0.70
With reference to Fig. 2 basic model flaring gate pier 1, its pattern is that the concrete bodies that will widen the gate pier afterbody is arranged as straight line or curve wedge; With reference to Fig. 3, YI type flaring gate pier 1, its pattern is that the inclined-plane is cut at the top of widening the concrete wedge that the gate pier afterbody uses, but the pier body that shrinks the starting point place keeps certain altitude h; With reference to Fig. 4, YII type flaring gate pier 1, the inclined-plane is cut at its top of widening the concrete wedge that the gate pier afterbody uses, but shrinks the pier height degree h=0 of starting point.
With reference to Fig. 5, after the horizontal tail pier is widened into flaring gate pier 1, because the overfull dam surface of weir crest constricted jet behind the pier body forms large stretch of no pool 2, thereby, in the overfall dam dam body, arrange spilled water hole along the flaring gate pier axis direction, the outlet 3 of spilled water hole is arranged in the no pool, promptly constitutes the combined energy dissipation device of weir crest constricted jet and spilled water hole.
With reference to Fig. 6 and Fig. 7, the combined energy dissipation device of weir crest constricted jet and bailing bucket formula absorption basin, absorption basin.Its utilizes the method widen gate pier to change the horizontal tail or the fine stern shape gate pier of traditional overfall dam into flaring gate pier 1, thereby the laminar overflow that was the binary fluidised form is originally become the weir crest constricted jet of ternary fluidised form, and it and traditional bailing bucket formula absorption basin 2 united utilization, the tail bank 3 of this device is arranged to bucket type (with reference to Fig. 6), promptly constitutes weir crest constricted jet and bailing bucket formula absorption basin combined energy dissipation device.The tail bank 3 of this device power bank type (with reference to Fig. 7) that is arranged to disappear promptly constitutes weir crest constricted jet and absorption basin combined energy dissipation device.This combined energy dissipation apparatus features is changed into the ternary hydraulic jump to original pool inner water stream after being that the weir crest constricted jet enters bailing bucket formula absorption basin or absorption basin water cushion.Facts have proved that this combined energy dissipation device can improve the energy dissipation rate of bailing bucket formula absorption basin and absorption basin greatly, with the flow velocity that goes out the pond, the alluvial behind the minimizing Chi Weikan weakens the downstream wave in reduction bailing bucket formula absorption basin or the absorption basin pond.
With reference to Fig. 8, weir crest constricted jet and broken-line type dam facing combined energy dissipation device.It utilizes flaring gate pier 1 to make the weir crest overflow vertically expand to the constricted jet that is the ternary fluidised form along dam facing, if dam facing is smooth broken-line type overfull dam surface 2, then constitutes the combined energy dissipation device of weir crest constricted jet and broken line type dam facing.This device has the effect of flaring pier energy dissipation and the energy dissipating of broken-line type overfull dam surface concurrently, thereby have: 1, promote energy dissipating, promptly except the flow resistance energy dissipating effect of former broken-line type overfull dam surface, also have each step in adjacent each lock hole and overflow to cross mutually and the effect of self energy dissipating along laterally (dam is axial); 2, the surface of the overfall dam behind the flaring gate pier forms large stretch of no pool 3, can ventilate between broken-line type overfull dam surface and overflow, exempts the cavitation erosion of broken-line type overfull dam surface.
Claims (5)
1. one kind forms the method for weir crest constricted jet at the overflow dam crest, it is characterized in that: (1), will be positioned at the gate pier build at overfall dam top, being changed by traditional horizontal tail pier or fine stern type gate pier becomes flaring gate pier, and promptly from a certain position of gate pier, the pier body is by width b
0Spread to b gradually to afterbody
0', lock hole width B
0Narrow to B gradually to afterbody
0', lock hole shrinkage ratio is between 0.2～0.7; (2), by being widened with lock hole constriction, a plurality of gate pier afterbodys that are positioned at dam crest become flaring gate pier type overfall dam, this overfall dam makes the current by each lock hole, at flaring gate pier afterbody lock hole constriction termination, in weir crest form the ternary fluidised form, along vertical constricted jet that let out under the overfull dam surface, vertical expansion, i.e. weir crest constricted jet.
2. form the weir crest constricted jet in accordance with the method for claim 1, it is characterized in that: utilize the overfull dam surface of weir crest constricted jet to form large stretch of no pool at the flaring gate pier rear portion, and in the overflow dam body along the axis arranged spilled water hole of flaring gate pier, the outlet of this spilled water hole is positioned at no pool, promptly constitutes the combined energy dissipation device of weir crest constricted jet and spilled water hole.
3. form the weir crest constricted jet in accordance with the method for claim 1, it is characterized in that: utilize weir crest constricted jet and traditional bailing bucket formula absorption basin formation combined energy dissipation device.
4. form the weir crest constricted jet in accordance with the method for claim 1, it is characterized in that: utilize weir crest constricted jet and traditional absorption basin formation combined energy dissipation device.
5. form the weir crest constricted jet in accordance with the method for claim 1, it is characterized in that: utilize weir crest constricted jet and broken-line type dam facing to constitute the combined energy dissipation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96100736 CN1084418C (en) | 1996-01-30 | 1996-01-30 | Weir crest contracted jet technique and its combined energy dessipator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96100736 CN1084418C (en) | 1996-01-30 | 1996-01-30 | Weir crest contracted jet technique and its combined energy dessipator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1136621A CN1136621A (en) | 1996-11-27 |
| CN1084418C true CN1084418C (en) | 2002-05-08 |
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ID=5116706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96100736 Expired - Fee Related CN1084418C (en) | 1996-01-30 | 1996-01-30 | Weir crest contracted jet technique and its combined energy dessipator |
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| Country | Link |
|---|---|
| CN (1) | CN1084418C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102852122B (en) * | 2012-10-15 | 2013-09-04 | 戴会超 | Eco-friendly subsidiary dam capable of improving gas supersaturation |
| CN102900054A (en) * | 2012-10-25 | 2013-01-30 | 中国水电顾问集团北京勘测设计研究院 | River bank-like flood spillway |
| CN104404926B (en) * | 2014-10-08 | 2016-07-27 | 四川大学 | Dam facing chooses the overfall dam of bank shunting energy dissipating |
| CN104452691B (en) * | 2014-12-29 | 2016-03-02 | 中国电建集团中南勘测设计研究院有限公司 | A kind of shallow top layer submersible submerged jets energy-dissipating structure |
| CN105133555B (en) * | 2015-09-28 | 2017-01-11 | 安徽理工大学 | Step type and spiral reverse rotation bottom sill type combined energy dissipation facility and energy dissipation method |
| CN106894399B (en) * | 2017-04-19 | 2022-05-13 | 中国水利水电科学研究院 | Structure and method for adjusting flood discharge water flow distribution |
| CN107190711B (en) * | 2017-04-28 | 2019-04-12 | 昆明理工大学 | A kind of combined energy dissipater of suitable high moisture head and small flow flood-discharge energy-dissipating |
-
1996
- 1996-01-30 CN CN 96100736 patent/CN1084418C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1136621A (en) | 1996-11-27 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: HYDRAULICS RESEARCH INSTITUTE, CHINA WATER CONSER Free format text: FORMER OWNER: POWER INDUSTRY SECTION, HYDRAULICS INSTITUTE, CHINA WATER CONSERVANCY AND HYDROPOWER INSTITUTE OF SCIENCE AND TECHNOLOGY; BEIJING SURVEY AND DESIGN INSTITUTE OF THE MINISTRY OF WATER RESOURCES; GUANGX ... Effective date: 20011220 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20011220 Applicant after: Hydraulics Inst., China Water Conservancy and Hydropower Science Inst. Applicant after: State Power Corporation Beijing survey design and Research Institute Applicant before: Hydraulic Research Institute of China Institute of water resources and Hydropower Research Applicant before: Beijing survey design and Research Institute of Ministry of water resources Applicant before: Guangxi Yantan Hydropower Station Construction Company |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020508 Termination date: 20140130 |