CN101538840A - Trajectory bucket type energy dissipater in absorption basin - Google Patents
Trajectory bucket type energy dissipater in absorption basin Download PDFInfo
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- CN101538840A CN101538840A CN200910058658A CN200910058658A CN101538840A CN 101538840 A CN101538840 A CN 101538840A CN 200910058658 A CN200910058658 A CN 200910058658A CN 200910058658 A CN200910058658 A CN 200910058658A CN 101538840 A CN101538840 A CN 101538840A
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Abstract
The invention relates to a trajectory bucket type energy dissipater in an absorption basin, belonging to the field of engineering hydraulics. The trajectory bucket type energy dissipater is a triangular flip bucket arranged in the absorption basin, and the triangular flip bucket divides the absorption basin into a front basin and a rear basin; and the flip position of the triangular flip bucket can be changed in the range of one fourth to two thirds of the length of the absorption basin. The upstream face bucket angle of the triangular flip bucket is changed in the range from 5 to 45 degrees; the downstream bucket angle is changed in the range from 45 to 90 degrees; the length of the bottom edge of the triangular flip bucket is one sixth to one third of the total length of the absorption basin; the width of the triangular flip bucket is equal to the length of the absorption basin; and the height of the triangular flip bucket is one eighth to one fourth of the bottom edge of the triangular flip bucket. The trajectory jet energy dissipater of the invention not only shortens the length of the absorption basin and contributes to the saving of construction cost, but also increases the efficiency of energy dissipation, can be used in any normal absorption basin or be matched with other assistant energy dissipaters in the normal absorption basin, and the effects are excellent.
Description
Technical field
The present invention relates to the trajectory bucket type energy in a kind of absorption basin, the trajectory bucket type energy of the triangular flip bank in particularly a kind of absorption basin belongs to field of engineering hydraulics.
Background technology
In the hydraulic engineering, because its leaving energy is bigger, need absorption basin be set in its exit with dissipation complementary energy at outlet structure escape works such as some weir flood discharging tunnels, flood spillway and gate dams.So-called " energy dissipating " is not for energy " is disappeared " on the hydraulics, and is meant the conversion of energy.Conventional absorption basin mainly is to utilize the generation hydraulic jump to carry out disspation through hydraudic jimp in the pond in, just disspation through hydraudic jimp is to utilize absorption basin to make down sluicing stream produce hydraulic jump in outlet structure escape works outlet limited range, hydraulic jump is connected the upstream and downstream current, and makes mechanical energy be converted to heat energy to reach the purpose of energy dissipating by the violent turbulent fluctuation whirlpool effect of rolling of hydraulic jump upstream and downstream current generation surface.The underflow energy dissipation by hydraulic jump is with a long history, it can adapt under high, medium and low head at different levels and the different geological conditions, be connected with the downstream current with the hydraulic jump pattern, its flow-shape is stable, effect of energy dissipation is also better, therefore the disspation through hydraudic jimp worker has obtained using widely [Katakam V.and Rama P. in hydraulic engineering, Spatial B-Jump at sudden channelenlargements with abrupt drop, J.of Hydraulic Engineering, ASCE, Vol.124, No.6, June, 1998.].But also there is weak point in it, as the situation of conventional absorption basin at the absorption basin curtailment, often can not form hydraulic jump because the downstream water depth that is complementary with conjugate depth can not be provided; In addition, excessive absorption basin its face underflow speed and often the absorption basin base plate damaged again.
At top described problem, on the outlet structure escape works of high water head, big flow, adopt the novel energy dissipater of table hole-bottom outlet-absorption basin associating to arrange, as present domestic Ankang, the last five small stream, the Qingjian River every high dam hinge hydraulic architectures such as river rocks; Low Fo Shi counts hydraulic jump for big discharge per unit width, can adopt one or more levels absorption basin to carry out disspation through hydraudic jimp according to the engineering actual conditions; Entad current to the arch dam absorption basin have also found some special measures, add asymmetric flaring gate pier or add the T-shape pier in absorption basin as employing table hole, current are returned to evenly go out stream.For improving energy dissipation rate, guarantee the generation of hydraulic jump effectively, thereby auxiliary energy dissipater various in the absorption basin appearred in the middle of engineering is used, as the power bank that disappears, dig dark formula absorption basin, toe earnestly reaches [Rajaratnam N such as T type pier, The forced hydraulic jump, Part1 and Part 2, Water Power, Vol.16, No.1 and No.2, Jan.and Feb., 1964. Ni Han roots. the simplification computational methods of flaring gate pier-absorption basin, the water conservancy journal, the 6th phase, in June, 1998, Jiang Feng etc. low Fo Shi counts design of T type pier absorption basin and energy dissipating research, water conservancy journal, supplementary issue, in January, 1998 ,].Although these auxiliary energy dissipaters' use proves effective in most engineerings, but also there is defective simultaneously, on the one hand, obviously [Ai Keming is also seen in the side effects such as cavitation erosion that the auxiliary energy dissipater who arranges in the absorption basin brings for self and absorption basin, the erosion damage of disspation through hydraudic jimp and control, outlet work and high-velocity flow, 1995 (3).], on the other hand, the auxiliary energy dissipater of layout do not solve absorption basin face the big root problem of underflow speed [Wang Caihuan, Xiao Xingbin. the disspation through hydraudic jimp design studies with use present situation commentary [J]. Sichuan hydroelectric generation, the 1st the 1st phase of volume, in March, 2000].
Flip trajectory bucket is the modal a kind of energy dissipating modes of outlet structure escape works, this energy dissipating mode is exactly to choose the stream bank what the outlet structure escape works downstream was built a fixed angle of altitude, utilize the huge kinetic energy of the stream that sluices down, current are chosen into aerial, be connected mutually with the downstream current with the downstream that drops to away from building then.Be characterized in: can be by means of the aerial diffused air aeration energy dissipating of free jet; Can utilize overflow to go into the shear action that the turbulent fluctuation diffusion of submerged jets behind the water cushion of downstream and water thigh and both sides whirlpool roll again and come energy dissipating.The advantage of flip trajectory bucket is to save downstream apron, and simple structure is convenient to maintenance.
Xu Guangxiang etc. have proposed vertical classification, horizontal differential compound absorption basin [Xu Guangxiang, Cui Yuda, Yang Zhongchao. the application study [J] of compound absorption basin in the small power station of mountain area. the hydroelectric generation journal, the 26th the 2nd phase of volume, in April, 2007: 87-92], main pond, left side vertically is divided into two-stage, and the two differential formula absorption basin of elevation at the bottom of the pond is suitably raised in auxilliary pond, right side, reaches effect of energy dissipation preferably in the energy dissipater's model investigation of power station, Yu Jiang mottled bamboo garden, Chongqing.But the retaining bank of this build is a conventional retaining bank, and it is less with respect to whole absorption basin size, only plays the effect that absorption basin is divided into two-stage, does not play the effect of choosing stream.Guo Weicheng at Puning crow stone regulating dam engineering proposed multistage absorption basin notion [Guo Weicheng. the application of multistage absorption basin. western mineral exploration engineering. total the 98th phase 2004 (7): 11-12], but each grade absorption basin all is a complete absorption basin, belongs to tandem type.And this tandem type absorption basin itself need take bigger space, thereby is subjected to the restriction of landform, geological conditions.
In sum, conventional absorption basin perhaps can not satisfy the generation of hydraulic jump because absorption basin is undersized, can not satisfy the requirement of abundant energy dissipating; Perhaps again because absorption basin is oversize to take up room also greatly, it faces simultaneously excessive absorption basin underflow speed and often the absorption basin base plate is damaged; Therefore, the effect of energy dissipation that conventional absorption basin and the trajectory bucket type energy of arranging in absorption basin thereof produce is undesirable, if the trajectory bucket type energy that is provided with in absorption basin can solve the above problem well, and this task of the present invention just place.
Summary of the invention
Purpose of the present invention is just at existing defective in the above-mentioned prior art, proposes a kind ofly to shorten absorption basin length on the basis that guarantees higher energy dissipation rate, thereby saves construction costs; And simple structure is convenient to maintenance; And can increase the discharge per unit width scope that hydraulic jump produces greatly; And the trajectory bucket type energy that in any conventional absorption basin, both can use the triangular flip bank that also can cooperate other auxiliary energy dissipaters' uses separately.
For realizing purpose of the present invention, the technical scheme that the present invention adopts following measure to constitute realizes.
Trajectory bucket type energy in the absorption basin of the present invention comprises absorption basin, according to the present invention, also be included in be provided with in the absorption basin choose the bank energy dissipater, this is chosen the bank energy dissipater and is the triangular flip bank along the water (flow) direction section further; This triangular flip bank is divided into forebay and two parts of after-bay with absorption basin; Its rise choose the position can absorption basin length 1/4～2/3 between change.
In the technique scheme, meet water with it angle on limit of the base of described triangular flip bank is 5～45 °.
In the technique scheme, the base of described triangular flip bank and its are 45 °～90 ° by the angle of waterside.
In the technique scheme, the base length of described triangular flip bank accounts for 1/6～1/3 of absorption basin total length.
In the technique scheme, described triangular flip bank transverse width is identical with the absorption basin width, and the vertical height of triangular flip bank is 1/8～1/4 of a triangular flip bank base length.
The triangular flip bank energy dissipater who is provided with in the absorption basin of the present invention both can use separately in absorption basin, also can use in conjunction with other auxiliary energy dissipaters that are provided with in the absorption basin simultaneously, all can reach ideal effect.
The present invention compared with prior art has following characteristics and useful technique effect:
1, trajectory bucket type energy of the present invention can guarantee to shorten absorption basin length on the basis of high energy dissipation rate, helps saving construction costs; Perhaps when absorption basin length is identical, still can improve energy dissipation rate.
2, trajectory bucket type energy of the present invention can increase the discharge per unit width scope that hydraulic jump takes place greatly, so energy dissipating efficient height.
3, trajectory bucket type energy of the present invention adopts the triangular flip bank that a complete absorption basin is divided into forebay and after-bay, and it is simple in structure, and is convenient to maintenance, has overcome compound absorption basin simultaneously and has not played the defective of choosing stream.
4, the triangular flip bank that in absorption basin confined space scope, is provided with of trajectory bucket type energy of the present invention, it takes up room less, and the scope of application is wide, and solved the tandem type absorption basin and taken up room big and defective that limited by landform, geological conditions, triangular flip bank of the present invention all can adopt in any conventional absorption basin; Also can cooperate other auxiliary energy dissipaters' uses in the absorption basin.
Description of drawings
Trajectory bucket type energy is the elevational schematic view of triangular flip bank in Fig. 1 absorption basin of the present invention;
Trajectory bucket type energy is the floor map of triangular flip bank in Fig. 2 absorption basin of the present invention;
Trajectory bucket type energy is set to the pool inner water stream fluidised form schematic diagram of triangular flip bank in Fig. 3 absorption basin of the present invention;
The embodiment schematic diagram that Fig. 4 trajectory bucket type energy triangular flip of the present invention bank is used in absorption basin;
Fig. 5 is an absorption basin base plate schematic three dimensional views among the embodiment of Fig. 4.
Among the figure, 1 absorption basin, 2 triangular flip banks, 211 triangular flip bank bases, the 212 triangular flip banks limit that meets water, 213 triangular flip banks be by the waterside, A triangular flip bank base with meet water the limit angle, B triangular flip bank base with by the waterside angle, b triangular flip bank transverse width, the vertical height of h triangular flip bank, l triangular flip bank base length, 3 absorption basin forebays, 4 absorption basin after-bays.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and operating principle and with specific embodiment, below described current consider be used to carry out most preferred embodiment of the present invention, be intended to describe General Principle of the present invention and triangular flip bank and constitute situation; But be not any qualification that means protection domain of the present invention.
Among Fig. 1 of the present invention, the trajectory bucket type energy that is provided with in absorption basin 1 is a triangular flip bank 2, and base 211 length of triangular flip bank 2 account for 1/6～1/3 of absorption basin total length, and the limit that meets water of triangular flip bank is 212, the triangular flip bank be 213 by the waterside; The meet water included angle A angle on limit 212 of triangular flip bank base 211 and triangular flip bank can change between 5～45 °; Triangular flip bank base 211 and triangular flip bank can be changed between 45～90 ° by the included angle B angle of waterside 213; Triangular flip bank height h is 1/8～1/4 of triangular flip bank base 211 length l.
As can be known, triangular flip bank width b is identical with absorption basin 1 width in the plan view of Fig. 2 of the present invention.
Triangular flip bank energy dissipater in the absorption basin of the present invention, its pool inner water stream energy dissipating principle as shown in Figure 3.When triangular flip bank energy dissipater is applied to hydraulic engineering, the jet of flood releasing structure outlet the reflection of triangular flip bank upstream face with choose stream make in the absorption basin turbulent fluctuation and reflux more fierce; Because the triangular flip bank is divided into forebay 3 and 4 two absorption basins of after-bay with whole absorption basin, make hydraulic jump in big discharge per unit width scope, all can stablize formation like this, discharge per unit width hour, energy dissipation by hydraulic jump may be abundant in the forebay, and after-bay has been protected the downstream apron section effectively as cushion pool; When discharge per unit width was big, then former and later two absorption basins all played a role, and backflow that the bottom forms and water cushion have reduced effectively and face underflow speed and go out the pond flow velocity, thereby have improved energy dissipation rate greatly.
Embodiment
Fig. 4 for the present invention in a certain hydraulic engineering, absorption basin is optimized in the hydraulic model test adopt the example that triangular flip bank 2 energy dissipaters are set in absorption basin, structurally, absorption basin 1 manufactures a continuous integral body with triangular flip bank 2.Triangular flip bank 2 is divided into forebay 3 and after-bay 4 two parts with absorption basin, wherein the triangular flip bank is l=20m along water (flow) direction length, be about 0.3 times of absorption basin total length, base 211 and limit 212 included angle A that meet water=10 ° are by waterside 213 and base included angle B=80 °, the vertical height h=3m of triangular flip bank, be 0.15 times of its base length, b is identical with the absorption basin width for triangular flip bank transverse width, is 30m, it rises chooses the position apart from absorption basin import 30m, is about absorption basin length 1/3.Show through experimental result, in absorption basin, increased the triangular flip bank after, can form stable hydraulic jump, the first place that jumps is put and is stabilized in the 10m scope of downstream, hole, the turbulent fluctuation of pool inner water stream is violent, effect of energy dissipation is remarkable; Water impact forms reflection to triangular flip bank face, spray seethes; Also formed backflow after choosing bank, water cushion is darker, has protected the absorption basin base plate effectively.If adopt conventional absorption basin, then absorption basin length needs 130m approximately, increased the triangular flip bank after, the absorption basin contraction in length is 87m, not only solved the restricted problem that geological conditions offsets the power pool size effectively, and absorption basin effect of energy dissipation and fluidised form are all very good under flows at different levels.Therefore, the present invention can directly be provided with triangular flip bank energy dissipater in conventional absorption basin, also can have on other auxiliary energy dissipater's the basis to set up triangular flip bank energy dissipater again in absorption basin, all can reach ideal effect.
Claims (5)
1. the trajectory bucket type energy that absorption basin is interior comprises absorption basin (1), it is characterized in that also being included in the bank of choosing that is provided with in the absorption basin (1), and this is chosen bank and is the triangular flip bank (2) along the water (flow) direction section; The triangular flip bank is divided into forebay (3) and (4) two parts of after-bay with absorption basin; Its rise choose the position absorption basin length 1/4～2/3 between.
2. meet water with it angle (A) of limit (212) of the trajectory bucket type energy in the absorption basin according to claim 1, the base (211) that it is characterized in that described triangular flip bank (2) is 5～45 °.
3. the trajectory bucket type energy in the absorption basin according to claim 1 is characterized in that the base (211) of described triangular flip bank (2) is 45 °～90 ° with it by the angle of waterside (213) (B).
4. the trajectory bucket type energy in the absorption basin according to claim 1 and 2 is characterized in that base (211) length (l) of described triangular flip bank (2) accounts for 1/6～1/3 of absorption basin (1) total length.
5. the trajectory bucket type energy in the absorption basin according to claim 1 and 2, it is characterized in that described triangular flip bank transverse width (b) is identical with absorption basin (1) width, the vertical height of triangular flip bank (h) is 1/8～1/4 of triangular flip bank base (a 211) length.
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| CN2009100586587A CN101538840B (en) | 2009-03-20 | 2009-03-20 | Trajectory jet type energy dissipater in absorption basin |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383401A (en) * | 2011-08-09 | 2012-03-21 | 曾皋波 | Overflow water drainage integral type sluice weir |
| CN102888828A (en) * | 2012-10-22 | 2013-01-23 | 四川大学 | Water-pillow pool method used for overflow cofferdam energy dissipation platform |
| CN103266584A (en) * | 2013-06-05 | 2013-08-28 | 中国水利水电第七工程局有限公司 | Novel water conservancy project energy dissipater structure |
| CN104695391A (en) * | 2015-02-13 | 2015-06-10 | 水利部交通运输部国家能源局南京水利科学研究院 | Diffusion type inverse step rectification and energy dissipation method and absorption basin |
| CN109594534A (en) * | 2018-12-28 | 2019-04-09 | 四川大学 | It is differential to fall bank type stilling pond |
| CN110616690A (en) * | 2019-09-05 | 2019-12-27 | 四川大学 | Energy dissipation pool with torrent dispersing flip bucket |
| CN111121854A (en) * | 2019-12-31 | 2020-05-08 | 南昌工程学院 | Device for measuring energy dissipation rate of trajectory jet energy dissipater and using method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2524029A1 (en) * | 1982-03-23 | 1983-09-30 | Biesel Francis | PROTECTION OF WALLS IN CONTACT WITH LIQUIDS AGAINST QUICK PRESSURE FLUCTUATIONS |
| JP4137832B2 (en) * | 2004-03-29 | 2008-08-20 | 関西電力株式会社 | Derating structure and discharge path used for it |
| CN200946261Y (en) * | 2006-06-12 | 2007-09-12 | 河海大学 | Differential type flip bucket for mixing air |
| CN100554593C (en) * | 2007-10-30 | 2009-10-28 | 四川大学 | Doped gas device preposed ladder energy dissipater |
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- 2009-03-20 CN CN2009100586587A patent/CN101538840B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102383401A (en) * | 2011-08-09 | 2012-03-21 | 曾皋波 | Overflow water drainage integral type sluice weir |
| CN102888828A (en) * | 2012-10-22 | 2013-01-23 | 四川大学 | Water-pillow pool method used for overflow cofferdam energy dissipation platform |
| CN103266584A (en) * | 2013-06-05 | 2013-08-28 | 中国水利水电第七工程局有限公司 | Novel water conservancy project energy dissipater structure |
| CN103266584B (en) * | 2013-06-05 | 2015-08-19 | 中国水利水电第七工程局有限公司 | A kind of hydraulic engineering energy dissipating construction |
| CN104695391A (en) * | 2015-02-13 | 2015-06-10 | 水利部交通运输部国家能源局南京水利科学研究院 | Diffusion type inverse step rectification and energy dissipation method and absorption basin |
| CN109594534A (en) * | 2018-12-28 | 2019-04-09 | 四川大学 | It is differential to fall bank type stilling pond |
| CN110616690A (en) * | 2019-09-05 | 2019-12-27 | 四川大学 | Energy dissipation pool with torrent dispersing flip bucket |
| CN111121854A (en) * | 2019-12-31 | 2020-05-08 | 南昌工程学院 | Device for measuring energy dissipation rate of trajectory jet energy dissipater and using method |
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| CN101538840B (en) | 2011-02-09 |
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