CN104805797B - Forebay of Pumping Station inverted T shape dam fluidised form improves devices and methods therefor - Google Patents
Forebay of Pumping Station inverted T shape dam fluidised form improves devices and methods therefor Download PDFInfo
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- CN104805797B CN104805797B CN201510211288.1A CN201510211288A CN104805797B CN 104805797 B CN104805797 B CN 104805797B CN 201510211288 A CN201510211288 A CN 201510211288A CN 104805797 B CN104805797 B CN 104805797B
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Abstract
The present invention relates to a kind of Forebay of Pumping Station inverted T shape dam fluidised form and improve devices and methods therefor, the baffle arranged including forebay and rear portion, internal reflux district, forebay, front portion, forebay connects inlet culvert, rear portion, forebay is provided with intake pool, it is characterized in that: described baffle is inverted T shape dam, inverted T shape dam is inverted T-shaped at the section being perpendicular to water (flow) direction, far from intake pool distance is forebay length 0.2 0.4 times of inverted T shape dam, described inverted T shape dam is made up of Xia Ba and upper dam, and upper dam is arranged on lower dam upper middle position；Described lower dam is cuboid, and lower dam length degree is equal with the width of forebay, and lower dam width degree is 0.5 times that forebay pool inner water is deep, and lower height of dam degree is 0.4 times that forebay pool inner water is deep；Described upper dam is cuboid, 0.1 times of a length of forebay, upper dam width, and upper dam width degree is 0.5 times that forebay pool inner water is deep, and upper height of dam degree is 0.4 times that forebay pool inner water is deep.By the present invention, improve fluidised form and alluvial problem present in Forebay of Pumping Station.
Description
Technical field
The present invention relates to a kind of Forebay of Pumping Station inverted T shape dam fluidised form and improve devices and methods therefor, belong to Forebay of Pumping Station design field.
Background technology
Forebay is an important component part in pumping plant building, and can its version is related to current be diffused into intake pool from flume smooth-going.Impact due to many factors so that both sides, forebay are commonly present recirculating zone.Forebay is commonly present the backflow in big region so that the energy of water pump and cavitation performance decline, and even can cause pump cavitation and vibration time serious, endanger pumping plant safety.The existence simultaneously refluxed makes the flow rate of water flow at front pool side wall less than silt non-silting velocity, causesRecirculating zoneSignificantly Sediment Siltation, deteriorates flow condition further.
In forebay, concrete flow condition improvement countermeasures and principle thereof include as follows:
(1) set deflector, training wall, airflow fence etc. and smooth out current on the trend；Current flow through the process of airflow fence and are similar to blade lattice streaming, when current flow through them, the hydrodynamism produced due to grizzly bar, react on water body, water body inward wall is tilted, thus counteract the some effects of inertia force, limit the spreading effect of curve inner side water body, can effectively eliminate separation of flow district.The measure such as airflow fence simultaneously can also prevent the secondary back on section from structure, inhibits the helical flow in forebay.
(2) set water squeezing plate compressing current flowing and improve fluidised form；After intake pool sets water squeezing plate, current directly impact water squeezing plate, under the effect of water squeezing plate, current are forced to turn to basic motion, and current are provoked in the process, rolling, form the state of turbulent fluctuation diffusion, underflow mutually blends with surface current, and the flow velocity along main flow direction is redistributed so that obtain more uniform water inlet current at intakes of pumping station
(3) arranging column utilizes swirl principle to improve fluidised form；When water body flows through column, current are divided, force current direction both sides to be spread, current separate in column downstream, and causing the plane whirlpool district of some strength, this district's water body and surrounding water constantly to carry out momentum-exchange so that column downstream Flow Field Distribution nearby is uniform.
This kind of water conservancy diversion measure improves Forebay of Pumping Station water inlet velocity flow profile, eliminates large-area recirculating zone, but still suffers from that some are the most not enough, or is unfavorable for construction;Or because baffle design is improper, the separation of flow district after baffle is easily generated Karman vortex street and enters pumping plant import, directly results in whirlpool and enters the pump housing, causes unit vibration.
Summary of the invention
It is an object of the invention to for fluidised form present in existing Forebay of Pumping Station and alluvial problem, it is provided that a kind of Forebay of Pumping Station inverted T shape dam fluidised form improves devices and methods therefor.
The technical scheme is that, a kind of Forebay of Pumping Station inverted T shape dam fluidised form improves device, the baffle arranged including forebay and rear portion, internal reflux district, forebay, forebay anterior (upstream) connects inlet culvert, rear portion, forebay (downstream) is provided with intake pool, it is characterized in that: described baffle is inverted T shape dam, inverted T shape dam is inverted T-shaped at the section being perpendicular to water (flow) direction, far from intake pool 0.2-0.4 times that distance is forebay length of inverted T shape dam, described inverted T shape dam is made up of Xia Ba and upper dam, and upper dam is arranged on lower dam upper middle position；Described lower dam is cuboid, and lower dam length degree is equal with the width of forebay, and lower dam width degree is 0.5 times that forebay pool inner water is deep, and lower height of dam degree is 0.4 times that forebay pool inner water is deep；Described upper dam is cuboid, 0.1 times of a length of forebay, upper dam width, and upper dam width degree is 0.5 times that forebay pool inner water is deep, and upper height of dam degree is 0.4 times that forebay pool inner water is deep.
The described upper dam distance far from recirculating zone, forebay is 0.45 times that pond, forebay is wide.
Xia Ba, the Shang Ba on described T-shaped dam are concrete component.
Far from intake pool distance is forebay length 0.3 times of described inverted T shape dam.
A kind of Forebay of Pumping Station inverted T shape dam fluidised form ameliorative way, inlet culvert is connected including forebay anterior (upstream), rear portion, forebay (downstream) arranges intake pool, it is characterized in that: at rear portion, internal reflux district, forebay, inverted T shape dam is set, inverted T shape dam is vertical with water (flow) direction, inverted T shape dam is inverted T-shaped at the section being perpendicular to water (flow) direction, far from intake pool 0.2-0.4 times that distance is forebay length of inverted T shape dam；Described inverted T shape dam is made up of Xia Ba and upper dam, and upper dam is arranged on lower dam upper middle position；Upper dam, to stopping from the current before dam and shunting, destroys the flowing of current at this stable, and the energy exchange of current in reinforcement forebay, improves the flow rate of water flow of side, big recirculating zone, forebay, reduce the Sediment Siltation of side, big recirculating zone further；The current that lower dam passes through on which utilize vortex effect, by blending current, strengthen the diffusion of turbulent fluctuation energy so that water body momentum is redistributed, and obtain more uniform velocity flow profile and enter intake pool, improve pumping plant flow condition in the forebay behind the dam on inverted T shape dam；Described lower dam is cuboid, and lower dam length degree is equal with the width of forebay, and lower dam width degree is 0.5 times that forebay pool inner water is deep, and lower height of dam degree is 0.4 times that forebay pool inner water is deep；Described upper dam is cuboid, 0.1 times of a length of forebay, upper dam width, and upper dam width degree is 0.5 times that forebay pool inner water is deep, and upper height of dam degree is 0.4 times that forebay pool inner water is deep.
The described upper dam distance far from recirculating zone is 0.45 times that pond, forebay is wide.
Xia Ba, the Shang Ba on described T-shaped dam are concrete component, use prefabricated mode separately to pour Xia Ba, Shang Ba, are then arranged on the base plate of forebay on lower dam, upper dam is arranged on lower dam upper middle position.
Far from intake pool distance is forebay length 0.3 times of described inverted T shape dam.
Present configuration rationally, simple and science, be theoretical based on fluid mechanics principle, geometry of space and Design of Pump Station, the innovation to fluidised form ameliorative way；Under described inverted T shape dam, dam utilizes vortex effect, by blending current, strengthens the diffusion of turbulent fluctuation energy so that water body momentum is redistributed, and obtains more uniform velocity flow profile behind the dam on inverted T shape dam；Dam on inverted T shape dam, current before dam are had stop and shunting action, owing to upper dam is arranged on forebay, there is side, bigger recirculating zone, destroy the flowing of current at this stable, further enhance the energy exchange of current in forebay, improve the flow rate of water flow of side, big recirculating zone, forebay simultaneously, i.e. improve the flow condition of Bian Bi side unit, be reduced again that this side is too low due to flow velocity and the Sediment Siltation problem that causes.
Along with country's large pumping station technological transformation and the construction of South-to-North Water Transfer Project, enforcement, the Inlet flow pattern having up to a hundred pumping plants altogether needs to improve, therefore the application of this patent and enforcement, for there is the pumping plant of bad fluidised form in forebay, have significant fluidised form to improve effect.This will produce bigger economic worth and social benefit.The mode of anticipated transfer is: 1) designing institute is designed with；2) engineered middle enforcement.
Accompanying drawing explanation
Fig. 1 is inverted T shape dam layout drawing.
Fig. 2 is without measure Forebay of Pumping Station fluidised form figure.
Forebay of Pumping Station fluidised form figure after the fluidised form improvement of Fig. 3 inverted T shape dam.
Fig. 4 pumping plant unit approach velocity scattergram (hopeless inverted T shape dam of granting compares).
In figure: 1 inlet culvert, 2 forebays, 3 intake pools, 4 times dams, on 5 dam.
Detailed description of the invention
Illustrate that the invention will be further described with accompanying drawing below in conjunction with the accompanying drawings.
Arranging inverted T shape dam in intake front pool 2, inverted T shape dam is far from position depending on fluidised form concrete in forebay, and the inverted T shape dam distance far from intake pool 3 can be 0.2-0.4 times of forebay 2 length, it is proposed that the inverted T shape dam distance far from intake pool 3 is set to 0.3 times of forebay 2 length.
In forebay 2, anterior (upstream) connects inlet culvert 1, and rear portion, forebay 2 (downstream) arranges intake pool 3, arranges inverted T shape dam at rear portion, internal reflux district, forebay 2, and inverted T shape dam is vertical with water (flow) direction, and inverted T shape dam is inverted T-shaped at the section being perpendicular to water (flow) direction；Inverted T shape dam is far from position depending on fluidised form concrete in forebay, and the inverted T shape dam distance far from intake pool 3 can be 0.2-0.4 times of forebay 2 length, it is proposed that the inverted T shape dam distance far from intake pool 3 is set to 0.3 times of forebay 2 length.
In the present invention, inverted T shape dam is made up of lower dam 4 and upper dam 5, and upper dam 5 is arranged on lower dam 4 upper middle position；Lower dam 4 is cuboid, and lower dam 4 length is equal with the width of forebay 2, and lower dam 4 width is 0.5 times that forebay 2 pool inner water is deep, and lower dam 4 height is 0.4 times that forebay 2 pool inner water is deep；Upper dam 5 is cuboid, 0.1 times of a length of forebay 2, upper dam 5 width, and upper dam 5 width is 0.5 times that forebay 2 pool inner water is deep, and upper dam 5 height is 0.4 times that forebay 2 pool inner water is deep.
By the present invention, upper dam 5, to stopping from the current before dam and shunting, destroys the flowing of current at this stable, and the energy exchange of current in reinforcement forebay 2, improves the flow rate of water flow of big side, recirculating zone, forebay 2, reduce the Sediment Siltation of side, big recirculating zone further；The current that lower dam 4 passes through on which utilize vortex effect, by blending current, strengthen the diffusion of turbulent fluctuation energy so that water body momentum is redistributed, and obtain more uniform velocity flow profile and enter intake pool, improve pumping plant flow condition in the forebay 2 behind the dam on inverted T shape dam.
Further, the upper dam 5 distance away from recirculating zone be that pond, forebay 2 is wide 0.45 times.In the present invention, the lower dam 4 on T-shaped dam, upper dam 5 are concrete component, use prefabricated mode separately to pour lower dam 4, upper dam 5, are then arranged on the base plate of forebay 2 on lower dam 4, upper dam 5 is arranged on lower dam 4 upper middle position；Certainly inverted T shape dam also can be in cast-in-place mode.
Claims (5)
1. a Forebay of Pumping Station inverted T shape dam fluidised form improves device, the baffle arranged including forebay (2) and rear portion, forebay (2) internal reflux district, forebay (2) is anterior connects inlet culvert (1), forebay (2) rear portion is provided with intake pool (3), it is characterized in that: described baffle is inverted T shape dam, inverted T shape dam is inverted T-shaped at the section being perpendicular to water (flow) direction, the inverted T shape dam distance far from intake pool (3) is 0.2-0.4 times of forebay (2) length, described inverted T shape dam is made up of lower dam (4) and upper dam (5), and upper dam (5) are arranged on lower dam (4) upper middle position；Described lower dam (4) is cuboid, and lower dam (4) length is equal with the width of forebay (2), and lower dam (4) width is 0.5 times that forebay (2) pool inner water is deep, and lower dam (4) height is 0.4 times that forebay (2) pool inner water is deep；Described upper dam (5) is cuboid, 0.1 times of upper dam (5) a length of forebay (2) width, and upper dam (5) width is 0.5 times that forebay (2) pool inner water is deep, and upper dam (5) height is 0.4 times that forebay (2) pool inner water is deep；The described upper dam (5) distance away from forebay (2) recirculating zone is 0.45 times that forebay (2) pond is wide；Far from intake pool (3) 0.3 times that distance is forebay (2) length of described inverted T shape dam.
2. a Forebay of Pumping Station inverted T shape dam fluidised form ameliorative way, inlet culvert (1) is connected including forebay (2) are anterior, forebay (2) rear portion arranges intake pool (3), it is characterized in that: at rear portion, forebay (2) internal reflux district, inverted T shape dam is set, inverted T shape dam is vertical with water (flow) direction, inverted T shape dam is inverted T-shaped at the section being perpendicular to water (flow) direction, and the inverted T shape dam distance far from intake pool (3) is 0.2-0.4 times of forebay (2) length；Described inverted T shape dam is made up of lower dam (4) and upper dam (5), and upper dam (5) are arranged on lower dam (4) upper middle position；Upper dam (5), to stopping from the current before dam and shunting, destroys the flowing of current at this stable, strengthens the energy exchange of forebay (2) interior current further, improves the flow rate of water flow of big side, recirculating zone, forebay (2), reduces the Sediment Siltation of side, big recirculating zone；The current that lower dam (4) is passed through on which utilize vortex effect, by blending current, strengthen the diffusion of turbulent fluctuation energy so that water body momentum is redistributed, obtain more uniform velocity flow profile in forebay (2) behind the dam on inverted T shape dam and enter intake pool, improve pumping plant flow condition；Described lower dam (4) is cuboid, and lower dam (4) length is equal with the width of forebay (2), and lower dam (4) width is 0.5 times that forebay (2) pool inner water is deep, and lower dam (4) height is 0.4 times that forebay (2) pool inner water is deep；Described upper dam (5) is cuboid, 0.1 times of upper dam (5) a length of forebay (2) width, and upper dam (5) width is 0.5 times that forebay (2) pool inner water is deep, and upper dam (5) height is 0.4 times that forebay (2) pool inner water is deep.
A kind of Forebay of Pumping Station inverted T shape dam the most according to claim 2 fluidised form ameliorative way, is characterized in that: the described upper dam (5) distance away from recirculating zone is 0.45 times that forebay (2) pond is wide.
A kind of Forebay of Pumping Station inverted T shape dam the most according to claim 2 fluidised form ameliorative way, it is characterized in that: the lower dam (4) on described T-shaped dam, upper dam (5) are concrete component, prefabricated mode is used separately to pour lower dam (4), upper dam (5), then lower dam (4) are arranged on forebay (2) base plate, upper dam (5) are arranged on lower dam (4) upper middle position.
A kind of Forebay of Pumping Station inverted T shape dam the most according to claim 2 fluidised form ameliorative way, is characterized in that: far from intake pool (3) 0.3 times that distance is forebay (2) length of described inverted T shape dam.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105909566B (en) * | 2016-05-17 | 2019-07-02 | 中国农业大学 | A kind of pumping plant water inlet flow field combined type control whirlpool facility |
| CN108629070A (en) * | 2018-03-06 | 2018-10-09 | 河海大学 | A kind of lateral influent stream pumping plant model test method for rectifying |
| CN109487896A (en) * | 2018-11-28 | 2019-03-19 | 扬州大学 | Utilize the Forebay of Pumping Station in trigone diversion column control whirlpool |
| CN109797715B (en) * | 2019-01-21 | 2020-07-17 | 河海大学 | Method for optimizing hydraulic flow state of diffusion section of aqueduct |
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