CN104805809B - The Forebay of Pumping Station type of falling π dam fluidised form improves devices and methods therefor - Google Patents
The Forebay of Pumping Station type of falling π dam fluidised form improves devices and methods therefor Download PDFInfo
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- CN104805809B CN104805809B CN201510211219.0A CN201510211219A CN104805809B CN 104805809 B CN104805809 B CN 104805809B CN 201510211219 A CN201510211219 A CN 201510211219A CN 104805809 B CN104805809 B CN 104805809B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
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Abstract
The invention discloses a kind of Forebay of Pumping Station type of falling π 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 the type of falling π dam, the type of falling π dam is similar to the shape of the letter π that stands upside down, far from intake pool distance is forebay length 0.2 0.4 times of the type of falling π dam at the section being perpendicular to water (flow) direction；The type of falling π dam includes lower dam and two the upper dams being arranged symmetrically on dam；The lower dam on the described type of falling π dam is cuboid, and length is equal with the width of forebay, and width is 0.5 times that forebay pool inner water is deep, and height is 0.4 times that forebay pool inner water is deep；The upper dam on the described type of falling π dam is cuboid, 0.1 times of a length of forebay width, and width is 0.5 times that forebay pool inner water is deep, and height is 0.4 times that forebay pool inner water is deep.By the present invention, improve water feeding of water pump condition, improve pumping plant performance and stability.
Description
Technical field
The present invention relates to a kind of water engineering facility, the specifically a kind of Forebay of Pumping Station type of falling π dam fluidised form is improved devices and methods therefor, is belonged to hydraulic engineering technical field.
Background technology
Intake front pool is to connect flume and the building of intake pool in pumping plant, and the quality of its design is related to the safe and stable operation of pumping plant.Because the fluidised form of current is affected by various factors in forebay so that both sides, forebay are in recirculating zone, and this can ring the Inlet flow pattern of intake pool, and then affects pump performance, time serious, even can cause pump cavitation and vibration, endanger pumping plant safety.The existence of recirculating zone simultaneously can cause Sediment Siltation in the problem of both sides, forebay so that flow condition more deteriorates.
The most domestic three classes can be divided mainly into for the ameliorative way of fluidised form in forebay: one is to smooth out current on the trend, such as deflector, training wall, airflow fence etc. by arranging engineering measure.Two is by setting structures change area of passage, forcing the exchange of current generation energy, improve fluidised form, such as water squeezing plate.Three is to utilize swirl principle to improve fluidised form, Ru Dikan, column etc..
But these flow condition improvement countermeasures still have deficiency, or a constructional difficulties, or improving effect inconspicuous for there is the fluidised form in the forebay of asymmetric whirlpool, the problem that there is Sediment Siltation especially for the forebay sidewall caused by bad fluidised form does not has improvement result.
Summary of the invention
It is an object of the invention to have problems in existing Forebay of Pumping Station, by arranging, solution forebay, the type of falling π dam exists backflow and the problem remained in a standstill, improve the flow condition of water pump, improve performance and the operation stability of pumping plant.
The technical scheme is that, a kind of Forebay of Pumping Station type of falling π dam fluidised form improves device, 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 the type of falling π dam, the type of falling π dam is similar to the shape of the letter π that stands upside down, far from intake pool 0.2-0.4 times that distance is forebay length of the type of falling π dam at the section being perpendicular to water (flow) direction；The type of falling π dam includes lower dam and two the upper dams being arranged symmetrically on lower dam；The lower dam on the described type of falling π dam is cuboid, and length is equal with the width of forebay, and width is 0.5 times that forebay pool inner water is deep, and height is 0.4 times that forebay pool inner water is deep；The upper dam on the described type of falling π dam is cuboid, 0.1 times of a length of forebay width, and width is 0.5 times that forebay pool inner water is deep, and height is 0.4 times that forebay pool inner water is deep.
Far from intake pool distance is forebay length 0.3 times of the described type of falling π dam.
Xia Ba, the Shang Ba on the described type of falling π dam are concrete component.
A kind of Forebay of Pumping Station type of falling π dam fluidised form ameliorative way, inlet culvert is connected including front portion, forebay, rear portion, forebay arranges intake pool, it is characterized in that: the type of falling π dam is set at rear portion, internal reflux district, forebay, the type of falling π dam is similar to the shape of the letter π that stands upside down, far from intake pool 0.2-0.4 times that distance is forebay length of the type of falling π dam at the section being perpendicular to water (flow) direction；The type of falling π dam includes lower dam and two the upper dams being arranged symmetrically on lower dam；Current are stopped by lower dam, and formation is choked water, and small part current are obstructed before the lower dam on the type of falling π dam and form less recirculating zone, major part current then flow up along the type of falling π dam, and now current area reduces, and current water body tends to shrinking, pressure reduces, thus the flow velocity of current drastically raises；Upper dam is to stopping from the current before dam and shunting, promote current that horizontal energy exchange occurs, reduce flow rate of water flow in the middle part of forebay, improve forebay side-walls flow rate of water flow, the forebay side-walls flow velocity make originally to be in backflow, remaining in a standstill is more than the non-silting velocity of silt, silt is swept along by current, flows out with current, reduces the Sediment Siltation of side, recirculating zone；Through blending current, strengthening the diffusion of turbulent fluctuation energy, the water body momentum of current is redistributed, and obtains more uniform velocity flow profile and enters intake pool, improve pumping plant flow condition in the forebay behind the type of falling π dam；The lower dam on the described type of falling π dam is cuboid, and length is equal with the width of forebay, and width is 0.5 times that forebay pool inner water is deep, and height is 0.4 times that forebay pool inner water is deep；The upper dam on the described type of falling π dam is cuboid, 0.1 times of a length of forebay width, and width is 0.5 times that forebay pool inner water is deep, and height is 0.4 times that forebay pool inner water is deep.
Far from intake pool distance is forebay length 0.3 times of the described type of falling π dam.
Xia Ba, the Shang Ba on the described type of falling π 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, then are arranged symmetrically with on two upper dams and are arranged on lower dam upper position.
Present configuration installation simple, easily fabricated, method is advanced, science.Anterior (upstream) current in the lower dam on the type of falling π dam are owing to being stopped, formation is choked water, and form less recirculating zone except part current are obstructed before dam, and main flow then flows up along dam, and owing to discharge area reduces, water body tends to shrinking, and pressure reduces, and flow velocity drastically raises.By blending current, strengthen the diffusion of turbulent fluctuation energy so that water body momentum is redistributed, and obtains more uniform velocity flow profile behind dam.The upper dam on the type of falling π dam mainly blocks water shunting, promotes current that horizontal energy exchange occurs, reduces flow rate of water flow in the middle part of forebay, improve side-walls flow rate of water flow, at the limit wall make originally to be in backflow, remaining in a standstill, flow velocity is more than the non-silting velocity of silt so that silt is swept along by current, flows out with current.
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 this patent can be applied and implement, and for there is the pumping plant of bad fluidised form in forebay, has 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 type of falling π dam layout drawing
Fig. 2 is without measure Forebay of Pumping Station fluidised form figure
Fluidised form figure after the fluidised form improvement of Fig. 3 type of falling π dam
Fig. 4 pumping plant unit approach velocity scattergram (the hopeless type of falling π dam of granting compares)
In figure, 1 inlet culvert, 2 forebays, 3 type of falling π dams, 4 intake pools.
Detailed description of the invention
Illustrate that the invention will be further described with accompanying drawing below in conjunction with the accompanying drawings.
The anterior connection inlet culvert 1 in forebay 2, rear portion, forebay 2 arranges intake pool 4, arranges the type of falling π dam 3 at rear portion, internal reflux district, forebay 2, and the type of falling π dam 3 is similar to the shape of the letter π that stands upside down at the section being perpendicular to water (flow) direction；Position, the type of falling π dam 3 is depending on fluidised form concrete in forebay 2, and the type of the falling π dam 3 distance away from intake pool 4 can be 0.2-0.4 times of forebay 2 length, optimal, and the type of the falling π dam 3 distance away from intake pool 4 is 0.3 times of forebay 2 length；The type of falling π dam 3 includes lower dam and two the upper dams being arranged symmetrically on lower dam；Current are stopped by lower dam, and formation is choked water, and small part current are obstructed before the lower dam on the type of falling π dam 3 and form less recirculating zone, major part current then flow up along the type of falling π dam 3, and now current area reduces, and current water body tends to shrinking, pressure reduces, thus the flow velocity of current drastically raises；Upper dam is to stopping from the current before dam and shunting, promote current that horizontal energy exchange occurs, reduce flow rate of water flow in the middle part of forebay 2, improve forebay 2 side-walls flow rate of water flow, the forebay 2 side-walls flow velocity make originally to be in backflow, remaining in a standstill is more than the non-silting velocity of silt, silt is swept along by current, flows out with current, reduces the Sediment Siltation of side, recirculating zone；Through blending current, strengthening the diffusion of turbulent fluctuation energy, the water body momentum of current is redistributed, and obtains more uniform velocity flow profile and enters intake pool 4, improve pumping plant flow condition in the forebay 2 behind the type of falling π dam 3；The lower dam on the described type of falling π dam 3 is cuboid, and length is equal with the width of forebay 2, and width is 0.5 times that forebay 2 pool inner water is deep, and height is 0.4 times that forebay 2 pool inner water is deep；The upper dam on the described type of falling π dam 3 is cuboid, 0.1 times of a length of forebay 2 width, and width is 0.5 times that forebay 2 pool inner water is deep, and height is 0.4 times that forebay 2 pool inner water is deep.
In the present invention, Xia Ba, the Shang Ba on the described type of falling π dam 3 are concrete component, use prefabricated mode separately to pour Xia Ba, Shang Ba, are then arranged on the base plate of forebay 2 on lower dam, then are arranged symmetrically with on two upper dams and are arranged on lower dam upper position.The concrete component of two cuboids is arranged symmetrically with the entrance location along water (flow) direction correspondence intake pool 4 both sides with bigger water inlet flow velocity.
In the present invention, Xia Ba, the Shang Ba on the type of falling π dam 3 are concrete component, use prefabricated mode separately to pour Xia Ba, Shang Ba, are then arranged on the base plate of forebay 2 on lower dam, then are arranged symmetrically with on two upper dams and are arranged on lower dam upper position.Certainly in being embodied as, it would however also be possible to employ cast-in-place mode.
Claims (6)
1. the Forebay of Pumping Station type of falling a π 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 (4), it is characterized in that: described baffle is the type of falling π dam (3), the type of falling π dam (3) is in the shape of the section handstand letter π being perpendicular to water (flow) direction, and the type of falling π dam (3) distance away from intake pool (4) is 0.2-0.4 times of forebay (2) length；The type of falling π dam (3) includes lower dam and two the upper dams being arranged symmetrically on lower dam；The lower dam of the described type of falling π dam (3) is cuboid, and length is equal with the width of forebay (2), and width is 0.5 times that forebay (2) pool inner water is deep, and height is 0.4 times that forebay (2) pool inner water is deep；The upper dam of the described type of falling π dam (3) is cuboid, 0.1 times of a length of forebay (2) width, and width is 0.5 times that forebay (2) pool inner water is deep, and height is 0.4 times that forebay (2) pool inner water is deep.
The Forebay of Pumping Station type of falling π dam the most according to claim 1 fluidised form improves device, it is characterized in that: away from intake pool (4) 0.3 times that distance is forebay (2) length of the described type of falling π dam (3).
The Forebay of Pumping Station type of falling π dam the most according to claim 1 fluidised form improves device, it is characterized in that: Xia Ba, Shang Ba of the described type of falling π dam (3) are concrete component.
4. the Forebay of Pumping Station type of falling a π dam fluidised form ameliorative way, inlet culvert (1) is connected including forebay (2) are anterior, forebay (2) rear portion arranges intake pool (4), it is characterized in that: the type of falling π dam (3) is set at rear portion, forebay (2) internal reflux district, the type of falling π dam (3) is in the shape of the section handstand letter π being perpendicular to water (flow) direction, and the type of falling π dam (3) distance away from intake pool (4) is 0.2-0.4 times of forebay (2) length；The type of falling π dam (3) includes lower dam and two the upper dams being arranged symmetrically on lower dam；Current are stopped by lower dam, formation is choked water, small part current are obstructed before the lower dam of the type of falling π dam (3) and form less recirculating zone, major part current then flow up along the type of falling π dam (3), now current area reduces, current water body tends to shrinking, and pressure reduces, thus the flow velocity of current drastically raises；Upper dam is to stopping from the current before dam and shunting, promote current that horizontal energy exchange occurs, reduce middle part, forebay (2) flow rate of water flow, improve forebay (2) side-walls flow rate of water flow, forebay (2) the side-walls flow velocity make originally to be in backflow, remaining in a standstill is more than the non-silting velocity of silt, silt is swept along by current, flows out with current, reduces the Sediment Siltation of side, recirculating zone；Through blending current, strengthening the diffusion of turbulent fluctuation energy, the water body momentum of current is redistributed, and obtains more uniform velocity flow profile and enters intake pool (4), improve pumping plant flow condition in the forebay (2) after the type of falling π dam (3)；The lower dam of the described type of falling π dam (3) is cuboid, and length is equal with the width of forebay (2), and width is 0.5 times that forebay (2) pool inner water is deep, and height is 0.4 times that forebay (2) pool inner water is deep；The upper dam of the described type of falling π dam (3) is cuboid, 0.1 times of a length of forebay (2) width, and width is 0.5 times that forebay (2) pool inner water is deep, and height is 0.4 times that forebay (2) pool inner water is deep.
The Forebay of Pumping Station type of falling π dam the most according to claim 4 fluidised form ameliorative way, is characterized in that: away from intake pool (4) 0.3 times that distance is forebay (2) length of the described type of falling π dam (3).
The Forebay of Pumping Station type of falling π dam the most according to claim 4 fluidised form ameliorative way, it is characterized in that: Xia Ba, Shang Ba of the described type of falling π dam (3) are concrete component, prefabricated mode is used separately to pour Xia Ba, Shang Ba, then lower dam is arranged on forebay (2) base plate, then two upper dams are arranged symmetrically with are arranged on lower dam upper position.
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| CN201510211219.0A CN104805809B (en) | 2015-04-29 | 2015-04-29 | The Forebay of Pumping Station type of falling π dam fluidised form improves devices and methods therefor |
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| CN105735207B (en) * | 2016-04-18 | 2017-11-28 | 辽宁省水利水电勘测设计研究院 | Automatic balance type bifurcation pivot |
| CN106988380A (en) * | 2017-05-10 | 2017-07-28 | 扬州大学 | A kind of water intake pumping station water inlet perforation water distribution tracery wall and its method for rectifying |
| CN110952648A (en) * | 2019-12-09 | 2020-04-03 | 扬州大学 | Structure and method for regulating and controlling diffusion flow of front pool of pump station |
| CN111172937B (en) * | 2020-02-23 | 2021-05-18 | 扬州大学 | T-shaped contact bottom hole structure and comprehensive rectification method thereof |
| CN111305161B (en) * | 2020-04-08 | 2024-02-23 | 扬州大学 | Telescopic guide wall and operation method thereof |
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| RU2275458C1 (en) * | 2004-08-10 | 2006-04-27 | Открытое Акционерное общество "Красноярский проектно-изыскательский институт "Гидропроект" | Gully two-stage slurry dump for granular industrial waste |
| CN102312465B (en) * | 2010-07-06 | 2014-03-05 | 中国核电工程有限公司 | Short radius and spacing intake tunnel pump room of nuclear power station |
| CN102465509A (en) * | 2010-11-14 | 2012-05-23 | 张琳 | Large dam with energy dissipation capability |
| CN202626947U (en) * | 2012-06-11 | 2012-12-26 | 珠江水利委员会珠江水利科学研究院 | Picking flow type flaring pier of overflow dam |
| CN203222785U (en) * | 2013-04-27 | 2013-10-02 | 扬州大学 | Y-shaped flow guiding pier used for forebay rectification |
| CN104005448B (en) * | 2014-05-23 | 2016-07-06 | 上海市水利工程设计研究院有限公司 | A kind of Wall in Plain Reservoir intake structure |
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