CN111576324B - Channel type forebay of large-scale pump station and design method - Google Patents

Channel type forebay of large-scale pump station and design method Download PDF

Info

Publication number
CN111576324B
CN111576324B CN202010434542.5A CN202010434542A CN111576324B CN 111576324 B CN111576324 B CN 111576324B CN 202010434542 A CN202010434542 A CN 202010434542A CN 111576324 B CN111576324 B CN 111576324B
Authority
CN
China
Prior art keywords
section
forebay
channel
flow passage
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010434542.5A
Other languages
Chinese (zh)
Other versions
CN111576324A (en
Inventor
徐磊
陆林广
陆伟刚
刘军
施伟
王亦斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yangzhou University
Original Assignee
Yangzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yangzhou University filed Critical Yangzhou University
Priority to CN202010434542.5A priority Critical patent/CN111576324B/en
Publication of CN111576324A publication Critical patent/CN111576324A/en
Application granted granted Critical
Publication of CN111576324B publication Critical patent/CN111576324B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
    • 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
    • E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/041—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours using active mechanical means, e.g. fluidizing or pumping
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B5/00—Artificial water canals, e.g. irrigation canals
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/22—Adaptations of pumping plants for lifting sewage
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • Computer Hardware Design (AREA)
  • Mechanical Engineering (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Pure & Applied Mathematics (AREA)
  • Evolutionary Computation (AREA)
  • Algebra (AREA)
  • Ocean & Marine Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Computing Systems (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Architecture (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a large pump station channel type forebay and a design method, and belongs to the technical field of hydraulic engineering pump stations. The method is characterized in that: a water diversion channel, a transition section, a forebay and a water inlet flow channel are sequentially arranged on the water inlet side of the large pump station along the water flow direction; the forebay is divided into a forebay diffusion section and a forebay adjustment section; the number of the overflow channels equal to the number of the water pumps in the pump station forebay is equal, each water pump corresponds to 1 overflow channel, and each overflow channel is separated by an overflow channel partition wall; arranging a trash remover bridge originally arranged in a front pool of a pump station on the upper part of a flow passage partition wall at an inlet of the front pool; providing a calculation formula of the plane control angle and the vertical plane control angle of the overflowing channel; a structural design scheme and a design method of a flow passage are provided. The invention can avoid the generation of transverse flow velocity in the forebay to cause the flow separation and vortex and other harmful flow states under the conditions that the pump station and the sluice are arranged in parallel, the forebay with large plane diffusion angle and the unit are started asymmetrically, and the like, and provides necessary water inlet conditions for the safe and stable operation of the pump station.

Description

Channel type forebay of large-scale pump station and design method
Technical Field
The invention belongs to the technical field of hydraulic engineering pump stations, and particularly relates to a channel type forebay of a large-scale pump station and a design method thereof, which can avoid the generation of transverse flow velocity in the forebay to cause the harmful flow states such as flow separation, vortex and the like under the conditions that the pump station and a sluice are arranged in parallel or a pump station unit is started asymmetrically and the like.
Background
Because the length of the large-scale pump station perpendicular to the water flow direction is obviously larger than the width of the river diversion, a forebay needs to be arranged between the large-scale pump station and the river diversion to realize smooth connection and provide necessary conditions for the uniform water inlet flow state of the inlet section of the water inlet runner. However, poor flow regimes such as defluidization and swirling often occur in the forebay under several conditions:
(1) in plain areas of China, pump station hubs combining irrigation and drainage are often required to be built, in order to save floor area and investment, a gate station combination scheme that a pump station and a check gate are arranged on a river channel in parallel is mostly adopted, and the center line of a front pool of the pump station is inconsistent with the center line of the river channel. When the pump station operates, water flow obliquely enters a front pool of the pump station from a river channel at a certain deflection angle, so that transverse flow velocity is generated in the front pool; under the action of transverse flow velocity, air suction vortex is easily generated in the forebay and the water pump vibration is caused.
(2) A plurality of water pump units are generally required to be arranged in parallel in a large-scale pump station, and a standby unit is also required to be arranged in some cases, so that the working condition of asymmetrical operation of the water pump units of the pump station often occurs according to different operation scheduling requirements; in this case too, transverse flow velocities are generated in the forebay and harmful suction vortices are induced.
(3) Some large-scale pump stations are limited by the site layout size, the length of the forebay along the water flow direction is small, so that the plane diffusion angle of the forebay is too large, and the water flow in the forebay generates harmful flow states such as vortex due to too fast diffusion.
If the stable operation of the water pump unit is seriously influenced by the problems of a certain large pump station, a model test method is generally adopted, the specific conditions of different pump stations are respectively researched, the flow state of the forebay is improved in a case of affairs by setting individualized engineering measures such as a bottom sill, an upright post and the like in the forebay, time, labor and cost are wasted, and the water inlet flow state can be improved only to a certain extent.
Disclosure of Invention
The invention aims to provide a channel type forebay of a large-scale pump station and a design method aiming at the existing problems so as to thoroughly solve the problem of harmful flow state of the 3 typical forebays. The invention is characterized in that: for large pump stations which are likely to generate unfavorable flow states such as flow separation, vortex and the like, overflow channels with the number equal to that of the water pumps are arranged in a front pool of the pump station, each water pump corresponds to 1 overflow channel, and the overflow channels are separated by overflow channel partition walls; arranging a trash remover bridge originally arranged in a front pool of a pump station on the upper part of a flow passage partition wall at an inlet of the front pool; providing a calculation formula of the plane control angle and the vertical plane control angle of the overflowing channel; a structural design scheme and a design method of a flow passage are provided. The channel-type forebay of the large-scale pump station provided by the invention completely avoids unfavorable flow states such as flow separation and vortex caused by transverse flow velocity generated in the forebay, and can ensure that the water inlet flow state of various large-scale pump stations which possibly generate unfavorable flow states such as flow separation and vortex meets the requirements of stable and efficient operation.
In order to realize the purpose of the invention, the following technical scheme is adopted:
1. the invention aims to provide a channel type forebay of a large pump station, which is characterized in that a water diversion channel, a transition section, the forebay and a water inlet flow channel are sequentially arranged on the water inlet side of the large pump station along the water flow direction; the cross section of the water diversion channel is in an inverted trapezoid shape, the cross section of the forebay is in a rectangular shape, the transition section is used for smoothly connecting the water diversion channel and the forebay, and the transition section is in an arc shape or a twisted surface wing wall;
the forebay is divided into a forebay diffusion section and a forebay adjustment section; the front pool diffusion section is positioned behind the transition section, and the plane and the vertical surface of the front pool diffusion section are in a linear diffusion shape; the forebay adjusting section is positioned between the forebay diffusing section and the water inlet flow channel, the section of the forebay adjusting section is rectangular, and the forebay adjusting section does not diffuse in the vertical and plane directions and is used for adjusting the water flow of the forebay diffusing section to directly enter the water inlet flow channel;
set up n-1 in large-scale pump station forebay and overflow passageway partition wall, n is the pump station's water pump set's number, separates conventional forebay that has the broad water face for n and overflows the passageway, and every overflows the passageway and corresponds to 1 water pump set, its purpose: each water pump unit is provided with a relatively independent overflowing channel, so that any possible transverse flow velocity and harmful vortexes caused by the transverse flow velocity which are easily generated due to the wide water surface of the conventional forebay are thoroughly avoided; meanwhile, the flow passage also has a good rectifying effect and can provide a straight and uniform water inlet flow state for the water inlet flow passage; the flow-through channels are numbered as 1,2,3, … … and n in sequence;
planar control angle theta of flow passageTongping tabletMaximum value of (max { theta) }Tongping IIs less than 16 degrees, and the vertical surface control angle theta of the flow passageTongli (a Chinese character)Maximum value of (max { theta) }Tongli iLess than 14 °, i ═ 1,2,3, …, n;
arranging a trash remover bridge at the inlet of the front pond, aligning the bridge piers of the trash remover bridge with the flow passage partition wall one by one, and enabling the height of the bridge piers of the trash remover bridge to be 0.25B higher than the flow passage partition wallGo into，BGo intoIs the width of the cross section of the inlet of the flow passage.
Furthermore, a cover plate is arranged at the top of the flow passage partition wall, and greening is carried out by utilizing the upper part of the cover plate.
Further, the main geometric parameters of the overflow channel of the forebay are as follows:
1) width B of front pool diffusion section inlet sectionIs expanded intoWidth B of water channel bottomBottom guideEqual; width B of outlet section of front pool diffusion sectionIs expanded out＝nBFlow passage+(n-1)BPartition pier，BFlow passageIs the width of the inlet section of the water inlet runner, BPartition pierThe thickness of the partition pier is shown.
2) The front end of the overflow channel partition wall is arc-shaped and is positioned at the inlet of the front pool diffusion section, and the tail end of the overflow channel partition wall is smoothly connected with a partition pier at the inlet of the water inlet runner; the overflow channel partition wall is cast by concrete, the bottom of the overflow channel partition wall is attached to the forebay bottom plate, and the top of the overflow channel partition wall is flush with the highest water level of the forebay.
3) The thickness of the front end of the flow passage partition wall is BIn front of wallThe thickness of the flow passage partition wall gradually becomes thicker from the front end to the tail end thereof, and the thickness B of the tail end of the flow passage partition wallWall tail＝BPartition pier(ii) a Width of cross-section of inlet of flow passage
Figure GDA0002808761750000031
4) Width B of flow passage forebay adjusting sectionFront toneWidth B of inlet cross section of water inlet channelFlow passageSame, the length L of the overflow channel forebay adjusting sectionFront tone＝1.5BGo into。
5) The overflowing passage partition wall is provided with a pressure balancing hole to balance the pressure on two sides of the overflowing passage partition wall.
6) And asymmetrical waist-shaped cross-section cross beams are arranged between the front pool side wall and the overflowing channel partition wall and between the adjacent overflowing channel partition walls.
2. The second purpose of the invention is to provide a method for designing a channel type forebay of a large-scale pump station, which is characterized by comprising the following steps:
1) a water diversion channel, a transition section, a forebay and a water inlet flow channel are sequentially arranged on the water inlet side of the large pump station along the water flow direction; the cross section of the water diversion channel is in an inverted trapezoid shape, the cross section of the forebay is in a rectangular shape, the transition section is used for smoothly connecting the water diversion channel and the forebay, and the transition section is in an arc shape or a twisted surface wing wall;
2) the forebay is divided into a forebay diffusion section and a forebay adjustment section; the front pool diffusion section is positioned behind the transition section, and the plane and the vertical surface of the front pool diffusion section are in a linear diffusion shape; the forebay adjusting section is positioned between the forebay diffusing section and the water inlet flow channel, the section of the forebay adjusting section is rectangular, and the forebay adjusting section does not diffuse in the vertical and plane directions and is used for adjusting the water flow of the forebay diffusing section to directly enter the water inlet flow channel;
3) separate the conventional forebay that has the broad water face of large-scale pump station for n and overflow the passageway, n is the pump set's of pump station the number, and every overflows the passageway and corresponds to 1 pump set, its purpose: each water pump unit is provided with a relatively independent overflowing channel, so that any possible transverse flow velocity and harmful vortexes caused by the transverse flow velocity which are easily generated due to the wide water surface of the conventional forebay are thoroughly avoided; meanwhile, the flow passage also has a good rectifying effect and can provide a straight and uniform water inlet flow state for the water inlet flow passage; the flow-through channels are numbered as 1,2,3, … … and n in sequence;
4) the overflow channel of the forebay is designed according to the following steps:
(1) calculating the width B of the inlet section of the front pool diffusion sectionIs expanded intoAnd outlet section width BIs expanded out: width B of front pool diffusion section inlet sectionIs expanded intoEqual to the width B of the bottom of the diversion canalBottom guideWidth B of outlet section of front pool diffusion sectionIs expanded outThe number n of the water pump units and the width B of the inlet section of the water inlet runnerFlow passageThickness of the hard wallPartition pierDetermining, calculating as：
BIs expanded out＝nBFlow passage+(n-1)BPartition pier (1)
(2) The front end of the overflow channel partition wall is arc-shaped and is positioned at the inlet of the front pool diffusion section, and the tail end of the overflow channel partition wall is smoothly connected with a partition pier at the inlet of the water inlet runner; the overflow channel partition wall is cast by concrete, the bottom of the overflow channel partition wall is attached to the forebay bottom plate, and the top of the overflow channel partition wall
Figure GDA0002808761750000051
Slightly higher than the highest water level of the forebay;
(3) the thickness of the front end of the flow passage partition wall is BIn front of wallThe thickness of the flow passage partition wall gradually becomes thicker from the front end to the tail end thereof, and the thickness B of the tail end of the flow passage partition wallWall tail＝BPartition pier；
According to the number n of the water pump units and the width B of the inlet section of the front pool diffusion sectionIs expanded intoAnd the thickness B of the front end of the flow passage partition wallIn front of wallDetermining the width B of the cross-section of the inlet of the flow channelGo into：
Figure GDA0002808761750000052
(4) Calculating the width B of the front pool adjusting section of the overflow channelFront toneAnd length LFront tone: width B of flow passage forebay adjusting sectionFront toneWidth B of inlet cross section of water inlet channelFlow passageThe length L of the overflow channel forebay adjusting section is the same according to the requirement of flow rectification of the water flow flowing out from the forebay diffusing sectionFront tone＝1.5BGo into；
(5) Pressure balancing holes are formed in the overflowing channel partition wall to balance the pressure on two sides of the overflowing channel partition wall; bottom elevation of the balance hole
Figure GDA0002808761750000053
Lower water level than the front pool
Figure GDA0002808761750000054
Low 0.15BGo intoThe section of the balance hole is in a shape of a long and thin rectangle, and the width B of the balance holeHole(s)＝0.05BGo intoHeight H of balance holeHole(s)＝0.4BGo into(ii) a In order to avoid the influence of water flow passing through the balance holes on the inlet flow state of the water inlet runner, the balance holes are arranged in the front half section of the front pool diffusion section and are uniformly distributed in 4 along the water flow direction;
(6) for strengthening the stability of the whole structure of the overflowing channel partition wall and simultaneously helping to eliminate water surface vortexes, cross beams are arranged between the front pool side wall and the overflowing channel partition wall and between the adjacent overflowing channel partition walls, and the distance between the cross beams in the height direction is smaller than 1.5BGo intoThe distance between the beams in the length direction is less than 2BGo into(ii) a The span of the cross beam is the same as the width of the flow passage at the position, and the height H of the cross section of the cross beamCross beam＝0.05BGo intoWidth BCross beam＝0.15BGo intoIn order to reduce the disturbance to the water inflow state and facilitate construction, the cross section of the beam is in an asymmetrical waist shape, and the radius R of the arc at the head of the cross section of the beam isHorizontal head＝0.025BGo intoRadius of arc at tail of cross beam sectionHorizontal tail＝0.0125BGo intoDistance L between the center of the arc at the head of the cross section of the beam and the center of the arc at the tail of the cross section of the beamCenter of circle＝0.1125BGo into；
5) According to the numerical simulation research result, a control index-a flow passage plane control angle theta for testing whether the plane direction of the overflow passage of the forebay possibly generates vortex is introducedTongping tablet；
Each flow passage plane control angle thetaTongping IIs calculated as follows:
Figure GDA0002808761750000061
in the formula, YJi1、YJi2Respectively showing the distance, YC, of the left side and the right side of the inlet section of the ith flow passage from the center line of the forebay planei1、YCi2The distances from the left side and the right side of the outlet section of the ith overflowing channel to the center line of the forepool plane are respectively shown, and i is 1,2,3, …, n; l isFront expansionIs the length of the front pool diffusion section;
YJi1、YJi2the calculation formula of (a) is respectively:
Figure GDA0002808761750000062
Figure GDA0002808761750000063
YCi1、YCi2the calculation formula of (a) is respectively:
Figure GDA0002808761750000064
Figure GDA0002808761750000065
in order to enable water flow to be diffused smoothly in the plane direction in the flow passage and prevent the generation of vortex in the plane direction, the numerical simulation research result of a CFD flow field is carried out according to a forebay and a water inlet flow channel, and the plane control angle theta of the flow passageTongping tabletMust be less than 16 °;
calculating the plane control angle theta of each flow passage one by oneTongping I(i ═ 1,2,3, …, n), inspection of flow channel plane control angle θTongping tabletWhether max { theta ] is satisfiedTongping IThe requirement of < 16 degrees; if not, the length L of the front pool diffusion section needs to be increased appropriatelyFront expansionUp to the plane control angle thetaTongping IThe requirements are met;
6) according to the numerical simulation research result, a control index-a flow passage vertical face control angle theta for testing whether the vertical face direction of the flow passage of the forebay possibly generates vortex is introducedTongli (a Chinese character)；
Vertical control angle theta of each flow passageTongli iIs calculated as follows:
Figure GDA0002808761750000071
in the formula (I), the compound is shown in the specification,
Figure GDA0002808761750000072
respectively representing the bottom elevations of an inlet section and an outlet section of the diffusion section of the ith flow passage, wherein i is 1,2,3, …, n;
in order to enable water flow to be diffused smoothly in the vertical surface direction in the flow passage and prevent the generation of vortexes in the vertical surface direction, a CFD flow field numerical simulation research result is carried out according to a forebay and a water inlet flow channel, and the vertical surface control angle theta of the flow passageTongli (a Chinese character)Must be less than 14 °;
calculating the vertical control angle theta of each flow passage one by oneTongli i(i ═ 1,2,3, …, n), check flow channel elevation control angle θTongli (a Chinese character)Whether max { theta ] is satisfiedTongli iThe requirement of < 14 degrees; if not, the length L of the front pool diffusion section needs to be increased appropriatelyFront expansionUp to the control angle theta of the vertical planeTongli iThe requirements are met;
7) the trash remover bridge is inconvenient to arrange in the front pool under the influence of the overflowing channel, and therefore the trash remover bridge is arranged at the inlet of the front pool, the bridge piers of the trash remover bridge are aligned with the overflowing channel partition wall one by one, and the bridge piers of the trash remover bridge are higher than the overflowing channel partition wall by 0.25BGo intoSo as to facilitate the arrangement of the trash cleaning machine and the removal of the dirt;
furthermore, a cover plate can be arranged on the top of the flow passage partition wall, and the upper part of the cover plate is utilized for greening, so that the environment is beautified.
Compared with the prior art, the method has the following beneficial effects:
first, the channel forebay that provides is applicable to the pump floodgate pivot of various arrangement forms, can properly solve because of pump station forebay central line and the leading river central line inconsistent and lead to producing the horizontal velocity in the forebay, arouse the problem of harmful swirl.
Secondly, the provided channel type forebay is suitable for a large-scale pump station with an overlarge plane diffusion angle of the forebay due to the limitation of site layout conditions, and can effectively reduce the plane diffusion angle and eliminate the harmful flow states such as flow shedding, vortex and the like caused by the overlarge water flow diffusion of the forebay under the condition of not increasing the length of the forebay.
And thirdly, the provided channel type forebay is suitable for a large pump station provided with a plurality of units, and can thoroughly eliminate transverse flow velocity caused by various asymmetrical starting working conditions and harmful vortexes caused by the transverse flow velocity.
Fourthly, the channel type forebay provided by the invention needs little investment, but has obvious effect, can effectively solve the problem of harmful flow state caused by the generation of transverse flow velocity in forebays of various large pump stations, and provides necessary water inlet conditions for the safe and stable operation of the large pump stations.
Drawings
FIG. 1(a) is a schematic plan view of a channeled forebay of the present invention;
FIG. 1(b) is a schematic diagram of the elevational layout of the channeled forebay of the present invention;
FIG. 2(a) is a schematic plan view of a channel-type forebay dimensional parameter of the present invention;
FIG. 2(b) is a schematic elevational view of the channel-type forebay dimensional parameter of the present invention;
FIG. 3 is a cross-sectional shape schematic of the beam of the present invention;
FIG. 4(a) is a floor plan of a forebay in accordance with an embodiment of the present invention;
FIG. 4(b) is a floor plan of a forebay in accordance with an embodiment of the present invention;
FIG. 5(a) is a floor plan of a channeled forebay in accordance with an embodiment of the present invention;
FIG. 5(b) is a floor plan of a channeled forebay in accordance with an embodiment of the present invention;
FIG. 6(a) is a plan view of a cover plate disposed on the top of a channel-type forebay in accordance with an embodiment of the present invention;
FIG. 6(b) is a vertical layout view of a cover plate disposed on the top of a channel-type forebay in accordance with an embodiment of the present invention;
in the figure: the water diversion channel comprises a water diversion channel 1, a transition section 2, a forebay 30, a forebay diffusing section 31, a forebay adjusting section 32, a forebay side wall 33, a water inlet flow channel 4, a flow passage partition wall 50, a flow passage partition wall 51, a flow passage partition wall front end 52, a flow passage partition wall tail end 52, a flow passage 6, a partition pier 7, a balance hole 8, a cross beam 90, a cross beam section head 91, a cross beam section tail part 92, a trash remover bridge 10, a pier 11 and a cover plate 12.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The channel type forebay of the large-scale pump station and the design method adopt the following technical scheme:
1. a water diversion channel 1, a transition section 2, a forebay 3 and a water inlet flow passage 4 are sequentially arranged on the water inlet side of the pump station along the water flow direction; the cross section of the water diversion channel 1 is in an inverted trapezoid shape, the cross section of the forebay 3 is in a rectangular shape, the transition section 2 is used for connecting the water diversion channel 1 and the forebay 3, and the transition section 2 is in an arc shape or a twisted surface wing wall, as shown in fig. 1(a) and 1 (b);
2. the forebay 3 is divided into a forebay diffuser section 31 and a forebay adjustment section 32; the front pool diffusion section 31 is positioned behind the transition section 2, and the plane and the vertical surface of the front pool diffusion section 31 are in a diffusion shape; the forebay adjusting section 32 is located between the forebay diffusing section 31 and the water inlet channel 4, and both the vertical surface and the plane of the forebay adjusting section 32 do not diffuse, so as to adjust the water flow of the forebay diffusing section 31 to enter the water inlet channel 4, as shown in fig. 1(a) and 1 (b);
3. as shown in fig. 1(a), the conventional open-water front pool 30 of a large pumping station is divided into n overflow channels 6, n is the number of water pump sets of the pumping station, and each overflow channel 6 corresponds to 1 water pump set, and the purpose is as follows: each water pump unit is provided with a relatively independent overflow channel 6, so that any possible transverse flow rate and harmful vortexes caused by the transverse flow rate which are easily generated due to the wide water surface of the conventional forebay are thoroughly avoided; meanwhile, the flow passage 6 also has good rectification function and can provide more ideal water inlet flow state for the water inlet flow passage 4; when viewed along the flowing direction of the water flow, the flow passage 6 is numbered as 1,2,3, … … and n from the left side to the right side in sequence;
4. the overflow channel 6 of the forebay 30 is designed as follows:
(1) calculating the inlet section width B of the front pool diffuser section 31Is expanded intoAnd outlet section width BIs expanded outWidth B of the inlet cross-section of the front pool diffuser section 31Is expanded intoEqual to the bottom width B of the water diversion canal 1Bottom guideFront pool diffuser31 outlet cross-sectional width BIs expanded outThe number n of the water pump units and the width B of the inlet section of the water inlet flow passage 4Flow passageAnd thickness B of the hard shoulder 7Partition pierAnd determining the calculation formula as follows:
Bis expanded out＝nBFlow passage+(n-1)BPartition pier (1)
(2) The front end 51 of the overflow channel partition wall is arc-shaped and is positioned at the inlet of the front pool diffusion section 31, and the tail end 52 of the overflow channel partition wall is smoothly connected with the partition pier 7 at the inlet of the water inlet runner 4; the overflowing channel partition wall 50 is cast by concrete, the bottom of the overflowing channel partition wall 50 is attached to and connected with the bottom plate of the front pool 30, and the top of the overflowing channel partition wall 50
Figure GDA0002808761750000101
Slightly higher than the highest water level of the forebay
Figure GDA0002808761750000102
As shown in fig. 1(a) and 1 (b);
(3) as shown in FIGS. 2(a) and 2(B), the thickness of the front end 51 of the flow channel partition wall is BIn front of wallThe thickness of the flow passage partition wall 50 gradually becomes thicker from the front end 51 of the flow passage partition wall to the tail end 52 of the flow passage partition wall, and the thickness B of the tail end 52 of the flow passage partition wallWall tail＝BPartition pier；
According to the number n of the water pump units and the width B of the inlet section of the front pool diffusion section 31Is expanded intoAnd the thickness B of the front end 51 of the flow channel partition wallIn front of wallDetermining the width B of the cross-section of the inlet of the flow channel 6Go into：
Figure GDA0002808761750000103
(4) Calculating the width B of the front pool adjustment segment 32 of the overflow channel 6Front toneAnd length LFront tone: width B of the front pool adjustment section 31 of the overflow channel 6Front toneWidth B of inlet cross section of water inlet channel 4Flow passageSimilarly, the length L of the forebay trim section 32 of the flow channel 6 is such that it rectifies the flow of water exiting from the forebay diffuser section 31Front tone＝1.5BGo intoAs shown in fig. 2(a) and 2 (b);
(5) as shown in fig. 1(b) and 2(b), pressure balance holes 8 are formed in the transfer passage partition walls 50 to balance the pressure on both sides of the transfer passage partition walls 50; bottom elevation of the balance hole 8
Figure GDA0002808761750000104
Lower water level than the front pool
Figure GDA0002808761750000105
Low 0.15BGo intoThe cross section of the balance hole 8 is in the shape of a slender rectangle, and the width B of the balance hole 8Hole(s)＝0.05BGo intoHeight H of balancing hole 8Hole(s)＝0.4BGo into(ii) a In order to avoid the influence of water flow passing through the balance holes 8 on the inlet flow state of the water inlet runner 4, the balance holes 8 are arranged in the front half section of the front pool diffusion section 31 and are uniformly distributed 4 along the water flow direction;
(6) in order to enhance the stability of the overall structure of the transfer passage partition walls 50 and also to help eliminate water surface vortexes, cross members are provided between the front pool side wall 33 and the transfer passage partition walls 50 and between adjacent transfer passage partition walls 50, as shown in fig. 1(a) and 1 (b); the height direction cross beams 90 are arranged at a pitch of less than 1.5BGo intoThe distance between the longitudinal beams 90 is less than 2BGo into(ii) a The span of the cross beam 90 is the same as the width of the flow passage 6 at the position, and the height H of the cross section of the cross beam 90Cross beam＝0.05BGo intoWidth BCross beam＝0.15BGo intoIn order to reduce the disturbance to the water inflow state and facilitate construction, the cross section of the beam 90 is shaped like an asymmetric kidney, and the arc radius R of the head 91 of the cross section of the beamHorizontal headIs 0.025BGo intoArc radius R of cross beam section tail 92Horizontal tailIs 0.0125BGo intoDistance L between the center of arc of head 91 of cross beam section and the center of arc of tail 92 of cross beam sectionCenter of circleIs 0.1125BGo intoAs shown in fig. 3;
5. according to the numerical simulation research result, a control index, namely a control angle theta of the plane of the overflow channel 6, for detecting whether the plane direction of the overflow channel 6 of the forebay possibly generates vortex is introducedTongping tablet；
Planar control angle theta of each flow passage 6Tongping tabletIs calculated as follows:
Figure GDA0002808761750000111
in the formula, YJi1、YJi2Respectively showing the distances YC between the left side and the right side of the inlet section of the ith flow channel 6 and the center line of the forebay planei1、YCi2The distances from the left side and the right side of the outlet section of the ith flow channel 6 to the center line of the forebay plane are respectively shown, and i is 1,2,3, …, n; l isFront expansionThe length of the front pool diffuser section 31;
YJi1、YJi2the calculation formula of (a) is respectively:
Figure GDA0002808761750000112
Figure GDA0002808761750000113
YCi1、YCi2the calculation formula of (a) is respectively:
Figure GDA0002808761750000114
Figure GDA0002808761750000115
in order to enable the water flow to be diffused smoothly in the plane direction in the flow passage 6 and prevent the generation of vortex in the plane direction, the numerical simulation research result of the CFD flow field is carried out according to the forebay and the water inlet flow channel, and the plane control angle theta of the flow passage 6Tongping tabletMust be less than 16 °;
calculating the plane control angle theta of each flow passage 6 one by oneTongping I(i ═ 1,2,3, …, n), the plane of the flow channel 6 was examinedControl angle thetaTongping tabletWhether max { theta ] is satisfiedTongping IThe requirement of < 16 degrees; if not, the length L of the front pool diffuser 31 needs to be increased appropriatelyFront expansionUp to the plane control angle thetaTongping IThe requirements are met;
6. according to the numerical simulation research result, a control index, namely a control angle theta of the vertical surface of the overflow channel 6, for testing whether the vertical surface direction of the overflow channel 6 of the forebay possibly generates vortex is introducedTongli (a Chinese character)；
Vertical control angle theta of each flow passage 6Tongli (a Chinese character)Is calculated as follows:
Figure GDA0002808761750000121
in the formula (I), the compound is shown in the specification,
Figure GDA0002808761750000122
respectively representing the bottom elevations of the inlet section and the outlet section of the diffusion section of the ith flow channel 6, wherein i is 1,2,3, …, n;
in order to enable water flow to be diffused smoothly in the vertical surface direction in the flow passage 6 and prevent the generation of vertical surface direction vortex, a CFD flow field numerical simulation research result is carried out according to a forebay and a water inlet flow channel, and the vertical surface control angle theta of the flow passage 6Tongli (a Chinese character)Must be less than 14 °;
the vertical surface control angle theta of each flow passage 6 is calculated one by oneTongli i(i ═ 1,2,3, …, n), the elevation control angle θ of the flow channel 6 was checkedTongli (a Chinese character)Whether max { theta ] is satisfiedTongli iThe requirement of < 14 degrees; if not, the length L of the front pool diffuser 31 needs to be increased appropriatelyFront expansionUp to the control angle theta of the vertical planeTongli iThe requirements are met; (ii) a
7. As shown in FIG. 1(B), the cleaner bridge 10 is disposed at the inlet of the forebay 30 with the abutments 11 of the cleaner bridge 10 aligned one by one with the transfer passage partition 50, but the height of the abutments 11 of the cleaner bridge 10 is higher than the top of the transfer passage partition 50 by 0.25BGo intoSo as to facilitate the arrangement of the trash cleaning machine and the removal of the dirt;
8. further, a cover plate 12 may be provided on the top of the flow passage partition wall 50, and greening may be performed using the upper portion of the cover plate 12 to beautify the environment.
Examples
As shown in fig. 4(a) and 4(B), a certain large-scale pump station is built in a suburb of a city, a vertical axial flow pump unit 5 sleeve is adopted, a water inlet channel 4 is an elbow-shaped water inlet channel, the width of the inlet section of the water inlet channel 4 is 7.7m, the thickness of a unit interval pier 7 is 1.5m, the thickness of a pump station side pier is 2.5m, the thickness of a forebay side wall 33 is 2m, and the width B of the bottom of a diversion channel 1 isBottom guide16m, and the length of the forebay 30 limited by the site is 30 m; bottom elevation B of water diversion channel 1Bottom guide10m, the bottom elevation of the inlet cross section of the water inlet channel 4 is 5.2m, and the front lowest water level
Figure GDA0002808761750000131
Is 13.5m and the highest water level of the forebay
Figure GDA0002808761750000132
It was 17.9 m. The vertical surface diffusion angle and the plane diffusion angle of the front pool of the large pump station are respectively 9 degrees and 51 degrees, so that the water flow in the front pool 30 can easily generate a large-range backflow vortex in the plane direction to influence the stable operation of the pump station, and the hydraulic design of the channel type front pool of the large pump station is carried out by adopting the invention.
The method for carrying out channel type forebay hydraulic design on the large pump station comprises the following steps:
1. a water diversion channel 1, a transition section 2, a forebay 30 and a water inlet flow channel 4 are sequentially arranged on the water inlet side of the pump station along the water flow direction, wherein the transition section 2 is an arc-shaped wing wall, as shown in fig. 5(a) and 5 (b);
2. the front pool 30 is divided into a front pool diffusing section 31 and a front pool adjusting section 32; the front pool diffusion section 31 is positioned behind the transition section 2, and the plane and the vertical surface of the front pool diffusion section 31 are in a linear diffusion shape; the forebay adjusting section 32 is positioned between the forebay diffusing section 31 and the water inlet runner 4, the section of the forebay adjusting section 32 is rectangular, and the forebay adjusting section does not diffuse in the vertical and plane directions, as shown in fig. 5(a) and 5 (b);
3. as shown in fig. 5(a), the conventional open-water front pool 30 of the large-scale pump station is divided into 6 overflow channels 6, each overflow channel 6 corresponds to 1 water pump unit, and the overflow channels 6 are numbered as 1,2,3, 4 and 5 in sequence from left side to right side when viewed along the flow direction of water flow;
4. the overflow channel 6 of the forebay 30 is designed as follows:
(1) calculating the inlet section width B of the front pool diffuser section 31Is expanded intoAnd outlet section width BIs expanded out(ii) a The width B of the inlet cross section of the front pool diffuser section 31Is expanded intoEqual to the bottom width B of the water diversion canal 1Bottom guide，BIs expanded into16 m; according to the formula (1), the number n of water pump units is 5, and the width B of the inlet section of the water inlet channel 4Flow passageAnd thickness B of the hard shoulder 7Partition pierCalculating the outlet section width B of the front pool diffuser section 31Is expanded out：
BIs expanded out＝nBFlow passage+(n-1)BPartition pier＝5×7.7+(5-1)×1.5＝44.5m
(2) The front end 51 of the overflowing channel partition wall 50 is arc-shaped and is positioned at the inlet of the front pool diffusion section 31, and the tail end 52 of the overflowing channel partition wall 50 is smoothly connected with the partition pier 7 at the inlet of the water inlet channel 4, as shown in fig. 5 (a); the overflowing channel partition wall 50 is poured by concrete, the bottom of the overflowing channel partition wall 50 is attached to and connected with the bottom plate of the front pool 30, and the top elevation of the overflowing channel partition wall 50
Figure GDA0002808761750000141
Higher than the highest water level of the forebay
Figure GDA0002808761750000142
Top elevation of flow channel partition 50
Figure GDA0002808761750000143
18m, as shown in FIG. 5 (b);
(3) as shown in FIG. 5(a), the thickness of the front end 51 of the flow channel partition wall is BIn front of wallThe thickness of the flow channel partition wall 50 gradually becomes thicker from the front end 51 of the flow channel partition wall to the tail end 52 of the flow channel partition wall, and the thickness B of the tail end 52 of the flow channel partition wall is 0.5mWall tail＝BPartition pier＝1.5m；
According to the formula (2), fromThe number n of the water pump units is 5, and the width B of the inlet section of the forebay diffusion section 31Is expanded intoAnd the thickness B of the front end 51 of the flow channel partition wallIn front of wallCalculating the width B of the inlet section of the flow channel 6Go into：
Figure GDA0002808761750000144
(4) Calculating the width B of the front pool adjustment segment 32 of the overflow channel 6Front toneAnd length LFront tone(ii) a Width B of the front pool adjustment section 31 of the overflow channel 6Front toneWidth B of inlet cross section of water inlet channel 4Flow passageThe same is 7.7m, as shown in FIG. 5 (a); the length L of the forebay conditioning section 32 of the flow channel 6Front tone＝1.5BGo into1.5 × 2.8 ═ 4.2m, as shown in fig. 5 (b);
(5) as shown in FIG. 5(b), the pressure balance holes 8 are formed in the flow channel partition walls 50 such that the bottoms of the balance holes 8 have a high level
Figure GDA0002808761750000145
Lower water level than the front pool
Figure GDA0002808761750000146
Low 0.15BGo intoWidth B of balance hole 8 of 0.42mHole(s)＝0.05BGo intoHeight H of balance hole 8 of 0.14mHole(s)＝0.4BGo into1.12 m; the balance holes 8 are arranged in the front half section of the front pool diffusion section 31 and are uniformly distributed in 4 along the water flow direction;
(6) as shown in fig. 5(a) and 5(B), cross members 90 are provided between the front pool side wall 33 and the flow channel partition walls 50, and between the adjacent flow channel partition walls 50, and the height direction cross members 90 are arranged at intervals of less than 1.5BGo intoThe length-direction cross member 90 is arranged at a pitch of less than 2B, 4.2mGo into5.6 m; the span of the cross beam 90 is the same as the width of the flow passage 6 at the position, and the height H of the cross section of the cross beam 90Cross beam＝0.05BGo into0.14m, width BCross beam＝0.15BGo into0.42m, the cross section of the beam 90 is in an asymmetrical waist shape, and the head part of the cross section of the beamRadius of arc 91RHorizontal headIs 0.025BGo into0.07m, and 91 arc radius R of tail part of cross section of cross beamHorizontal tailIs 0.0125BGo intoThe distance between the center of the arc of the head 91 of the cross beam section and the center of the arc of the tail 92 of the cross beam section is 0.1125BGo into＝0.315m；
5. The distances between the left side of the inlet section of each flow passage 6 and the plane central line of the forebay 3 are respectively YJ calculated according to the formula (4)11＝8m、YJ21＝4.7m、YJ31＝1.4m、YJ41＝-1.9m、YJ51The distance between the right side of the inlet section of each flow passage 6 and the plane central line of the forebay 3 is YJ calculated according to the formula (5) which is 5.2m12＝5.2m、YJ22＝1.9m、YJ32＝-1.4m、YJ42＝-4.7m、YJ52＝-8m；
Calculating to obtain YC distances from the left side of the outlet section of each flow passage 6 to the plane central line of the forebay 3 according to a formula (6)11＝22.25m、YC21＝13.05m、YC31＝3.85m、YC41＝-5.35m、YJ51The distance from the right side of the outlet section of each flow passage 6 to the center line of the plane of the forebay 3 is YC calculated according to the formula (7) of-14.55 m12＝14.55m、YJ22＝5.35m、YJ32＝-3.85m、YJ42＝-13.05m、YJ52＝-22.25m；
Calculating according to the formula (3) to obtain the plane control angles theta of the flow channels 6Tongping 1＝9.0°、θTongping 2＝10.3°、θTongping 3＝10.8°、θTongping 410.3 ° and θTongping 59.0 DEG, the planar control angle theta of the flow channel 6Tongping tabletSatisfies max [ theta ]Tongping IThe requirement of < 16 degrees;
6. elevation at the bottom of the inlet of the front pool diffusion section 31 of the large-scale pump station
Figure GDA0002808761750000151
The elevation B of the bottom of the water diversion channel 1Bottom guideIn the same way, the first and second,
Figure GDA0002808761750000152
outlet bottom elevation of forebay diffuser 31
Figure GDA0002808761750000153
The bottom elevation of the inlet section of the water inlet flow passage 4 is the same,
Figure GDA0002808761750000154
as shown in fig. 5 (b); the length L of the forebay diffuser 31Front expansion＝30-4.2＝25.8m；
Calculating according to a formula (8) to obtain vertical surface control angles theta of the flow channels 6Tongli 1＝10.5°、θTongli 3＝10.5°、θTongli 4＝10.5°、θTongli 5＝10.5°、θTongli 610.5 DEG, vertical control angle theta of the flow passage 6Tongli (a Chinese character)Satisfies max [ theta ]Tongli iThe requirement of < 14 degrees;
7. as shown in fig. 5(B), the cleaner bridge 10 is disposed at the inlet of the forebay 30, the piers 11 of the cleaner bridge 10 are aligned with the flow passage partition walls 50 one by one, and the height of the piers 11 of the cleaner bridge 10 is 0.25B higher than the top of the flow passage partition walls 50Go into0.7m, so as to facilitate the arrangement of the trash remover and the removal of the dirt;
8. as shown in fig. 6(a) and 6(b), since the large pumping station is located in the suburban area, a cover plate 12 is provided on the top of the flow passage partition wall 50 according to the requirements of urban construction, and turf is planted on the upper portion of the cover plate 12 by covering soil.

Claims (2)

1. A large pump station channel type forebay is characterized in that a water diversion channel, a transition section, a forebay and a water inlet flow channel are sequentially arranged on the water inlet side of a large pump station along the water flow direction; the cross section of the water diversion channel is in an inverted trapezoid shape, the cross section of the forebay is in a rectangular shape, the transition section is used for smoothly connecting the water diversion channel and the forebay, and the transition section is in an arc shape or a twisted surface wing wall;
the forebay is divided into a forebay diffusion section and a forebay adjustment section; the front pool diffusion section is positioned behind the transition section, and the plane and the vertical surface of the front pool diffusion section are in a linear diffusion shape; the forebay adjusting section is positioned between the forebay diffusing section and the water inlet runner, and the section of the forebay adjusting section is rectangular;
arranging n-1 overflowing channel partition walls in a front pool of a large pump station, wherein n is the number of water pump units of the pump station, the front pool with the open water surface is divided into n overflowing channels, each overflowing channel corresponds to 1 water pump unit, and the overflowing channels are sequentially numbered as 1,2,3, … … and n;
planar control angle theta of flow passageTongping tabletMaximum value of (max { theta) }Tongping IIs less than 16 degrees, and the vertical surface control angle theta of the flow passageTongli (a Chinese character)Maximum value of (max { theta) }Tongli iLess than 14 °, i ═ 1,2,3, …, n;
arranging a trash remover bridge at the inlet of the front pond, aligning the bridge piers of the trash remover bridge with the flow passage partition wall one by one, and enabling the height of the bridge piers of the trash remover bridge to be 0.25B higher than the flow passage partition wallGo into，BGo intoThe width of the cross section of the inlet of the flow passage;
the geometrical parameters of the overflow channel of the forebay are as follows:
(1) width B of front pool diffusion section inlet sectionIs expanded intoWidth B of water channel bottomBottom guideEqual; width B of outlet section of front pool diffusion sectionIs expanded out＝nBFlow passage+(n-1)BPartition pier，BFlow passageIs the width of the inlet section of the water inlet runner, BPartition pierThe thickness of the partition pier is;
(2) the front end of the overflow channel partition wall is arc-shaped and is positioned at the inlet of the front pool diffusion section, and the tail end of the overflow channel partition wall is smoothly connected with a partition pier at the inlet of the water inlet runner; the overflow channel partition wall is poured by concrete, the bottom of the overflow channel partition wall is attached and connected with the front pool bottom plate, and the top of the overflow channel partition wall is flush with the highest water level of the front pool;
(3) the thickness of the front end of the flow passage partition wall is BIn front of wallThe thickness of the flow passage partition wall gradually becomes thicker from the front end to the tail end thereof, and the thickness B of the tail end of the flow passage partition wallWall tail＝BPartition pier(ii) a Width of cross-section of inlet of flow passage
Figure FDA0002808761740000021
(4) Width B of flow passage forebay adjusting sectionFront toneWidth B of inlet cross section of water inlet channelFlow passageSame, the length L of the overflow channel forebay adjusting sectionFront tone＝1.5BGo into；
(5) Pressure balancing holes are formed in the overflowing channel partition wall to balance the pressure on two sides of the overflowing channel partition wall;
(6) and asymmetrical waist-shaped cross-section cross beams are arranged between the front pool side wall and the overflowing channel partition wall and between the adjacent overflowing channel partition walls.
2. The method for designing the channel type forebay of the large-scale pump station is characterized by comprising the following steps:
(1) a water diversion channel, a transition section, a forebay and a water inlet flow channel are sequentially arranged on the water inlet side of the large pump station along the water flow direction; the cross section of the water diversion channel is in an inverted trapezoid shape, the cross section of the forebay is in a rectangular shape, the transition section is used for smoothly connecting the water diversion channel and the forebay, and the transition section is in an arc shape or a twisted surface wing wall;
(2) the forebay is divided into a forebay diffusion section and a forebay adjustment section; the front pool diffusion section is positioned behind the transition section, and the plane and the vertical surface of the front pool diffusion section are in a linear diffusion shape; the forebay adjusting section is positioned between the forebay diffusing section and the water inlet flow channel, the section of the forebay adjusting section is rectangular, and the forebay adjusting section does not diffuse in the vertical and plane directions and is used for adjusting the water flow of the forebay diffusing section to directly enter the water inlet flow channel;
(3) dividing a conventional front pool with a wide water surface of a large pump station into n overflowing channels, wherein n is the number of water pump units of the pump station, each overflowing channel corresponds to 1 water pump unit, and the overflowing channels are sequentially numbered as 1,2,3, … … and n;
(4) the overflow channel of the forebay is designed according to the following steps:
calculating the width B of the inlet section of the diffusion section of the forebayIs expanded intoAnd outlet section width BIs expanded out: width B of front pool diffusion section inlet sectionIs expanded intoEqual to the width B of the bottom of the diversion canalBottom guideWidth B of outlet section of front pool diffusion sectionIs expanded outThe number n of the water pump units and the width B of the inlet section of the water inlet runnerFlow passageThickness of the hard wallPartition pierDetermining and countingThe formula is as follows:
Bis expanded out＝nBFlow passage+(n-1)BPartition pier (1)
The front end of the overflow channel partition wall is arc-shaped and is positioned at the inlet of the diffusion section of the front pool, and the tail end of the overflow channel partition wall is smoothly connected with a partition pier at the inlet of the water inlet runner; the overflow channel partition wall is cast by concrete, the bottom of the overflow channel partition wall is attached to the forebay bottom plate, and the top of the overflow channel partition wall
Figure FDA0002808761740000031
Slightly higher than the highest water level of the forebay;
③ the thickness of the front end of the flow passage partition wall is BIn front of wallThe thickness of the flow passage partition wall gradually becomes thicker from the front end to the tail end thereof, and the thickness B of the tail end of the flow passage partition wallWall tail＝BPartition pier；
According to the number n of the water pump units and the width B of the inlet section of the front pool diffusion sectionIs expanded intoAnd the thickness B of the front end of the flow passage partition wallIn front of wallDetermining the width B of the cross-section of the inlet of the flow channelGo into：
Figure FDA0002808761740000032
Fourthly, calculating the width B of the adjustment section of the overflow channel forebayFront toneAnd length LFront tone: width B of flow passage forebay adjusting sectionFront toneWidth B of inlet cross section of water inlet channelFlow passageSame, the length L of the overflow channel forebay adjusting sectionFront tone＝1.5BGo into；
Fifthly, opening pressure balance holes on the partition wall of the flow passage, wherein the bottom of each balance hole is high
Figure FDA0002808761740000033
Lower water level than the front pool
Figure FDA0002808761740000034
Low 0.15BGo intoBalance hole breakThe surface is in the shape of a slender rectangle, and the width B of the balance holeHole(s)＝0.05BGo intoHeight H of balance holeHole(s)＝0.4BGo into(ii) a The balance holes are arranged in the front half section of the front pool diffusion section and are uniformly distributed in 4 along the water flow direction;
setting crossbeams between the front pool side wall and the flow passage partition wall and between the adjacent flow passage partition walls, wherein the distance between the crossbeams in the height direction is less than 1.5BGo intoThe distance between the beams in the length direction is less than 2BGo into(ii) a The span of the cross beam is the same as the width of the flow passage at the position, and the height H of the cross section of the cross beamCross beam＝0.05BGo intoWidth BCross beam＝0.15BGo intoThe cross section of the beam is in an asymmetrical waist shape, and the radius R of the arc at the head of the cross section of the beamHorizontal head＝0.025BGo intoRadius of arc at tail of cross beam sectionHorizontal tail＝0.0125BGo intoDistance L between the center of the arc at the head of the cross section of the beam and the center of the arc at the tail of the cross section of the beamCenter of circle＝0.1125BGo into；
(5) Calculating the planar control angle theta of each flow passage one by oneTongping I1,2,3, …, n, calculated as:
Figure FDA0002808761740000041
in the formula, YJi1、YJi2Respectively showing the distance, YC, of the left side and the right side of the inlet section of the ith flow passage from the center line of the forebay planei1、YCi2The distances from the left side and the right side of the outlet section of the ith overflowing channel to the center line of the forepool plane are respectively shown, and i is 1,2,3, …, n; l isFront expansionIs the length of the front pool diffusion section;
YJi1、YJi2the calculation formula of (a) is respectively:
Figure FDA0002808761740000042
Figure FDA0002808761740000043
YCi1、YCi2the calculation formula of (a) is respectively:
Figure FDA0002808761740000044
Figure FDA0002808761740000045
inspection of flow channel planar control angle θTongping tabletWhether max { theta ] is satisfiedTongping IThe requirement that the angle is less than 16 degrees is met, if the angle is not met, the length L of the front pool diffusion section is properly increasedFront expansionUp to the plane control angle thetaTongping IThe requirements are met;
(6) calculating the vertical control angle theta of each flow passage one by oneTongli i1,2,3, …, n, calculated as follows:
Figure FDA0002808761740000046
in the formula (I), the compound is shown in the specification,
Figure FDA0002808761740000047
respectively representing the bottom elevations of an inlet section and an outlet section of the diffusion section of the ith flow passage, wherein i is 1,2,3, …, n;
checking the vertical control angle theta of the flow passageTongli (a Chinese character)Whether max { theta ] is satisfiedTongli iThe requirement that the angle is less than 14 degrees is met, if the angle is not met, the length L of the front pool diffusion section is properly increasedFront expansionUp to the control angle theta of the vertical planeTongli iThe requirements are met;
(7) arranging the trash remover bridge at the inlet of the front tank, aligning the bridge piers of the trash remover bridge with the flow passage partition wall one by one, wherein the height of the bridge piers of the trash remover bridge is 0.25B higher than that of the flow passage partition wallGo into。
CN202010434542.5A 2020-05-21 2020-05-21 Channel type forebay of large-scale pump station and design method Active CN111576324B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010434542.5A CN111576324B (en) 2020-05-21 2020-05-21 Channel type forebay of large-scale pump station and design method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010434542.5A CN111576324B (en) 2020-05-21 2020-05-21 Channel type forebay of large-scale pump station and design method

Publications (2)

Publication Number Publication Date
CN111576324A CN111576324A (en) 2020-08-25
CN111576324B true CN111576324B (en) 2021-02-09

Family

ID=72117623

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010434542.5A Active CN111576324B (en) 2020-05-21 2020-05-21 Channel type forebay of large-scale pump station and design method

Country Status (1)

Country Link
CN (1) CN111576324B (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8177500B2 (en) * 2008-10-03 2012-05-15 Xylem Ip Holdings Llc Intake device and a pump station
CN105604130B (en) * 2016-01-25 2017-05-24 扬州大学 Method for eliminating air-suction vortex at water inlet of pumping station under condition of beeline layout of gate and station
CN107558386B (en) * 2017-09-07 2018-11-30 河海大学 A method of improving City Pumping Station oblique inflow box culvert assignment of traffic uniformity

Also Published As

Publication number Publication date
CN111576324A (en) 2020-08-25

Similar Documents

Publication Publication Date Title
CN201778317U (en) Side inflow pump house diversion device
CN109406099B (en) Low-turbulence compact circulating water tunnel experimental device
CN107558386B (en) A method of improving City Pumping Station oblique inflow box culvert assignment of traffic uniformity
CN106759665B (en) Combined hydraulic rectifying device under ultralow water level of pump station water inlet pool
CN102949888B (en) Sedimentation basin for drip irrigating of water source containing sand and optimization method thereof
CN106930199B (en) Improve the fairing of arc Box-shaped Drainage Culvert water outlet fluidised form
CN109610355B (en) A kind of guarantee urban rainwater pumping plant expansion type water outlet box culvert goes out to flow uniform method
CN104805809B (en) The Forebay of Pumping Station type of falling π dam fluidised form improves devices and methods therefor
CN111576324B (en) Channel type forebay of large-scale pump station and design method
CN213329229U (en) Pump station combination rectification structure
CN104652350A (en) Open channel diffusion section flow-equalizing device and method for calculating placement position of open channel diffusion section flow-equalizing device
CN207348004U (en) Integration pump brake gear and gate pumping station system
CN212582868U (en) Pump station
CN109594533A (en) A kind of minor air cell&#39;s stilling pond
CN109778772B (en) Joint guiding device for improving flow state of water inlet pool of lateral water inlet pump station
CN110130471B (en) Wedge-shaped flow guiding pier for coping with large diffusion angle of front pool of pump station and research method thereof
CN115467296B (en) Valve adjusting guide wall and design method and operation method thereof
CN110185102B (en) Circular pump station catch basin provided with uniform water distribution device
CN109630466B (en) Deviation rectifying and vortex eliminating method for low-lift pump station water outlet flow passage and application thereof
CN203334419U (en) Pump station system
CN211057990U (en) Lead to qualified bars device of moisturizing pump station group
CN212375949U (en) Be applied to fairing of asymmetric arrangement floodgate station pump station forebay
CN109797715A (en) A method of optimization aqueduct diffuser hydraulic flow state
Li et al. Experimental study on flow pattern in forebay pump station and rectification scheme
CN114960558B (en) High dam under-water drainage device and under-water drainage method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant