CN104805797A - Device and method for improving flow pattern of inverted T-shaped dam of pump station front pond - Google Patents
Device and method for improving flow pattern of inverted T-shaped dam of pump station front pond Download PDFInfo
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- CN104805797A CN104805797A CN201510211288.1A CN201510211288A CN104805797A CN 104805797 A CN104805797 A CN 104805797A CN 201510211288 A CN201510211288 A CN 201510211288A CN 104805797 A CN104805797 A CN 104805797A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention relates to a device and a method for improving the flow pattern of an inverted T-shaped dam of a pump station front pond. The device comprises a front pond and a flow deflector arranged on the rear part of a return flow zone in the front pond, wherein the front part of the front pond is connected with an inlet culvert; an intake pond is arranged on the rear part of the front pond. The device is characterized in that the flow deflector is the inverted T-shaped dam; the inverted T-shaped dam is provided with an inverted T-shaped section vertical to the water flow direction; the distance between the inverted T-shaped dam and the intake pond is 0.2-0.4 time of the length of the front pond; the inverted T-shaped dam is formed by a lower dam and an upper dam; the upper dam is arranged in the middle of the upper part of the lower dam; the lower dam is in a cuboid shape; the length of the lower dam is equal to the width of the front pond; the width of the lower dam is 0.5 time of the water depth in the front pond; the height of the lower dam is 0.4 time of the water depth in the front pond; the upper dam is in a cuboid shape; the length of the upper dam is 0.1 time of the width of the front pond; the width of the upper dam is 0.5 time of the water depth in the front pond; the height of the upper dam is 0.4 time of the water depth in the front pond. Through the device and the method for improving the flow pattern of the inverted T-shaped dam of the pump station front pond provided by the invention, the problems of the flow pattern and the sedimentation existing in the pump station front pond are solved.
Description
Technical field
The present invention relates to a kind of Forebay of Pumping Station inverted T shape dam fluidised form improving device and method thereof, belong to Forebay of Pumping Station design field.
Background technology
Forebay is an important component part in pumping plant building, and can its form of structure is related to current be diffused into intake pool from channel of approach is smooth-going.Due to the impact of many factors, both sides, forebay are made often to there is recirculating zone.Often there is the backflow of large regions in forebay, the energy of water pump and cavitation performance are declined, time serious, even can cause pump cavitation and vibration, harm pumping plant safety.The existence simultaneously refluxed makes the flow rate of water flow at front pool side wall place be less than silt non-silting velocity, causes
recirculating zoneobvious Sediment Siltation, worsens flow condition further.
In forebay, concrete flow condition improvement countermeasures and principle thereof comprise as follows:
(1) the smooth-going current on the trend such as deflector, guide wall, airflow fence are established; The process that current flow through airflow fence is similar to blade lattice streaming, when current flow through them, due to the hydrodynamism that grizzly bar produces, react on water body, water body is tilted to inwall, thus counteract the some effects of inertia force, limit the diffusion effect of curve inner side water body, can effectively eliminate separation of flow district.The simultaneously measure such as airflow fence also can prevent the secondary back on section from structure, inhibit the helical flow in forebay.
(2) establish water squeezing plate to oppress flow and improve fluidised form; After intake pool establishes 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 and the mutual blending of surface current, the flow velocity along main flow direction is redistributed, and makes to obtain at intakes of pumping station place current of intaking more uniformly
(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 are separated in column downstream, and causing the plane whirlpool district of some strength, this district's water body and surrounding water constantly carry out momentum-exchange, and nearby Flow Field Distribution is even to make column downstream.
This kind of water conservancy diversion measure improves Forebay of Pumping Station water inlet velocity flow profile, eliminates large-area recirculating zone, but still has that some are obviously not enough, or is unfavorable for construction; Or because of baffle design improper, the separation of flow district after baffle easily produces Karman vortex street and enters pumping plant import, directly causes whirlpool to enter the pump housing, causes unit vibration.
Summary of the invention
The object of the invention is for the fluidised form existed in existing Forebay of Pumping Station and alluvial problem, a kind of Forebay of Pumping Station inverted T shape dam fluidised form improving device and method thereof are provided.
Technical scheme of the present invention is, a kind of Forebay of Pumping Station inverted T shape dam fluidised form improving device, comprise the baffle that in forebay and forebay, rear portion, recirculating zone is arranged, front portion, forebay (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 perpendicular to water (flow) direction, inverted T shape dam far from the distance of intake pool be the 0.2-0.4 of forebay length doubly, 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 dark 0.5 times of forebay pool inner water, and lower height of dam degree is dark 0.4 times of forebay pool inner water; Described upper dam is cuboid, and upper dam length degree is 0.1 times of forebay width, and upper dam width degree is dark 0.5 times of forebay pool inner water, and upper height of dam degree is dark 0.4 times of forebay pool inner water.
Described upper dam is wide 0.45 times in pond, forebay far from the distance of recirculating zone, forebay.
Xia Ba, the Shang Ba on described T-shaped dam are concrete component.
Described inverted T shape dam is 0.3 times of forebay length far from the distance of intake pool.
A kind of Forebay of Pumping Station inverted T shape dam fluidised form ameliorative way, comprise front portion, forebay (upstream) and connect inlet culvert, rear portion, forebay (downstream) arranges intake pool, it is characterized in that: in forebay, rear portion, recirculating zone arranges inverted T shape dam, inverted T shape dam is vertical with water (flow) direction, inverted T shape dam is inverted T-shaped at the section perpendicular to water (flow) direction, inverted T shape dam far from the distance of intake pool be the 0.2-0.4 of forebay length doubly; 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 is to stopping from the current before dam and shunting, and the flowing destroying these place's current is stablized, and strengthens the energy exchange of current in forebay further, improves the flow rate of water flow of side, large recirculating zone, forebay, reduces the Sediment Siltation of side, large recirculating zone; Lower dam utilizes vortex effect to the current that it passes through, and by blending current, strengthens the diffusion of turbulent fluctuation energy, water body momentum is redistributed, obtains 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 dark 0.5 times of forebay pool inner water, and lower height of dam degree is dark 0.4 times of forebay pool inner water; Described upper dam is cuboid, and upper dam length degree is 0.1 times of forebay width, and upper dam width degree is dark 0.5 times of forebay pool inner water, and upper height of dam degree is dark 0.4 times of forebay pool inner water.
Described upper dam is wide 0.45 times in pond, forebay far from the distance of recirculating zone.
Xia Ba, the Shang Ba on described T-shaped dam are concrete component, adopt prefabricated mode separately to build 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.
Described inverted T shape dam is 0.3 times of forebay length far from the distance of intake pool.
The present invention is rational in infrastructure, simple and science, is theoretical based on fluid mechanics principle, geometry of space and Design of Pump Station, to the innovation of fluidised form ameliorative way; Under described inverted T shape dam, dam utilizes vortex effect, by blending current, strengthens the diffusion of turbulent fluctuation energy, water body momentum is redistributed, obtains more uniform velocity flow profile behind the dam on inverted T shape dam; Dam on inverted T shape dam, stop and shunting action is had to current before dam, because upper dam is arranged on forebay, there is side, larger recirculating zone, the flowing destroying these place's current is stablized, further enhance the energy exchange of current in forebay, improve the flow rate of water flow of side, large recirculating zone, forebay simultaneously, namely improve the flow condition of Bian Bi side unit, have again and reduce this side and Sediment Siltation problem of causing too low due to flow velocity.
Along with construction, the enforcement of national large pumping station technological transformation and South-to-North Water Transfer Project, the Inlet flow pattern of up to a hundred pumping plants is had to need to improve altogether, therefore the application of this patent and enforcement, for the pumping plant that there is bad fluidised form in forebay, have significant fluidised form to improve effect.This will produce larger economic worth and social benefit.Estimate that the mode transferred the possession of is: 1) designing institute's design adopts; 2) engineered middle enforcement.
Accompanying drawing explanation
Fig. 1 is inverted T shape dam arrangement diagram.
Fig. 2 is without measure Forebay of Pumping Station fluidised form figure.
Fig. 3 inverted T shape dam fluidised form improves rear Forebay of Pumping Station fluidised form figure.
Fig. 4 pumping plant unit approach velocity distribution map (hopeless inverted T shape dam of granting compares).
In figure: dam on 1 inlet culvert, 2 forebays, 3 intake pools, 4 times dams, 5.
Detailed description of the invention
Illustrate that the invention will be further described below in conjunction with accompanying drawing and accompanying drawing.
Inverted T shape dam is set in intake front pool 2, inverted T shape dam far from position depending on fluidised form concrete in forebay, inverted T shape dam far from the distance of intake pool 3 can be the 0.2-0.4 of forebay 2 length doubly, suggestion inverted T shape dam is set to 0.3 times of forebay 2 length far from the distance of intake pool 3.
Connect inlet culvert 1 in front portion, forebay 2 (upstream), rear portion, forebay 2 (downstream) arranges intake pool 3, and in forebay 2, rear portion, recirculating zone arranges inverted T shape dam, and inverted T shape dam is vertical with water (flow) direction, and inverted T shape dam is inverted T-shaped at the section perpendicular to water (flow) direction; Inverted T shape dam far from position depending on fluidised form concrete in forebay, inverted T shape dam far from the distance of intake pool 3 can be the 0.2-0.4 of forebay 2 length doubly, suggestion inverted T shape dam is set to 0.3 times of forebay 2 length far from the distance of intake pool 3.
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 dark 0.5 times of forebay 2 pool inner water, and lower dam 4 is highly dark 0.4 times of forebay 2 pool inner water; Upper dam 5 is cuboid, and upper dam 5 length is 0.1 times of forebay 2 width, and upper dam 5 width is dark 0.5 times of forebay 2 pool inner water, and upper dam 5 is highly dark 0.4 times of forebay 2 pool inner water.
By the present invention, upper dam 5 is to stopping from the current before dam and shunting, and the flowing destroying these place's current is stablized, and strengthens the energy exchange of current in forebay 2 further, improves the flow rate of water flow of large side, recirculating zone, forebay 2, reduces the Sediment Siltation of side, large recirculating zone; Lower dam 4 utilizes vortex effect to the current that it passes through, and by blending current, strengthens the diffusion of turbulent fluctuation energy, water body momentum is redistributed, and obtains more uniform velocity flow profile and enters intake pool, improve pumping plant flow condition in the forebay 2 behind the dam on inverted T shape dam.
Further, upper dam 5 is wide 0.45 times in pond, forebay 2 apart from the distance of recirculating zone.In the present invention, lower dam 4, the upper dam 5 on T-shaped dam are concrete component, adopt prefabricated mode separately to build 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; Certain inverted T shape dam also can in cast-in-place mode.
Claims (8)
1. a Forebay of Pumping Station inverted T shape dam fluidised form improving device, comprise the baffle of forebay (2) and the setting of rear portion, forebay (2) interior recirculating zone, front portion, forebay (2) 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 perpendicular to water (flow) direction, inverted T shape dam far from the distance of intake pool (3) be the 0.2-0.4 of forebay (2) length doubly, 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 dark 0.5 times of forebay (2) pool inner water, and lower dam (4) is highly dark 0.4 times of forebay (2) pool inner water; Described upper dam (5) is cuboid, and upper dam (5) length is 0.1 times of forebay (2) width, and upper dam (5) width is dark 0.5 times of forebay (2) pool inner water, and upper dam (5) are highly dark 0.4 times of forebay (2) pool inner water.
2. a kind of Forebay of Pumping Station inverted T shape dam according to claim 1 fluidised form improving device, is characterized in that: described upper dam (5) is wide 0.45 times in forebay (2) pond apart from the distance of forebay (2) recirculating zone.
3. a kind of Forebay of Pumping Station inverted T shape dam according to claim 1 fluidised form improving device, is characterized in that: the lower dam (4) on described T-shaped dam, upper dam (5) are concrete component.
4. a kind of Forebay of Pumping Station inverted T shape dam according to claim 1 fluidised form improving device, is characterized in that: described inverted T shape dam is 0.3 times of forebay (2) length far from the distance of intake pool (3).
5. a Forebay of Pumping Station inverted T shape dam fluidised form ameliorative way, comprise front portion, forebay (2) and connect inlet culvert (1), forebay (2) rear portion arranges intake pool (3), it is characterized in that: in forebay (2), rear portion, recirculating zone arranges inverted T shape dam, inverted T shape dam is vertical with water (flow) direction, inverted T shape dam is inverted T-shaped at the section perpendicular to water (flow) direction, inverted T shape dam far from the distance of intake pool (3) be the 0.2-0.4 of forebay (2) length doubly; 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) is to stopping from the current before dam and shunting, and the flowing destroying these place's current is stablized, and strengthens the energy exchange of forebay (2) interior current further, improves the flow rate of water flow of large side, recirculating zone, forebay (2), reduces the Sediment Siltation of side, large recirculating zone; Lower dam (4) utilizes vortex effect to the current that it passes through, by blending current, strengthen the diffusion of turbulent fluctuation energy, 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 dark 0.5 times of forebay (2) pool inner water, and lower dam (4) is highly dark 0.4 times of forebay (2) pool inner water; Described upper dam (5) is cuboid, and upper dam (5) length is 0.1 times of forebay (2) width, and upper dam (5) width is dark 0.5 times of forebay (2) pool inner water, and upper dam (5) are highly dark 0.4 times of forebay (2) pool inner water.
6. a kind of Forebay of Pumping Station inverted T shape dam according to claim 5 fluidised form ameliorative way, is characterized in that: described upper dam (5) is wide 0.45 times in forebay (2) pond apart from the distance of recirculating zone.
7. a kind of Forebay of Pumping Station inverted T shape dam according to claim 5 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 adopted separately to build 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.
8. a kind of Forebay of Pumping Station inverted T shape dam according to claim 5 fluidised form ameliorative way, is characterized in that: described inverted T shape dam is 0.3 times of forebay (2) length far from the distance of intake pool (3).
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| CN201510211288.1A CN104805797B (en) | 2015-04-29 | 2015-04-29 | Forebay of Pumping Station inverted T shape dam fluidised form improves devices and methods therefor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909566A (en) * | 2016-05-17 | 2016-08-31 | 中国农业大学 | Combined type vortex control device for pump station water inlet flow field |
| 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 |
| CN109797715A (en) * | 2019-01-21 | 2019-05-24 | 河海大学 | A method of optimization aqueduct diffuser hydraulic flow state |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909566A (en) * | 2016-05-17 | 2016-08-31 | 中国农业大学 | Combined type vortex control device for pump station water inlet flow field |
| 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 |
| CN109797715A (en) * | 2019-01-21 | 2019-05-24 | 河海大学 | A method of optimization aqueduct diffuser hydraulic flow state |
| 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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| CN104805797B (en) | 2016-09-28 |
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