CN111119131A - Novel flat plate gate device capable of eliminating vortex in front of gate - Google Patents
Novel flat plate gate device capable of eliminating vortex in front of gate Download PDFInfo
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- CN111119131A CN111119131A CN202010014073.1A CN202010014073A CN111119131A CN 111119131 A CN111119131 A CN 111119131A CN 202010014073 A CN202010014073 A CN 202010014073A CN 111119131 A CN111119131 A CN 111119131A
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- 230000004888 barrier function Effects 0.000 claims abstract description 53
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- 230000000694 effects Effects 0.000 abstract description 5
- 230000002542 deteriorative effect Effects 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 230000008030 elimination Effects 0.000 description 5
- 238000003379 elimination reaction Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- E02B7/20—Movable barrages; Lock or dry-dock gates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Barrages (AREA)
Abstract
The invention belongs to the field of water conservancy and hydropower, and relates to a novel flat gate device capable of eliminating vortex in front of a gate. Two curve type barriers which are as high as the gate and are tightly attached to the surface of the gate are vertically arranged on the upstream surface of the gate, and the curve requirements of the curve type barriers are given. The hyperbolic vortex-eliminating barrier has the advantages that the hyperbolic vortex-eliminating barrier can play a vortex-eliminating effect when different submerging water depths and different gate opening degrees are realized, the hyperbolic vortex-eliminating barrier is simple in structure, convenient to arrange, easy to overhaul and maintain, free of influence on the flow state of water flow in front of a gate and the flow capacity of the gate, free of introduction of new harmful vortex and free of generation of additional surface vortex lines and surface sunken vortex. Therefore, the phenomena of reducing the flow capacity, intensifying the turbulent motion of water flow, causing the vibration of a water passing structure, deteriorating the flow state of the water flow, causing cavitation and cavitation erosion and the like caused by the existence of the vortex in front of the gate are reduced, and the safe operation of the project is ensured.
Description
Technical Field
The invention belongs to the field of water conservancy and hydropower, and relates to a novel flat gate device capable of eliminating vortex in front of a gate, which can effectively eliminate harmful vortex in front of the gate, can not introduce new harmful vortex, can not generate additional surface vortex lines and surface sunken vortex, can improve the flow state of water flow, can ensure the flow capacity, can avoid damage caused by strong flow-induced vibration of hydraulic structures such as the gate, a gate pier and the like due to the generation of the harmful vortex, can reduce the cavitation and erosion phenomenon caused by air carried by the vortex of downstream hydraulic structures or hydraulic machines, and can ensure the engineering safety.
Background
In the prior art, the research of the current vortex-eliminating device is mostly concentrated on water inlets of power stations, flood discharging tunnels and the like, the submergence degree of the water inlets is large, and the structural form is fixed. In some water and power engineering projects that have been completed and are in progress, it has been found that with varying water levels at different gate openings, either strong or weak vortices are found in front of the gate. The vortex of the air suction funnel generated in front of the gate can cause serious hazards of deteriorating the flow state of a water inlet of the gate hole, reducing the inflow rate of the gate hole, influencing the discharge, generating huge sound, causing the vibration of the gate, threatening the safety of a hydraulic building and the like. In order to reduce or avoid the harm of harmful vortexes, ensure the safe operation of hydraulic engineering and bring the maximum benefit into play, it is necessary to eliminate vortexes formed in front of the gate. The research on the vortex eliminating device for vortex in front of the flood discharge gate is mainly aimed at a specific project. The existing vortex-eliminating buildings are mostly used for water inlets of flood discharging tunnels, power stations and the like with large submergence and fixed and unchangeable structural forms. For example, the vortex-eliminating floating mat is not fixed, when the water level fluctuation in front of the gate is large, the vortex-eliminating floating mat can impact the gate, so that the floating mat and the gate are damaged, and the problems of maintenance and repair are caused; the vortex eliminating frame is huge in size, so that the overflowing capacity of the water inlet is reduced; the vortex elimination grating is fixed on the structure and can only eliminate the vortex in a specific water level range. The vortex eliminating buildings are difficult to arrange in front of the gate, the variation of the depth range of the submerged water in front of the gate is large, and the effective water level range of the vortex eliminating structure fixed at a certain elevation is difficult to guarantee. The flat gate also has the requirements on downstream flow when the flat gate is opened and closed and has different opening degrees, and the vortex-eliminating buildings have complex structures and large sizes and are easy to influence the flow passing capacity, so the vortex-eliminating buildings are not suitable for eliminating the vortex in front of the gate.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the novel flat plate gate device which is simple in design, uniform in stress and reasonable in structure and can eliminate the vortex in front of the gate. The vortex eliminating measures are guaranteed to eliminate vortexes, and meanwhile the flow state and the flow passing capacity of water flow in front of the gate are not affected. The curved barrier arranged on the upstream surface of the flat gate can play a role of vortex elimination at different submerging water depths and different gate opening degrees.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a new flat gate device capable of eliminating vortex in front of gate comprises a flat gate 1 and a curved barrier 2; the height of the curved barrier 2 is the same as that of the flat gate 1, and the two curved barriers 2 are vertically and symmetrically fixed on the upstream surface of the flat gate 1; the curved barrier 2 is flush with the top and the bottom of the flat gate 1, the distance between the two curved barriers 2 and the two sides of the flat gate 1 is the same, and the curved line type rotating direction of the curved barrier 2 is opposite to the vortex rotating direction when the curved barrier 2 is arranged;
the curve shape of the curve-shaped barrier 2 is a sine curve of one period, the period is the height of the flat gate 1, the width of the curve-shaped barrier 2 is set as A, and the amplitude is 0.3-0.8A; wherein the amplitude is preferably 0.5A; width selection range of the curved barrier 2: among all the vortexes, the vortexes which are farthest away from the flat gate 1 have a distance L from the center of the vortexes to the flat gate 1, and the value range of A is more than 0 and less than or equal to 0.5L, preferably 0.3L; the ratio of the distance between the middle line of the curved barrier 2 and the side wall of the adjacent gate pier to the width of the flat gate 1 is 0.114-0.171, preferably 0.143; the thickness of the curved grid 2 has no effect on the eddy current and can therefore be chosen according to the specific structure.
The principle is as follows: the water flow before the gate, namely the tangential flow velocity outside the vortex, impacts the curved barrier 2 for vortex elimination, and then the circulation of the vortex is destroyed, so that the effect of eliminating the vortex is achieved; the curved barrier 2 is arranged in the vortex area, so that an incoming flow rotary route is blocked, and the water surface vortex circulation quantity is reduced; meanwhile, the development area of the vortex is reduced, and the structure of the vortex is damaged, so that the vortex prevention and elimination effects are achieved.
The invention has the beneficial effects that:
(1) the structure is simple, the cost is low, the installation is convenient, and the maintenance is easy;
(2) other functions such as the flow state of water flow in front of the gate, the gate overflowing capacity, the normal operation of the flat gate, the maintenance and the like are not influenced;
(3) the vortex generated when the gate is partially opened in different water depths before the gate can be effectively eliminated, and new harmful vortex can not be introduced, and additional surface vortex grains and surface sunken vortex can not be generated;
(4) the damage caused by the strong flow-induced vibration phenomenon of hydraulic structures such as gates, gate piers and the like due to the generation of harmful vortexes is avoided;
(5) noise generated by the vortex is reduced;
(6) the cavitation and cavitation phenomena caused by the air carried by the vortex in the downstream hydraulic structure or hydraulic machine are reduced, and the engineering safety is ensured.
Drawings
FIG. 1 is a schematic view of an apparatus of the present invention;
FIG. 2 is a schematic three-dimensional view of a curvilinear barrier;
fig. 3(a), 3(b) and 3(c) are a front view, a side view and a top view, respectively, of the curved louvres.
In the figure: 1, a flat gate; 2, a curved grid.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
A new flat gate structure for eliminating the vortex in front of the gate as shown in fig. 1 comprises a flat gate 1 and a curved barrier 2. The structure of the curved barrier 2 is shown in fig. 2, 3(a), 3(b) and 3 (c).
In the embodiment, the gate height of a certain flood discharge gate is 16m, the gate width is 7m, model tests show that the difference of the transverse positions of vortexes is small under the conditions that the vortexes in front of the gate are at different opening degrees and different water depths in front of the gate, and the center of each vortex moves near 1.0m away from the side wall of the gate pier; the gate is replaced by the flat gate which can eliminate the vortex in front of the gate, or the curved barrier 2 is arranged on the upstream surface of the gate, so that the novel flat gate device which can eliminate the vortex in front of the gate is formed; selecting the curved barrier 2 to be arranged at the position with the ratio of the distance from the side wall of the gate pier to the width of the flat gate 2 of 0.143, wherein the distance from the side wall of the curved center gate pier of the curved barrier 2 is 1.0 m; width range of the curved barrier 2: the center of the vortex farthest from the gate is 2.10m closest to the gate, and the closest distance is 0.5 times the closest distance, namely 1.05m, so the width range selected by the curved barrier 2 is 0-1.05 m, and 0.6m is selected in the embodiment. The amplitude of the curved louvres 2 is 0.5 times the width, i.e. 0.3m is chosen. The thickness is chosen to be 0.04m according to the structural requirements. The curve of the selected curve-shaped barrier 2 is similar to a sine curve with the period of 16m, the height of the curve-shaped barrier 2 is 1 period, the height of the curve-shaped barrier is the same as that of the flat gate 1, 16m is selected, the two curve-shaped barriers 2 are symmetrically fixed on the upstream surface of the flat gate 1, the top and the bottom of the curve-shaped barrier 2 and the bottom of the flat gate 1 are flush, the distances between the two curve-shaped barriers 2 and two side edges of the flat gate 1 are the same, the curve-shaped barriers are symmetrically arranged, the rotation direction of the curve is opposite to the rotation direction of a vortex when the curve-shaped barrier is arranged, namely the curve-shaped barrier on the left side of the gate is arranged like's'; the curved barrier 2 is arranged on the upstream surface of the flat gate and is vertically arranged and clings to the surface of the flat gate. The curved barrier 2 is arranged in front of the flat gate 1, so that the front vortex of the gate can be effectively eliminated in front of the gate under the water level in front of any gate, and construction and later maintenance are facilitated. The hyperbolic barrier breaks the incoming flow circulation quantity formed by the vortex, blocks the incoming flow rotation route and reduces the water surface vortex circulation quantity; meanwhile, the development range of the vortex is reduced, and the vortex structure is damaged, so that the vortex prevention and elimination effects are achieved.
In the experiment, when the curved barrier 2 is not arranged in front of the flat gate 1, 1.25 pairs of vortexes are evenly generated in the front of the flat gate 1 every minute, and the vortexes are intermittent air suction vortexes or through air suction vortexes; under the condition of different gate apertures, the lower water depth before the gate can appear through-type vortex of breathing in always in gate both sides, and the air intake is big, and the radius that the vortex formed is great, and the frequency that the vortex appears is fast, and duration is long, and the vortex can also arouse flat gate 1 vibration. After the curved barrier 2 is symmetrically arranged on the flat gate 1, intermittent air suction vortex and through air suction vortex cannot be generated in front of the gate, and new surface vortex and surface sunken vortex cannot be introduced.
Claims (2)
1. The novel flat gate device capable of eliminating the vortex in front of the gate is characterized by comprising a flat gate (1) and a curved barrier (2); the height of the curved barrier (2) is the same as that of the flat gate (1), and the two curved barriers (2) are vertically and symmetrically fixed on the upstream surface of the flat gate (1); the top and the bottom of the curved barrier (2) are flush with the top and the bottom of the flat gate (1), the distances between the two curved barriers (2) and the two side edges of the flat gate (1) are the same, and the curve linear rotating direction of the curved barrier (2) is opposite to the vortex rotating direction during arrangement;
the curve shape of the curve-shaped barrier (2) is a sine curve of one period, the period is the height of the flat gate (1), the width of the curve-shaped barrier (2) is set as A, and the amplitude is 0.3-0.8A; the width selection range of the curved barrier (2): among all the vortexes, the vortexes which are farthest away from the flat gate (1) have a distance L from the center of the vortexes to the flat gate (1), and the value range of A is more than 0 and less than or equal to 0.5L; the ratio of the distance between the centerline of the curved barrier (2) and the side wall of the adjacent gate pier to the width of the flat gate (1) is 0.114-0.171.
2. The new flat plate gate device capable of eliminating the swirl before the gate according to claim 1, wherein the curved barrier (2) has a curve amplitude of 0.5A, a-0.3L; the ratio of the distance between the middle line of the curved barrier (2) and the side wall of the adjacent gate pier to the width of the flat gate (1) is 0.143.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014073.1A CN111119131A (en) | 2020-01-07 | 2020-01-07 | Novel flat plate gate device capable of eliminating vortex in front of gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014073.1A CN111119131A (en) | 2020-01-07 | 2020-01-07 | Novel flat plate gate device capable of eliminating vortex in front of gate |
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| Publication Number | Publication Date |
|---|---|
| CN111119131A true CN111119131A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010014073.1A Pending CN111119131A (en) | 2020-01-07 | 2020-01-07 | Novel flat plate gate device capable of eliminating vortex in front of gate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188611A (en) * | 2021-05-28 | 2021-07-30 | 北京科源昌旭科技有限公司 | Variable section flow measuring device for channel water delivery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB207863A (en) * | 1922-09-05 | 1923-12-05 | Eric Charles Bendyshe Walton | Improvements in or relating to sluice gates or weirs |
| CN106087900A (en) * | 2016-08-05 | 2016-11-09 | 浙江水利水电学院 | High water head gates of segmental shape opens and closes vibration absorber |
| CN108625344A (en) * | 2018-05-11 | 2018-10-09 | 杨文彬 | A kind of Flood Prevention stop gate with Internet of Things warning function |
| CN211596673U (en) * | 2020-01-07 | 2020-09-29 | 大连理工大学 | Novel flat plate gate device capable of eliminating vortex in front of gate |
-
2020
- 2020-01-07 CN CN202010014073.1A patent/CN111119131A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB207863A (en) * | 1922-09-05 | 1923-12-05 | Eric Charles Bendyshe Walton | Improvements in or relating to sluice gates or weirs |
| CN106087900A (en) * | 2016-08-05 | 2016-11-09 | 浙江水利水电学院 | High water head gates of segmental shape opens and closes vibration absorber |
| CN108625344A (en) * | 2018-05-11 | 2018-10-09 | 杨文彬 | A kind of Flood Prevention stop gate with Internet of Things warning function |
| CN211596673U (en) * | 2020-01-07 | 2020-09-29 | 大连理工大学 | Novel flat plate gate device capable of eliminating vortex in front of gate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188611A (en) * | 2021-05-28 | 2021-07-30 | 北京科源昌旭科技有限公司 | Variable section flow measuring device for channel water delivery |
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