CN106869091A - Dissipater of hole stopper and its aeration method are pressed in a kind of having for achievable air mixing corrosion reducing - Google Patents
Dissipater of hole stopper and its aeration method are pressed in a kind of having for achievable air mixing corrosion reducing Download PDFInfo
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- CN106869091A CN106869091A CN201710026220.5A CN201710026220A CN106869091A CN 106869091 A CN106869091 A CN 106869091A CN 201710026220 A CN201710026220 A CN 201710026220A CN 106869091 A CN106869091 A CN 106869091A
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- hole
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- dissipater
- well
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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)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
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- Details Of Valves (AREA)
Abstract
Dissipater of hole stopper and its aeration method are pressed in a kind of having for achievable air mixing corrosion reducing of the present invention, this is made up of pressure dissipater of hole stopper the flowing hole set in the hole plug matrix in flood discharging tunnel and hole plug matrix, hole plug matrix includes sudden contraction front end and sudden expansion rear end, hole plug matrix is provided with least one ventilation well communicated with air, the axis of well of ventilating fills in the axis of matrix perpendicular to hole, and the distance between axis and hole the plug matrix sudden contraction front end of ventilation well L is the 1.5~2% of flood discharging tunnel hole footpath.The present invention puts pressure less than atmospheric pressure using well location of ventilating, air can continually be filled in into hole by well of ventilating, diffuse to hole plug active section upstream, downstream and the whole working section for flowing vertically to, and continuously aeration process is formed, so as to reduce or remit the cavitation erosion of hole plug sudden contraction front end and sudden expansion back-end region.
Description
Technical field
The invention belongs to the hole plug energy-dissipating tech field in hydraulic engineering, it is related to a kind of by that there can be pressure hole to fill in flood discharge
Energy dissipater and its aeration method of air mixing corrosion reducing are realized in hole.
Background technology
Dissipater of hole stopper is not only simple in structure, and can effectively solve height as a kind of form for having stream energy dissipater in pressure
The Dissipation of Energy of head, big flow flood discharging tunnel, its energy dissipating effect occurs mainly in hole and fills in the strong turbulent fluctuation shearing after sudden contraction, sudden expansion
Area, but because hole plug sharp-edged flow velocity is big, current are separated, therefore the easy cavitation in the position, or even cause cavitation erosion.
It is mainly by design optimization to reduce for the measure for having stream energy dissipater prevention deduction and exemption cavitation and cavitation erosion in pressure at present
Flow velocity, control excessively stream wall irregularity degree and the anti-cavitation corrosion material of use.But above-mentioned measure need to be pre-designed, in extremely special feelings
Easily failed under condition.
In traditional hydroelectric project discharge construction, the region that cavitation often may occur to current is ventilated and to form aerated water
Stream, can play a part of to reduce or remit cavitation corrosion when aeration volumetric concentration reaches 3~4%, be a kind of warp for using both at home and abroad at present
Help and effective corrosion inhibitor measure.However, having pressure aeration measure because of its complicated aqueous vapor two-phase phenomenon, the characteristics of motion of aerated flow
It is different from non-aerated flow and increasingly complex, and have in pressure that the current speed of service, pressure change are larger in stream energy dissipater, if blind
Mesh aeration may bring following adverse effect to energy-dissipating installation：(1) current aeration causes water body expansion, the depth of water is substantially increased,
The safe operation of flood discharge water channel can be influenceed, the discharge capacity of flood-relief channel can be also influenceed；(2) in flood-discharge tunnel, if to aeration
Influence underestimate, it is possible to create pressure flow replaces with pressure free current, so that current can constantly impact hole wall, threatens barrel
Safety；(3) increase fluctuating pressure, the flashy load of building can be increased, also increase the possibility of vibration of building, so that
Certain destruction is brought to building；Due to above-mentioned adverse effect, current aeration rarely has and applies to have pressure energy dissipating engineering.
Therefore, have pressure hole plug realize that current aeration has highly important application value in dissipater of hole stopper journey field,
It is also simultaneously the Research Challenges of this area.
The content of the invention
The purpose of the present invention is intended to have cavitation and cavitation erosion problem present in pressure dissipater of hole stopper for existing, there is provided Yi Zhongke
That realizes air mixing corrosion reducing has pressure dissipater of hole stopper, by the current aeration filled in hole, reduces or remits the destruction of cavitation and cavitation erosion.
Another object of the present invention aims to provide a kind of above-mentioned method for having pressure dissipater of hole stopper aeration.
To reach above-mentioned purpose, the present invention is realized using following technical scheme.
There is pressure dissipater of hole stopper the invention provides a kind of achievable air mixing corrosion reducing, base is filled in by the hole in flood discharging tunnel
The flowing hole composition set in body and hole plug matrix, the hole plug matrix includes sudden contraction front end and sudden expansion rear end, and base is filled in the hole
Body is provided with least one ventilation well communicated with air, and the axis of the ventilation well fills in the axis of matrix perpendicular to hole, and logical
It is the 1.5~2% of flood discharging tunnel hole footpath that the axis of gas well fills in the distance between matrix sudden contraction front end L with hole.When high-velocity flow is flowed through
During the plug matrix sudden contraction front end of hole, pressure drastically declines, and when pressure is less than atmospheric pressure at well of ventilating, air can be entered by well of ventilating
Enter flowing hole, the air into flowing hole is acted on on the plug matrix active section of hole by differential pressure action and recirculating zone water-borne
Trip, downstream and the whole section diffusion for flowing vertically to, form one layer of aeration properties layer, so as to realize convection current through excessively stream near wall region
The current aeration in hole, reduces or remits sudden contraction front end and sudden contraction back-end region cavitation erosion.In order to meet flood discharging tunnel current aeration requirement, can
With flood discharging tunnel actual conditions, multiple ventilation wells are set up on the plug matrix of hole, multiple ventilation well can be perpendicular to hole plug axis
It is uniformly distributed in plane.
Above-mentioned achievable air mixing corrosion reducing has pressure dissipater of hole stopper, in order to reduce the ventilation increased by pipe bending resistance
Power, improves aeration efficiency and aeration adjustable extent, and should try one's best makes ventilation well straight unimpeded, and well of being ventilated in the present invention is for circle is logical
Hole.
Above-mentioned achievable air mixing corrosion reducing has pressure dissipater of hole stopper, when the wind speed in well of ventilating is excessive, can cause ventilation
When noise it is excessive, therefore generally require control ventilation well in mean wind speed no more than 50m/s, in order to realize the control to wind speed
On the other hand system, on the one hand can be provided for controlling air-flow velocity by the aperture of limitation ventilation well on ventilation well
Device, such as electrically operated valve, wherein ventilation well aperture be generally the 2~3% of flood discharging tunnel hole footpath.
Invention further provides the above-mentioned aeration method for having and pressing dissipater of hole stopper, comprise the following steps：
Step (A), judges whether flow rate of water flow is higher than setting value and ventilation well and setting in the plug matrix of hole in flood discharging tunnel
Flowing hole mutually pass through position pressure whether subatmospheric, if flow rate of water flow is filled in higher than setting value and ventilation well and hole in flood discharging tunnel
The flowing hole set in matrix mutually passes through the pressure subatmospheric at position, then into step (B), well of otherwise ventilating remains off shape
State；
Step (B), opens the electrically operated valve on ventilation well, and adjusting the aperture of electrically operated valve makes hole fill in matrix sudden contraction section closely
Wall area current aeration volumetric concentration is 3~5%.
Above-mentioned to have the aeration method for pressing dissipater of hole stopper, the flow rate of water flow setting value is not less than 20m/s.
Above-mentioned to have the aeration method for pressing dissipater of hole stopper, the hole plug matrix sudden contraction section referred to hole plug matrix sudden contraction front end
And the region between sudden expansion rear end.
The pressure dissipater of hole stopper that has of achievable air mixing corrosion reducing of the present invention is applied in having pressure flood discharging tunnel energy dissipating, is used
When, the pressure dissipater of hole stopper that has that at least one is capable of achieving air mixing corrosion reducing is arranged on the lower flat section of pressure flood discharging tunnel.
Compared with prior art, the invention has the advantages that：
1st, achievable air mixing corrosion reducing of the invention has pressure dissipater of hole stopper in the hole plug matrix for having pressure hole plug before sudden contraction
Ventilation well is set at 1.5~2% flood discharging tunnel hole footpaths of end, and because ventilation well location puts pressure less than atmospheric pressure, air can in a steady stream not
It is open close to cross ventilation well into hole plug, the whole working section for diffusing to hole plug active section upstream, downstream and flowing vertically to, and shape
Into continuously aeration process, so as to reduce or remit the cavitation erosion of hole plug sudden contraction front end area and sudden expansion back-end region.
2nd, the pressure dissipater of hole stopper that has of the achievable air mixing corrosion reducing of the present invention only sets logical by filling in matrix correct position in hole
Gas well can just reach the active section near wall big cross section that flows vertically to the even effect of whole-section aeration, with simple structure,
The characteristics of aeration efficiency high.
3rd, the pressure dissipater of hole stopper that has of the achievable air mixing corrosion reducing of the present invention can be small in flood discharge in-cavity construction, boundary of works area,
Without digging on a large scale, fill out, thus easy construction, construction cost is low.
4th, the present invention has the aeration method of pressure dissipater of hole stopper, realizes that current are mixed using the mode of hole plug matrix natural aspiration
Gas, can not only reduce or remit hole and fill in cavitation destruction that may be present, and greatly reduce construction, operating cost, be suitable to
There is pressure hole to be promoted the use of in filling in energy dissipating.
Brief description of the drawings
Fig. 1 be achievable air mixing corrosion reducing of the present invention have pressure dissipater of hole stopper structure chart and the combination with flood discharging tunnel
Schematic diagram.
Fig. 2 is the A-A sectional views of Fig. 1.
Wherein, 1- flood discharging tunnels, 2- holes plug matrix, 21- sudden contractions front end, 22- sudden expansions rear end, 3- ventilation wells, 4- electrically operated valves.
Specific embodiment
Clear, complete description is carried out to technical scheme below with reference to drawings and Examples.
As shown in figure 1, present embodiments provide a kind of achievable air mixing corrosion reducing has pressure dissipater of hole stopper, by positioned at flood discharge
The cylindrical bore plug matrix 2 of flat section and the interior circular flowing hole composition for setting of hole plug matrix 2 under in hole 1.Hole plug matrix 2 includes prominent
Contracting front end 21 and sudden expansion rear end 22, hole plug matrix 2 are provided with the ventilation well 3 communicated with air, and the axis of well 3 of ventilating is perpendicular to hole
The axis of matrix 2 is filled in, and the axis of ventilation well 3 fills in the distance between the sudden contraction front end 21 of matrix 2 L for the hole footpath D of flood discharging tunnel 1 with hole0
1.5~2%.
As shown in Figures 1 and 2, ventilation well 3 can fill in the top of matrix 2 and extend upwardly at the top of flood discharging tunnel 1 from hole；Ventilation well
3 is manhole, so that passage is straight unimpeded, is reduced because of the aeration resistance of pipe bending increase, to improve aeration efficiency and mix
Gas adjustable extent；The aperture D of ventilation well 31It is the hole footpath D of flood discharging tunnel 102~3%, with ensure ventilate well 3 in mean wind speed
No more than 50m/s；It is further provided with entering for adjusting the electrically operated valve 4 of the ventilation air-flow velocity of well 3 on ventilation well 3, so that
Throughput meets current aeration requirement.
The above-mentioned aeration method for having pressure dissipater of hole stopper is comprised the following steps：
Step (A), judges whether flow rate of water flow is higher than setting value and ventilation well 3 and setting in the plug matrix 2 of hole in flood discharging tunnel 1
Flowing hole mutually pass through position pressure whether subatmospheric, if in flood discharging tunnel 1 flow rate of water flow higher than setting value and ventilation well 3 with
The flowing hole set in the plug matrix 2 of hole mutually passes through the pressure subatmospheric at position, then into step (B), well 3-dimensional of otherwise ventilating is held
Closed mode；
Step (B), opens the electrically operated valve 4 on ventilation well 3, and adjusting the aperture of electrically operated valve 4 makes hole fill in the sudden contraction of matrix 2
Section near wall region current aeration volumetric concentration is 3~5%.
Above-mentioned steps (A) are to judge whether to need to open ventilation well 3, when flow rate of water flow (the i.e. flood discharging tunnel in flood discharging tunnel 1
Under 1 in flat section hole fill in the front or behind of matrix 2 flow rate of water flow) be not more than setting value or ventilation well at pressure be not less than air
During pressure, then illustrate flood discharging tunnel 1 exist cavitation and cavitation erosion risk it is smaller or be unable to reach air and enter and require, it is not necessary to open logical
Gas well 3；When the flowing hole of setting in well 3 and hole plug matrix 2 of ventilating mutually passes through position pressure is not less than atmospheric pressure, can by
Supercharging air is first made atmospheric pressure more than pressure at ventilation well by the mode that booster pump is set on ventilation well 3, and then air is drawn
Enter the purpose that hole plug matrix reaches current aeration, this mode obviously can greatly increase energy dissipating engineering cost；When in flood discharging tunnel 1
When flow velocity is more than setting value and at ventilation well during pressure subatmospheric, then illustrate flood discharging tunnel 1 exist the risk of cavitation and cavitation erosion compared with
Greatly, it is necessary to open ventilation well 3.Above-mentioned setting value refers to occur at flood discharging tunnel hole plug active section sudden contraction front end 21 and sudden expansion rear end 22
The dangerous water velocity of cavitation and cavitation erosion, the setting value can be according to the specific build of each flood discharging tunnel, size and energy dissipating instrument
Body quantities etc. by test of many times determine, it is considered that when current when flow rate of water flow is more than 20m/s it is necessary to consider because of current
Flow velocity is excessive and the hole plug cavitation corrosion cavitation that causes of matrix is destroyed, therefore setting value is not less than 20m/s.
In above-mentioned steps (B), the aperture of electrically operated valve 4 is adjusted, hole is filled in the current aeration body of the sudden contraction of matrix 2 section near wall region
Product concentration is 3~5%, so as to reduce or remit the cavitation erosion in hole match sudden contraction and sudden expansion region, hole plug matrix 2 sudden contraction section referred to hole plug
Region between the sudden contraction front end 21 of matrix 2 and sudden expansion rear end 22.
One of ordinary skill in the art will be appreciated that, embodiment here is to aid in reader and understands of the invention
Principle, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.This area it is common
Technical staff can make various other various tools for not departing from essence of the invention according to these technical inspirations disclosed by the invention
Body deforms and combines, and these deformations and combination are still within the scope of the present invention.
Claims (8)
1. a kind of achievable air mixing corrosion reducing has pressure dissipater of hole stopper, fills in matrix (2) by the hole in flood discharging tunnel (1) and hole is filled in
The flowing hole composition set in matrix (2), matrix (2) is filled in the hole includes sudden contraction front end (21) and sudden expansion rear end (22), and it is special
It is that at least one ventilation well (3) communicated with air is provided with hole plug matrix (2) to levy, the axle of ventilation well (3)
Line perpendicular to hole plug matrix (2) axis, and ventilation well (3) axis and hole fill between matrix (2) sudden contraction front end (21) away from
It is the 1.5~2% of flood discharging tunnel (1) hole footpath from L.
2. air mixing corrosion reducing can be realized according to claim 1 has pressure dissipater of hole stopper, it is characterised in that the ventilation well (3)
It is manhole.
3. air mixing corrosion reducing can be realized according to claim 2 has pressure dissipater of hole stopper, it is characterised in that the ventilation well (3)
Interior mean wind speed is not more than 50m/s.
4. air mixing corrosion reducing can be realized according to claim 3 has pressure dissipater of hole stopper, it is characterised in that the ventilation well (3)
Aperture for flood discharging tunnel (1) hole footpath 2~3%.
5. air mixing corrosion reducing is capable of achieving according to any claim in Claims 1-4 has pressure dissipater of hole stopper, its feature
It is to be provided with electrically operated valve (4) on ventilation well (3).
6. the aeration method of pressure dissipater of hole stopper is had in claim 1 to 5 described in any claim, it is characterised in that the aeration
Method is comprised the following steps：
Step (A), judges whether flood discharging tunnel (1) interior flow rate of water flow is higher than that setting value and ventilation well (3) are filled in hole and set in matrix (2)
The flowing hole put mutually pass through position pressure whether subatmospheric, if flood discharging tunnel (1) interior flow rate of water flow be higher than setting value and ventilation
Well (3) fills in the pressure subatmospheric that the flowing hole set in matrix (2) mutually passes through position with hole, then into step (B), otherwise lead to
Gas well (3) remains off state；
Step (B), opens the electrically operated valve (4) in ventilation well (3), and adjusting the aperture of electrically operated valve (4) makes hole fill in matrix (2)
The aeration volumetric concentration of sudden contraction section near wall region current is 3~5%.
7. the aeration method of pressure dissipater of hole stopper is had described in claim 6, it is characterised in that the flow rate of water flow setting value is not for
Less than 20m/s.
8. the aeration method of pressure dissipater of hole stopper is had described in claim 6 or 7, it is characterised in that fill in matrix (2) sudden contraction in the hole
Section refers to the region between hole plug matrix (2) sudden contraction front end (21) and sudden expansion rear end (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026220.5A CN106869091B (en) | 2017-01-13 | 2017-01-13 | A kind of achievable air mixing corrosion reducing has pressure dissipater of hole stopper and its aeration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026220.5A CN106869091B (en) | 2017-01-13 | 2017-01-13 | A kind of achievable air mixing corrosion reducing has pressure dissipater of hole stopper and its aeration method |
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| Publication Number | Publication Date |
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| CN106869091A true CN106869091A (en) | 2017-06-20 |
| CN106869091B CN106869091B (en) | 2018-08-07 |
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| CN201710026220.5A Expired - Fee Related CN106869091B (en) | 2017-01-13 | 2017-01-13 | A kind of achievable air mixing corrosion reducing has pressure dissipater of hole stopper and its aeration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080182A (en) * | 2019-05-30 | 2019-08-02 | 长江勘测规划设计研究有限责任公司 | Fill in energy-dissipating structure and its method for arranging in diversion tunnel hole |
| CN112033812A (en) * | 2020-08-12 | 2020-12-04 | 成都北方石油勘探开发技术有限公司 | Method and system for testing shear-swelling flow conductivity of hydraulic shear fracturing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1501575A1 (en) * | 1987-11-18 | 1992-05-23 | Южный научно-исследовательский институт гидротехники и мелиорации | Outlet cap of pressure spillway |
| CN101280557A (en) * | 2008-05-23 | 2008-10-08 | 水利部交通部电力工业部南京水利科学研究院 | Method for rebuilding guide current hole to jet flow internal energy dissipating drilled shaft flood discharge hole |
-
2017
- 2017-01-13 CN CN201710026220.5A patent/CN106869091B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1501575A1 (en) * | 1987-11-18 | 1992-05-23 | Южный научно-исследовательский институт гидротехники и мелиорации | Outlet cap of pressure spillway |
| CN101280557A (en) * | 2008-05-23 | 2008-10-08 | 水利部交通部电力工业部南京水利科学研究院 | Method for rebuilding guide current hole to jet flow internal energy dissipating drilled shaft flood discharge hole |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080182A (en) * | 2019-05-30 | 2019-08-02 | 长江勘测规划设计研究有限责任公司 | Fill in energy-dissipating structure and its method for arranging in diversion tunnel hole |
| CN110080182B (en) * | 2019-05-30 | 2023-12-05 | 长江勘测规划设计研究有限责任公司 | Diversion tunnel plug energy dissipation structure and arrangement method thereof |
| CN112033812A (en) * | 2020-08-12 | 2020-12-04 | 成都北方石油勘探开发技术有限公司 | Method and system for testing shear-swelling flow conductivity of hydraulic shear fracturing |
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| Publication number | Publication date |
|---|---|
| CN106869091B (en) | 2018-08-07 |
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