CN101187204A - Aeration facility shape and its uses - Google Patents
Aeration facility shape and its uses Download PDFInfo
- Publication number
- CN101187204A CN101187204A CNA2007103034207A CN200710303420A CN101187204A CN 101187204 A CN101187204 A CN 101187204A CN A2007103034207 A CNA2007103034207 A CN A2007103034207A CN 200710303420 A CN200710303420 A CN 200710303420A CN 101187204 A CN101187204 A CN 101187204A
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- downstream
- tongue
- flow
- bottom slope
- aeration
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Abstract
The invention relates to an aeration facility body type and the function, which is on the downstream of an aeration step, wherein the upper edge and the lower edge of a water threshold tongue is smoothly linked with the bottom slope on the downstream by regulating the body type of the landing point partial area bottom slope of a flow-deflecting water tongue, and the included angle is reduced as far as possible. Usually, the included angle of the flow-deflecting water tongue and the near landing point area is below 10 degrees, thereby an entire hollow cavity is formed on the lower portion of the water tongue, which avoids forming unfavorable flow states of hollow cavity water return and backward roller length and the like, and achieving the aim of sufficient aeration of the water tongue. The downstream partial bottom slope (near the landing point of the flow-deflecting water tongue) of the invention adopts curved line connection of circular arc and parabolic curve and the like, and the bottom slope changes constantly, which can be applicable to inflow condition which changes constantly, and leads to excellent linkage of the flow-deflecting water tongue and the downstream bottom slope, thereby forming a stable hollow cavity, and the aeration facility can play excellent function.
Description
Technical field
The present invention relates to be used for a kind of aeration facility shape that reduces the cavity backwater on the Hydraulic and Hydro-Power Engineering, it is arranged on the outlet structure escape works base plate, by forcing aeration, subtracts the possibility of (exempting from) cavitation erosion.This invention especially is adapted to the flood releasing structure of Small Bottom Slope, big single wide, low your number of Buddhist.
Background technology
You counts in being provided with of air entraining facilities of flood releasing structure in Small Bottom Slope, big single wide, low Buddhist, under some specific situation, often be difficult for obtaining effective cavity, and effective cavity length are weighed an important indicator of aeration effect often.Generally, the long more aeration effect of cavity length is good more, does not often illustrate that the aeration effect is relatively poor and there is cavity.Therefore, it is very important selecting rational aeration build.
In aeration facility shape research in the past, often pay attention to selection, and study less with being connected of downstream base slope the flip shot current of aerator to upstream aerator build.Under normal conditions, the downstream base slope adopts straight line to connect, the gradient of base slope is single, can only be suitable for specific inlet flow conditions, and the reality inlet flow conditions changes constantly along with head and flow, under certain inlet flow conditions, tend to occur the flip shot current and be connected not smooth situation with the downstream base slope, the cavity backwater occurs, cavity can be die out fully when serious, and air entraining facilities can not be played a role.
Summary of the invention
The interior outlet structure escape works base plate build employing of segment distance circular arc, parabola or other non-rectilinear junction curve before and after the trajectory nappe drop point C in the aeration facility shape provided by the invention.
The present invention does not have specific (special) requirements to upstream aerator build.In the aerator downstream, by adjusting the build of trajectory nappe drop point regional area base slope, the upper limb and the lower edge of using the bank overflow are connected with the downstream base slope is smooth-going, and angle reduces as much as possible, and usually, the angle of trajectory nappe and drop point near zone is below 10 degree.Thereby below overflow, form complete cavity, avoid forming unfavorable fluidised forms such as cavity backwater and reverse whirlpool roll, reach the purpose of the abundant aeration of overflow.And then the safe operation of assurance engineering.
The present invention is particularly useful for Small Bottom Slope, big list is wide, you count flood releasing structure to hang down Buddhist, and particularly the downstream is connected the situation of base slope i＜0.1.I is meant the height of base slope inclined-plane and horizontal direction angle and the ratio of horizontal segment.
Near the local base slope in downstream of the present invention (the trajectory nappe drop point) adopts curves such as circular arc, parabola to connect, base slope is constantly to change, can be suitable for the inlet flow conditions of continuous variation, make trajectory nappe be connected good with the downstream base slope, thereby form and stablize cavity, air entraining facilities can be brought into play good action.
Description of drawings
Fig. 1 is the schematic diagram of technical solution of the present invention; Wherein the C point is a drop point among the figure.
Fig. 2 is the schematic diagram of the embodiment of the invention.
Certain large hydropower station flood discharging tunnel normal pool level 475.000m, maximum discharge per unit width is 227.54m
2/ s.When the downstream base slope adopts linear pattern to connect, can not form complete cavity under the trajectory nappe, be full of backwater in the aeration cavity and oppositely revolve and roll, air entraining facilities can not play a role.
Adopt technical scheme of the present invention, the local base slope in aerator downstream adopts the circular arc type curve, as shown in Figure 1, pile No. and dimensioning are all in m among the figure, the BD section is the circular arc type base plate, radius is R1, and the C point is that trajectory nappe (center line) impacts circular arc base plate place, and α is the two angle in tangential direction (C point position).In the 20 meters scopes in drop point C front and back, promptly the BD section adopts the circular arc type curve.Formed complete cavity under the trajectory nappe, no cavity backwater occurs, and has solved the cavity backwater problem of air entraining facilities, has guaranteed the safe operation of engineering.Wherein, the angle of trajectory nappe and circular arc type base plate is spent less than 7.5 when ordinary water level.
Claims (3)
1. aeration facility shape it is characterized in that outlet structure escape works base plate build adopts circular arc, parabola or other non-rectilinear junction curve in one segment distance of trajectory nappe drop point front and back, and the angle of trajectory nappe and drop point near zone is below 10 degree.
2. the described aeration facility shape of claim 1 is used for Small Bottom Slope, big list is wide, you count flood releasing structure to hang down Buddhist.
3. according to the purposes of the described aeration facility shape of claim 2, it is characterized in that the aerator downstream is connected base slope i＜0.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103034207A CN101187204A (en) | 2007-12-24 | 2007-12-24 | Aeration facility shape and its uses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103034207A CN101187204A (en) | 2007-12-24 | 2007-12-24 | Aeration facility shape and its uses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101187204A true CN101187204A (en) | 2008-05-28 |
Family
ID=39479784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007103034207A Pending CN101187204A (en) | 2007-12-24 | 2007-12-24 | Aeration facility shape and its uses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101187204A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011356A (en) * | 2010-11-26 | 2011-04-13 | 陈洪凯 | Curved subgrade protection structure for controlling floods and debris flow |
| CN102619200A (en) * | 2012-04-13 | 2012-08-01 | 中国水利水电科学研究院 | Energy dissipation method of sidewall aeration steps and outlet submerged flip bucket of inclined shaft type flood discharge tunnel |
| CN103821113A (en) * | 2014-01-22 | 2014-05-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Method of arranging air entraining trough on gentle-to-steep bottom slope of high velocity flow chute |
-
2007
- 2007-12-24 CN CNA2007103034207A patent/CN101187204A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011356A (en) * | 2010-11-26 | 2011-04-13 | 陈洪凯 | Curved subgrade protection structure for controlling floods and debris flow |
| CN102619200A (en) * | 2012-04-13 | 2012-08-01 | 中国水利水电科学研究院 | Energy dissipation method of sidewall aeration steps and outlet submerged flip bucket of inclined shaft type flood discharge tunnel |
| CN102619200B (en) * | 2012-04-13 | 2015-02-25 | 中国水利水电科学研究院 | Energy dissipation method of sidewall aeration steps and outlet submerged flip bucket of inclined shaft type flood discharge tunnel |
| CN103821113A (en) * | 2014-01-22 | 2014-05-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Method of arranging air entraining trough on gentle-to-steep bottom slope of high velocity flow chute |
| CN103821113B (en) * | 2014-01-22 | 2015-12-09 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of high speed water flows bottom land slope by gradual steep aeration groove method to set up |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080528 |