CN203977379U - Outlet structure escape works air entraining facilities - Google Patents
Outlet structure escape works air entraining facilities Download PDFInfo
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- CN203977379U CN203977379U CN201420429732.8U CN201420429732U CN203977379U CN 203977379 U CN203977379 U CN 203977379U CN 201420429732 U CN201420429732 U CN 201420429732U CN 203977379 U CN203977379 U CN 203977379U
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Abstract
The utility model discloses a kind of outlet structure escape works air entraining facilities, relate to Hydraulic and Hydro-Power Engineering field, provide a kind of simple in structure and can prevent the outlet structure escape works air entraining facilities of aerated cavity backwater.Outlet structure escape works air entraining facilities comprises the outlet structure escape works base plate 1 being obliquely installed, on outlet structure escape works base plate 1, be provided with aerator 2, the downstream direction of aerator 2 is provided with structure 5 after the bank that protrudes outlet structure escape works base plate 1, and after bank, structure 5 comprises first slope 4 nearer apart from aerator 2 and second slope 6 far away apart from aerator 2; The length on the first slope 4 is slightly less than aerated cavity 7 length, first falls within on the second slope 6 after making current flow through aerator 2; The gradient on the second slope 6 is greater than the gradient of outlet structure escape works base plate 1 and is greater than 0.15.The utility model is applicable to the groove of letting out of Small Bottom Slope, low Fr number, can solve the problem of aerated cavity backwater, has that aeration is effective, a feature of the simple and easy construction of build.
Description
Technical field
The utility model relates to Hydraulic and Hydro-Power Engineering field, relates in particular to the outlet structure escape works air entraining facilities that is applicable to Small Bottom Slope, low Fr number and lets out groove.
Background technology
Along with the construction successively of a collection of large medium-size station, head and the flow of flood discharge constantly increase, under high-velocity flow condition, the cavitation erosion problem of outlet structure escape works becomes increasingly conspicuous, as the outlet structure escape works in the power stations such as Liujia Gorge, Yanguoxia, two beaches all suffered cavitation erosion.The generation of cavitation corrosion, gently causes spot pitted skin, heavy form cellular even large hole, directly affects the life-span of outlet structure escape works, the safety that even jeopardizes whole building.Engineering practice shows, arranges that air entraining facilities impels current aeration effectively to alleviate and even eliminates cavitation erosion, and air mixing corrosion reducing technology has been widely used in built and project under construction, as power stations such as Feng Jiashan, Three Gorges, small stream Luo Du.Air entraining facilities generally includes structure after aerator and bank.
Count in situation in Small Bottom Slope and low Fr, if aeration facility shape design is improper, (aerated cavity refers to the space between deflecting nappe and outlet structure escape works base plate to aerated cavity; Deflecting nappe refers to that current flow through the current of jumping up after aerator) easily produce backwater, reduce effective cavity length and throughput, also may shutoff inlet channel when serious, make air entraining facilities entirely ineffective.Be for example outlet structure escape works air entraining facilities of the prior art as shown in Figure 2 and Figure 3, comprise simple linking pattern (adopting a section after bank joins with former base plate compared with flat gradient) and the recessed pattern (after bank, one steep one slow two sections of slopes are all lower than former base plate) that is connected; The simple pattern that is connected can not be eliminated aeration backwater, and after recessed linking pattern bank, water level fluctuation is obvious, fluidised form is poor.
In order to eliminate aerated cavity backwater, part engineering is revised conventional continuous aerator, several special-shaped aerators are proposed, as U-shaped bank, V-type bank and matrix bank etc., by the linear pattern of continuous aerator end make that plane is U-shaped into, V-type and matrix, utilize the percussion of jet will recall current and push downstream to, can weaken aerated cavity backwater.Mainly there are two problems in special-shaped aerator: (1) special-shaped aerator is the three-dimensional aerator developing on two-dimentional aerator basis, build complexity, and difficulty of construction is larger; (2) anti-impact of special-shaped aerator type sudden change place mill ability a little less than, under the effect of high-velocity flow, may produce destruction, form new cavitation source, can not bring into play the effect of air mixing corrosion reducing.
Utility model content
The technical problems to be solved in the utility model is: provide a kind of simple in structure and can prevent the outlet structure escape works air entraining facilities of aerated cavity backwater.
For the technical scheme that addresses the above problem employing is: outlet structure escape works air entraining facilities comprises the outlet structure escape works base plate being obliquely installed, on outlet structure escape works base plate, be provided with aerator, flowing through the cavity forming between the current of jumping up after aerator and outlet structure escape works base plate is aerated cavity; The downstream direction of aerator is provided with structure after the bank that protrudes outlet structure escape works base plates, and after bank, structure comprises first slope nearer apart from aerator and second slope far away apart from aerator; After bank, structure length is greater than aerated cavity length, and the length on the first slope is less than aerated cavity length, first falls within on the second slope after making current flow through aerator; The gradient on the second slope is greater than the gradient of outlet structure escape works base plate and is greater than 0.15.
Further: the first slope and the second slope seamlessly transit.
The beneficial effects of the utility model are: the utility model is applicable to the groove of letting out of Small Bottom Slope, low Fr number, can solve the problem of aerated cavity backwater, have that aeration is effective, a feature of the simple and easy construction of build.The utility model air entraining facilities has made up special-shaped aerator complex structure, the inconvenient deficiency of constructing through hydraulic model verification experimental verification, all can be eliminated backwater in the time of various operation condition, form and stablize cavity, after air vent wind speed, throughput and bank, aeration concentrater meets design requirement.
Brief description of the drawings
Fig. 1 is the utility model outlet structure escape works air entraining facilities structural representation;
Fig. 2 is that prior art is simply connected pattern outlet structure escape works air entraining facilities structural representation;
Fig. 3 is the recessed linking pattern of prior art outlet structure escape works air entraining facilities structural representation;
In figure, be labeled as structure 5 after outlet structure escape works base plate 1, aerator 2, air vent 3, the first slope 4, bank, the second slope 6, aerated cavity 7.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the utility model is further illustrated.
As shown in Figure 1, outlet structure escape works air entraining facilities comprises the outlet structure escape works base plate 1 being obliquely installed, and is provided with aerator 2 on outlet structure escape works base plate 1, and the cavity that flows through formation between the current of jumping up after aerator 2 and outlet structure escape works base plate 1 is aerated cavity 7; The downstream direction of aerator 2 is provided with structure 5 after the bank that protrudes outlet structure escape works base plate 1, and after bank, structure 5 comprises first slope 4 nearer apart from aerator 2 and second slope 6 far away apart from aerator 2; After bank, structure 5 length are greater than aerated cavity 7 length, and the length on the first slope 4 is less than aerated cavity 7 length, first fall within on the second slope 6 after making current flow through aerator 2; The gradient on the second slope 6 is greater than the gradient of outlet structure escape works base plate 1 and is greater than 0.15.
After should avoiding current to cross aerator 2, first fall within on the first slope 4 or outlet structure escape works base plate 1, because the gradient of deflecting nappe impact zone is less under both of these case, can not eliminate aeration backwater.Therefore after bank, structure 5 length are greater than aerated cavity 7 length, and the length on the first slope 4 is less than aerated cavity 7 length, first fall within on the second slope 6 after making current flow through aerator 2, and second slope 6 gradients are larger, can eliminate aeration backwater.
The utility model has to reach with respect to the air entraining facilities of simple structure to be eliminated aeration backwater and keeps two objects of fluid stable.Have with respect to the air entraining facilities of different in nature structure simple in structure, the advantage of constructability.
If the first slope 4 is directly connected with the second slope 6, can form sudden change, easily there is punching worn-off bad, therefore rounding processing should be done in the first slope 4 and 6 junctions, the second slope, and two sections of slopes are seamlessly transitted.
Embodiment:
A kind of outlet structure escape works air entraining facilities comprises the outlet structure escape works base plate 1 being obliquely installed as shown in Figure 1, on outlet structure escape works base plate 1, be provided with aerator 2, the downstream direction of aerator 2 is provided with structure 5 after the bank that protrudes outlet structure escape works base plate 1, after bank, structure 5 comprises first slope 4 nearer apart from aerator 2 and second slope 6 far away apart from aerator 2, aerator 2 is highly 1.5m, and the ratio of aerator height and length is 1:10.Outlet structure escape works base plate 1 gradient is that 0.1039, the first slope 4 gradients are that 0.04, the second slope 6 gradients are 0.2.Outlet structure escape works air entraining facilities also comprises air vent 3, and air vent 3 is communicated with aerated cavity 7 introduces aerated cavity 7 by the air of outlet structure escape works outside.
Claims (2)
1. outlet structure escape works air entraining facilities, comprise the outlet structure escape works base plate (1) being obliquely installed, on outlet structure escape works base plate (1), be provided with aerator (2), flowing through the cavity forming between the current of jumping up after aerator (2) and outlet structure escape works base plate (1) is aerated cavity (7); It is characterized in that: the downstream direction of aerator (2) be provided with protrude outlet structure escape works base plates (1) bank after structure (5), structure after bank (5) comprises first slope (4) nearer apart from aerator (2) and second slope (6) far away apart from aerator (2); Structure after bank (5) length is greater than aerated cavity (7) length, the length on the first slope (4) is less than aerated cavity (7) length, first falls within on the second slope (6) after making current flow through aerator (2); The gradient on the second slope (6) is greater than the gradient of outlet structure escape works base plate (1) and is greater than 0.15.
2. outlet structure escape works air entraining facilities according to claim 1, is characterized in that: the first slope (4) seamlessly transit with the second slope (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420429732.8U CN203977379U (en) | 2014-07-31 | 2014-07-31 | Outlet structure escape works air entraining facilities |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420429732.8U CN203977379U (en) | 2014-07-31 | 2014-07-31 | Outlet structure escape works air entraining facilities |
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| CN203977379U true CN203977379U (en) | 2014-12-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105220662A (en) * | 2015-10-23 | 2016-01-06 | 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 " dovetail bank+subsides slope " aeration method and structure |
| CN110258466A (en) * | 2019-06-28 | 2019-09-20 | 华能澜沧江水电股份有限公司 | Novel air entraining facilities |
-
2014
- 2014-07-31 CN CN201420429732.8U patent/CN203977379U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105220662A (en) * | 2015-10-23 | 2016-01-06 | 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 " dovetail bank+subsides slope " aeration method and structure |
| CN105220662B (en) * | 2015-10-23 | 2017-11-21 | 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 " dovetail bank+patch slope " aeration method and structure |
| CN110258466A (en) * | 2019-06-28 | 2019-09-20 | 华能澜沧江水电股份有限公司 | Novel air entraining facilities |
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