CN217784544U - Bend of pressure water delivery pipeline - Google Patents
Bend of pressure water delivery pipeline Download PDFInfo
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- CN217784544U CN217784544U CN202221494794.8U CN202221494794U CN217784544U CN 217784544 U CN217784544 U CN 217784544U CN 202221494794 U CN202221494794 U CN 202221494794U CN 217784544 U CN217784544 U CN 217784544U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model discloses a there is conduit bend of pressure, it is including the upper reaches straight section that connects gradually, expand the section suddenly, low reaches straight section, the outside and the inboard outside extension formation extension region in the same direction as the outside of straight section and low reaches straight section in the same direction as the relative upper reaches respectively of the outside and the inboard that expand suddenly the section of expanding the section, the pipeline sectional area who makes the upper reaches in the same direction as straight section exit is less than the pipeline sectional area who expands the section import department suddenly, the pipeline sectional area of low reaches in the same direction as straight section import department is less than the pipeline sectional area who expands the section exit suddenly, and the exit end of upper reaches straight section expands suddenly with the entrance point that expands the section suddenly and is connected, the exit end that expands suddenly is connected with the entrance point sudden shrinkage of low reaches straight section. The utility model discloses can improve the interior rivers cross section velocity of flow distribution of pressure return bend, reduce the pumped storage power station and advance/delivery port divergent section rivers bias flow phenomenon, satisfy adjacent runner flow distribution ratio and trash rack section and cross design index requirements such as grid velocity of flow.
Description
Technical Field
The utility model relates to a hydroelectric power generation engineering hydraulics category, especially a have pressure conduit bend.
Background
With the rapid development of renewable energy sources such as onshore wind power, offshore wind power, solar power stations and the like and the steady promotion of nuclear power station construction, the pumped storage power station is an indispensable important component part in the power system as an important measure for improving the operation efficiency of the power system and ensuring the operation safety of the nuclear power station. The water delivery system of the pumped storage power station generally comprises an upstream water inlet/outlet, a pressure water delivery pipeline and a downstream water inlet/outlet. Due to the limitations of engineering geological conditions, the overall arrangement of the hub buildings, construction conditions, engineering investment and the like, the water conveying pipeline is usually connected with the upstream and downstream water conveying pipelines by using bends (see fig. 1).
The motion characteristics of the water flow in the curve are greatly different from those of the straight water flow, the water particles are influenced by centrifugal force and inertia force besides the action of gravity, the water flow has the tendency of extruding towards the concave bank (outer side) of the curve to generate radial flow and vertical flow, and secondary spiral flow is formed by superposition of the radial flow and the vertical flow, the flow velocity of the concave bank (outer side) of the curve is obviously higher than that of the convex bank (inner side) of the curve, the flow velocity of the cross section of the curve is unevenly distributed, and the non-uniform flow/bias flow characteristics are obviously realized. Particularly, when the curve is close to the water inlet/outlet of the power station and non-uniform flow enters/flows out of the water inlet/outlet, the design indexes such as the flow distribution ratio of adjacent runners, the cross-sectional flow velocity of the trash rack and the like cannot meet the requirements of regulation specifications. Through analysis and research on the phenomenon of drift of water inlets/water outlets of a large number of pumped storage power stations, the fact that the flow velocity distribution of the cross section of water flow in a curve is uneven is an important reason for the drift.
At present, the method for improving the flow state of water flow at an open channel bend usually arranges a special structure in a discharge chute, changes the flow direction and the water surface elevation of the bend water flow by using the guiding and controlling function of the structure, and comprises the following main structures: the bottom plate is transversely ultrahigh, and the bottom plate guide wall/baffle bank, the diversion pier, the spur dike and the like are adopted, but the guide and control measures basically do not have the function of improving the flow velocity distribution of the water flow cross section of the curved channel, are specific to a certain specific project and an open channel curved channel, have no universality and are difficult to popularize and apply.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, it is uneven to have the pressure conduit bend rivers cross section velocity of flow distribution to current pumped storage power station, easily the not enough of rivers bias current phenomenon appear advancing/delivery port diffuser, the utility model provides a can improve bend rivers cross section velocity of flow distribution, reduce pumped storage power station and advance/delivery port diffuser rivers bias current phenomenon, satisfy adjacent runner flow distribution ratio and trash rack cross section design index's such as bars velocity of flow pumped storage power station and press conduit bend.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a pressure water pipe bend comprises an upstream straight section, a sudden expansion section and a downstream straight section which are connected in sequence, wherein the outer side and the inner side of the sudden expansion section are respectively outwards expanded relative to the outer side and the inner side of the upstream straight section and the downstream straight section to form an expansion area, so that the area of the cross section of a pipeline at an outlet of the upstream straight section is smaller than that of a pipeline at an inlet of the sudden expansion section, the area of the cross section of a pipeline at an inlet of the downstream straight section is smaller than that of a pipeline at an outlet of the sudden expansion section, the outlet end of the upstream straight section is connected with the inlet end of the sudden expansion section in a sudden expansion mode, and the outlet end of the sudden expansion section is connected with the inlet end of the downstream straight section in a sudden contraction mode.
The utility model discloses the mode that utilizes conduit bend wall to expand suddenly (expand suddenly) and contract suddenly (reduce suddenly) has broken the bend outside and has flowed the continuity of wall, make it become discontinuous curved surface, the continuity in original flow field has been disturbed, thereby make rivers have the trend that pressure reduces suddenly expanding section inboard (convex bank), weaken rivers to expanding section outside (concave bank) extruded trend suddenly, make the radial velocity of flow of original straight bend, vertical velocity of flow all receives the suppression of great degree, secondary spiral flow structure reduces by a wide margin. Meanwhile, the shearing, entrainment and mixing functions of the water flow in the expansion area of the sudden expansion section are enhanced, so that the flow velocity of the outer side (concave bank) of the bend is reduced, and the distribution uniformity of the flow velocity of the cross section is obviously improved.
Preferably, the cross section of the sudden expansion section is an elliptic curve, the outer curve and the inner curve of the sudden expansion section adopt different elliptic curve equations, the semi-major axis of the outer elliptic curve is greater than the semi-major axis of the inner elliptic curve, and the semi-minor axis of the outer elliptic curve is equal to the semi-minor axis of the inner elliptic curve.
Preferably, the diameter of the upstream straight section is the same as the diameter of the downstream straight section.
Preferably, the outer curve of the sudden expansion section meets the following requirements:
(1) Pipeline central plane sudden-expansion section outer expansion radius
(2) Pipeline central plane sudden-expansion section outer expansion width
(3) External oval major semi-axis of cross section of sudden expansion section
(4) Short semi-axis of ellipse outside cross section of sudden expansion section
(5) Area of outer expansion region of sudden expansion section
The inner curve of the sudden expansion section meets the following requirements:
(1) Pipe central plane sudden expansion section inner side expansion radius
(2) Pipeline central plane sudden expansion section inner side expansion width
(3) Cross section of the sudden expansion section has an inner oval lengthHalf shaft
(4) The minor semi-axis b = D/2 of the ellipse at the inner side of the cross section of the sudden expansion section,
(5) Area of expansion region inside sudden expansion section
Wherein D is the diameter of the straight pipeline, R is the turning radius of the central line of the curve, and alpha is the central angle of the curve.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses the mode that utilizes the wall to expand suddenly and contract suddenly has broken the bend outside and has flowed through the continuity of wall, makes it become discontinuous curved surface, has disturbed the continuity in original flow field, and original radial velocity of flow, the vertical velocity of flow in the same direction as straight bend all receive the suppression of great degree, and secondary spiral flow structure reduces by a wide margin.
2. The utility model discloses utilize the shearing, the entrainment of expanding the regional rivers suddenly, the mixing effect reinforcing, make the bend outside/concave bank velocity of flow reduce, the cross section velocity of flow distribution homogeneity is showing and is improving.
3. The utility model discloses simple structure, adaptability are good, the effect is obvious.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic plan view of a bent pipeline of a pressure water delivery pipeline of a conventional pumped storage power station.
Fig. 2 is the plane schematic diagram of the pressure water pipe bend of the pumped storage power station of the present invention.
Fig. 3 isbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of fig. 2.
Fig. 4 is a cross-sectional view B-B of fig. 2.
FIG. 5 is a cross-sectional view of an expanded region of the sudden expansion segment.
The main elements in the figures are illustrated with reference numbers:
1-outside of water pipe (concave bank); 11-outside the upstream straight section; 12-a concave bank (outer side) of the sudden expansion section of the curve; 13-outside the downstream straight section; 2-water pipe convex bank (inner side); 21-inside of upstream straight section; 22-inside of the sudden expansion section of the bend (convex bank); 23-inside the downstream straight section.
D-diameter of the water delivery pipeline; r-the turning radius of the center line of the curve; alpha-bend central angle;
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
For convenience of description, the relative positional relationship of the components, such as: the descriptions of the upper, lower, left, right, etc. are described with reference to the layout directions of the drawings in the specification, and do not limit the structure of the present patent.
As shown in fig. 2-5, the utility model discloses pumped storage power station has pressure conduit bendOne embodiment comprises an upstream straight section, a sudden expansion section and a downstream straight section which are connected in sequence. The diameters of the upstream straight section and the downstream straight section are the same, and the outer side 12 of the sudden expansion section expands outwards relative to the outer side 11 of the upstream straight section and the outer side 13 of the downstream straight section to form a first expansion area S 1 The inner side 22 of the sudden expansion section is respectively expanded outwards relative to the inner side 21 of the upstream straight section and the inner side 23 of the downstream straight section to form a second expansion area S 2 That is, the outlet end of the upstream straight section is connected with the inlet end of the sudden expansion section in a sudden expansion manner, and the outlet end of the sudden expansion section is connected with the inlet end of the downstream straight section in a sudden contraction manner, so that the cross section area of the pipeline entering the sudden expansion section of the upstream straight section is suddenly enlarged, and the cross section area of the pipeline entering the downstream straight section of the sudden expansion section is suddenly reduced.
In this embodiment, the utility model discloses pumped storage power station has pressure conduit bend sudden enlargement structure to see figure 2, and the cross section of the straight section of upper reaches or low reaches, sudden enlargement section cross section, the regional cross section of sudden enlargement section extension are seen in figure 3 ~ figure 5 respectively. As shown in FIG. 4, the cross section (cross section) of the sudden expansion section is an elliptic curve, the outer curve and the inner curve of the sudden expansion section adopt different elliptic curve equations, and the major semiaxis a of the outer elliptic curve 1 Longer semi-axis a larger than the inner elliptic curve 2 The minor semi-axis b of the outer elliptic curve is equal to the minor semi-axis b of the inner elliptic curve.
Given that the diameters of the upstream straight section and the downstream straight section are D, the turning radius of the central line of the curve is R, and the central angle of the curve is alpha, the outer curve of the sudden expansion section meets the following requirements:
(1) Pipeline central plane sudden-expansion section outer expansion radius
(2) Pipeline central plane sudden-expansion section outer expansion width
(3) Oval major semi-axis outside cross section of sudden expansion section
(4) Short semi-axis of ellipse outside cross section of sudden expansion section
(5) Area of outer expansion region of sudden expansion section
The inner curve of the sudden expansion section meets the following requirements:
(1) Pipe central plane sudden expansion section inner side expansion radius
(2) Pipeline central plane sudden-expansion section inner side expansion width
(3) Oval major semi-axis in cross section of sudden expansion section
(4) The minor semi-axis b = D/2 of the ellipse at the inner side of the cross section of the sudden expansion section,
(5) Area of expansion region inside sudden expansion section
The utility model discloses pumped storage power station has pressure conduit bend to expand structure result of use suddenly and verifies:
1 side type water inlet/outlet is arranged on an upper reservoir of a certain pumped storage power station, a 3-partition 4-hole pipeline is adopted, the diameter D of a water pipeline is 9m, the bottom slope is 5%, a plane bending section is arranged at a position 0+104.847m of a water diversion main hole with a pipeline pile number, the turning radius R of the central line of the bending section is 40m, and the central angle a of the bending section is 39.2675 degrees. The runners of the water inlet/outlet are sequentially numbered as (1) a runner, (2) a runner, (3) a runner and (4) a runner from left to right according to the inflow direction, wherein the runner (1) is a runner close to the inner side (convex bank) of a bent section, (2) the runner (3) is a middle runner, and the runner (4) is a runner close to the outer side (concave bank) of the bent section, and are found through a hydraulics model test: under the working condition of pumping water of 4 machines with low water level, the flow distribution ratio of the (1) to (4) flow channels is 0.62: 0.72: 1.27: 1.40 in sequence; the flow distribution ratio of the flow passages (1) to (4) under the water pumping operation working condition of the 4 machines with high water level is 0.59: 0.82: 1.28: 1.30 in sequence, and the flow distribution ratio shows that the flow distribution of the flow passages (1) and (2) is less; (3) and (4) the flow distribution of the flow channels is large, and the requirement of the specification that the flow distribution of each adjacent flow channel is not more than 10 percent is not met.
According to the utility model provides a design method calculates the structure size of bend sudden expansion section, seeks: outside expansion radius of pipeline central plane sudden expansion section
Pipeline central plane sudden-expansion section outer expansion width d 1 =2.75m; external ellipse major semi-axis a of cross section of sudden expansion section 1 =7.25m; the minor semiaxis b =4.5m of the ellipse at the inner side of the cross section of the sudden expansion section; area S of outer expansion region of sudden expansion section 1 ＝19.42m 2 (ii) a Pipe central plane sudden expansion section inner side expansion radius
Pipeline central plane sudden-expansion section inner side expansion width d 2 =2.06m; major semi-axis a of ellipse at inner side of cross section of sudden expansion section 2 =6.56m; the minor semi-axis of the outer ellipse of the cross section of the sudden expansion section or the minor semi-axis of the inner ellipse of the cross section of the sudden expansion section b =4.5m; area S of expansion region at inner side of sudden expansion section 2 ＝14.59m 2 . Then, the curve of the pressure water pipeline of the utility model is designed according to the obtained data, and the two groups of running working conditions with the same flow and different water levels are selected for testing, the flow distribution ratio is between 0.87 and 1.12 under the low water level, and the maximum average flow velocity of the section of the trash rack is 0.81m/s; the flow distribution ratio under high water level is between 0.85 and 1.09, the maximum average flow velocity of the cross section of the trash rack is 0.79m/s, and the design index meets the requirement of the regulation specification. It can be seen that the utility model provides a bend suddenly expands the structure and is showing that to improve into/the adjacent runner flow distribution ratio of delivery port diffuser section, trash rack cross-section flowsAnd (4) speed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art can utilize the technical content disclosed above to make many possible variations and modifications to the technical solution of the present invention, or to modify equivalent embodiments with equivalent variations, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. A pressure water pipe bend is characterized by comprising an upstream straight section, a sudden expansion section and a downstream straight section which are connected in sequence, wherein the outer side and the inner side of the sudden expansion section are respectively outwards expanded relative to the outer side and the inner side of the upstream straight section and the downstream straight section to form an expansion area, so that the sectional area of a pipeline at an outlet of the upstream straight section is smaller than that of a pipeline at an inlet of the sudden expansion section, the sectional area of a pipeline at an inlet of the downstream straight section is smaller than that of a pipeline at an outlet of the sudden expansion section, the outlet end of the upstream straight section is connected with the inlet end of the sudden expansion section in a sudden expansion mode, and the outlet end of the sudden expansion section is connected with the inlet end of the downstream straight section in a sudden contraction mode.
2. A pressure water pipe bend according to claim 1, wherein the cross-section of the sudden expansion section is an elliptic curve, the outer curve and the inner curve of the sudden expansion section adopt different elliptic curve equations, the major semi-axis of the outer elliptic curve is larger than the major semi-axis of the inner elliptic curve, and the minor semi-axis of the outer elliptic curve is equal to the minor semi-axis of the inner elliptic curve.
3. A curved pressure water pipe according to claim 2, wherein:
the outer curve of the sudden expansion section meets the following requirements:
(1) Pipeline central plane sudden-expansion section outer expansion radius
(2) Pipeline central plane sudden expansion section outer expansion width
(3) Oval major semi-axis outside cross section of sudden expansion section
(4) Short semi-axis of outer ellipse of cross section of sudden expansion section
(5) Area of outer expansion region of sudden expansion section
The inner curve of the sudden expansion section meets the following requirements:
(1) Pipe central plane sudden expansion section inner side expansion radius
(2) Pipeline central plane sudden-expansion section inner side expansion width
(3) Oval major semi-axis in cross section of sudden expansion section
(4) The minor semi-axis b = D/2 of the ellipse at the inner side of the cross section of the sudden expansion section,
(5) Area of inner expansion area of sudden expansion section
Wherein D is the diameter of the straight pipeline, R is the turning radius of the central line of the curve, and alpha is the central angle of the curve.
4. A pressured water conduit bend according to claim 1, wherein the upstream straight section has the same pipe diameter as the downstream straight section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221494794.8U CN217784544U (en) | 2022-06-13 | 2022-06-13 | Bend of pressure water delivery pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221494794.8U CN217784544U (en) | 2022-06-13 | 2022-06-13 | Bend of pressure water delivery pipeline |
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| CN217784544U true CN217784544U (en) | 2022-11-11 |
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| CN202221494794.8U Active CN217784544U (en) | 2022-06-13 | 2022-06-13 | Bend of pressure water delivery pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960571A (en) * | 2022-06-13 | 2022-08-30 | 中国电建集团中南勘测设计研究院有限公司 | Pressure water delivery pipeline bend sudden-expansion structure of pumped storage power station |
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- 2022-06-13 CN CN202221494794.8U patent/CN217784544U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960571A (en) * | 2022-06-13 | 2022-08-30 | 中国电建集团中南勘测设计研究院有限公司 | Pressure water delivery pipeline bend sudden-expansion structure of pumped storage power station |
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