CN113089598A - Vortex chamber inlet structure of rotational flow flood discharging tunnel for improving flow state of water flow - Google Patents
Vortex chamber inlet structure of rotational flow flood discharging tunnel for improving flow state of water flow Download PDFInfo
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- CN113089598A CN113089598A CN202110253379.7A CN202110253379A CN113089598A CN 113089598 A CN113089598 A CN 113089598A CN 202110253379 A CN202110253379 A CN 202110253379A CN 113089598 A CN113089598 A CN 113089598A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/04—Free-flow canals or flumes; Intakes
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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 invention provides a vortex chamber inlet structure of a rotational flow flood discharge tunnel for improving the flow state of water flow, which comprises a diversion tunnel and a vortex chamber, and also comprises a transition section and a water diversion partition wall, wherein the transition section is a connecting section from the diversion tunnel to the vortex chamber, and the water diversion partition wall is arranged on the transition section. According to the vortex chamber inlet structure of the rotational flow flood discharging tunnel for improving the flow state of water flow, provided by the invention, when the water flow passes through the transition section and the water dividing partition wall, the thickness of the rotational water flow in the vortex chamber is increased, the water surface climbing height is greatly reduced, the water surface height difference of the rotational water flow in the vortex chamber is also reduced, and the flow state of the water flow can be improved.
Description
Technical Field
The invention belongs to the technical field of rotational flow energy dissipation of hydraulic and hydroelectric engineering, and particularly relates to a rotational flow flood discharging tunnel volute chamber inlet structure for improving the flow state of water flow.
Background
In the construction of power stations in high mountain canyon areas, a plurality of diversion tunnels are generally required to be constructed, and diversion tunnels with high investment are not economical if used only during dam construction, so that the reconstruction of temporary building diversion tunnels into permanent building flood discharge tunnels is an economical solution, and the adoption of the rotational flow energy dissipation technology is one of important technologies for reconstructing diversion tunnels into flood discharge tunnels.
The rotational flow energy dissipation working principle is that most of water energy is consumed in a flow channel by utilizing the rotational motion of water flow, only partial energy is transferred to the downstream, and the rotational flow energy dissipation working principle has the advantages of high energy dissipation rate, simple structure, flexible arrangement, easiness in ventilation and aeration and the like, and is particularly suitable for high-water-head and large-flow power stations. However, according to engineering practical experience and research progress, although the existing vertical shaft rotational flow flood discharging tunnel can realize relevant functions, with the increase of water head and flow, the flow state of the water flow of the vertical shaft rotational flow flood discharging tunnel is complex, and the problems of large rising height of the water flow of a volute chamber, insufficient downstream energy dissipation and the like occur.
Disclosure of Invention
In order to solve the problems of complex flow state of the existing water flow, large rising height of the water flow of the volute chamber and insufficient downstream energy dissipation, the invention provides the volute chamber inlet structure of the rotational flow flood discharging tunnel for improving the flow state of the water flow.
The technical scheme adopted by the invention is as follows:
the utility model provides an improve whirl flood discharge hole volute chamber import structure of rivers flow regime, includes diversion tunnel and volute chamber, still includes changeover portion and water diversion partition wall, the changeover portion be the linkage segment of diversion tunnel to volute chamber, the water diversion partition wall establish on the changeover portion.
The volute chamber is provided with a vent hole.
The transition section consists of a bottom plate, a first side wall, a second side wall and a top arch, wherein the first side wall and the second side wall are vertically arranged between the bottom plate and the top arch, the bottom plate is obliquely arranged, the first side wall is arranged on the side far away from the vortex chamber, the second side wall is arranged on the side close to the vortex chamber, and the height of the second side wall is changed from the height of the wall of the diversion tunnel to the height of the wall of the vortex chamber; the first side wall and the second side wall respectively comprise a straight line section and an arc section along the water flow direction, and the arc sections of the first side wall and the second side wall are connected with the side wall of the vortex chamber.
The bottom plate is higher at the position of the diversion tunnel than at the position of the vortex chamber.
The slope ratio of the bottom plate is 1: n1, n1 takes 1-10, the distance between the slope point and the central line of the vortex chamber is L1, L1 takes 2-7 times of the diameter of the vortex chamber, and the width D of the bottom plate is the same as the width of the diversion tunnel.
The top arch comprises a straight line section and a slope section, wherein the slope ratio of the slope section is 1: n2, n2 is 0.5-5.
The water diversion partition walls are arranged on the bottom plate of the transition section and are arranged close to the second side wall of the transition section.
The cross section of the water division partition wall is triangular; the water diversion partition wall comprises a water-facing surface, a water-backing surface, a first side surface and a second side surface, wherein the water-facing surface is composed of circular arcs, the radius R1 is (1/30-1/10) D, and the angle of a circular ring is 0-90 degrees; the back water surface consists of straight line segments, the width of each straight line segment is a2, a distance a1 is formed between each straight line segment and a side wall of the transition section is (1/5-1/2), and a distance D between each straight line segment and the side wall of the transition section is (1/3-4/5); the side face I is close to the side wall I of the transition section, the side face II is close to the side wall II of the transition section, the starting points of the side face I and the side face II are respectively two tail ends of an upstream face circular arc, and the end points are respectively two end points of a back face straight line section; the distance between the water back surface of the water diversion partition wall and the vortex chamber is L3, and L3 is (0.5-5) R, wherein R is the radius of the vortex chamber; the length of the water diversion partition wall along the water flow is L2, and the L2 is 0.5-5D; d is the width of the bottom plate.
The invention has the beneficial effects that:
according to the vortex chamber inlet structure of the rotational flow flood discharging tunnel, provided by the invention, water flow passes through the transition section and the water dividing partition wall, the thickness of the rotating water flow in the vortex chamber is increased, the water surface climbing height is greatly reduced, the water surface height difference of the rotating water flow in the vortex chamber is also reduced, and the flow state of the water flow can be improved.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a transverse cross-sectional view of the present invention.
In the figures, the reference numbers are: 1. a water diversion section; 2. a volute chamber; 3. a transition section; 4. a water diversion partition wall; 5. a base plate; 6. a top arch; 7. a first side wall; 8. a second side wall; 9. a vent hole; 10. a shaft; 11. a shaft connecting section.
Detailed Description
Example 1:
in order to solve the problems of complex flow state of the existing water flow, large rising height of the water flow of the volute chamber and insufficient downstream energy dissipation, the invention provides the vortex chamber inlet structure of the vortex flood discharging tunnel for improving the flow state of the water flow, which is shown in the figure 1-2.
The utility model provides an improve whirl flood discharge hole volute chamber import structure of rivers flow state, includes diversion tunnel 1 and volute chamber 2, still includes changeover portion 3 and divides water partition wall 4, changeover portion 3 be diversion tunnel 1 to volute chamber 2's linkage segment, divide water partition wall 4 establish on changeover portion 3.
According to the invention, the transition section 3 and the water dividing partition wall 4 are arranged, water flows pass through the transition section 3 and the water dividing partition wall 4, the thickness of the rotating water flow in the volute chamber 2 is increased, the water surface climbing height is greatly reduced, the water surface height difference of the rotating water flow in the volute chamber 2 is also reduced, and the flow state of the water flow can be improved.
The water dividing partition wall 4 is positioned close to the vortex chamber 2 side, and aims to divide water flow into unequal water flow on two sides to form main water flow and auxiliary water flow. The main flow far away from the side of the vortex chamber 2 adopts small-angle contraction, so that the main flow far away from the side of the vortex chamber 2 and entering the vortex chamber 2 can be accelerated to impact the water blocking effect of the rotary flow of the vortex chamber 2; the large-angle contraction and guide mode is adopted near the vortex chamber 2, so that the secondary flow and the outer rotary flow can be staggered and collided, and the impact and back choking phenomena of the outer rotary main flow on the main flow entering the vortex chamber are relieved. The top of the volute chamber 2 is a spherical body, the vertical shaft 10 is a circular section, the top of the vertical shaft 10 is provided with an inclined slope, the section is contracted, the diameter of the vertical shaft 10 is smaller than that of the volute chamber 2, the lower part of the volute chamber 2 is connected with the vertical shaft 10 through a vertical shaft connecting section 11, and the vertical shaft connecting section 11 is large in upper part and small in lower part to communicate the volute chamber 2 with the vertical shaft 10.
Example 2:
based on the embodiment 1, in this embodiment, preferably, the transition section 3 is composed of a bottom plate 5, a first side wall 7, a second side wall 8 and a top arch 6, the first side wall 7 and the second side wall 8 are vertically arranged between the bottom plate 5 and the top arch 6 from the outside to the inside, the bottom plate 5 is arranged in an inclined manner, the first side wall 7 is arranged on the side far away from the volute chamber 2, the second side wall 8 is arranged on the side close to the volute chamber 2, and the height of the first side wall and the height of the second side wall are respectively the wall height from the side wall of the diversion tunnel 1 to the volute chamber 2; the first side wall 7 and the second side wall 8 respectively comprise a straight line section and an arc section along the water flow direction, and the arc sections of the first side wall 7 and the second side wall 8 are connected with the side wall of the vortex chamber 2. The section of the transition section 3 is horseshoe-shaped.
Preferably, the bottom plate 5 is higher at the position of the water tunnel 1 than at the position of the vortex chamber 2.
Preferably, the slope ratio of the bottom plate 5 is 1: n1, n1 takes 1-10, the distance between the slope point and the central line of the vortex chamber 2 is L1, L1 takes 2-7 times of the diameter of the vortex chamber 2, and the width D of the bottom plate 5 is the same as the width of the diversion tunnel 1.
Preferably, the top arch 6 comprises a straight line section and a slope section, and the slope ratio of the slope section is 1: n2, n2 is 0.5-5.
Preferably, the water dividing partition wall 4 is arranged on the bottom plate 5 of the transition section 3 and close to the second side wall 8 of the transition section 3.
The slope ratio values are comprehensively considered by combining the length of the transition section 3 and the height of the cavern, so that the section height of the opening entering the volute 2 is enlarged, the upper space of a water flow surface is enlarged, the pressure of water flow on the cavern wall is reduced, the water flow form is favorable, and the safety of the cavern structure is favorable
Preferably, the cross section of the water dividing partition wall 4 is triangular; the water diversion partition wall 4 comprises a water-facing surface, a water-backing surface, a first side surface and a second side surface, wherein the water-facing surface is composed of circular arcs, the radius R1 is 1/30-1/10D, and the angle of a circular ring is 0-90 degrees; the back water surface consists of straight line segments, the width of each straight line segment is a2, 1/5-1/2D is taken, a distance a1 is reserved between each straight line segment and the side wall of the transition section 3, and 1/3-4/5D is taken; the first side face is close to the first side wall 7 of the transition section 3, the second side face is close to the second side wall 8 of the transition section 3, the initial points of the first side face and the second side face are two tail ends of an upstream face circular arc respectively, and the end points are two end points of a back face straight line segment respectively; the distance between the back surface of the water division partition wall 4 and the vortex chamber 2 is L3, and L3 is 0.5-5R, wherein R is the radius of the vortex chamber 2; the length of the water diversion partition wall 4 along the water flow is L2, and the L2 is 0.5-5D; d is the width of the bottom plate 5.
Preferably, the volute chamber 2 is provided with a plurality of vent holes 9. The vent holes 9 are arranged on the crown arch, the positions of the vent holes do not have special requirements, and 1% -10% of the cross section area of the vertical shaft 10 is considered according to the experience.
A plurality of water flow tests show that the proper water division partition wall 4 is additionally arranged in the hydraulic jump area at the tail end of the diversion tunnel 1, so that the water level of the volute chamber is effectively reduced, the influence of the revolving water flow on the main flow can be reduced, the water flow inside the partition pier carries out top impact and inhibition on the revolving water flow of the volute chamber 2, and the water flow outside the partition pier can smoothly enter the volute chamber 2. The water dividing partition wall 4 divides the water flow into unequal water flows on two sides to form a main water flow and an auxiliary water flow. The main flow far away from the side of the vortex chamber 2 adopts small-angle contraction, so that the main flow far away from the side of the vortex chamber 2 and entering the vortex chamber 2 can be accelerated to impact the water blocking effect of the rotary flow of the vortex chamber 2; the large-angle contraction and guide mode is adopted near the vortex chamber 2, so that the secondary flow and the outer rotary flow are staggered and collided, and the impact and back choking phenomena of the outer rotary main flow on the main flow entering the vortex chamber are relieved. In addition, the connection section of the water diversion tunnel 1 to the volute chamber 2 is formed into a slope, which can cause the flow velocity of water entering the volute chamber 2 to increase.
According to the invention, water flows pass through the transition section 3 and the water diversion partition wall 4, the thickness of the rotating water flow in the volute chamber 2 is increased, the water surface climbing height is greatly reduced, the water surface height difference of the rotating water flow in the volute chamber 2 is also reduced, and the flow state of the water flow can be improved.
Example 3:
based on the embodiment 1 or 2, in this embodiment, preferably, the thickness of the first side wall 7 is 50 cm; the width D of the bottom plate 5 is 700cm, the slope ratio of the bottom plate 5 is 1: 5.7, the slope ratio of the top arch 6 slope segment is 1: 3.5, the radius R of the volute chamber 2 is 675cm, the distance a1 between the back water surface and the first side wall 7 of the transition section 3 is 350cm, the width a2 of the back water surface is 300cm, the radius R1 of the circular arc of the upstream surface is 150cm, the distance d1 between the first side surface and the first side wall 7 is 430cm, the distance d2 between the second side surface and the second side wall 8 is 220cm, the distance d3 between the central axis of the upstream surface and the second side wall 8 is 230 cm, the distance L1 from the slope starting point of the bottom plate 5 to the central line of the volute chamber 2 is 4220cm, the downstream length L2 of the water diversion partition wall 4 is 1005cm, and the distance L3 from the back water surface of the water diversion partition wall 4 to the volute chamber 2 is 1320 cm; the straight-line distance from the starting point of the water dividing wall 4 to the starting point of the transition section is 1895 cm.
According to the vortex chamber inlet structure of the rotational flow flood discharge tunnel for improving the flow state of water, which is obtained by the design of the size, multiple tests prove that water flows through the transition section 3 and the water diversion partition wall 4, the thickness of the rotational water flow in the vortex chamber 2 is increased, the climbing height of the water surface is greatly reduced, the height difference of the water surface of the rotational water flow in the vortex chamber 2 is also reduced, and the flow state of water can be improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention. The device structure and the system method which are not described in detail in the invention are the prior art, and the further description is not provided in the invention.
Claims (8)
1. The utility model provides an improve whirl flood discharge hole volute chamber import structure of rivers flow state, includes diversion tunnel (1) and volute chamber (2), its characterized in that: the water diversion and water distribution device is characterized by further comprising a transition section (3) and a water diversion partition wall (4), wherein the transition section (3) is a connecting section from the diversion tunnel (1) to the volute chamber (2), and the water diversion partition wall (4) is arranged on the transition section (3).
2. The vortex chamber inlet structure of the rotational flow spillway tunnel for improving the flow state of water according to claim 1, wherein: the volute chamber (2) is provided with a plurality of vent holes (9).
3. The vortex chamber inlet structure of the rotational flow spillway tunnel for improving the flow state of water according to claim 1, wherein: the transition section (3) is composed of a bottom plate (5), a first side wall (7), a second side wall (8) and a top arch (6), the first side wall (7) and the second side wall (8) are vertically arranged between the bottom plate (5) and the top arch (6) from inside to outside, the bottom plate (5) is obliquely arranged, the first side wall (7) is arranged on the side far away from the volute chamber (2), the second side wall (8) is arranged on the side close to the volute chamber (2), and the height of the first side wall and the height of the second side wall are respectively transited from the side wall of the diversion tunnel (1) to the wall height of the volute chamber (2); the side wall I (7) and the side wall II (8) respectively comprise a straight line section and an arc section along the water flow direction, and the arc sections of the side wall I (7) and the side wall II (8) are connected with the side wall of the vortex chamber (2).
4. The vortex chamber inlet structure of the rotational flow spillway tunnel for improving the flow state of water according to claim 1, wherein: the volute chamber (2) is provided with a vent hole (9).
5. The vortex chamber inlet structure of the rotational flow spillway tunnel for improving the flow state of water according to claim 3, wherein: the slope ratio of the bottom plate (5) is 1: n1, n1 takes 1-10, the distance between the slope point and the central line of the vortex chamber (2) is L1, L1 takes 2-7 times of the diameter of the vortex chamber (2), and the width D of the bottom plate (5) is the same as the width of the diversion tunnel (1).
6. The vortex chamber inlet structure of the rotational flow spillway tunnel for improving the flow state of water according to claim 3, wherein: the top arch (6) comprises a straight line section and a slope section, wherein the slope ratio of the slope section is 1: n2, n2 is 0.5-5.
7. The vortex chamber inlet structure of the rotational flow spillway tunnel for improving the flow state of water according to claim 1, wherein: the water diversion partition walls (4) are arranged on the bottom plate (5) of the transition section (3) and are arranged close to the second side wall (8) of the transition section (3).
8. The vortex chamber inlet structure of the rotational flow spillway tunnel for improving the flow state of water according to claim 1, wherein: the section of the water division partition wall (4) is triangular; the water diversion partition wall (4) comprises a water-facing surface, a water-backing surface, a first side surface and a second side surface, wherein the water-facing surface consists of circular arcs, the radius R1 is (1/30-1/10) D, and the angle of the circular ring is 0-90 degrees; the back water surface consists of straight line segments, the width of the back water surface is a2, (1/5-1/2) D, (1/3-4/5) D, and the distance a1 between the back water surface and the side wall (7) of the transition section (3) is adopted; the first side wall (7) is close to the transition section (3), the second side wall (8) is close to the transition section (4), the initial points of the first side wall and the second side wall are two tail ends of the upstream surface circular arc respectively, and the end points are two end points of the back surface straight line segment respectively; the distance between the back surface of the water division partition wall (4) and the vortex chamber (2) is L3, and L3 is 0.5-5R, wherein R is the radius of the vortex chamber (2); the length of the water diversion partition wall (4) along the water flow is L2, and the length of L2 is 0.5-5D; d is the width of the bottom plate (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110253379.7A CN113089598B (en) | 2021-03-09 | 2021-03-09 | Vortex chamber inlet structure of vortex flood discharge tunnel for improving flow state of water flow |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110253379.7A CN113089598B (en) | 2021-03-09 | 2021-03-09 | Vortex chamber inlet structure of vortex flood discharge tunnel for improving flow state of water flow |
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| CN113089598B CN113089598B (en) | 2022-07-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007177395A (en) * | 2005-12-26 | 2007-07-12 | Chugoku Electric Power Co Inc:The | Energy dissipation works of spillway water flow and energy dissipation method |
| CN106930249A (en) * | 2017-04-17 | 2017-07-07 | 四川大学 | A kind of taper volute chamber rotational flow silo flood discharging tunnel system |
| CN110424343A (en) * | 2019-07-12 | 2019-11-08 | 四川大学 | A kind of rotational flow silo flood discharging tunnel with volute chamber aerated bank |
-
2021
- 2021-03-09 CN CN202110253379.7A patent/CN113089598B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007177395A (en) * | 2005-12-26 | 2007-07-12 | Chugoku Electric Power Co Inc:The | Energy dissipation works of spillway water flow and energy dissipation method |
| CN106930249A (en) * | 2017-04-17 | 2017-07-07 | 四川大学 | A kind of taper volute chamber rotational flow silo flood discharging tunnel system |
| CN110424343A (en) * | 2019-07-12 | 2019-11-08 | 四川大学 | A kind of rotational flow silo flood discharging tunnel with volute chamber aerated bank |
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