CN213981024U - Tubular turbine for improving draft tube pressure pulsation - Google Patents
Tubular turbine for improving draft tube pressure pulsation Download PDFInfo
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- CN213981024U CN213981024U CN202022798980.8U CN202022798980U CN213981024U CN 213981024 U CN213981024 U CN 213981024U CN 202022798980 U CN202022798980 U CN 202022798980U CN 213981024 U CN213981024 U CN 213981024U
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- draft tube
- hub body
- end surface
- guide vane
- water inlet
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- 230000010349 pulsation Effects 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000009792 diffusion process Methods 0.000 claims abstract description 23
- 230000001629 suppression Effects 0.000 claims description 31
- 210000004690 animal fin Anatomy 0.000 abstract description 3
- 230000000737 periodic effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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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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- Hydraulic Turbines (AREA)
Abstract
The utility model discloses a tubular turbine for improving the pressure pulsation of a draft tube, which comprises a water inlet flow passage, wherein one end close to the water inlet flow passage is sequentially communicated with a guide vane, a rear guide vane, a draft tube diffusion section and a draft tube extension section; a hub body is also distributed along the direction of a central shaft of the water inlet flow passage, and the other end of the hub body extends to the tail water pipe diffusion section; the hub body is fixed in the water inlet flow channel through the buttress, and the surface of the hub body is still fixed with round stator respectively, round can follow the rotatory runner blade of hub body and the rearmounted stator of round, and the draft tube is arranged behind the rearmounted stator, is provided with in the draft tube and presses down whirlpool device, including what arrange on the whole draft tube inner wall presses down whirlpool spiral arch and fixed on the draft tube diffuser section inner wall along the whirlpool fish fin boss of draft tube diffuser section center pin direction. Through setting up and pressing down whirlpool device and rearmounted stator, can improve the periodic pressure pulsation that acts on the draft tube runner wall, and then improved through-flow turbine operating stability.
Description
Technical Field
The utility model belongs to the technical field of the hydraulic turbine is made, concretely relates to improve draft tube pressure pulsation's through-flow turbine.
Background
With the implementation of national energy strategy, our country pays more and more attention to the utilization and development of clean energy. Among them, tidal energy has received attention from many experts and scholars as a clean and efficient energy source. In the process of developing and utilizing tidal energy, the turbine is one of the main units for converting tidal energy into electric energy, so that intensive research on the turbine is essential. The through-flow turbine has the advantages of low water head, large overflow, high efficiency, large specific speed, small hydraulic loss and the like. However, in the process of the operation of the tubular turbine, as the bulb body of the turbine set is in flowing water and is easily affected by the action of hydraulic excitation force, the pressure pulsation forming the flow field periodically acts on the wall surface of the draft tube flow passage and the rotating wheel to cause the vibration of the structure and the components, thereby generating great harm to the stability of the operation of the turbine set. Therefore, it is important to intensively study the draft tube pressure pulsation and improve the influence of the pressure pulsation on the operation stability of the water turbine.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a tubular turbine for improving draft tube pressure pulsation, which solves the problem that the tubular turbine is easy to be influenced by the action of the hydraulic shock excitation force because a bulb body of a set is positioned in flowing water in the operation process of the tubular turbine in the prior art, and the formed pressure pulsation periodically acts on the wall surface of a draft tube runner to cause the vibration of the set; thereby improving the running stability of the through-flow turbine.
The technical scheme adopted by the utility model is that the through-flow turbine for improving the pressure pulsation of the draft tube comprises a water inlet flow channel, wherein one end close to the water inlet flow channel is sequentially communicated with a guide vane, a runner chamber, a draft tube diffusion section and a draft tube extension section; a hub body is also distributed along the direction of the central shaft of the water inlet flow passage and extends to the tail water pipe diffusion section; the hub body is fixed in the water inlet flow passage through the buttress, the guide vane is fixed on the outer surface of the hub body, a circle of runner blades are arranged along the circumferential direction of the hub body in a rotating mode, and the rear guide vane 5 is arranged on the hub body in a manner of being close to the runner blades; be provided with in the draft tube and press down the whirlpool device, press down the whirlpool device including pressing down the protruding and fin form of whirlpool fin boss of whirlpool, press down the whirlpool fin boss and fix on the draft tube diffuser section inner wall along the center pin direction, press down the protruding semicylindrical protruding structure that distributes in whole draft tube of whirlpool along the center pin direction of whirlpool spiral.
The utility model is also characterized in that,
the vortex suppression devices are 4 in total and are uniformly distributed on the inner wall of the tail water pipe.
The bulge is in a semi-cylindrical shape with the radius of r, and the relation between the r and the height H of the boss of the vortex suppressing fish fin is that r is 1/2H; the relationship between the helical pitch S and the radius r of the projection is S2 r and the helix angle α is 5 °.
Every presses down lamellar structure that whirlpool fin boss comprises two upper and lower terminal surfaces, and two terminal surfaces are the ellipse, and the up end area is less than terminal surface down, presses down the lower terminal surface of whirlpool fin boss and closely laminates with draft tube diffuser inner wall, and the up end major axis is arranged with hydraulic turbine central axis parallel.
The relation between the length a of the elliptic major semi-axis of the upper end surface of the vortex suppression fin boss and the length L of the draft tube diffusion section is 1/6L, the relation between the length B of the minor semi-axis and the length L of the draft tube diffusion section is 1/12L, the length A of the elliptic major semi-axis of the lower end surface and the length B of the elliptic minor semi-axis of the lower end surface are respectively 2 times of the length of the major semi-axis of the upper end surface and the length of the minor semi-axis of the lower end surface, and the axial distance between the center of the upper end surface and the center of the lower end surface is a.
The relation between the distance H from the upper end surface of the vortex suppression fin boss to the central axis of the water turbine and the radius R of the cross section of the diffusing section of the draft tube at the position is H-1/5R; the relation between the linear distance h from the central point of the upper end surface of the vortex suppression fin boss to the joint of the draft tube diffusion section and the runner chamber and the length L of the draft tube diffusion section is h-1/3L.
The external surface of the hub body is smooth, the cross section is circular, the blades of each rotating wheel enclose an annular rotator, and the annular rotator is nested on the hub body with the smooth external surface.
The rear guide vane is a straight guide vane profile, the axial distance between the water inlet edge of the rear guide vane and the rotating center of the rotating wheel is D under the positive working condition, the relation between the water inlet edge of the rear guide vane and the diameter D of the rotating wheel is that D is 1/3D, and the number of the rear guide vane is 6.
The beneficial effects of the utility model are that, through setting up the rearmounted stator of a certain amount, the degree of prewhirl of runner import rivers when increasing reverse operating mode reduces rivers striking loss to unit efficiency when increasing reverse electricity generation. Through set up at the draft tube diffuser section and press down the whirlpool device, under the low discharge operating mode, because the flow reduces, when the action force relative increase of runner to rivers makes the interior rivers flow state of draft tube disorderly form the swirl, rivers can produce the hindrance effect to the vortex when pressing down the whirlpool device (spiral protrusion and fin boss), make draft tube vortex core orbit to keeping away from one side removal of pressing down the whirlpool device, the diameter of vortex core orbit also reduces to some extent, press down the whirlpool device and can reduce vortex orbit diameter, and then the effect of performance suppression pressure pulsation. The arrangement of the drainage runner can also break up the cavity vortex strip in the extension section of the draft tube, thereby ensuring that the unit is not influenced by low-frequency pulsation.
Drawings
FIG. 1 is a schematic structural view of a through-flow turbine for improving draft tube pressure pulsation according to the present invention;
FIG. 2 is a front view of a rear guide vane of a tubular turbine for improving draft tube pressure pulsation according to the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a schematic view of the top view of the vortex suppression fin boss of the tubular turbine for improving the pressure pulsation of the draft tube of the present invention;
fig. 5 is a partial enlarged schematic view of the vortex suppression fin boss of the tubular turbine for improving the pressure pulsation of the draft tube of the present invention.
In the figure, 1, a water inlet flow passage, 2, buttresses, 3, guide vanes, 4, a rotating wheel, 5, rear guide vanes, 6, a tail water pipe diffusion section, 7, a tail water pipe extension section, 8, a vortex suppression spiral bulge, 9, a vortex suppression fish fin boss and 10, a hub body.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a tubular turbine for improving draft tube pressure pulsation, as shown in figure 1, which comprises a water inlet flow channel 1, wherein one end close to the water inlet flow channel 1 is sequentially communicated with a guide vane 3, a runner chamber 5, a draft tube diffusion section 6 and a draft tube extension section 7; a hub body 10 is also distributed along the central shaft direction of the water inlet flow passage 1, and a hub body 9 extends to the tail water pipe diffusion section 6; the hub body 10 is fixed in the water inlet flow passage 1 through the buttress 2, the guide vane 3 is fixed on the outer surface of the hub body 10, a circle of runner blades are arranged along the circumferential direction of the hub body 10 in a rotating way, and the rear guide vane 5 is arranged on the hub body 10 closely adjacent to the runner blades; be provided with in the draft tube and press down the whirlpool device, press down the whirlpool device including pressing down whirlpool spiral arch 8 and pressing down whirlpool fin boss 9, press down whirlpool fin boss 9 and fix on 6 inner walls of draft tube diffuser section along the center pin direction, press down whirlpool spiral arch 8 and be the semi-cylindrical protruding structure that distributes at whole draft tube inner wall along the center pin direction.
The hub body 10 has a smooth outer surface and a circular cross section, the blades of each runner 4 enclose an annular rotator which is nested on the hub body 10 with a smooth outer surface, and when water flow impacts, the blades of the runners 4 start to rotate to apply work.
As shown in fig. 1 and 2, the rear guide vane 5 is a straight guide vane blade type, the axial distance between the water inlet edge of the rear guide vane and the rotation center of the runner is D under the forward working condition, the relation between the D and the diameter D of the runner 4 is 1/3D, and the number of the rear guide vane blades is 6.
The vortex suppression device comprises a vortex suppression spiral bulge 8 and a vortex suppression fin boss 9.
The vortex suppressing spiral protrusion 8 is arranged on the whole inner wall of the tail water pipe as shown in fig. 1, the protrusion is in a semi-cylindrical shape with the radius r, and the relation between the r and the height H of the vortex suppressing fin boss 9 is 1/2H. The relationship between the spiral pitch S and the convex radius r is S-2 r. The helix angle α is 5 °.
The number of the vortex suppression fin bosses 9 is 4, and the vortex suppression fin bosses are uniformly distributed on the inner wall of the tail water pipe.
As shown in fig. 3 and 4, each of the vortex suppressing fin bosses 9 has a sheet structure composed of an upper end surface and a lower end surface, both of which are elliptical, and the area of the upper end surface is smaller than that of the lower end surface. The lower end face of the vortex suppression fin boss 9 is tightly attached to the inner wall of the draft tube diffusion section, and the long half shaft of the upper end face is arranged in parallel with the central axis of the water turbine.
The relation between the length a of the elliptic major semi-axis of the upper end face of the vortex suppression fin boss 9 and the length L of the draft tube diffusion section 6 is 1/6L, the relation between the length B of the minor semi-axis and the length L of the draft tube diffusion section 6 is 1/12L, and the elliptic major semi-axis A and the elliptic minor semi-axis B of the lower end face are respectively 2 times of the length of the major semi-axis of the upper end face and the minor semi-axis B of the upper end face. The axial distance between the center of the upper end face and the center of the lower end face is a.
As shown in fig. 5, the relation between the distance H from the upper end surface of the vortex suppression fin boss 9 to the central axis of the turbine and the radius R of the cross section of the draft tube divergent section 6 is H-1/5R. The relation between the linear distance h from the central point of the upper end surface of the vortex suppression fin boss 9 to the joint of the draft tube diffusion section and the runner chamber and the length L of the draft tube diffusion section is h-1/3L.
And one end of the vortex suppression fin boss 9 is fixed on the inner wall of the draft tube diffusion section, and the other end of the vortex suppression fin boss is not fixed and is in contact with water flow.
The draft tube diffusion section 6 is of a horn shape with a large caliber at one end and a small caliber at the other end, wherein the end with the large caliber is connected with the draft tube extension section 7, and the end with the small caliber is connected with the rear guide vane 5 of the draft tube.
The utility model discloses an improve draft tube pressure pulsation's through-flow turbine's working process as follows:
when the through-flow turbine works under the working condition of small flow, water flow enters through the water inlet flow channel 1 and flows through the buttresses 2 and the guide vanes 3, the rotating water flow pushes the blades of the rotating wheel 4 to do work, the water flow flows into the rear guide vanes 5 after having a certain circulation amount, and a large number of periodic vortexes can be formed at the moment. The periodic vortex not only affects the flow state in the tail water pipe, but also induces pressure pulsation in the tail water pipe. After entering the draft tube diffuser 6, when the vortex flows through the vortex suppression device, the vortex suppression spiral protrusion 8 and the vortex suppression fin boss 9 can extrude and block the vortex, so that the vortex center track in the draft tube moves to one side far away from the vortex suppression device, the diameter of the vortex center track is reduced, the bad flow state in the draft tube is improved, and the pressure pulsation amplitude is reduced. When the reverse working condition generates electricity, the water flow passes through a poor flow state generated by the vortex suppression device and passes through the rear guide vane 5, so that the incoming flow prerotation degree is increased, the water flow impact loss is reduced, the pressure pulsation is reduced, and the unit efficiency of the reverse electricity generation is increased.
Claims (7)
1. A through-flow turbine for improving draft tube pressure pulsation is characterized by comprising a water inlet flow channel (1), wherein one end close to the water inlet flow channel (1) is sequentially communicated with a guide vane (3), a rear guide vane (5), a draft tube diffusion section (6) and a draft tube extension section (7); a hub body (10) is also distributed along the central shaft direction of the water inlet flow channel (1), and the hub body (10) extends to the tail water pipe diffusion section (6); the hub body (10) is fixed in the water inlet flow channel (1) through the buttress (2), the guide vane (3) is fixed on the outer surface of the hub body (10), a circle of runner blades are arranged along the circumferential direction of the hub body (10) in a rotating mode, and the rear guide vane (5) is arranged on the hub body (10) next to the runner blades; the vortex suppression device is arranged in the draft tube and comprises vortex suppression spiral protrusions (8) and vortex suppression fin bosses (9), the vortex suppression fin bosses (9) are fixed on the inner wall of the draft tube diffusion section (6) along the direction of a central shaft, and the vortex suppression spiral protrusions (8) are semi-cylindrical protrusion structures distributed in the whole draft tube along the direction of the central shaft.
2. The cross flow turbine for improving draft tube pressure pulsation according to claim 1, wherein said protrusion is closely attached to the entire draft tube inner wall, and has a semi-cylindrical shape with a radius r, and the relation between r and the height H of the vortex suppressing fin boss (9) is 1/2H; the relationship between the helical pitch S and the radius r of the projection is S2 r and the helix angle α is 5 °.
3. The cross-flow turbine for improving draft tube pressure pulsation according to claim 1, wherein each of the vortex suppressing fin bosses (9) has a sheet structure consisting of an upper end surface and a lower end surface, both end surfaces are elliptical, the area of the upper end surface is smaller than that of the lower end surface, the lower end surface of each of the vortex suppressing fin bosses (9) is closely attached to the inner wall of the draft tube diffusing section, and the major axis of the upper end surface is arranged in parallel with the central axis of the turbine.
4. A flow turbine according to claim 3, wherein the relationship between the length a of the oval major axis of the upper end surface of the vortex suppressing fin boss (9) and the length L of the draft tube divergent section (6) is 1/6L, the relationship between the length B of the minor axis and the length L of the draft tube divergent section (6) is 1/12L, the length a of the oval major axis a and the length B of the minor axis of the lower end surface are respectively 2 times the length of the major axis and the minor axis of the upper end surface, and the axial distance between the center of the upper end surface and the center of the lower end surface is a.
5. A flow turbine for improving draft tube pressure pulsation according to claim 4, wherein the distance H from the upper end surface of said vortex suppressing fin boss (9) to the center axis of the turbine is 1/5R; the relation between the linear distance h from the central point of the upper end surface of the vortex suppression fin boss (9) to the joint of the draft tube diffusion section (6) and the runner chamber and the length L of the draft tube diffusion section is 1/3L.
6. A flow turbine of improved draft tube pressure pulsation according to claim 1 wherein said hub body (10) is smooth on the outside surface and circular in cross section, and the blades of each runner (4) enclose an annular body of revolution nested within the smooth outside hub body (10).
7. A flow turbine according to claim 1, wherein the rear guide vane (5) is a straight guide vane blade type, the axial distance between the water inlet edge of the rear guide vane and the rotation center of the runner is D under the forward working condition, the relation between the water inlet edge of the rear guide vane and the diameter D of the runner (4) is 1/3D, and the number of the rear guide vane blades is 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022798980.8U CN213981024U (en) | 2020-11-27 | 2020-11-27 | Tubular turbine for improving draft tube pressure pulsation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022798980.8U CN213981024U (en) | 2020-11-27 | 2020-11-27 | Tubular turbine for improving draft tube pressure pulsation |
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| Publication Number | Publication Date |
|---|---|
| CN213981024U true CN213981024U (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022798980.8U Expired - Fee Related CN213981024U (en) | 2020-11-27 | 2020-11-27 | Tubular turbine for improving draft tube pressure pulsation |
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| Country | Link |
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| CN (1) | CN213981024U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114198236A (en) * | 2021-12-08 | 2022-03-18 | 福建华电电力工程有限公司 | Variable angle umbrella type flow guiding device for bulb tubular turbine water outlet pipe |
| CN114526392A (en) * | 2022-02-10 | 2022-05-24 | 国网福建省电力有限公司电力科学研究院 | Vortex band device is eliminated in mixing of draft tube |
-
2020
- 2020-11-27 CN CN202022798980.8U patent/CN213981024U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114198236A (en) * | 2021-12-08 | 2022-03-18 | 福建华电电力工程有限公司 | Variable angle umbrella type flow guiding device for bulb tubular turbine water outlet pipe |
| CN114526392A (en) * | 2022-02-10 | 2022-05-24 | 国网福建省电力有限公司电力科学研究院 | Vortex band device is eliminated in mixing of draft tube |
| CN114526392B (en) * | 2022-02-10 | 2023-09-22 | 国网福建省电力有限公司电力科学研究院 | Vortex band eliminating device for mixing of draft tube |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210817 |