CN212563513U - A diagonal flow turbine draft tube - Google Patents
A diagonal flow turbine draft tube Download PDFInfo
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- CN212563513U CN212563513U CN202021012744.2U CN202021012744U CN212563513U CN 212563513 U CN212563513 U CN 212563513U CN 202021012744 U CN202021012744 U CN 202021012744U CN 212563513 U CN212563513 U CN 212563513U
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- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000010349 pulsation Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 238000009792 diffusion process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003245 working effect 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
一种斜流式的水轮机尾水管，包括设置在水轮机转轮出口处的弯肘段单元、与弯肘段单元后端相连的扩散段单元，还包括设置在水轮机转轮出口处的连接水轮机转轮出口和弯肘段单元前端的斜锥段单元，所述斜锥段单元的进出口中心连线向下游侧倾斜与竖直垂线成一个角度α；所述斜锥段单元的水平截面均为圆形，半径由上到下逐渐增大；所述斜锥段单元的横截面为椭圆形，且短轴方向向下游侧。本实用新型可有效消除涡带产生，减轻压力脉动。
An oblique flow turbine draft tube, comprising an elbow section unit arranged at the outlet of the turbine runner, a diffuser section unit connected to the rear end of the elbow section unit, and a connecting hydraulic turbine rotor arranged at the outlet of the turbine runner. The wheel outlet and the inclined cone section unit at the front end of the elbow section unit, the center line connecting the inlet and outlet of the inclined cone section unit is inclined to the downstream side and forms an angle α with the vertical vertical line; the horizontal section of the inclined cone section unit is It is circular, and the radius gradually increases from top to bottom; the cross section of the oblique cone segment unit is elliptical, and the short axis direction is to the downstream side. The utility model can effectively eliminate the generation of vortex belts and reduce pressure pulsation.
Description
Technical Field
The patent of the utility model belongs to hydraulic and hydroelectric engineering field especially relates to a hydraulic turbine draft tube of diagonal flow formula.
Background
In recent years, a large number of large and medium-sized hydropower stations are built at home and abroad, and water turbines in the hydropower stations are key components for converting water energy into mechanical energy. The turbine is often accompanied with violent flow instability in the operation process (especially under the off-design condition), and vortex strips are generated, so that large pressure pulsation, vibration of a hydropower station building and noise are generated.
Although many projects adopt measures such as aeration and water spraying to deal with the flow instability of the water turbine, the necessary knowledge for the vortex strip generation of the water turbine is still lacked at home and abroad, and the instability problem of the water turbine under the non-design working condition is still severe.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the current hydraulic turbine that will solve produces the problem of vortex area, provides a hydraulic turbine draft tube of diagonal flow formula.
In order to achieve the above purpose, the utility model adopts the following specific technical scheme:
a diagonal flow type draft tube of a water turbine comprises an elbow section unit arranged at an outlet of a runner of the water turbine, a diffuser section unit connected with the rear end of the elbow section unit and a diagonal cone section unit arranged at the outlet of the runner of the water turbine and connected with the outlet of the runner of the water turbine and the front end of the elbow section unit, wherein an inlet-outlet central connecting line of the diagonal cone section unit inclines towards a downstream side and forms an angle alpha with a vertical line; the horizontal sections of the oblique cone section units are all circular, and the radius of the oblique cone section units is gradually increased from top to bottom; the cross section of the oblique cone section unit is elliptical, and the minor axis direction of the oblique cone section unit faces to the downstream side.
Furthermore, the angle formed by the central connecting line of the inlet and the outlet of the oblique cone section unit and the vertical line is
The angle between the upstream side wall tangent plane of the oblique cone section unit and the vertical line is
The downstream side wall tangent plane of the oblique cone section unit forms an angle with the vertical line
Wherein l is the horizontal offset distance of the outlet center of the oblique cone section unit relative to the inlet center, and h is the vertical height of the oblique cone section unit; r is the outlet radius of the oblique cone section unit, and R is the inlet radius of the oblique cone section unit.
The utility model discloses following beneficial effect has:
1. the utility model has the advantages that the oblique cone section unit is arranged to lead the water flow to the downstream side in an oblique way, and the asymmetric arrangement in the vertical direction can destroy the structure of the vortex band, thereby eliminating the vortex band;
2. the cross section of the oblique cone section unit of the utility model is oval, which can effectively increase the resistance of the circumferential flow of water flow, thereby achieving the function of eliminating the vortex band;
3. the inclined water turbine draft tube of the utility model has good effect of reducing pressure pulsation, almost has no influence on the efficiency of the water turbine, and can be used under the design working condition;
drawings
FIG. 1 is an overall layout of a diagonal draft tube of the present invention;
FIG. 2 is a front view of the oblique conic section unit of the present invention;
FIG. 3 is a vertical cross section c of the oblique conic section unit of FIG. 1;
in the figure: the device comprises 1 oblique cone section unit, 2 elbow section unit, 3 diffusion section unit, 4 water turbine, 5 upstream side wall section, 6 downstream side wall section and 7 vertical line.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3 in combination, as shown in the figures, a diagonal flow turbine draft tube comprises a diagonal cone unit 1 arranged at an outlet of a turbine runner, wherein the diagonal cone unit 1 is connected with an elbow unit 2, and the elbow unit 2 is connected with a diffuser unit 3. As shown in the attached figure 1, water flows in from a water turbine 4, flows out through an oblique cone section unit 1, an elbow section unit 2 and a diffusion section unit 3, divides the upper side and the lower side according to the water flow direction, and the whole device is vertically placed, wherein a is that the horizontal section of an inlet of the oblique cone section unit is parallel to the horizontal plane, b is that the horizontal section of an outlet of the oblique cone section unit is parallel to the horizontal plane, c is that the vertical cross section of the oblique cone section unit forms a certain included angle with the horizontal plane, and a vertical line 7 is a line which is vertical to the horizontal plane. The central connecting lines of the inlet and the outlet of the oblique cone section unit incline towards the downstream side and form an angle alpha with a vertical perpendicular line 7, the horizontal sections of the oblique cone section unit are all circular, namely the sections a and b in the figure 1 are circular, the radius is gradually increased from top to bottom, namely the diameter of the section b is larger than that of the section a, the cross section of the oblique cone section unit is elliptical, namely the section c is elliptical, and the minor axis direction is towards the downstream side as shown in figure 3.
As shown in fig. 2, the inlet radius of the oblique cone section unit 1 is R, and the outlet radius is R, which is determined by design according to the type of the water turbine. The horizontal offset distance of the outlet center of the inclined cone section unit 1 relative to the inlet center is l, and the inclined cone section unit is designed and determined according to the specific operation condition of the water turbine. Wherein the angle formed by the central connecting line of the inlet and the outlet of the oblique cone section unit 1 and the vertical line is
The angle between the upstream side wall tangent plane of the oblique cone section unit and the vertical line is
The downstream side wall tangent plane of the oblique cone section unit 1 forms an angle with the vertical line
The horizontal sections of the oblique cone section units 1 are all circular, and the radius of the oblique cone section units is gradually increased from R to R.
Elbow section unit 2 and diffuser section unit 3 all design according to prior art, and elbow section unit 2's import is connected with the export of oblique cone section unit 1, and diffuser section unit 3's import is connected with elbow section unit 2's export.
The utility model discloses can promote the water and electricity energy further development and utilize, be favorable to improving the working property of the hydraulic turbine.
It should be understood that parts of the specification not set forth in detail are well within the prior art.
It should be understood that the above description of the preferred embodiments is given in some detail, and not as a limitation to the scope of the invention, and that various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention as defined by the appended claims.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021012744.2U CN212563513U (en) | 2020-06-05 | 2020-06-05 | A diagonal flow turbine draft tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021012744.2U CN212563513U (en) | 2020-06-05 | 2020-06-05 | A diagonal flow turbine draft tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212563513U true CN212563513U (en) | 2021-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021012744.2U Expired - Fee Related CN212563513U (en) | 2020-06-05 | 2020-06-05 | A diagonal flow turbine draft tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212563513U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915045A (en) * | 2021-10-18 | 2022-01-11 | 扬州大学 | Mixed-flow water turbine draft tube with inclined curved cone |
| CN114109696A (en) * | 2021-11-05 | 2022-03-01 | 西华大学 | A method for improving pressure pulsation in the draft tube of a Francis pump turbine |
-
2020
- 2020-06-05 CN CN202021012744.2U patent/CN212563513U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113915045A (en) * | 2021-10-18 | 2022-01-11 | 扬州大学 | Mixed-flow water turbine draft tube with inclined curved cone |
| CN114109696A (en) * | 2021-11-05 | 2022-03-01 | 西华大学 | A method for improving pressure pulsation in the draft tube of a Francis pump turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210219 |