CN109441691A - A kind of draft tube band cowling panel Francis turbine - Google Patents
A kind of draft tube band cowling panel Francis turbine Download PDFInfo
- Publication number
- CN109441691A CN109441691A CN201811190235.6A CN201811190235A CN109441691A CN 109441691 A CN109441691 A CN 109441691A CN 201811190235 A CN201811190235 A CN 201811190235A CN 109441691 A CN109441691 A CN 109441691A
- Authority
- CN
- China
- Prior art keywords
- draft tube
- cowling panel
- runner
- guide vane
- hydraulic turbine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/02—Machines or engines of reaction type; Parts or details peculiar thereto with radial flow at high-pressure side and axial flow at low-pressure side of rotors, e.g. Francis turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/121—Blades, their form or construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/12—Blades; Blade-carrying rotors
- F03B3/125—Rotors for radial flow at high-pressure side and axial flow at low-pressure side, e.g. for Francis-type turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
- F03B3/16—Stators
- F03B3/18—Stator blades; Guide conduits or vanes, e.g. adjustable
- F03B3/186—Spiral or volute casings
-
- 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
Abstract
The invention discloses a kind of draft tube band cowling panel Francis turbine, the basin of crossing of the hydraulic turbine includes sequentially connected spiral case (1), guide vane domain (2), runner (4) and the draft tube (7) with cowling panel (8)；Wherein, draft tube (7) right cone section angle of flare is β1=6 °, draft tube is interior to be equipped with the trapezoid cross section cowling panel (8) with circular arc side, and circumferentially, cowling panel (8) is by proximal ends cone angle beta for patch draft tube (7) inner wall in hydraulic turbine axis for each cowling panel (8)2=9 °, cowling panel (8) thickness control direction is β3=10 °, and cowling panel (8) number is 4~6.The present invention is while improving runner non-stable diffusion to improve hydraulic turbine operation performance, it is intended to improve under draft tube energetic coefficient of restitution and improvement or elimination off-design behaviour vortex phenomenon in draft tube, the thought has universality, especially for each form water pump, the hydraulic turbine and the Reversible Pump-Turbine unit such as with draft tube.
Description
Technical field
The invention belongs to field of hydraulic machinery technology, more particularly to a kind of draft tube band cowling panel Francis turbine.
Background technique
Hydroelectric generation is smaller to environmental impact as renewable energy.In addition to it can provide cheap electric power, also having be can control
Flooding of rivers provides irrigation water, improves the advantages that river shipping.Francis turbine is the hydroelectric power system hydraulic turbine instantly
Research, design, manufacture level standard and represent type, to high efficiency, large capacity target develop while, it is also whole to its
More stringent requirements are proposed for reliability, stability, safety of machine etc..
Chinese patent application 201210209725.2 discloses a kind of vortex generator for turbine draft tube, for generating one
The small whirlpool of series, to neutralize the whirlpool of turbine draft tube itself, the structure is simple and flexible for installation, but the device need water flow around
Stream can just generate vortex, and it is an extremely complex process that new whirlpool and draft tube itself whirlpool, which neutralize, it will generate quadratic effect
Loss.Chinese patent application 201410243350.0 discloses a kind of draft tube for the hydraulic turbine, in the channel of draft tube
Flow regulating barrels equipped with rear and front end opening, to inhibit the generation and influence of eccentric vortex band, however most of research achievement shows tail
Water pipe vortex rope appearance position first can only have an impact vortex rope trailing vortices stream close to outlet of rotary wheel, the device present position, and
The device needs fixed link to connect with draft tube wall surface, and on the one hand the complexity for increasing structure, another party is added in additional component
Face, which is located at the connecting rod in flow field, can also have an impact stream in draft tube, and second of connection type is fixed on for connecting rod
Ground increases interior stream and extraneous seal operation.Chinese patent application 201611243124.8 discloses a kind of band spherical surface spiral shell
Helical blade is arranged as runner is revolved with identical speed in the double-rotary-wheel water turbine used for cooling tower for revolving shape blade in draft tube
Turn to increase power output, but its structure is complex, and processing difficulties cost is high, and additional runner requires to mention to the external structures component capabilities such as axis
Height, the additional outlet pipe that increases increases space needed for unit, and runner bucket discharge velocity direction hits helical blade and causes this
Flow passing section loss increases, entire flow field unstability enhancing etc..
In conclusion needing to be directed on the basis of flow characteristic is in the improvement hydraulic turbine to improve hydraulic turbine operation performance
The deficiencies in the prior art propose that one kind can be improved turbine draft tube energetic coefficient of restitution and improve its interior flow field stability
Effective, simply and easy treat countermeasure.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, a kind of draft tube band cowling panel mixed flow is provided
The formula hydraulic turbine can solve turbine draft tube flow field eddy current problem on the basis of realizing that water flow can be converted efficiently, from
And improve the operation stability of unit.
The present invention adopts the following technical scheme that realize:
The basin of crossing of a kind of draft tube band cowling panel Francis turbine, the hydraulic turbine includes sequentially connected spiral case, leads
Leaf domain, runner and the draft tube with cowling panel；Wherein,
Draft tube right cone section angle of flare is β1=6 °, draft tube is interior equipped with the trapezoid cross section cowling panel with circular arc side, each whole
Circumferentially, cowling panel leans on proximal ends cone angle beta to patch tail water inside pipe wall to flowing plate in hydraulic turbine axis2=9 °, rectify plate thickness
Control direction is β3=10 °, and cowling panel number is 4~6.
A further improvement of the present invention lies in that the section of cowling panel is trapezoidal, it is bus around the rotation of hydraulic turbine axis using L1
Turn β3The side L2 is obtained, scanned range is to rectify plate thickness；The side cowling panel L3 is bonded with draft tube, close to turbine shaft line side
Trapezoidal side L4 molded line is y=3.335x+31.72, and the side L5 is concordant with draft tube outlet.
A further improvement of the present invention lies in that spiral case is cornerite formula spiral case, section is ellipse, and each oval length ratio
Equal to 1.618, spiral case elliptical cross section area circumferentially direction change tendency equation are as follows: y=-0.041x+0.239, the cornerite of spiral case
It is 315 °~335 °.
A further improvement of the present invention lies in that if guide vane domain inner circumferential is evenly equipped with dry buckling blade profile guide vane, single-row guide vane
Number is 16, guide vane pitch circle diameter DVWith runner inlet diameter DIRatio is 2.1916, guide vane throat diameter DTWith runner import
Diameter DIRatio is 0.0825.
A further improvement of the present invention lies in that runner inlet height B3 and runner inlet diameter DIRatio is 0.096, runner
Outlet diameter DPWith runner inlet diameter DIRatio is 0.513.
A further improvement of the present invention lies in that runner bucket is made of several linear leafs and short blade interval, and runner
Linear leaf and short blade press 1:1 arranged for interval, and it is 0.336 that linear leaf and short blade, which go out flow diameter ratio, linear leaf wrap angle sigma=65 °
~85 °.
Compared with prior art, the present invention has following beneficial technical effect:
First, a kind of draft tube band cowling panel Francis turbine proposed by the present invention is stable, turns to water flow energy
Rate height is changed, deviated splitter vane setting can be such that the design size of runner reduces, to reduce hydraulic turbine overall dimensions, reduce cost.
Second, the included trapezoidal cowling panel structure of draft tube proposed by the present invention improves draft tube energetic coefficient of restitution, changes
It is kind even to be eliminated under off-design behaviour vortex phenomenon in draft tube, to reduce Internal flow loss, on the one hand improve the hydraulic turbine
On the other hand operational efficiency improves entire hydro-generating Unit operation stability, extends unit durability.
Third, the included trapezoidal cowling panel structure of draft tube proposed by the present invention has universality, especially for such as magnetic tape trailer
Each form water pump, the hydraulic turbine and the Reversible Pump-Turbine unit of water pipe, are separated vortex structure simultaneously in outlet of rotary wheel
The mode of rectification has certain reference value to the stability study of each hydraulic.
Detailed description of the invention
Fig. 1 is a kind of draft tube band cowling panel Francis turbine structural schematic diagram proposed by the present invention.
Fig. 2 is runner linear leaf sectional view.
Fig. 3 is the long and short blade front view of runner.
Fig. 4 is negative cruvature blade profile Guide vane profile schematic diagram.
Fig. 5 is draft tube top view.
Fig. 6 is draft tube front view.
Description of symbols: 1- spiral case, 2- guide vane domain, 3- guide vane, 4- runner, 5- short blade, 6- linear leaf, 7- tail water
Pipe, 8- cowling panel.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of draft tube band cowling panel Francis turbine provided by the invention, including sequentially connected snail
Shell 1, guide vane domain 2, runner 4 and draft tube 7,1 section of spiral case are ellipse, outlet anchor ring and 2 import anchor ring of guide vane domain
Connection；The guide vane domain 2 includes 16 circumferentially uniformly distributed negative cruvature blade profile guide vanes 3, and water flow enters runner 4 by 3 throat of guide vane,
Runner 4 is made of 9 intervals of short blade 5 and 9 linear leaf 6, and water flow is to 4 work done of runner, so that driven by rotating wheel and motor phase
The axis of connection rotates, and realizes that water flow can arrive the conversion of mechanical energy；Runner 4 goes out to flow through to be flowed out by draft tube 7, in the draft tube 7
Wall has cowling panel 8, and the formation for preventing outlet of rotary wheel vortex rope is arranged in trapezoidal cowling panel 8, so as to improve fluidised form in draft tube,
While to improve draft tube energetic coefficient of restitution, it is beneficial to improve hydraulic turbine overall operation stability.
Realization principle of the invention is:
A kind of draft tube band cowling panel Francis turbine proposed by the present invention, in the base for improving hydraulic turbine operation efficiency
Operation stability is promoted on plinth, the spaced apart linear leaf 6 of setting, short blade 5 are in runner 4 to improve runner flow field；It is ingenious
Ground is uniformly set in 7 inner circumferential wall of draft tube with taper blade, is gone out to flow circumferential speed to separate runner, is organized whirlpool
The formation of stream, and the taper blade plays the role of water conservancy diversion and rectification, so that very good solution is due to improving runner flow field characteristic
Quadratic effect is flowed in caused draft tube, greatly enhances turbine characteristics.
Embodiment
The present invention provides a kind of further preferred scheme of the draft tube with cowling panel Francis turbine: draft tube right cone
Section angle of flare is β1=6 °, draft tube is interior to be equipped with the trapezoid cross section cowling panel with circular arc side, and each cowling panel surrounds hydraulic turbine axis
Circumferentially, cowling panel leans on proximal ends cone angle beta to interior patch tail water inside pipe wall2=9 °, cowling panel thickness control direction is β3It is=10 °, whole
Flowing plate number is 4.
Cowling panel section is trapezoidal, is bus around axis rotation β using L13The side L2 is obtained, scanned range is to rectify
Plate thickness；The side cowling panel L3 is bonded with draft tube, is y=3.335x+ close to turbine shaft line side trapezoidal side L4 curved dies
31.72, L5 sides are concordant with draft tube outlet.
Cornerite formula spiral case section is ellipse, and each oval length ratio is equal to 1.618, and spiral case elliptical cross section area is circumferentially square
To variation tendency equation are as follows: y=-0.041x+0.239, cornerite are 318 °.
Runner linear leaf 6 is three-dimensional twisted curved surface, divides equally four sections according to bone line with blade height direction, shown in dotted line
For molded line where each section blades.
Short blade 5 is consistent with 6 blade profile of linear leaf, and runner deviated splitter vane presses 1:1 arranged for interval, and deviated splitter vane goes out flow diameter
Than being 0.336, linear leaf wrap angle sigma=70 °.
Single-row negative cruvature blade profile guide vane is 16 uniformly distributed by circumferencial direction, 3 pitch circle diameter D of guide vaneVWith runner inlet diameter DI
Ratio is 2.1916,3 throat diameter D of guide vaneTWith runner inlet diameter DIRatio is 0.0825.
The explanation being not directed in specific implementation of the invention belongs to techniques known, can refer to well-known technique and is subject to
Implement.The present invention achieves satisfied application effect, a kind of draft tube band cowling panel described in embodiment through validation trial
It is mechanical that the thought of structure is suitable for each magnetic tape trailer hydraulic plumbing.
The above specific embodiment and embodiment are to a kind of draft tube band cowling panel mixed-flow wheel proposed by the present invention
The specific support of the technical idea of machine cannot be limited the scope of protection of the present invention with this, all according to skill proposed by the present invention
Art thought, any equivalent variations or equivalent change done on the basis of the technical program, belongs to technical solution of the present invention
The range of protection.
Claims (6)
1. a kind of draft tube band cowling panel Francis turbine, which is characterized in that the basin of crossing of the hydraulic turbine includes being sequentially connected
Spiral case (1), guide vane domain (2), runner (4) and the draft tube (7) with cowling panel (8)；Wherein,
Draft tube (7) right cone section angle of flare is β1=6 °, draft tube is interior equipped with the trapezoid cross section cowling panel (8) with circular arc side, each whole
Circumferentially, cowling panel (8) leans on proximal ends cone angle beta to patch draft tube (7) inner wall to flowing plate (8) in hydraulic turbine axis2It is=9 °, whole
Flowing plate (8) thickness control direction is β3=10 °, and cowling panel (8) number is 4~6.
2. a kind of draft tube band cowling panel Francis turbine according to claim 1, which is characterized in that cowling panel (8)
Section be trapezoidal, be bus around hydraulic turbine axis rotation β using L13The side L2 is obtained, scanned range is cowling panel (8) thickness
Degree；Cowling panel (8) side L3 is bonded with draft tube (7), is y=3.335x+ close to turbine shaft line side trapezoidal side L4 curved dies
31.72, L5 sides are concordant with draft tube outlet.
3. a kind of draft tube band cowling panel Francis turbine according to claim 1, which is characterized in that spiral case (1) is
Cornerite formula spiral case, section is ellipse, and each oval length ratio is equal to 1.618, and circumferentially direction becomes spiral case elliptical cross section area
Change tendency equation are as follows: y=-0.041x+0.239, the cornerite of spiral case (1) are 315 °~335 °.
4. a kind of draft tube band cowling panel Francis turbine according to claim 1, which is characterized in that guide vane domain (2)
Inner circumferential is evenly equipped with several negative cruvature blade profile guide vanes (3), and the number of single-row guide vane (3) is 16, guide vane (3) pitch circle diameter DVWith
Runner inlet diameter DIRatio is 2.1916, guide vane (3) throat diameter DTWith runner inlet diameter DIRatio is 0.0825.
5. a kind of draft tube band cowling panel Francis turbine according to claim 1, which is characterized in that runner (4) into
Open height B3 and runner inlet diameter DIRatio is 0.096, discharge diameter of runner DPWith runner inlet diameter DIRatio is 0.513.
6. a kind of draft tube band cowling panel Francis turbine according to claim 1, which is characterized in that runner bucket by
Several linear leafs (6) and short blade (5) interval composition, and the linear leaf (6) of runner (4) and short blade (5) press the interval 1:1 cloth
It sets, it is 0.336 that linear leaf (6) and short blade (5), which go out flow diameter ratio, linear leaf (6) wrap angle sigma=65 °~85 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811190235.6A CN109441691B (en) | 2018-10-12 | 2018-10-12 | Mixed-flow water turbine with tail water pipe and rectifying plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811190235.6A CN109441691B (en) | 2018-10-12 | 2018-10-12 | Mixed-flow water turbine with tail water pipe and rectifying plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109441691A true CN109441691A (en) | 2019-03-08 |
| CN109441691B CN109441691B (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811190235.6A Active CN109441691B (en) | 2018-10-12 | 2018-10-12 | Mixed-flow water turbine with tail water pipe and rectifying plate |
Country Status (1)
| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360660A (en) * | 2020-11-06 | 2021-02-12 | 陕西省引汉济渭工程建设有限公司 | Long and short blade type reversible pump turbine |
| CN115405454A (en) * | 2022-08-31 | 2022-11-29 | 扬州大学 | Multifunctional mixed-flow water turbine and automatic adjusting system |
| CN115822839A (en) * | 2022-11-19 | 2023-03-21 | 江苏大学流体机械温岭研究院 | Energy recovery turbine draft tube with guide vanes |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5266128A (en) * | 1975-11-27 | 1977-06-01 | Toshiba Corp | Draft tube |
| CN101158328A (en) * | 2007-10-12 | 2008-04-09 | 杭州电子科技大学 | Novel draft-tube and preparation method thereof |
| CN201083177Y (en) * | 2007-10-12 | 2008-07-09 | 杭州电子科技大学 | Draft tube |
| CN102720622A (en) * | 2012-06-21 | 2012-10-10 | 河海大学 | Vortex generator for turbine draft tube |
| CN203214227U (en) * | 2013-04-02 | 2013-09-25 | 河海大学 | Small mixed-flow water turbine for water-cooling tower system |
| CN103498749A (en) * | 2013-09-27 | 2014-01-08 | 河海大学 | Small-sized mixed-flow pump turbine for low water head pumped storage power station |
| CN103696895A (en) * | 2013-12-19 | 2014-04-02 | 广东电网公司电力科学研究院 | Mixed-flow type water pump turbine |
| CN104121138A (en) * | 2014-07-28 | 2014-10-29 | 清华大学 | Water turbine draft tube with vortex restraining function |
| CN204591564U (en) * | 2015-03-06 | 2015-08-26 | 西安理工大学 | A kind of Francis turbine with exit guide vane |
-
2018
- 2018-10-12 CN CN201811190235.6A patent/CN109441691B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5266128A (en) * | 1975-11-27 | 1977-06-01 | Toshiba Corp | Draft tube |
| CN101158328A (en) * | 2007-10-12 | 2008-04-09 | 杭州电子科技大学 | Novel draft-tube and preparation method thereof |
| CN201083177Y (en) * | 2007-10-12 | 2008-07-09 | 杭州电子科技大学 | Draft tube |
| CN102720622A (en) * | 2012-06-21 | 2012-10-10 | 河海大学 | Vortex generator for turbine draft tube |
| CN203214227U (en) * | 2013-04-02 | 2013-09-25 | 河海大学 | Small mixed-flow water turbine for water-cooling tower system |
| CN103498749A (en) * | 2013-09-27 | 2014-01-08 | 河海大学 | Small-sized mixed-flow pump turbine for low water head pumped storage power station |
| CN103696895A (en) * | 2013-12-19 | 2014-04-02 | 广东电网公司电力科学研究院 | Mixed-flow type water pump turbine |
| CN104121138A (en) * | 2014-07-28 | 2014-10-29 | 清华大学 | Water turbine draft tube with vortex restraining function |
| CN204591564U (en) * | 2015-03-06 | 2015-08-26 | 西安理工大学 | A kind of Francis turbine with exit guide vane |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360660A (en) * | 2020-11-06 | 2021-02-12 | 陕西省引汉济渭工程建设有限公司 | Long and short blade type reversible pump turbine |
| CN112360660B (en) * | 2020-11-06 | 2022-07-12 | 陕西省引汉济渭工程建设有限公司 | Long and short blade type reversible pump turbine |
| CN115405454A (en) * | 2022-08-31 | 2022-11-29 | 扬州大学 | Multifunctional mixed-flow water turbine and automatic adjusting system |
| CN115405454B (en) * | 2022-08-31 | 2024-04-16 | 扬州大学 | Multifunctional mixed-flow water turbine and automatic regulating system |
| CN115822839A (en) * | 2022-11-19 | 2023-03-21 | 江苏大学流体机械温岭研究院 | Energy recovery turbine draft tube with guide vanes |
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| Publication number | Publication date |
|---|---|
| CN109441691B (en) | 2020-07-28 |
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