CN109139334A - A kind of mixed-flow deviated splitter vane hydraulic turbine - Google Patents
A kind of mixed-flow deviated splitter vane hydraulic turbine Download PDFInfo
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- CN109139334A CN109139334A CN201811190255.3A CN201811190255A CN109139334A CN 109139334 A CN109139334 A CN 109139334A CN 201811190255 A CN201811190255 A CN 201811190255A CN 109139334 A CN109139334 A CN 109139334A
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- hydraulic turbine
- guide vane
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- 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
- F03B3/02—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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses a kind of mixed-flow deviated splitter vane hydraulic turbine, the basin of crossing of the hydraulic turbine includes sequentially connected spiral case, guide vane domain, runner and draft tube；Wherein, runner bucket is made of several linear leafs and short blade interval, spiral case oval cross section length ratio is golden section, Guide vane profile is negative cruvature crescent, runner bucket is collectively constituted by long and short blade, and short blade and linear leaf inlet and outlet diameter difference ratio are 0.859, are equipped with cowling panel in tapered draft tube.The present invention is directed to realize efficiently using water flow energy, unit operation stability is promoted while improving hydraulic turbine working efficiency, is had broad application prospects and promotional value, China's small power station's transformation at present and each power station unit operation stability are improved significant.
Description
Technical field
The invention belongs to field of hydraulic machinery technology, more particularly to a kind of mixed-flow deviated splitter vane hydraulic turbine.
Background technique
Environment is the basic premise of human society survival and development, with the enhancing and sustainable development of mankind's environmental consciousness
Implementation, thermal power generation are gradually restricted, and another aspect new energy technology is immature to hinder such as wind-force, solar energy
And the development of nuclear power.In contrast, the hydroelectric generation of technology maturation is by favor, and water resource is renewable green energy resource.Water
The key of benefit power generation is unit performance, main indicator include to water flow can utilization efficiency, be related to unit safety operation and
The stability and cavitation performance in service life, the reason of influence These parameters, is hydraulic turbine interior flow field characteristic after all.Tool
There is the hydraulic turbine of good runnability that can not only meet the needs of small power station's transformation instantly, is also each power station development both at home and abroad
Inexorable trend.
Existing francis turbine runner is mostly blade consistent in length, and blade number is more to cause outlet of rotary wheel leaf spacing
It is relatively narrow to be easy to produce cavitation phenomenon, and blade is on the low side causes runner import leaf spacing excessive, it easily generates to be vortexed and causes flow field not
Stablize.The setting of deviated splitter vane in the hydraulic turbine, so that single blade mechanical load reduces, enhances so that blade amt amount increases
The integral strength performance of runner.Chinese patent application 201710822929.6 discloses a kind of crossflow turbine of deviated splitter vane
Runner, blade construction is simple, operation and maintenance are convenient, but there are problems that apparent unreasonable structural design, such as flow action
Area is small, and capacity for work is weak etc..Chinese patent application 201310704054.1 discloses a kind of mixed flow pump turbine, adopts
Secondary flow loss is reduced with the blade of three kinds of different lengths, but structure is complicated for which blade composition, processes installation cost
Height, and narrow leaf effect of distance runner conveyance capacity can further influence power output effect.
In conclusion improveing unit runner characteristic to improve Francis turbine operational efficiency, stability and cavitation performance
Be at present domestic and foreign scholars research hot spot direction, how overcome the deficiencies in the prior art, further improve or eliminate runner
Interior unstable fluidised form and its quadratic effect, while used mode of ameliorating meets the requirement for being easily worked manufacture, and can be into one
Step reduces hydraulic turbine overall cost and has become current power station hydraulic turbine field Important Problems urgently to be resolved.
Summary of the invention
A kind of mixed-flow deviated splitter vane water wheels are provided it is an object of the invention to overcome the shortcomings of the prior art
Machine can solve the hydraulic turbine flow field vortex problem on the basis of realizing that water flow can be converted efficiently to improve unit operation
Stability.
The present invention adopts the following technical scheme that realize:
The basin of crossing of a kind of mixed-flow deviated splitter vane hydraulic turbine, the hydraulic turbine includes sequentially connected spiral case, guide vane domain, turns
Wheel and draft tube；Wherein, runner bucket is made of several linear leafs and short blade interval, and runner bucket is that space three-dimensional distortion is bent
Face, divides equally on the linear leaf short transverse position of runner and intercepts four blade profile curved surfaces, and four blade profile curved surfaces, eight curves are quasi-
Equation is as follows after conjunction:
Curved surface I:
A:z=4597+81.21x+145.7y+0.3266x2+0.3919xy-0.2027y2
+3.783e-04x3-1.517e-05x2y+4.088e-04xy2-1.088e-03y3
B:z=5736+103.5x+162.4y+0.4433x2+0.4431xy-0.4343y2-5.514e-04x3
-6.234e-05x2y+4.228e-05xy2-9.456e-04y3
Curved surface II:
C:z=-4661-41.54x-41.52y-0.1215x2-0.1008xy-0.0368y2
-1.162e-04x3+6.523e-07x2y-2.538e-04xy2+2.794e-04y3
D:z=47360+492.7x+377.6y+1.633x2+0.8231xy-0.2759y2
-1.75e-03x3-5.929e-04x2y+1.862e-03xy2-2.808e-03y3
Curved surface III:
E:z=-28730-222.2x-141y-0.585x2-0.354xy-0.0439y2-5.212e-04x3
+1.347e-05x2y-8.291e-04xy2+1.099e-03y3
F:z=7320+71.38x+9.083y+0.2279x2-0.02838xy-0.1483y2
+2.428e-04x3-2.11e-04x2y+3.844e-05xy2-3.038e-04y3
Curved surface IV:
G:z=-71920-506.7x-167.6y-1.224x2-0.3355xy-0.1463y2
-1.015e-03x3+2.697e-04x3y-1.57e-03xy2+1.912e-03y3
H:z=28350+246.8x-48.92y+0.7256x2-0.4906xy+0.143y2
+7.282e-04x3-1.147e-04x3y+1.52e-03xy2-1.471e-03y3。
A further improvement of the present invention lies in that, which is characterized in that draft tube is tapered, interior to be equipped with cowling panel.
A further improvement of the present invention lies in that respectively interception curved surface molded line Central Plains point is in runner axis and guide vane domain upper surface
Point of intersection, guide vane domain upper surface are x/y plane, and it is the direction z that hydraulic turbine axis, which goes out to flow opposite direction,.
A further improvement of the present invention lies in that the short blade of runner exports bone linear diameter DSBone linear diameter is exported with linear leaf
DLRatio is 0.859, and runner short blade is equal with linear leaf number, and short blade and linear leaf number are respectively 7~9, long
Subtended angle of blade α=65 °~85 °.
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 spiral case surface area circumferentially direction change tendency equation are as follows: y=-
0.041x+0.239, spiral case cornerite are 315 °~335 °.
A further improvement of the present invention lies in that the guide vane in guide vane domain is uniformly distributed with single-row circular pattern, guide vane pitch circle diameter
DVWith runner inlet diameter DIRatio is 2.1916, guide vane throat diameter DTWith runner inlet diameter DIRatio is 0.0825, guide vane
Number is 16, the curved dies of guide vane are as follows: I:y=-0.053x2+64.22x+19191；J:y=-0.002x2-0.455x+
530。
Compared with prior art, the present invention has following beneficial technical effect:
First, deviated splitter vane proposed by the present invention is spaced apart formula runner, improves runner flow field characteristic, improves water wheels
Engine efficiency and operation stability；Runner diameter and blade angle reduce so that the variation reduction of vane inlet fluid flow angle, runner import
Cavitation performance be improved；The crescent-shaped blades structure is simple, facilitates production；And short blade is a part of linear leaf, it can
With equal dies in corresponding extension position processing, cost is reduced.
Second, deviated splitter vane proposed by the present invention is spaced apart formula runner, can reduce on the basis of guaranteeing identical power output
Runner integral diameter, and then reduce hydraulic turbine manufacturing cost；On the other hand, the reduction of runner diameter is beneficial to the drop of disc friction losses
It is low, to further improve hydraulic turbine operation efficiency.
Detailed description of the invention
Fig. 1 is a kind of mixed-flow deviated splitter vane hydraulic turbine structure schematic diagram proposed by the present invention.
Fig. 2 is the long and short Leaf positional distribution top view of runner.
Fig. 3 is runner linear leaf sectional view.
Fig. 4 is the long and short blade front view of runner.
Fig. 5 is negative cruvature Guide vane profile schematic diagram.
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 described in detail below in conjunction with drawings and examples.
It as shown in Figs. 1-5, is a kind of mixed-flow deviated splitter vane hydraulic turbine proposed by the present invention, including sequentially connected spiral case
1, guide vane 2, runner 4 and draft tube 7 with linear leaf 6 and short blade 5, wherein 1 section of spiral case is oval, and its length
Than for golden section, 1 cornerite of spiral case is 315 °~335 °.Guide vane 2 is uniformly distributed with single-row circular pattern, guide vane pitch circle diameter DV
With runner inlet diameter DIRatio is 2.1916, guide vane throat diameter DTWith runner inlet diameter DIRatio is 0.0825, guide vane
Number is 16.Runner bucket includes the equal linear leaf 6 of quantity, short blade 5, and spoon of blade is that space three-dimensional distorts curved surface, short
Blade exit bone linear diameter DSBone linear diameter D is exported with linear leafLRatio is 0.859, linear leaf wrap angle sigma=65 °~85 °, runner
Inlet height B3 and runner inlet diameter DIRatio is 0.096, discharge diameter of runner DPWith runner inlet diameter DIRatio is
0.513, tapered draft tube 7 is interior to be equipped with cowling panel 8.
As shown in figure 3, four curved surface curved dies of the linear leaf are as follows:
Curved surface I:
A:z=4597+81.21x+145.7y+0.3266x2+0.3919xy-0.2027y2
+3.783e-04x3-1.517e-05x2y+4.088e-04xy2-1.088e-03y3
B:z=5736+103.5x+162.4y+0.4433x2+0.4431xy-0.4343y2-5.514e-04x3
-6.234e-05x2y+4.228e-05xy2-9.456e-04y3
Curved surface II:
C:z=-4661-41.54x-41.52y-0.1215x2-0.1008xy-0.0368y2
-1.162e-04x3+6.523e-07x2y-2.538e-04xy2+2.794e-04y3
D:z=47360+492.7x+377.6y+1.633x2+0.8231xy-0.2759y2
-1.75e-03x3-5.929e-04x2y+1.862e-03xy2-2.808e-03y3
Curved surface III:
E:z=-28730-222.2x-141y-0.585x2-0.354xy-0.0439y2-5.212e-04x3
+1.347e-05x2y-8.291e-04xy2+1.099e-03y3
F:z=7320+71.38x+9.083y+0.2279x2-0.02838xy-0.1483y2
+2.428e-04x3-2.11e-04x2y+3.844e-05xy2-3.038e-04y3
Curved surface IV:
G:z=-71920-506.7x-167.6y-1.224x2-0.3355xy-0.1463y2
-1.015e-03x3+2.697e-04x3y-1.57e-03xy2+1.912e-03y3
H:z=28350+246.8x-48.92y+0.7256x2-0.4906xy+0.143y2
+7.282e-04x3-1.147e-04x3y+1.52e-03xy2-1.471e-03y3。
Realization principle of the invention is:
A kind of mixed-flow deviated splitter vane hydraulic turbine proposed by the present invention, is the dress that the energy of water flow is converted to mechanical energy
It sets.Its spiral case 1 uses oval cross section, and this structure can reduce pressure fluctuation in spiral case, water when running under off-design behaviour and flow through
Spiral case 1 enters guide vane 3；Guide vane 3 uses negative cruvature blade profile, and guide vane 3, which goes out to flow, enters runner envelope along 4 outer rim of runner；Runner 4 by
Linear leaf 6, the interval of short blade 5 composition being distributed on circumferencial direction, can guarantee that runner rotation generates torque under each operating condition in this way
Meanwhile 4 flow field turbulent structure of runner is improved, and hydraulic loss is reduced, thus improve efficiency and hydraulic turbine operation stability,
Blade 3 is fixed under runner crown between ring via welding manner, and water flow gradually subtracts from 4 import of runner to outlet pressure
It is small, finally flowed out via draft tube 7.
Embodiment
Runner includes short blade 5 and linear leaf 6 each 9, and it is 0.336 that deviated splitter vane, which goes out flow diameter ratio, linear leaf wrap angle sigma
=70 °.Runner linear leaf 6 is three-dimensional twisted curved surface, divides equally four sections according to bone line with blade height direction, dotted line is shown
Molded line where each section blades.
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 °.
Single-row negative cruvature guide vane is 16 uniformly distributed by circumferencial direction, 3 pitch circle diameter D of guide vaneVWith runner inlet diameter DIRatio
It is 2.1916,3 throat diameter D of guide vaneTWith runner inlet diameter DIRatio is 0.0825.
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 draft tube wall surface to flowing plate in hydraulic turbine axis2=9 °, rectify plate thickness
Control direction is β3=10 °, cowling panel number is 4.
By water force, according to calculated result it is found that deviated splitter vane of the present invention arrangement not only increases hydraulic turbine operation
Efficiency, and mitigate under each operating condition flow eddies phenomenon in rotary wheel of water turbine.Trapezoidal cowling panel setting prevents in draft tube
The further diffusion of outlet of rotary wheel vortex rope while so that draft tube energetic coefficient of restitution is promoted, enhances entire water wheels
Machine operation stability.
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 above specific embodiment and embodiment are to a kind of technology think of of the mixed-flow deviated splitter vane hydraulic turbine proposed by the present invention
The specific support thought cannot be limited the scope of protection of the present invention with this, it is all according to the technical idea provided by the invention, at this
Any equivalent variations or equivalent change done on the basis of technical solution belong to the range of technical solution of the present invention protection.
Claims (7)
1. a kind of mixed-flow deviated splitter vane hydraulic turbine, which is characterized in that the basin of crossing of the hydraulic turbine includes sequentially connected spiral case
(1), guide vane domain (2), runner (4) and draft tube (7)；Wherein, runner bucket is spaced by several linear leafs (6) and short blade (5)
Composition, runner bucket are that space three-dimensional distorts curved surface, and interception four is divided equally on linear leaf (6) short transverse position of runner (4)
A blade profile curved surface, equation is as follows after four blade profile curved surfaces, eight curve matchings:
Curved surface I:
A:z=4597+81.21x+145.7y+0.3266x2+0.3919xy-0.2027y2
+3.783e-04x3-1.517e-05x2y+4.088e-04xy2-1.088e-03y3
B:z=5736+103.5x+162.4y+0.4433x2+0.4431xy-0.4343y2-5.514e-04x3
-6.234e-05x2y+4.228e-05xy2-9.456e-04y3
Curved surface II:
C:z=-4661-41.54x-41.52y-0.1215x2-0.1008xy-0.0368y2
-1.162e-04x3+6.523e-07x2y-2.538e-04xy2+2.794e-04y3
D:z=47360+492.7x+377.6y+1.633x2+0.8231xy-0.2759y2
-1.75e-03x3-5.929e-04x2y+1.862e-03xy2-2.808e-03y3
Curved surface III:
E:z=-28730-222.2x-141y-0.585x2-0.354xy-0.0439y2-5.212e-04x3
+1.347e-05x2y-8.291e-04xy2+1.099e-03y3
F:z=7320+71.38x+9.083y+0.2279x2-0.02838xy-0.1483y2
+2.428e-04x3-2.11e-04x2y+3.844e-05xy2-3.038e-04y3
Curved surface IV:
G:z=-71920-506.7x-167.6y-1.224x2-0.3355xy-0.1463y2
-1.015e-03x3+2.697e-04x3y-1.57e-03xy2+1.912e-03y3
H:z=28350+246.8x-48.92y+0.7256x2-0.4906xy+0.143y2
+7.282e-04x3-1.147e-04x3y+1.52e-03xy2-1.471e-03y3。
2. a kind of mixed-flow deviated splitter vane hydraulic turbine according to claim 1, which is characterized in that draft tube (7) is tapered,
Cowling panel (8) are equipped in it.
3. a kind of mixed-flow deviated splitter vane hydraulic turbine according to claim 1, which is characterized in that in each interception curved surface molded line
Origin is in the point of intersection of runner axis and guide vane domain (2) upper surface, and guide vane domain (2) upper surface is x/y plane, and hydraulic turbine axis goes out
Stream opposite direction is the direction z.
4. a kind of mixed-flow deviated splitter vane hydraulic turbine according to claim 1, which is characterized in that the short blade of runner exports
Bone linear diameter DSBone linear diameter D is exported with linear leafLRatio is 0.859, and runner short blade (5) and linear leaf (6) number phase
It is respectively 7~9 Deng, short blade (5) and linear leaf (6) number, linear leaf (6) wrap angle sigma=65 °~85 °.
5. a kind of mixed-flow deviated splitter vane hydraulic turbine according to claim 1, which is characterized in that runner (4) inlet 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 mixed-flow deviated splitter vane hydraulic turbine according to claim 1, which is characterized in that spiral case (1) surface area
Circumferentially direction change tendency equation are as follows: y=-0.041x+0.239, spiral case (1) cornerite are 315 °~335 °.
7. a kind of mixed-flow deviated splitter vane hydraulic turbine according to claim 1, which is characterized in that the guide vane of guide vane domain (2)
(3) uniformly distributed with single-row circular pattern, 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, and guide vane (3) number is 16, the curved dies of guide vane (3) are as follows:
I:y=-0.053x2+64.22x+19191；J:y=-0.002x2-0.455x+530。
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|---|---|---|---|
| CN201811190255.3A CN109139334B (en) | 2018-10-12 | 2018-10-12 | Mixed-flow long-short blade water turbine |
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|---|---|---|---|
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| CN109139334B CN109139334B (en) | 2020-04-07 |
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ID=64811499
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439724A (en) * | 2019-08-07 | 2019-11-12 | 东方电气集团东方电机有限公司 | A kind of francis turbine runner for hydraulic |
| 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 |
| CN113915045A (en) * | 2021-10-18 | 2022-01-11 | 扬州大学 | Mixed-flow water turbine draft tube with inclined curved cone |
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| JP2009019532A (en) * | 2007-07-10 | 2009-01-29 | Tokyo Univ Of Science | Phase inversion cross-flow type super-small power generator |
| 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 |
| CN105927458A (en) * | 2016-05-31 | 2016-09-07 | 河海大学 | Ultralow-water head backflow type bell-shaped water turbine |
| CN107387290A (en) * | 2017-09-13 | 2017-11-24 | 河海大学 | A kind of crossflow turbine runner of deviated splitter vane |
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| JP2000054944A (en) * | 1998-08-05 | 2000-02-22 | Tokyo Electric Power Co Inc:The | Impeller |
| JP2009019532A (en) * | 2007-07-10 | 2009-01-29 | Tokyo Univ Of Science | Phase inversion cross-flow type super-small power generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439724A (en) * | 2019-08-07 | 2019-11-12 | 东方电气集团东方电机有限公司 | A kind of francis turbine runner for hydraulic |
| 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 |
| CN113915045A (en) * | 2021-10-18 | 2022-01-11 | 扬州大学 | Mixed-flow water turbine draft tube with inclined curved cone |
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| Publication number | Publication date |
|---|---|
| CN109139334B (en) | 2020-04-07 |
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