CN104389716B - Optimize the runner and be equipped with the Francis turbine of this runner in dry season of the number of blade - Google Patents
Optimize the runner and be equipped with the Francis turbine of this runner in dry season of the number of blade Download PDFInfo
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- CN104389716B CN104389716B CN201410494888.9A CN201410494888A CN104389716B CN 104389716 B CN104389716 B CN 104389716B CN 201410494888 A CN201410494888 A CN 201410494888A CN 104389716 B CN104389716 B CN 104389716B
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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
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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
- F03B3/02—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
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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
- F03B3/125—Rotors for radial flow at high-pressure side and axial flow at low-pressure side, e.g. for Francis-type turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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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
Optimize the runner and be equipped with the Francis turbine of this runner in dry season of the number of blade, comprise crown and lower ring and be arranged on multiple blades circumferentially uniform between described crown and lower ring, Qk: dry season mean flowrate; Qr: wet season rated discharge of hydraulic turbine; The ratio of K:Qk and Qr, K=Qk/Qr; △ Zr: wet season runner and dry season runner the difference of the number of blade; △ Zr and described K value negative correlation, namely K value is less, and △ Zr is larger.The present invention reduces the blade quantity on the runner being suitable for use in dry season, can when keeping runner bucket outlet in dry season aperture not reduce compared with wet season runner, significantly reduce rotary wheel of water turbine optimized operation district's inflow-rate of water turbine and the generation of foreign material blocking phenomenon between runner bucket when avoiding often occurring that water turbine set runs, be easy to runner manufacturing simultaneously, also can reduce runner water flow inside surface friction drag and be conducive to raising hydraulic efficiency.
Description
Technical field
The present invention relates to a kind of runner in dry season optimizing the number of blade, also relate to a kind of Francis turbine being provided with this runner.
Background technique
Through long-term technical development, Francis turbine finalizes the design almost.Due to Francis turbine compact structure, technology maturation, efficiency is higher, can adapt to very wide head scope, is to use the most a kind of water turbine at present.
Water turbine carries out Selection and Design, the hydraulic characteristic of incorporation engineering general arrangement and water turbine according to the hydraulic parameters in power station, according to the principle of advanced technology, economical rationality, selects and determine the technical parameter of water turbine.Architect's flow is generally chosen in optimum efficiency and 5% scope of exerting oneself between restraining line on combined characteristic (usually close to 5% exert oneself restraining line), to meet nominal output and load character.Because Francis Hydro Turbine Blades is unadjustable, for the runner that is determined through type selecting, can only efficient within the scope of certain range of flow and head, safe and stable operation.
In many middle-size and small-size plants without storage, due to the restriction by various condition, without balancing reservoir, can only with the fixed electricity of water.Flood season runoff amount accounts for annual large percentage, and unit is usually by hydraulic parameters type selecting in flood season.Dry season, to carry out flow less in river course, and power station often can not oepration at full load.When carrying out water flow and being less than normal operating flux (for less than 70% of rated flow) of separate unit water turbine, a kind of situation allows unit at the Smaller load area operation of off-design operating mode, not only efficiency significantly reduces, waterpower resourses are not fully utilized, often also can cause unit vibration, there is potential safety hazard; Another kind of situation is because off-design operating mode brings the safety problems such as unit vibration too much, can only shut down and abandon water, waste waterpower resourses.
In order to the waterpower resourses solving plant without storage dry season can not efficiency utilization problem, traditional method is the hydraulic parameters according to dry season, then increases a small capacity turbine-generator units, coordinates run with original unit.Increase small-load generators to need to transform facilities such as genuine room and diversion pipelines, not only investment is large, and the construction period is long, and uncertain factor is many, and also can impact the normal production and administration maintenance in power station.
In order to overcome Francis turbine away from problems such as the poor efficiency existed during optimum operating condition area operation and vibrations, also occurred that the blade design on runner is become the even more kinds of blade of length two or three by some in the market, as the patent of invention of China Patent No. CN201210524652.6, the day for announcing is on May 22nd, 2013, disclose mixed-flow type water, the runner of this kind of structure several is connected to blade design growth blade between crown and lower ring and short blade two kinds of structures; In addition, as the patent of invention of China Patent No. 201310704054.1, the day for announcing is on 04 02nd, 2014, disclose a kind of mixed flow pump turbine, the water turbine of this kind of structure to be arranged in the runner at middle part in spiral case, being become by blade design between crown and lower ring often to organize blade and be made up of a linear leaf, a middle linear leaf and two short blades, is long short-and-medium three kinds of blades by blade design.The former strives in the shape in space the Effec-tive Function scope expanding Francis turbine by change runner bucket, and the latter reduces the vortices breakdown of mixed flow pump turbine in feature " S " district as far as possible by adopting the compound mode of long, medium and short three kinds of blades.The two theory be all based on based on long-time running operating mode efficiently, take into account and improve short-term operation performance of operating condition, its advantage does not need to change runner, shortcoming is that the scope taken into account is very limited, is unsuitable for long, dry season time in dry season water flow and is less than the plant without storage of wet season rated flow 70%.
Summary of the invention
Technical problem to be solved by this invention is the deficiency overcoming above-mentioned prior art, provides a kind of runner and water turbine.
According to a kind of main technical schemes optimizing the runner employing in dry season of the number of blade provided by the invention be: comprise crown and lower ring and be arranged on multiple blades circumferentially uniform between described crown and lower ring,
Qk: dry season mean flowrate;
Qr: wet season rated discharge of hydraulic turbine;
The ratio of K:Qk and Qr, K=Qk/Qr;
△ Zr: wet season runner and dry season runner the difference of the number of blade;
The relation of described △ Zr and described K value is as following table:
| K | 0.6～0.7 | 0.5～0.6 | 0.4～0.5 | Less than 0.4 |
| △Z r(individual) | 2～3 | 3～4 | 4～5 | More than 5 |
△ Zr and described K value negative correlation, namely K value is less, and △ Zr is larger.
The runner in dry season of the optimization number of blade provided by the invention also can have following attached technical characteristics:
Zr: the number of blade on dry season runner;
Described Zr and the positive correlation of described K value, namely K value is less, and Zr is less.Described dry season, the number of blade Zr of runner was 7-11.
Multiple described blade is that circumference is evenly arranged,
Crown cornerite: the crown molded line of each described blade and the intersection point A of inlet side molded line, crown molded line are connected the angle that described intersection point A and intersection points B are formed with the intersection points B of Exit-edge molded line, described roller centre;
Lower ring cornerite: the lower ring-like line of each described blade and the intersection point C of inlet side molded line, lower ring-like line are connected the angle that described intersection point C and described intersection point D is formed with the intersection point D of Exit-edge molded line, described roller centre;
Described dry season, the crown cornerite of runner was 70-110 degree, and described dry season, the lower ring cornerite of runner was 50-80 degree.
Runner bucket flow channel of axial plane is surrounded by the crown molded line of described blade, inlet side molded line, Exit-edge molded line and lower ring-like line, and described dry season, the flow channel of axial plane area of runner bucket was less than the flow channel of axial plane area of described wet season runner bucket.
P point: the perpendicular intersection of the crown inner flow passage molded line inlet point of runner and the shaft center line of described runner;
D1: described P point to described dry season runner described exit edge of blade molded line and the distance of intersection point of crown molded line;
D2: described P point is to the distance of the intersection point of the described exit edge of blade molded line of described wet season runner and crown molded line;
Described d1 is greater than described d2.
P point: the perpendicular intersection of the crown inner flow passage molded line inlet point of runner and the shaft center line of described runner;
D3: described P point to described dry season runner described exit edge of blade molded line and the distance of intersection point of lower ring-like line;
D4: described P point is to the distance of the intersection point of the described exit edge of blade molded line of described wet season runner and lower ring-like line;
Described d3 is less than described d4.
The outlet gross area of described blade and the positive correlation of described K value, namely K value is less, and the outlet gross area is less.
The main technical schemes adopted according to a kind of Francis turbine provided by the invention is: comprise spiral case, seat ring, water distributor, runner and draft tube, described water turbine be provided with wet season runner or dry season runner, runner comprised crown and lower ring and was arranged on multiple blades circumferentially uniform between described crown and lower ring described dry season
Qk: dry season mean flowrate;
Qr: wet season rated discharge of hydraulic turbine;
The ratio of K:Qk and Qr, K=Qk/Qr;
△ Zr: wet season runner and dry season runner the difference of the number of blade;
The relation of described △ Zr and described K value is as following table:
| K | 0.6～0.7 | 0.5～0.6 | 0.4～0.5 | Less than 0.4 |
| △ Zr (individual) | 2～3 | 3～4 | 4～5 | More than 5 |
△ Zr and described K value negative correlation, namely K value is less, and △ Zr is larger.
Adopt the optimization number of blade provided by the invention dry season runner and the beneficial effect that brings of Francis turbine be:
When plant without storage crosses after machine flow significantly reduces dry season, for fully effectively utilizing water resources, improve the operational efficiency of water turbine off-design operating mode, under the prerequisite not changing other any mounted Component of Hydraulic Turbines, replace wet season runner with runner in dry season, plant without storage's unit in dry season efficient stable can be realized with most economical means and run;
By optimizing the inner flow channel of axial plane of runner and vane type line, the optimum district of runner hydraulic performance and actual motion district, power station are coincide, guarantee to cross after machine flow significantly reduces in dry season, the hydraulic performances such as efficiency, cavitation and hydraulic stability after water turbine uses runner in dry season have basic improvement;
The present invention reduces the blade quantity on the runner being suitable for use in dry season, when keeping runner bucket outlet in dry season aperture not reduce compared with wet season runner, can significantly reduce rotary wheel of water turbine optimized operation district's inflow-rate of water turbine and the generation of foreign material blocking phenomenon between runner bucket when avoiding often occurring that water turbine set runs.
The amount of finish of francis turbine runner and difficulty of processing and the positive correlation of runner bucket number, the blade quantity reducing runner in described dry season is easy to this runner manufacturing.
The present invention reduces the blade quantity of runner in described dry season, can reduce runner water flow inside surface friction drag, is conducive to improving hydraulic efficiency.
Accompanying drawing explanation
Fig. 1 is the structural drawing of runner of the present invention.
Fig. 2 is the structural drawing of runner Leaf of the present invention.
Fig. 3 is the schematic diagram of crown cornerite in runner of the present invention.
Fig. 4 is the schematic diagram of lower ring cornerite in runner of the present invention.
Fig. 5 is the structural drawing of water turbine of the present invention.
Fig. 6 be in water turbine of the present invention wet season runner and dry season runner the comparison diagram of flow channel of axial plane.
Fig. 7 be in water turbine of the present invention wet season runner and dry season runner efficiency comparison figure.
Fig. 8 be water turbine wet season runner of the present invention and dry season runner comparison diagram of exerting oneself.
Fig. 9 is the streamline distribution comparison diagram at water turbine wet season runner of the present invention and runner in dry season crown place when K=0.55.
Figure 10 is the pressure distribution comparison diagram at water turbine wet season runner of the present invention and runner in dry season crown place when K=0.55.
Figure 11 be water turbine wet season runner of the present invention and dry season runner bucket discharge area figure comparison diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
As shown in Figure 1 to 11, according to provided by the invention a kind of optimize the number of blade dry season runner embodiment, the multiple blades 3 comprising crown 1 and lower ring 2 and be arranged between described crown 1 and lower ring 2,
Qk: dry season mean flowrate;
Qr: wet season rated discharge of hydraulic turbine;
The ratio of K:Qk and Qr, K=Qk/Qr;
△ Zr: wet season runner and dry season runner the difference of the number of blade;
The relation of described △ Zr and described K value is as following table:
| K | 0.6～0.7 | 0.5～0.6 | 0.4～0.5 | Less than 0.4 |
| △Z r(individual) | 2～3 | 3～4 | 4～5 | More than 5 |
△ Zr and described K value negative correlation, namely K value is less, and △ Zr is larger.
The difference of runner between blade 3 quantity being suitable for wet season and use in the dry season of being suitable for provided by the invention meets the relation of above-mentioned list, can find out according to above-mentioned list, dry season, the number of blade Zr of runner 7 was less than wet season runner 10, can when keep dry season runner 7 blade 3 export aperture do not reduce compared with wet season runner, significantly reduce rotary wheel of water turbine optimized operation district's inflow-rate of water turbine and the generation of foreign material blocking phenomenon between runner bucket when avoiding often occurring that water turbine set runs, be easy to runner manufacturing simultaneously, also can reduce runner water flow inside surface friction drag to be conducive to improving hydraulic efficiency.
In order to obtain above-mentioned data of the present invention, we are according to the parameter such as net water head, flow of power station operation in dry season, Bound moisture turbine nominal diameter and rated speed, determine the optimum design operating point of runner of the present invention, and the quantity of runner bucket 3 is optimized according to optimum design operating point, for shape and the quantity of the blade 3 designed, carry out interior flow field CFD analysis; CFD analysis result is utilized to do to optimize further to the geometrical shape of blade 3 and quantity.Said process constantly circulates, until obtain satisfied design result.According to runner 7, Zr in dry season provided by the invention: dry season runner 7 the number of blade, described number of blade Zr and the positive correlation of described K value, namely K value is less, and Zr is less, and described number of blade Zr is 7-11.
Dry season provided by the invention, runner 7 was while minimizing number of blade Zr, take the aggregate measures strengthening subtended angle of blade θ, as shown in Figures 1 to 6, according to runner 7 in dry season provided by the invention, multiple described blade 3 is uniformly distributed in circumference, crown wrap angle 1: the crown molded line 31 of each described blade 3 and the intersection point A of inlet side molded line 32, crown molded line 31 are connected the angle that described intersection point A and intersection points B are formed with the intersection points B of Exit-edge molded line 33, described roller centre; Lower ring wrap angle 2: the lower ring-like line 34 of each described blade 3 and the intersection point C of inlet side molded line 32, lower ring-like line 34 are connected the angle that described intersection point C and described intersection point D is formed with the intersection point D of Exit-edge molded line 33, described roller centre.Dry season of the present invention, runner 7 subtended angle of blade θ and K was worth negative correlation, and K value is less, and θ is larger, and described dry season, runner 7 crown wrap angle 1 was 70-110 degree, can value be 75 degree, 77 degree, 88 degree, 89 degree, 100 degree; Described runner in dry season 7 times ring wrap angle 2 are 50-80 degree, can value be 55 degree, 57 degree, 62 degree, 64 degree, 77 degree.
As Fig. 5, Fig. 6, shown in Figure 11, according to the runner in dry season of the optimization number of blade provided by the invention, runner bucket flow channel of axial plane is by the crown molded line 31 of described blade 3, inlet side molded line 32, Exit-edge molded line 33 and lower ring-like line 34 surround, described dry season, the described blade flow channel of axial plane area (realizing part in Fig. 6) of runner 7 was less than the described blade flow channel of axial plane area (Fig. 6 dotted portion) of described wet season runner 10, when dry season, runner outer shape size was consistent with the boundary dimension of wet season runner in maintenance, runner bucket flow channel of axial plane is optimized according to optimum design operating point.By taking lower crown molded line 31 (increasing the distance of P point to B point) to runner in described dry season, higher lower ring-like line 34 (reducing the distance of P point to D point), the intersection point D of blade 3 outlet edge 33 and lower ring-like line 34 is moved to wait shorten outlet edge 33 technological means highly to the intake direction on limit 32 of blade 3, make sharf face runner-type line generation significant change compared with the sharf face runner-type line of wet season runner 10 of runner 7 in dry season in the present invention, improve the shrinkage of runner bucket flow channel of axial plane, reduce the blade exit gross area (product of blade exit area 35 and number of blade Zr), the outlet gross area of described blade and the positive correlation of described K value, namely K value is less, the outlet gross area is less, can effectively guarantee to cross after machine flow significantly reduces in dry season, the efficiency of water turbine, the hydraulic performance such as cavitation and hydraulic stability has basic improvement.
Interior flow field CFD analytical method is utilized to calculate through a large amount of, obtain being suitable for the wet season and period in dry season two kinds different flow runner bucket 3 and quantity, and calculate runner wet season and dry season working efficiency, exert oneself compare, the interior flow field of K value runner 0.55 time, result of calculation as shown in Figure 7 and Figure 8, at 70% (K=0.7) of wet season runner 10 rated flow with lower part, dry season, runner 7 demonstrated obvious odds for effectiveness, relative discharge in dry season (K value) is less, and difference is larger; Due to dry season runner 7 hydraulic efficiency gradually higher than wet season runner 10, therefore under same traffic, exert oneself and be also greater than wet season runner 10 gradually, relative discharge (K value) is less, and difference is larger.Fig. 9 is the streamline distribution comparison diagram at water turbine wet season runner 10 of the present invention and runner 7 in dry season crown place when K=0.55, after water flow in dry season significantly reduces, because most of current flow out from runner near lower ring, make too spacious wet season runner 10 runner between crown place two blade, produce the phenomenon of whirlpool, flow separation and secondary back.Dry season, runner 7 was by changing blade flow channel of axial plane, redesigning vane type line, the design parameter of runner and the running parameter in dry season is matched, thus shows flow field smoothly of flowing.Figure 10 is the pressure distribution comparison diagram at water turbine wet season runner 10 of the present invention and runner 7 in dry season crown place when K=0.55, after water flow in dry season significantly reduces, between wet season runner 10 crown place two blade, produce whirlpool, in figure, pressure minimum point is the center at whirlpool center.Dry season, runner 7 was by changing blade flow channel of axial plane, redesigning vane type line, the design parameter of runner and the running parameter in dry season is matched, thus eliminates whirlpool, improve flow field, showed very uniform pressure distribution.
As shown in Fig. 5 to Figure 11, a kind of embodiment of Francis turbine is also provided according to the present invention, comprise spiral case 4, seat ring 8, water distributor 5, runner and draft tube 6, described water turbine is provided with the wet season runner 10 that is suitable for the wet season or the runner 7 in dry season being suitable for dry season, and described dry season, runner 7 was the runner of above-described embodiment.Water turbine of the present invention according to river when the wet season different with dry season cross machine flow, especially guarantee to cross after machine flow significantly reduces in dry season, the hydraulic performances such as the efficiency of water turbine, cavitation and hydraulic stability can be made to have basic improvement; The present invention reduces the blade quantity on runner 7 in dry season, can when maintenance runner 7 blade exit aperture in dry season 35 reduce compared with wet season runner 10, significantly reduce rotary wheel of water turbine optimized operation district's inflow-rate of water turbine and the generation of foreign material blocking phenomenon between runner bucket when avoiding often occurring that water turbine set runs, be easy to runner manufacturing simultaneously, also can reduce runner water flow inside surface friction drag and be conducive to raising hydraulic efficiency.
As shown in Figure 1 and Figure 5, according to Francis turbine provided by the invention, the wet season runner 10 be equipped with and dry season runner 7 there is identical outside fit dimension.
Claims (8)
1. optimize a runner in dry season for the number of blade, comprise crown and lower ring and be arranged on multiple blades circumferentially uniform between described crown and lower ring, it is characterized in that:
Qk: dry season mean flowrate;
Qr: wet season rated discharge of hydraulic turbine;
The ratio of K:Qk and Qr, K=Qk/Qr;
△ Zr: wet season runner and dry season runner the difference of the number of blade;
The relation of described △ Zr and described K value is as following table:
△ Zr and described K value negative correlation, namely K value is less, and △ Zr is larger.
2. the runner in dry season optimizing the number of blade as claimed in claim 1, is characterized in that:
Zr: the number of blade on dry season runner;
Described Zr and the positive correlation of described K value, namely K value is less, and Zr is less; Described dry season, runner bucket number Zr was 7-11.
3. the runner in dry season optimizing the number of blade as claimed in claim 1, is characterized in that: multiple described blade is that circumference is evenly arranged,
Crown cornerite: the crown molded line of each described blade and the intersection point A of inlet side molded line, crown molded line are connected the angle that described intersection point A and intersection points B are formed with the intersection points B of Exit-edge molded line, described roller centre;
Lower ring cornerite: the lower ring-like line of each described blade and the intersection point C of inlet side molded line, lower ring-like line are connected the angle that described intersection point C and described intersection point D is formed with the intersection point D of Exit-edge molded line, described roller centre;
Described dry season, the crown cornerite of runner was 70-110 degree, and described dry season, the lower ring cornerite of runner was 50-80 degree.
4. the runner in dry season optimizing the number of blade as claimed in claim 1, it is characterized in that: runner bucket flow channel of axial plane is surrounded by the crown molded line of described blade, inlet side molded line, Exit-edge molded line and lower ring-like line, described dry season, the flow channel of axial plane area of runner bucket was less than the flow channel of axial plane area of described wet season runner bucket.
5. the runner in dry season optimizing the number of blade as claimed in claim 3, is characterized in that:
P point: the perpendicular intersection of the crown inner flow passage molded line inlet point of runner and the shaft center line of described runner;
D1: described P point to described dry season runner the described Exit-edge molded line of described blade and the distance of the intersection point of crown molded line;
D2: described P point is to the distance of the intersection point of the described Exit-edge molded line of the described blade of described wet season runner and crown molded line;
Described d1 is greater than described d2.
6. the runner in dry season optimizing the number of blade as claimed in claim 3, is characterized in that:
P point: the perpendicular intersection of the crown inner flow passage molded line inlet point of runner and the shaft center line of described runner;
D3: described P point to described dry season runner the described Exit-edge molded line of described blade and the distance of the intersection point of lower ring-like line;
D4: described P point is to the distance of the intersection point of the described Exit-edge molded line of the described blade of described wet season runner and lower ring-like line;
Described d3 is less than described d4.
7. the runner in dry season optimizing the number of blade as claimed in claim 1, it is characterized in that: the outlet gross area of described blade and the positive correlation of described K value, namely K value is less, and the outlet gross area is less.
8. a Francis turbine, comprise spiral case, seat ring, water distributor, runner and draft tube, it is characterized in that: described water turbine is provided with runner in dry season, the described runner in dry season that dry season, runner was the optimization number of blade described in any one of claim 1-7.
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| CN201410494888.9A CN104389716B (en) | 2014-09-24 | 2014-09-24 | Optimize the runner and be equipped with the Francis turbine of this runner in dry season of the number of blade |
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| CN201410494888.9A CN104389716B (en) | 2014-09-24 | 2014-09-24 | Optimize the runner and be equipped with the Francis turbine of this runner in dry season of the number of blade |
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| CN104389716A CN104389716A (en) | 2015-03-04 |
| CN104389716B true CN104389716B (en) | 2015-09-16 |
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|---|---|---|---|---|
| SU528383A1 (en) * | 1973-07-16 | 1976-09-15 | Ордена Трудового Красного Знамени Сызранский Завод Тяжелого Машиностроения | Impeller radial-axial hydraulic machines |
| US5997242A (en) * | 1996-12-02 | 1999-12-07 | Alden Research Laboratory, Inc. | Hydraulic turbine |
| CN2665392Y (en) * | 2003-07-25 | 2004-12-22 | 北京红树冠杰科技有限公司 | Mixed flow turbine rotary wheel |
| CN101482083A (en) * | 2009-01-22 | 2009-07-15 | 河海大学 | Ultra-low specific speed mixed-flow type turbine |
| CN202073680U (en) * | 2011-06-17 | 2011-12-14 | 杭州诚德发电设备有限公司 | Water turbine with double adjustable runners |
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| CN104389716A (en) | 2015-03-04 |
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