CN206487587U - Delay separation trailing edge blade - Google Patents
Delay separation trailing edge blade Download PDFInfo
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- CN206487587U CN206487587U CN201720101703.2U CN201720101703U CN206487587U CN 206487587 U CN206487587 U CN 206487587U CN 201720101703 U CN201720101703 U CN 201720101703U CN 206487587 U CN206487587 U CN 206487587U
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- trailing edge
- casing
- blade
- delay separation
- side wall
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- 238000000926 separation method Methods 0.000 title claims abstract description 67
- 238000010248 power generation Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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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
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Wind Motors (AREA)
Abstract
The utility model provides a kind of delay separation trailing edge blade, is related to technical field of wind power generation.Delay separation trailing edge blade includes blade body, casing and delay separation trailing edge.Blade body has tip, butt, leading edge and trailing edge.Casing is set on butt.Casing also includes wing fence and end plate, and wing fence is set in blade body close to the side of butt, and end plate is arranged between tank pressure side wall and casing suction sidewall, and delay separation trailing edge is connected to end sheet surface.Blade reduces the resistance that blade is subject to, improves the utilization ratio caught wind energy power, improve to wind energy of blade surface, can effectively improve the generating capacity of unit by setting casing and delay separation trailing edge.
Description
Technical field
The utility model is related to technical field of wind power generation, in particular to one kind delay separation trailing edge blade.
Background technology
At present, worldwide non-renewable energy resources tend to be exhausted, and the pollution that burning petroleum and coal are caused is
Jeopardize the existence of the mankind, the exploitation of green energy resource are increasingly paid attention to by every country.Current wind power industry is in
State has had begun to large-scale expansion.In past 10 years, China Wind Power generates electricity and is rapidly developed, and installed capacity is from 1990
20,000 kilowatts of year rise to 26.8 ten thousand kilowatts in 1999, to China Wind Power capacity of installed generator in 2010 more than 5,000,000 thousand
Watt, China is just turning into one of wind-power electricity generation most flourishing country in the world.
The low wind speed region wind-power electricity generation of China has been stepped into the large-scale development stage, but how to improve low wind speed regional generation
Efficiency, is always a problem.The strategy generally taken in the market is lengthened blades, increase rotor diameter and uses increase
The mode of tower height, these methods can obtain higher wind energy to a certain extent, improve the generating energy of wind power generating set
Power.But lengthened blades, increase tower height will certainly increase the weight of wind power generating set, and some part dimensions and weight also can
Increase therewith, a series of problems, such as thus also resulting in cost increase, transport difficult, influence unit safety.
The blade of wind power generating set is the critical component that wind power equipment converts wind energy into mechanical energy, and its manufacturing cost is about
Account for the 15% to 30% of wind power generating set totle drilling cost.Blade is typically based on Design of Aerodynamic Configuration and shows peculiar aerofoil profile, should
The lift-drag ratio of the blade of aerofoil profile is more big more can improve blower fan catch wind efficiency, and then improves the power output of blower fan.But blade is just
In normal operation process, the resistance that blade tip and blade root are subject to is larger, reduces the utilization ratio of wind energy.
Utility model content
The purpose of this utility model is to provide a kind of delay separation trailing edge blade, and it is intended at least partly to solve existing low
Wind speed generating set, the technical problem that resistance is larger, wind energy utilization efficiency is low that blade is subject to.
The technical scheme that the utility model is provided：One kind delay separation trailing edge blade includes blade body, casing and delay
Separate trailing edge；The blade body has tip, butt, leading edge and trailing edge；The casing is set on the butt；The case
Body has end plate；The delay separation trailing edge is connected to the end sheet surface；
The blade body includes the blade pressure side wall and vane suction sidewall being oppositely arranged, and the casing includes relative
The tank pressure side wall and casing suction sidewall of setting, tank pressure side wall are covered in blade pressure side wall, described
Casing suction sidewall is covered in the vane suction sidewall；
The casing also includes wing fence, and the wing fence is set in the blade body close to the side of the butt.
Further, the curved hardened structure of the wing fence, the wing fence surface is convex to the tip.
Further, the casing also includes end plate；Before the leading edge of tank pressure side wall, the blade body
Edge, the leading edge of the casing suction sidewall are sequentially connected and seamlessly transitted, trailing edge and the casing of tank pressure side wall
The trailing edge of suction sidewall passes through the end plate connection.
Further, the casing also includes multiple casing floors；The casing floor is disposed on the casing pressure
The inner side of power side wall and the casing suction sidewall.
Further, tank pressure side wall, blade pressure side wall, the casing suction sidewall, the blade
The outer surface of suction sidewall is seamlessly transitted.
Further, the cavity that tank pressure side wall, the casing suction sidewall are surrounded with the end plate, its section
Face area is tapered into from the butt to the sophisticated direction.
Further, the delay separation trailing edge is arranged on the end plate away from tank pressure side wall and the casing
The side of suction sidewall；The delay separates trailing edge along tank pressure side wall and the length direction of the casing suction sidewall
Extension.
Further, the section of the delay separation trailing edge is in the shape of the letter V shape；The tip of the delay separation trailing edge is away from institute
State tank pressure side wall and the casing suction sidewall.
The utility model provide delay separation trailing edge blade beneficial effect be：
First, casing is arranged on the butt of blade body, casing includes wing fence, and wing fence can stop to be produced at axial fan hub
Raw vortex, mitigates the resistance being subject in blade rotation process.The setting of casing can increase wind-engaging of the blade on butt surface
Area, improves adsorption capacity of the air-flow on butt surface, so that increase blade catches wind energy power.Secondly, in the end plate table of casing
Face sets delay separation trailing edge, and air-flow, can be at delay separation trailing edge smoothly through cutting when flowing through casing trailing edge direction
The weak vortex formed at casing trailing edge, can increase the lift of blade, reduce the resistance of blade, improve blade to wind energy
Utilization ratio.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, it will use below required in embodiment
Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
To obtain other related accompanying drawings according to these accompanying drawings.
First viewing angle constructions of the butt part for the delay separation trailing edge blade that Fig. 1 provides for the utility model embodiment show
It is intended to.
Fig. 2 separates the second viewing angle constructions schematic diagram of the butt part of trailing edge blade for Fig. 1 delay.
Fig. 3 is the structural representation of Fig. 1, Fig. 2 blade body.
Icon：100- delay separation trailing edge blades；200- blade suction surfaces；300- trailing edges；400- blade inlet edges；
110- blade bodies；111- butts；112- tips；120- casings；121- tank pressures side wall；122- casing suction sidewalls；
123- wing fences；124- end plates；130- delay separation trailing edges.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally here described in accompanying drawing and
The component of the utility model embodiment shown can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit requirement
The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
In description of the present utility model, it is to be understood that the orientation of the instruction such as term " on ", " under ", " interior ", " outer "
Or position relationship is that, based on orientation shown in the drawings or position relationship, or the utility model product is usually put when using
Orientation or position relationship, or the orientation that usually understands of those skilled in the art or position relationship, are for only for ease of description
The utility model and simplified description, rather than instruction or the signified equipment of hint or element must have specific orientation, Yi Te
Fixed azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
In addition, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that indicating or implying relatively important
Property.
In description of the present utility model, in addition it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set
Put ", " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected,
Or be integrally connected；Can be mechanical connection or electrical connection；Can be joined directly together, intermediary can also be passed through
It is indirectly connected to, can is the connection of two element internals.For the ordinary skill in the art, it can be managed with concrete condition
Solve concrete meaning of the above-mentioned term in the utility model.
Inventor has found that under normal conditions, during blade working, the air-flow of blade surface can form attachment nothing well
Separation flowing, the region in the boundary layer of blade and trailing edge is relatively thin, by factors such as attack angle of blade, vane airfoil profile and thickness
Influence, different degrees of released state, degree meeting that air-flow with blade separate just occur near edge for air-flow in front of the blade
Increase with the increase of the angle of attack, the air-flow of Disengagement zone can form larger vortex because aerofoil profile effect is lost, and transport blade
The increase of row resistance, utilization ratio of the reduction unit to wind energy.The delay separation trailing edge blade that the utility model is provided is by setting
Casing and delay separation trailing edge, can effectively obstruct the generation being vortexed on blade.
The first visual angle knot of the butt part for the delay separation trailing edge blade 100 that Fig. 1 provides for the utility model embodiment
Structure schematic diagram, refers to Fig. 1.It should be noted that the reference with arrow refers to surface or edge, non-band in all accompanying drawings
The reference of arrow refers to entity.
Present embodiments provide a kind of delay separation trailing edge blade 100.Blade 100 includes blade body 110, casing 120
Trailing edge 130 is separated with delay.Blade body 110 has butt 111 and sophisticated 112 (referring to Fig. 3).Casing 120 is set in root
On end 111.Casing 120 has end plate 124, and delay separation trailing edge 130 is connected to the surface of end plate 124.On the whole, delay separation tail
Edge blade 100 has aerodynamic configuration.
Fig. 2 is the second viewing angle constructions schematic diagram of the butt part of Fig. 1 delay separation trailing edge blade, refers to Fig. 2.
Casing 120 includes tank pressure side wall 121, casing suction sidewall 122, wing fence 123, the end plate 124 being oppositely arranged
With casing floor (not shown).
The edge of narrower side is trailing edge 300 on delay separation trailing edge blade 100, and the edge of wider side is blade
Leading edge 400.Blade inlet edge 400 is spliced by the leading edge of casing 120 and the leading edge of blade body 110.Trailing edge 300 is by case
The trailing edge of body 120 and the trailing edge of blade body 110 are spliced.It is then relative set between blade inlet edge 300 and trailing edge 400
The blade pressure surface (not shown) and blade suction surface 200 put.
Tank pressure side wall 121 is covered in the outside of blade pressure side wall 113 (referring to Fig. 3) by casing floor.Case
Body vane pressure sidewall 121, the outer surface of blade pressure side wall 113 are spliced to form blade pressure surface (not shown) (pressure
Side, PS face), also referred to as windward side.
Casing suction sidewall 122 is covered in the outside of vane suction sidewall 114 (referring to Fig. 3) by casing floor.Case
Body suction sidewall 122, the outer surface of vane suction sidewall 114 are spliced to form blade suction surface 200 (suction side, SS
Face), also referred to as lee face.
Tank pressure side wall 121, blade pressure side wall 113, casing suction sidewall 122, the appearance of vane suction sidewall 114
Face is seamlessly transitted.
The leading edge of tank pressure side wall 121 is connected with the leading edge of blade body 110, the leading edge of casing suction sidewall 122
It is connected with the leading edge of blade body 110, leading edge, the leading edge of blade body 110, the casing suction sidewall of tank pressure side wall 121
122 leading edge is sequentially connected and seamlessly transitted.The trailing edge and the trailing edge of casing suction sidewall 122 of tank pressure side wall 121 pass through
End plate 124 is connected.The trailing edge of casing 120 is blocked by end plate 124.
The cavity that tank pressure side wall 121, casing suction sidewall 122 and end plate 124 are surrounded, its area of section is from butt
111 taper into the direction of sophisticated 112 (referring to Fig. 3).So, the profile of casing 120 is made to be constructed with type, while its appearance
Face can be effectively improved the flow condition of air-flow, increase the adsorption capacity of air-flow.
Wing fence 123 is set on the butt 111 of blade body 110.Wing fence 123 is inhaled with tank pressure side wall 121 and casing
Power side wall 122 is installed with type.The curved hardened structure of wing fence 123, the surface of wing fence 123 is convex to sophisticated 112 side of blade body 110
To.In the rotary course of delay separation trailing edge blade 100, wing fence 123 is rotated with, and wheel hub direction is formed to a certain extent
Vortex plays barrier effect, alleviates the resistance to the rotation of delay separation trailing edge blade 100.
End plate 124 makes casing trailing edge have one fixed width, equivalent to casing trailing edge play a part of lengthen and widen, from
And increase effective wind area of delay separation trailing edge blade 100, the loss in efficiency at trailing edge 300 is reduced, and can
Effectively guiding air-flow is smoothly passed, and mitigates the vortex in the formation of casing rear edge part, and end plate 124 can play what is supported and reinforce
Effect.
Multiple casing floors are set in parallel in the inner side of tank pressure side wall 121 and casing suction sidewall 122, to casing
120 form internal support, form a cavity, and are installed with tank pressure side wall 121 and casing suction sidewall 122 with type.It is many
Individual casing floor serves the booster action in structure, it is to avoid may separate the root of trailing edge blade 100 in running in delay
There is fatigue, the phenomenon of cracking in portion, applies to low wind speed region, MW class, big blade Wind turbines, can effectively lift its hair
Electricity.
Delay separation trailing edge 130 is arranged on one of end plate 124 away from tank pressure side wall 121 and casing suction sidewall 122
Side.Delay separation trailing edge 130 extends along tank pressure side wall 121 and the length direction of casing suction sidewall 122.Delay separation tail
The section of edge 130 is in the shape of the letter V shape.The tip of delay separation trailing edge 130 is away from tank pressure side wall 121 and casing suction sidewall
122.Delay separation trailing edge 130 is set in the outer surface of casing 120, thus at the blade root of delay separation trailing edge blade 100
Form aerodynamic configuration.Delay separation trailing edge 130 is tilted from casing suction sidewall 122 to tank pressure side wall 121, and air-flow is being flowed through
During to casing trailing edge, can delay separation trailing edge 130 at smoothly through, weaken at casing trailing edge formed vortex.
Delay separation trailing edge blade 100 is during rotation, although the blade root of delay separation trailing edge blade 100 rotates speed
Degree is not high, but because root diameter (RD) is larger, the flow velocity of air-flow is also larger, simultaneously because the rotation of wheel hub, in confounding factor effect
Under, it can also produce the vortex of reduction blower fan service efficiency in leaf root part.Casing 120 and delay separation trailing edge are set at blade root
Structure as 130 can effectively suppress the generation of leaf root part vortex, and the operating efficiency of lifting delay separation trailing edge blade is carried
High unit generation amount.On the whole, delay separation trailing edge blade 100 has aerodynamic configuration.
Fig. 3 is the structural representation of Fig. 1, Fig. 2 blade body 110, refers to Fig. 3.
Blade body 110 has butt 111 and tip 112.Blade body 110 also includes the blade pressure side being oppositely arranged
Wall 113 and vane suction sidewall 114.The profile of blade body 110 can use NACA (National Advisory Committee for Aeronautics) system
Row aerofoil profile or self-defined series aerofoil sections.
In addition, the delay separation trailing edge blade 100 that the present embodiment is provided can pass through priming by vacuum, laminating, structure glue
It is prepared by the production technologies such as bonding, putty filling, polishing.
Casing 120 in the present embodiment can be effectively improved the flow condition of air-flow at blade root, suppress at blade root flow-disturbing and
The generation of whirlpool, reduces energy loss at blade root, while increasing the wind area of delay separation trailing edge blade, improves air-flow and is prolonging
The adsorption capacity on the slow surface of separate blade 100, improves the power output of original unit.The delay separation tail set in the present embodiment
Edge 130, air-flow, can be at delay separation trailing edge 130 smoothly through weakening in casing when flowing through casing trailing edge direction
The vortex formed at trailing edge, can increase the lift of blade, reduce the resistance of blade, improve utilization ratio of the blade to wind energy.
The delay separation trailing edge blade 100 that the present embodiment is provided is not only simple in structure, cost is relatively low, and according to wind field wind
Resource characteristicses, blade aerodynamic characteristic and unit performance characteristic, are meeting overall design load safety, the premise of Strength Safety
Under, by setting casing 120 and delay separation trailing edge 130, the resistance that delay separation trailing edge blade 100 is subject to is reduced, is improved
The utilization ratio caught wind energy power, improve to wind energy on the surface of delay separation trailing edge blade 100, can effectively improve unit
Generating capacity.
To ensure the security and validity of wind power generating set, calculating school is carried out to Wind turbines complete machine and blade
Core.Checking content includes：Blade loading and intensity, each draw bail intensity (containing bolt), blade frequencies, the major structural members of complete machine
Load and intensity, blade pitch device moment of torsion and intensity, bearing load and intensity, gear-box moment of torsion and intensity, generator torque and strong
Degree, tower load and intensity, given tensile load and bearing capacity, overall frequency, power curve and generated energy.Calculated and school more than
Core, it can be ensured that the security and validity of the wind power generating set.
The delay separation trailing edge blade 100 that the present embodiment is provided can be used for low wind speed region, MW class, big blade wind-powered electricity generation
Unit, especially power are in more than 1.5MW, while unit of the impeller diameter more than 77 meters, can effectively improve the hair of unit
Electric energy power.
Preferred embodiment of the present utility model is these are only, the utility model is not limited to, for this area
Technical staff for, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle within,
Any modification, equivalent substitution and improvements made etc., should be included within protection domain of the present utility model.
Claims (8)
1. one kind delay separation trailing edge blade, it is characterised in that the blade includes blade body, casing and delay separation tail
Edge；The blade body has tip, butt, leading edge and trailing edge；The casing is set on the butt；The casing has
End plate；The delay separation trailing edge is connected to the end sheet surface；
The blade body includes the blade pressure side wall and vane suction sidewall being oppositely arranged, and the casing includes being oppositely arranged
Tank pressure side wall and casing suction sidewall, tank pressure side wall is covered in blade pressure side wall, the casing
Suction sidewall is covered in the vane suction sidewall.
2. delay separation trailing edge blade according to claim 1, it is characterised in that the casing also includes wing fence, described
Wing fence is set in the blade body close to the side of the butt, the curved hardened structure of wing fence, the surface of the wing fence
It is convex to the tip.
3. delay separation trailing edge blade according to claim 1, it is characterised in that the casing also includes end plate；It is described
Leading edge, the leading edge of the blade body, the leading edge of the casing suction sidewall of tank pressure side wall are sequentially connected and smoothed
Cross, the trailing edge of tank pressure side wall and the trailing edge of the casing suction sidewall pass through the end plate connection.
4. delay separation trailing edge blade according to claim 1, it is characterised in that the casing also includes multiple casing ribs
Plate；The casing floor is disposed on the inner side of tank pressure side wall and the casing suction sidewall.
5. delay separation trailing edge blade according to claim 1, it is characterised in that tank pressure side wall, the leaf
Piece vane pressure sidewall, the casing suction sidewall, the outer surface of the vane suction sidewall are seamlessly transitted.
6. delay separation trailing edge blade according to claim 1, it is characterised in that tank pressure side wall, the case
The cavity that body suction sidewall is surrounded with the end plate, its area of section gradually becomes from the butt to the sophisticated direction
It is small.
7. delay separation trailing edge blade according to claim 1, it is characterised in that the delay separation trailing edge is arranged on institute
State side of the end plate away from tank pressure side wall and the casing suction sidewall；The delay separates trailing edge along the casing
Vane pressure sidewall and the extension of the length direction of the casing suction sidewall.
8. delay separation trailing edge blade according to claim 1, it is characterised in that the section of the delay separation trailing edge is in
V-shape；The tip of the delay separation trailing edge is away from tank pressure side wall and the casing suction sidewall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720101703.2U CN206487587U (en) | 2017-01-25 | 2017-01-25 | Delay separation trailing edge blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720101703.2U CN206487587U (en) | 2017-01-25 | 2017-01-25 | Delay separation trailing edge blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206487587U true CN206487587U (en) | 2017-09-12 |
Family
ID=59766135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720101703.2U Active CN206487587U (en) | 2017-01-25 | 2017-01-25 | Delay separation trailing edge blade |
Country Status (1)
| Country | Link |
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| CN (1) | CN206487587U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545465A (en) * | 2017-01-25 | 2017-03-29 | 北京博比风电科技有限公司 | Postpone to separate trailing edge blade |
| CN108150353A (en) * | 2017-12-25 | 2018-06-12 | 江苏金风科技有限公司 | Chord change device, blade, chord change control method and control system |
-
2017
- 2017-01-25 CN CN201720101703.2U patent/CN206487587U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545465A (en) * | 2017-01-25 | 2017-03-29 | 北京博比风电科技有限公司 | Postpone to separate trailing edge blade |
| CN108150353A (en) * | 2017-12-25 | 2018-06-12 | 江苏金风科技有限公司 | Chord change device, blade, chord change control method and control system |
| CN108150353B (en) * | 2017-12-25 | 2019-09-27 | 江苏金风科技有限公司 | Chord length changing device, blade, chord length changing control method and control system |
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