CN108194258A - For the denoising device of blade, blade, wind power generating set and noise-reduction method - Google Patents
For the denoising device of blade, blade, wind power generating set and noise-reduction method Download PDFInfo
- Publication number
- CN108194258A CN108194258A CN201711443916.4A CN201711443916A CN108194258A CN 108194258 A CN108194258 A CN 108194258A CN 201711443916 A CN201711443916 A CN 201711443916A CN 108194258 A CN108194258 A CN 108194258A
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- Prior art keywords
- blade
- noise reduction
- reduction unit
- denoising device
- noise
- Prior art date
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Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 100
- 238000013461 design Methods 0.000 claims description 2
- 230000008602 contraction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- 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
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
-
- 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
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
- F05B2260/962—Preventing, counteracting or reducing vibration or noise by means creating "anti-noise"
-
- 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
Abstract
The present invention discloses a kind of for the denoising device of blade, blade, wind power generating set and noise-reduction method.The denoising device includes：Noise reduction unit has denoising structure；And driving portion, noise reduction unit is driven in the case where noise reduction unit is mounted at the trailing edge of blade body, so that noise reduction unit is stretched out or retracted relative to blade body.According to an embodiment of the invention by the pre-buried telescopic denoising device of blade trailing edge, various sizes of contraction being carried out under different wind speed, so as to achieve the purpose that equal noise reduction under different wind speed.
Description
Technical field
The invention belongs to the drops of wind-driven generator technical group field, more particularly to a kind of blade for wind power generating set
It makes an uproar device, the blade with the denoising device, the wind power generating set with the blade and noise-reduction method.
Background technology
With the development that domestic wind-powered electricity generation is swift and violent, installed capacity becomes larger, and the wind turbine of new clothes is from residential block or culture zone
It is increasingly nearer；And the reliability of wind turbine is higher and higher, and many wind turbines participate in the competition of international item, for residential block or cultivation
Area, external many wind fields propose noise relatively high requirement.
As country etc. of Australia, Europe or America, it is up to standard not require nothing more than maximum acoustic power level to noise level limit, together
When to the noise level finite value of unit under each wind speed；And existing noise reduction is directed to maximum noise and carries out at noise reduction substantially
Reason.
In general, existing noise reduction means are dropped by after blade has been manufactured, being pasted on the mode of blade trailing edge
It makes an uproar processing, the noise reduction width of this noise reduction mode is only limited near maximum noise, and some countries are to the requirement of most wind speed
Carry out whole noise reductions, in addition using reducing rotating speed or limit the means of Power operation and can meet the requirements, but can lose generated energy from
And influence income.
Invention content
According to an aspect of the present invention, a kind of denoising device for wind generator set blade, the noise reduction dress are provided
Put including：Noise reduction unit has denoising structure；And driving portion, in situation about being mounted on noise reduction unit at the trailing edge of blade body
Lower driving noise reduction unit, so that noise reduction unit is stretched out or retracted relative to blade body.
Noise reduction unit can include at least one of broached-tooth design and hair brush structure.
Driving portion can include eccentric wheel, cam, leading screw, cylinder or hydraulic cylinder.
Driving portion can include eccentric wheel or cam, and driving portion controls noise reduction unit by the rotation of eccentric wheel or cam
It stretches out or retracts.
Driving portion can also include elastomeric element, and one end of elastomeric element is connected to noise reduction unit, the other end of elastomeric element
For being fixed to blade body.
Denoising device can also include the support portion of support noise reduction unit, and support portion has channel, and noise reduction unit is stretched by channel
Go out the outside to blade body or the inside of blade body is retracted by channel.
According to another aspect of the present invention, a kind of blade for wind power generating set is provided, the blade is included as above
The denoising device and blade body, denoising device are arranged at the trailing edge of blade body.
Support portion can be fixed on blade body suction side and on the pressure side between.
In accordance with a further aspect of the present invention, a kind of wind power generating set is provided, the wind power generating set includes as above institute
The blade stated.
According to another aspect of the invention, a kind of noise-reduction method of the blade for wind power generating set, the wind are provided
Power generator group includes blade as described above, and the noise-reduction method includes being exposed to blade sheet according to wind speed to adjust noise reduction unit
The overhang of the outside of body.
The noise-reduction method can include：Senses wind speed；Control signal is sent to driving portion based on the wind speed sensed；It drives
Dynamic portion is exposed to the overhang of the outside of blade according to control signal control noise reduction unit.
Denoising device according to the present invention, the blade with the denoising device, the wind power generating set with the blade with
And noise-reduction method has at least one of following advantageous effects：
1st, it is carried out under different wind speed by telescopic denoising device pre-buried in blade according to an embodiment of the invention
Various sizes of contraction, so as to achieve the purpose that equal noise reduction under different wind speed.
2nd, the noise reduction unit of local damage can be replaced according to an embodiment of the invention, without reducing the rotating speed of blade
Or limit Power operation, additional income while meeting noise reduction demand.
Description of the drawings
Through a description of the embodiment given below with reference to the drawings, above and/or other objects and advantages of the invention will
It can become more fully apparent, wherein：
Fig. 1 shows the structure diagram of blade according to an embodiment of the invention；
Fig. 2 shows the close-up schematic views of " A " part in Fig. 1；
Fig. 3 shows the schematic diagram that denoising device according to an embodiment of the invention is located in blade body；
Fig. 4 and Fig. 5 respectively illustrates the close-up schematic view of " B " part in Fig. 3, wherein, Fig. 4 shows that noise reduction fills
It puts in stretching state, Fig. 5 shows that denoising device is in retracted mode；
Fig. 6 shows an exemplary schematic diagram of the support portion of denoising device according to an embodiment of the invention；
Fig. 7 shows another exemplary schematic diagram of the support portion of denoising device according to an embodiment of the invention.
The reference numerals are as follows：
100- blade 110- denoising device 111- support portion 111P- channel 112- noise reduction unit 113- driving portions 114-
Elastomeric element 1141- elastic component 1142- fixing component 120- blade body 121- leading edge 122- trailing edges.
Specific embodiment
To embodiment be described by referring to accompanying drawing below, to explain the present invention.However, the present invention can be with a variety of differences
Form implement, should not be understood as being limited to the exemplary embodiment herein proposed.
According to an embodiment of the invention, it is proposed that a kind of telescopic denoising device of new structure and with the noise reduction dress
The blade put.Generally speaking, when manufacturing blade, corresponding space, built-in telescopic drop are reserved in blade trailing edge
It makes an uproar device, different wind speed or rotating speed is reduced by controlling the extension elongation of noise reduction unit under different wind speed or under different rotating speeds
Noise, so as to meet the noise reduction demand under most wind speed.
Denoising device according to embodiments of the present invention may include noise reduction unit and driving portion.Noise reduction unit has denoising structure, uses
At the trailing edge for installing blade body of making an uproar, the driving portion driving drop in the case where noise reduction unit is mounted at the trailing edge of blade body
Make an uproar portion, so that noise reduction unit is stretched out or retracted relative to blade body.
As shown in Figures 1 to 7, denoising device 110 according to an embodiment of the invention includes support portion 111, noise reduction unit 112
With driving portion 113.Noise reduction unit 112 is supported by support portion 111, can completely or partially stretch out leaf under the driving of driving portion 113
The outside of piece ontology 120 or the inside for being retracted into blade body 120.
Support portion 111 is arranged on along the length direction of blade in blade trailing edge region in blade body 120 or blade sheet
Outside body 120.Support portion 111 can be with the channel 111P that noise reduction unit 112 slides through be made, and noise reduction unit 112 can be from channel
It is stretched out in 111P positioned at the outside of blade body 120, the inside of blade body 120 can also be retracted by channel 111P.
Driving portion 113 is controlled by control unit, noise reduction unit 112 can be controlled to reach the overhang outside blade body 120.
On support portion 111, a channel 111P (as shown in Figure 6) can be set so that multiple noise reduction units 112 can be with
It stretches out or retracts by channel 111P, multiple channel 111P (as shown in Figure 7) can also be set, multiple noise reduction units 112 can divide
To be multigroup, stretch out or retract by each channel 111P respectively.Similarly, support portion 111 can be one or more.
Support portion 111 can be integrally formed or be bolted together to be formed by multiple portions.For example, it can integrally manufacture
It provides the support portion 111 there are one channel or multiple channels or the multiple portions with channel can be stitched together
Form support portion 111.Support portion 111 can have rectangular shape, for example, with suitable length, width and thickness, with
By support portion 111 be fixed to 120 inside of blade body when the thickness of the trailing edge 122 of blade body 120 will not be impacted or
Person will not impact the aeroperformance of blade at the outside that support portion 111 is mounted on to blade body 120.
Support portion 111 can be formed by the relatively hard material such as engineering plastics or aluminium alloy, however, the present invention is unlimited
In this.Between support portion 111 being fixed on two panels housing when the Pressure side shell and suction side shell of blade mold,
Only support portion 111 can be fixed on Pressure side shell or suction side shell.
Noise reduction unit 112 can be noise reduction sawtooth or noise reduction hairbrush.According to different wind fields, difference can be selected
The sawtooth or bristle of shape, density, to meet the needs of different.
Driving portion 113 connect with noise reduction unit 112 and can be arranged on the inside of blade body 120, by driving noise reduction
Portion 112 stretches in channel 111P, can control noise reduction unit 112 in the overhang of the outside of blade body 120.Specifically, it drives
Dynamic portion 113 can be connected on the opposite end in the end with being provided with sawtooth or bristle of noise reduction unit 112.
Driving portion 113 can include hydraulic cylinder (for example, small cylinder) structure, and the live pole plug of hydraulic cylinder is connected to noise reduction unit
On 112, when needing that noise reduction unit 112 is made to stretch out from blade body 120, to hydraulic pressure oil supply cylinder, piston rod drive noise reduction unit 112 from
Blade body 120 is stretched out；When the external retraction for needing to make noise reduction unit 112 from blade body 120, make hydraulic cylinder release oil, it is living
Stopper rod drives noise reduction unit 112 to retract from the external of blade body 120.By controlling fuel delivery or releasing oil mass, noise reduction can be controlled
The overhang or retraction amount in portion.However, the present invention is not limited thereto, driving portion 113 can also include air cylinder structure.
In an embodiment of the present invention, driving portion 113 can also include screw structure, and the nut of leading screw can be fixed on noise reduction
In portion 112, the screw rod of leading screw is arranged in blade body 120.By control screw rod rotate in the forward direction or reversely rotate make drop
120 outside of the stretching of portion 112 blade body of making an uproar is retracted from 120 outside of blade body.
In an embodiment of the present invention, driving portion 113 can also include eccentric wheel structure or cam structure.In such case
Under, driving portion 113 can also include elastomeric element 114, and one end of elastomeric element 114 is connected to noise reduction unit 112, elastomeric element
114 other end is used to be fixed to blade body 120, so as to which noise reduction unit 112 be made to retract.
As shown in Figure 4 and Figure 5, elastomeric element 114 can include elastic component 1141 and fixing component 1142.Elastic component
1141 one end may be coupled on the medial end of noise reduction unit 112, and elastic component 1141 can be spring etc..Elastic component
1141 other end may be coupled to fixing component 1142, and fixing component 1142 may be coupled to blade body 120.Elastic component
1141 other end can also be directly connected on the interior side skin of blade.
The relationship between noise reduction unit 112, driving portion 113 and elastomeric element 114 is described below.
When driving portion 113 is cam structure, when needing that noise reduction unit 112 is made to stretch out from blade body 120, cam is controlled
Rotation angle push contact noise reduction unit 112 using the larger part of radius of cam, so as to push noise reduction unit 112 from blade sheet
Body 120 stretches out, and elastic component 1141 is elongated at this time；When the external retraction for needing to make noise reduction unit 112 from blade body 120,
Rotation cam makes cam radius is smaller to be partially toward noise reduction unit 112, and elastic component 1141 can spring back to drive noise reduction at this time
It retracts from the external of blade body 120 in portion 112.
In the non-limiting example of the present invention, elastomeric element 114 can include two elastic components 1141 and difference
Two fixing components 1142 being arranged on two elastic components 1141.Two elastic components 1141 can be connected to noise reduction unit
On 112 medial end, so as to further increase the kinetic stability of noise reduction unit 112.
In an embodiment of the present invention, denoising device 110 can be arranged at the trailing edge 122 of blade body 120, for example,
From blade tip in the length range in blade root direction general 1/3.
Denoising device 110 will on the pressure side can be placed in and on the pressure side set between suction side with when suction side molds
In blade body 120, for example, when manufacturing blade, blade trailing edge can reserve corresponding space, and denoising device
110 can be embedded in the reserved space of blade body 120.Specifically, can with the moulding of the good denoising device 110 of designed in advance,
Denoising device 110 is placed on corresponding position when completion molding is perfused in covering, is consolidated through molding rear support portion 111 with bonding agent
Chemical conversion type and be attached to blade body 120 on the pressure side and suction side, be arranged in blade body 120 so as to denoising device 110
Portion.
However, denoising device 110 and the set-up mode of blade body 120 are not particularly limited, for example, not influencing blade
Aerodynamic configuration in the case of, denoising device 110 can also be mounted on to the outside of blade body 120, for example, close to blade sheet
At the suction side of body 120.
In an embodiment of the present invention, since telescopic denoising device is arranged on inside blade body or mounted on blade
The outside of ontology, therefore can the length that noise reduction unit 112 is exposed to the outside of blade body 120 be adjusted according to different wind fields.
In addition, as described above, one end of the elastomeric element 114 of denoising device 110 is connected to noise reduction unit 112, and the other end
Blade body 120 is connected to, thus when local damage occurs in noise reduction unit 112, from the outside of blade 100 to the noise reduction unit of part
112 are replaced, and only noise reduction unit 112 need to be extractd from elastomeric element 114 and be pulled out from blade 100, replace new noise reduction
Portion.
In addition, in an embodiment of the present invention, support portion 111 also acts as the intensity to trailing edge 122 in blade body 120
The effect compensated.It can be to the intensity of trailing edge 122 at the trailing edge 122 of blade body 120 since denoising device 110 being arranged on
It impacts, therefore in order to not influence the intensity of trailing edge 122, it is preferable that sectional type is set in the preset range of trailing edge 122
Support portion 111 with multiple channel 111P.However, the present invention is not limited thereto, it can be arranged differently support portion as needed
111.Optionally, support portion 111 can be the part in blade body 120, that is, can be in blade body 120
It pre-sets the structure for being used to support noise reduction unit 112 or forms the channel 111P passed through for noise reduction unit to be made to stretch, this
In the case of, denoising device according to embodiments of the present invention can not include support portion 111.
In an embodiment of the present invention, it due to being provided with telescopic denoising device in blade, makes an uproar according under different wind speed
The requirement of sound adjusts the overhang that noise reduction unit is exposed to outside blade, therefore, it is possible to meeting the noise reduction demand under different wind speed.
The noise-reduction method of blade 100 as described above is described more fully below.
Research shows that under different wind speed, boundary layer turbulence scale can be different, so noise reduction unit needs different length,
And the noise-reduction method of the embodiment of the present invention can adjust noise reduction dress according to wind speed (using the wind speed in the environment of blade 100)
Put 110 noise reduction unit 112 be exposed to blade body 120 outside overhang.
Specifically, noise-reduction method according to an embodiment of the invention includes senses wind speed, sends control signal and adjustment
Noise reduction unit 112 is exposed to the overhang of the outside of blade 100.
First, using the wind measuring device before cabin top or wind turbine come senses wind speed；Then, fan master control system base
In the wind speed sensed control signal is sent to the driving portion 113 of denoising device 110；Finally, driving portion 113 is according to control signal
Adjustment noise reduction unit 112 is exposed to the overhang of the outside of blade 100.For example, after wind speed is sensed, fan master control system to
Driving portion 113 sends control signal, and the rotation angle such as eccentric wheel, the rotation angle of cam, silk are controlled based on control signal
The rotation amount of thick stick or the oil mass of small cylinder etc., with control noise reduction unit 112 be exposed to blade 100 outside overhang, such as wind
When speed is 6m/s, the length that control noise reduction unit 112 is exposed to outside blade 100 is 120mm；When wind speed is 7m/s, noise reduction is controlled
The length that portion 112 is exposed to outside blade 100 is 80mm；When wind speed is 8m/s, control noise reduction unit 112 is exposed to outside blade 100
The length in portion is 50mm；When wind speed is 9m/s, the length that control noise reduction unit 112 is exposed to outside blade 100 is 30mm.
Blade and noise-reduction method according to the present invention disclosure satisfy that by telescopic denoising device under different wind speed
Noise reduction demand.
Although some embodiments of the present invention have been described above, it should be appreciated by those skilled in the art,
Without departing from the principles and spirit of the present invention, can make change in these embodiments, the scope of the present invention by
Claim and its equivalent limit.
Claims (11)
1. a kind of denoising device for wind generator set blade, which is characterized in that the denoising device includes：
Noise reduction unit (112) has denoising structure；And
Driving portion (113), at by trailing edge (122) of the noise reduction unit (112) mounted on blade body (120) in the case of drive
The noise reduction unit (112) is moved, so that the noise reduction unit (112) is stretched out or retracted relative to the blade body (120).
2. denoising device as described in claim 1, which is characterized in that the noise reduction unit (112) is including broached-tooth design and hairbrush
At least one of structure.
3. denoising device as described in claim 1, which is characterized in that the driving portion (113) includes eccentric wheel, cam, silk
Thick stick, cylinder or hydraulic cylinder.
4. denoising device as described in claim 1, which is characterized in that the driving portion (113) includes eccentric wheel or cam, institute
State stretching or retraction that driving portion (113) controls the noise reduction unit (112) by the rotation of the eccentric wheel or the cam.
5. denoising device as claimed in claim 4, which is characterized in that the driving portion (113) further includes elastomeric element
(114), one end of the elastomeric element (114) is connected to the noise reduction unit (112), the other end of the elastomeric element (114)
For being fixed to the blade body (120).
6. the denoising device as described in any one of claim 1-5, which is characterized in that the denoising device further includes support institute
The support portion (111) of noise reduction unit (112) is stated, the support portion (111) has channel (111P), and the noise reduction unit (112) passes through
The channel (111P) reaches the outside of the blade body (120) or is retracted into the leaf by the channel (111P)
The inside of piece ontology (120).
7. a kind of blade for wind power generating set, which is characterized in that the blade is included such as any one of claim 1-6
The denoising device (110) and the blade body (120), the denoising device (110) are arranged on the blade body
(120) at the trailing edge (122).
8. blade as claimed in claim 7, which is characterized in that the support portion (111) is fixed on the blade body (120)
Suction side and on the pressure side between.
9. a kind of wind power generating set, which is characterized in that the wind power generating set includes leaf as claimed in claim 7 or 8
Piece.
10. the noise-reduction method of a kind of blade for wind power generating set, which is characterized in that the wind power generating set is included such as
Blade described in claim 7 or 8, the noise-reduction method are exposed to institute including adjusting the noise reduction unit (112) according to wind speed
State the overhang of the outside of blade body (120).
11. noise-reduction method according to claim 10, which is characterized in that the noise-reduction method includes：
Senses wind speed；
Control signal is sent to the driving portion (113) based on the wind speed sensed；
The driving portion (113) is exposed to the outside of the blade according to the control signal control noise reduction unit (112)
Overhang.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711443916.4A CN108194258B (en) | 2017-12-27 | 2017-12-27 | Noise reduction device for blade, wind generating set and noise reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711443916.4A CN108194258B (en) | 2017-12-27 | 2017-12-27 | Noise reduction device for blade, wind generating set and noise reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108194258A true CN108194258A (en) | 2018-06-22 |
| CN108194258B CN108194258B (en) | 2020-01-31 |
Family
ID=62584518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711443916.4A Active CN108194258B (en) | 2017-12-27 | 2017-12-27 | Noise reduction device for blade, wind generating set and noise reduction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108194258B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074082A (en) * | 2021-03-29 | 2021-07-06 | 扬州大学 | Chamfer sawtooth-porous coupling wing section |
| CN113833615A (en) * | 2020-06-23 | 2021-12-24 | 新疆金风科技股份有限公司 | Noise reduction device and wind generating set blade assembly |
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| CN101275536A (en) * | 2007-03-27 | 2008-10-01 | 通用电气公司 | Rotor blade for a wind turbine having a variable dimension |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113833615A (en) * | 2020-06-23 | 2021-12-24 | 新疆金风科技股份有限公司 | Noise reduction device and wind generating set blade assembly |
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| CN113074082A (en) * | 2021-03-29 | 2021-07-06 | 扬州大学 | Chamfer sawtooth-porous coupling wing section |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108194258B (en) | 2020-01-31 |
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