CN105508150B - A kind of pneumatic equipment bladess based on Fractals design - Google Patents
A kind of pneumatic equipment bladess based on Fractals design Download PDFInfo
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- CN105508150B CN105508150B CN201510976933.9A CN201510976933A CN105508150B CN 105508150 B CN105508150 B CN 105508150B CN 201510976933 A CN201510976933 A CN 201510976933A CN 105508150 B CN105508150 B CN 105508150B
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- blade
- shape
- trailing edge
- pneumatic equipment
- equipment bladess
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Classifications
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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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- 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
- F05B2280/00—Materials; Properties thereof
- F05B2280/40—Organic materials
- F05B2280/4011—Organic materials not otherwise provided for
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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
-
- 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
Abstract
The present invention relates to a kind of pneumatic equipment bladess based on Fractals design.The pneumatic equipment bladess include blade body and blade divides shape trailing edge, wherein, blade body is the front portion for being located at blade relative to direction of flow, blade divides the rear portion that shape trailing edge is located at blade relative to direction of flow, multiple holes are distributed with blade point shape trailing edge, this some holes runs through the pressure face and suction surface of whole pneumatic equipment bladess.The structure of the present invention is simple, and the mechanism for suppressing stall is easily achieved, and is substantially reduced compared to the device of passive control stalling characteristics, its cost.
Description
Technical field
The present invention pertains generally to wind power generation field, in particular to a kind of pneumatic equipment bladess based on Fractals design
Trailing edge structures, the trailing edge structures with this design can improve the stalling characteristics of pneumatic equipment bladess.
Background technology
Wind Energy In China aboundresources, wind-power electricity generation is greatly developed to readjusting the energy structure, ensureing energy security, reply weather
Change and promote Sustainable Socioeconomic Development it is significant, wherein wind energy conversion system as wind-power electricity generation key equipment for
China's Wind Power Development plays effect of crucial importance.Pneumatic equipment bladess determine the height of its wind energy utilization efficiency, are whole wind-force
The core component of machine.
When the blade incoming angle of attack increases to stall condition, gas no longer adheres to blade surface and flowed through, but will be inhaled in blade
Flow separation occurs for power face, and vortex occurs in the trailing edge of suction surface, and lift reduces suddenly, i.e., so-called " stall " phenomenon.When
When wind energy conversion system is in stall conditions, not only reduces blade aerodynamic efficiency, influence wind energy conversion system energy capture, and noise can increase suddenly
Greatly, phenomena such as and causing vibration and the fluctuation of service of pneumatic equipment bladess.Therefore it is special to improve pneumatic equipment bladess stall as much as possible
Property to improve wind energy conversion system operational efficiency and reduce the incidence of the noise pollution as caused by wind energy conversion system and wind energy conversion system accident, be very
It is necessary and there is important social effect and economic implications.
Pneumatic equipment bladess stalling characteristics are mainly improved using passive control mode at present.Such as patent, " a kind of adjustable vane is attacked
Angie type the vertical axis windmill " (patent No.：201210283518.1), it is sent out by adjusting attack angle of blade to improve vertical-shaft wind
The stalling characteristics of motor；A kind of wind power generating set (patent No. with stall-adjusted：20132055243.1), it passes through tune
The axis of oscillation of axis of runner blade and installing plate is saved, makes it ensure in side windward at an acute angle to reach the purpose of regulation stall.
But as maximization and Large Copacity development trend is gradually presented in wind energy conversion system, passively cost increases needed for control for stall
It is high.So as to by the way of active control, the generation principle based on stall, take respective design to improve the stall of wind energy conversion system
Characteristic seems most important for wind energy conversion system stall-adjusted.
The content of the invention
It is an object of the invention to provide a kind of pneumatic equipment bladess trailing edge structures based on Fractals design, and it can overcome existing
There are certain or some defects of technology.
Include blade body according to the pneumatic equipment bladess designed based on Fractals of the present invention and blade divides shape trailing edge, blade
Main body is located at the front portion of blade relative to direction of flow, and blade divides the rear portion that shape trailing edge is located at blade relative to direction of flow,
Multiple holes are distributed with blade point shape trailing edge, this some holes runs through the pressure face and suction surface of whole blade.
The present invention can improve the stalling characteristics of pneumatic equipment bladess and simple in construction and easy implementation, compared to passive control
The device of stalling characteristics processed, its cost substantially reduce.
In one particular embodiment of the present invention, blade divides the scope of shape trailing edge to be from wind energy conversion system leaf based on direction of flow
The five of the wing chord of piece/start everywhere to blade tail end.Blade body and blade divide this arrangement of shape trailing edge simple,
It is easy to implement, it is cost-effective.
In one particular embodiment of the present invention, the shape in multiple holes that blade divides on shape trailing edge has with its distribution shape
There is self-similarity (that is, being to be designed based on Fractals, form self-similar structure), and this some holes divides shape on shape trailing edge in blade
Divide shape network into through suction surface and pressure face and perpendicular to the wing chord of pneumatic equipment bladess.The blade of the present invention divides shape tail
Point shape network on edge is more also easy to produce microturbulence disturbance so as to reach preferably delay leaf compared with common network
The effect of the formation of piece suction surface stall group, active control effectively can be carried out to pneumatic equipment bladess stall.
In one particular embodiment of the present invention, multiple holes on blade point shape trailing edge be shaped as be based on any one
Point shape of geometric figure, which derives, to be formed, and the shape in hole is chosen according to the shape of the structure of different leaves trailing edge, as long as meeting
Point shape of shape grid mesopore and the distribution shape in hole have self-similarity and can pass through wind.
Preferably, the shape of cross section in multiple holes on blade trailing edge is rectangle.It will be understood by those skilled in the art that
The shape of cross section in the hole on blade trailing edge is not limited thereto, and its shape is chosen according to the structure of different leaves trailing edge,
As long as meeting point shape of shape grid mesopore and the distribution shape in hole has self-similarity and can pass through wind.
In one particular embodiment of the present invention, blade body and blade trailing edge are made by glass steel material, glass
The intensity of Steel material is high, in light weight and ageing-resistant.
Further, glass fibre is tied with the surface of blade body and is coated with epoxy resin, and blade body
Other parts be filled with foamed plastics.So so that pneumatic equipment bladess reduce total quality while with stability,
So that blade also increases wind catching area while rigidity is met.
The characteristics of pneumatic equipment bladess of the present invention are based on point shape grid and design, it, which provides one kind, can improve wind
The blade construction of the stalling characteristics of power machine blade, and it is simple in construction and easily manufactured.
Brief description of the drawings
Fig. 1 is the profile for the aerofoil profile for showing the pneumatic equipment bladess of the present invention；
Fig. 2 divides the direction view of shape grid for the A in Fig. 1 into blade point shape trailing edge；
Fig. 3 is the schematic diagram of the aerofoil profile angle of attack；And
Fig. 4 is operation principle schematic diagram of the present invention.
In accompanying drawing：
1：Blade body；2：Blade divides shape trailing edge；3：The angle of attack；4：Incoming；
5：Wing chord 6：Blade pressure surface；7：Blade suction surface；8：Stall group；
9：Microturbulence.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings, but the present invention should not be limited with this
The protection domain of patent.
Fig. 1 is the profile for the aerofoil profile for showing a kind of wind turbine blade structure based on Fractals design of the present invention.
The aerofoil profile of pneumatic equipment bladess in present example is applied in wide Dutch DU family of aerofoil sections using current wind-powered electricity generation industry
DU40, but the present invention airfoil structure be not limited to this.
As shown in Figure 1, pneumatic equipment bladess of the invention mainly include blade body 1 and blade divides shape trailing edge 2.
Blade body 1 can be glass steel material, and blade divides shape trailing edge 2 to be glass steel material, glass steel material
The characteristics of for intensity it is high, in light weight and ageing-resistant.Glass fibre can be tied with the surface of fiberglass and can be coated with
Epoxy resin, other parts then can be such to be arranged such that blade reduces while with stability with filling foamed plastics
Quality, and the blade is also increased wind catching area while rigidity is met.
Referring now still to Fig. 1, be formed as vertical on blade point shape trailing edge 2 formed with multiple holes, this multiple hole on blade trailing edge 2
Directly in the wing chord 5 of pneumatic equipment bladess as shown in Figure 3, and penetrating blade divides the network structure of shape trailing edge 2.
Fig. 2 is that blade divides the upward grid specific example figures of the A of shape trailing edge 2 in Fig. 1, and shape trailing edge 2 is divided in multiple holes in blade
Upper formation divides shape network, i.e. the distribution shape in hole and the shape in hole have self-similarity, the hole cross section wherein in example
It is shaped as rectangle.Based on Hurst and Vassilicos et al. discovery, divide shape network compared to common network in mistake
Microturbulence is more also easy to produce in the case that flow area is the same, describes in detail to form microturbulence later with reference to Fig. 4
Specific use.It will be understood by those skilled in the art that the shape in hole is not limited to rectangle as shown in Figure 2, it can also be it
Its geometry, its shape are chosen according to the structure of different leaves trailing edge, if meet point shape of shape grid mesopore with
The distribution shape in hole has self-similarity and can pass through wind.
Fig. 3 is the schematic diagram for the aerofoil profile angle of attack for showing the pneumatic equipment bladess of the present invention, wherein, the aerofoil profile angle of attack 3 is defined as
Angle between incoming 4 and wing chord 5.
From the figure 3, it may be seen that blade body 1 divides shape trailing edge 2 relative to incoming 4 (that is, the blowing direction of wind) positioned at front portion, blade
It is located at rear portion relative to incoming 4 (that is, the blowing direction of wind).In the wing chord 5 of pneumatic equipment bladess, (Fig. 4 shows blade point shape trailing edge 2
Go out) direction on account for 1/5th of pneumatic equipment bladess, but the present invention is not limited thereto, compares between blade body and blade trailing edge
Example relation is configured according to different wind energy conversion system blade profiles.
Fig. 4 is the operation principle schematic diagram of the present invention, shows that the stall of the active control pneumatic equipment bladess of the present invention is special
The operation principle of property.
It is well known in the art that when the aerofoil profile angle of attack increases to certain numerical value, the afterbody of blade suction surface 7 nearby will
There is stall group 8, therefore, the aerofoil profile angle of attack now is referred to as stall angle.
Importantly, the angle of attack that increase stall group 8 occurs as far as possible.As shown in figure 4, when the aerofoil profile angle of attack 3 reaches stall angle
When, its suction surface 7 will produce stall group 8.But according to the present invention, Fractals are used due to dividing to be provided with shape trailing edge 2 in blade
The grid framework of design, find that the grid frame structure of the type is compared to general by Hurst and Vassilicos etc. experiment
Logical grid framework is more also easy to produce microturbulence 9, and microturbulence 9 can postpone the generation of stall group 8, so as to increase stall
The angle of attack.
Further, it is as follows can to postpone the cardinal principle that stall is rolled into a ball for point shape grid frame structure：Blade pressure surface 6
Gas pressure differences, the relatively low blade suction surface 7 of pressure is flowed to by point shape network of blade point shape trailing edge 2, and
Generate microturbulence 9.The microturbulence 9 will disturb the flow field for producing stall and rolling into a ball 8 regions, so that stall group 8 is more difficult to
Formed, and reach the generation for delaying stall group 8, increase the purpose of stall angle.
It is therefore, of the invention by the way that wind energy conversion system often is designed as into a point shape grid frame structure with the trailing edge of DU40 airfoil fans,
The principle of microturbulence is also easy to produce according to point shape grid, it is produced microturbulence in blade suction surface trailing edge and is disturbed production
Raw stall group region flow field, suppress stall group and produce, improve pneumatic equipment bladess stalling characteristics so as to reach increase stall angle
Purpose, and its is simple in construction, is easy to implement, it is cost-effective, active control effectively can be carried out to pneumatic equipment bladess stall.
The better embodiment of the present invention is these are only, is not used for limiting the practical range of the present invention.Any institute
Has usually intellectual in category technical field, in the thinking and scope for not departing from the present invention, when various change and change can be made
It is logical, therefore protection scope of the present invention should be defined by claims institute confining spectrum.
Claims (4)
1. a kind of pneumatic equipment bladess, including blade body (1) and blade divide shape trailing edge (2), wherein, blade body (1) is relative
It is located at the front portion of blade in direction of flow, blade divides the rear portion that shape trailing edge (2) is located at blade relative to direction of flow, in blade point
Multiple holes are distributed with (2) in shape trailing edge, and this some holes runs through the pressure face (6) and suction surface (7) of whole pneumatic equipment bladess；
Wherein, the shape in multiple holes on blade point shape trailing edge (2) has self-similarity with its distribution shape, and this some holes exists
Blade divides on shape trailing edge (2) point for forming the wing chord (5) through suction surface (7) with pressure face (6) and perpendicular to pneumatic equipment bladess
Shape network；
Wherein, point shape being shaped as based on any one geometric figure in multiple holes on blade point shape trailing edge (2), which derives, forms,
The shape in hole is chosen according to the shape of the structure of different leaves trailing edge, as long as meeting point shape of shape grid mesopore and hole
Distribution shape has self-similarity and can pass through wind.
2. pneumatic equipment bladess according to claim 1, wherein, blade divides the scope of shape trailing edge (2) to be based on direction of flow
Since the five of the wing chord (5) of pneumatic equipment bladess/everywhere to blade tail end.
3. pneumatic equipment bladess according to claim 1, wherein, blade body (1) is made up of glass steel material, and in leaf
Glass fibre is tied with the surface of piece main body (1) and is coated with epoxy resin.
4. pneumatic equipment bladess according to claim 1, wherein, blade point shape trailing edge (2) is made up of glass steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510976933.9A CN105508150B (en) | 2015-12-23 | 2015-12-23 | A kind of pneumatic equipment bladess based on Fractals design |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510976933.9A CN105508150B (en) | 2015-12-23 | 2015-12-23 | A kind of pneumatic equipment bladess based on Fractals design |
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| CN105508150A CN105508150A (en) | 2016-04-20 |
| CN105508150B true CN105508150B (en) | 2018-04-03 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106321366A (en) * | 2016-10-09 | 2017-01-11 | 上海理工大学 | Vertical axis wind machine tower of fractal structure |
| CN108268737A (en) * | 2018-01-30 | 2018-07-10 | 上海理工大学 | Imitative palm tree windmill tower frame and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006299818A (en) * | 2005-04-15 | 2006-11-02 | Fuji Heavy Ind Ltd | Windmill blade, horizontal axis windmill, surface pressure measuring device and surface pressure measuring method |
| CN101307745A (en) * | 2007-05-14 | 2008-11-19 | 通用电气公司 | Rotor blades and method for reducing rotor blades noise |
| US8057183B1 (en) * | 2008-12-16 | 2011-11-15 | Florida Turbine Technologies, Inc. | Light weight and highly cooled turbine blade |
| CN104179642A (en) * | 2013-05-23 | 2014-12-03 | 西门子公司 | Airfoil trailing edge apparatus fo noise reduction |
-
2015
- 2015-12-23 CN CN201510976933.9A patent/CN105508150B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006299818A (en) * | 2005-04-15 | 2006-11-02 | Fuji Heavy Ind Ltd | Windmill blade, horizontal axis windmill, surface pressure measuring device and surface pressure measuring method |
| CN101307745A (en) * | 2007-05-14 | 2008-11-19 | 通用电气公司 | Rotor blades and method for reducing rotor blades noise |
| US8057183B1 (en) * | 2008-12-16 | 2011-11-15 | Florida Turbine Technologies, Inc. | Light weight and highly cooled turbine blade |
| CN104179642A (en) * | 2013-05-23 | 2014-12-03 | 西门子公司 | Airfoil trailing edge apparatus fo noise reduction |
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| CN105508150A (en) | 2016-04-20 |
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