CN105804955B - Blade for wind generating set and wind generating set - Google Patents
Blade for wind generating set and wind generating set Download PDFInfo
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- CN105804955B CN105804955B CN201610140112.6A CN201610140112A CN105804955B CN 105804955 B CN105804955 B CN 105804955B CN 201610140112 A CN201610140112 A CN 201610140112A CN 105804955 B CN105804955 B CN 105804955B
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- blade
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- noise
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- 238000002474 experimental method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
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- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009757 thermoplastic moulding Methods 0.000 description 1
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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
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
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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
Abstract
The invention provides a blade for a wind generating set and the wind generating set. The blade for the wind generating set comprises a blade front edge, a blade tail edge and a tail edge accessory, wherein the tail edge accessory is arranged on the tail edge of the blade and comprises a plurality of noise reduction teeth which are sequentially arranged along the tail edge of the blade and form a saw-toothed structure, a connecting line of the top point of each noise reduction tooth and the midpoint of the bottom edge is a bottom edge center line, and the included angle between the bottom edge center line of at least one noise reduction tooth and the tail edge of the blade at the position of the noise reduction tooth is smaller than 90 degrees. According to the invention, the plurality of saw-toothed noise reduction teeth are arranged on the blade tail edge of the blade for the wind generating set, and at least one noise reduction tooth is arranged in an inclined manner towards the blade tip direction of the blade, so that the aerodynamic noise generated by the blade of the wind generating set during rotation can be effectively reduced, and the problem that the noise exceeds the local noise standard during the operation of the fan blade is solved.
Description
Technical Field
The invention relates to a wind power technology, in particular to a blade for a wind generating set and the wind generating set.
Background
The wind turbine generator has been developed sufficiently in recent years due to its green and renewable characteristics. There is a growing recognition that low noise requires the incorporation of blade design systems to take full advantage of wind resources near cities and offshore regions. However, some wind turbines have a blade design which is not considered enough for noise, and the installation position of the wind turbine is close to a residential area, so that adverse effects are brought to normal life of residents, even some areas exceed the requirements of local noise standards, the legend project is terminated, and serious economic losses are brought to wind turbine manufacturers and owners.
The sawtooth is considered to reduce the aerodynamic noise of the blade to a certain extent, and wind tunnel experiments prove the result. The research result of the NLR (Netherlands aerospace national laboratory) on the positioning of the large wind turbine noise source shows that the radiation noise of the position (the spanwise direction is 80-95 percent and the non-pure blade tip) of the blade close to the blade tip is the largest; the blade is additionally provided with the sawtooth tail edge, so that 3.2dB can be reduced, and the feasibility of sawtooth noise reduction is actually verified from a wind field.
The prior patents mostly define the saw teeth to be axisymmetric along the local chord line direction of the blade, i.e. the saw teeth are in an isosceles triangle shape, or the single saw tooth is asymmetric but a plurality of saw teeth are alternately and periodically arranged, or the saw teeth are still in an isosceles triangle shape, but the bottom edge of the saw tooth is not parallel to the tail edge (1) with the connecting line of the blade. In the prior art, the sawteeth are designed aiming at an ideal condition, namely, under the condition that a streamline is zero or very small along a chord line direction or an included angle theta with the chord line direction, aerodynamic noise of blades can be effectively reduced, and the problem is also verified in two-dimensional airfoil experiments of acoustic wind tunnels; however, for the blades in actual operation, due to the existence of the included angle θ, the noise reduction effect is not optimal, and even under the condition that some included angles θ are larger, noise cannot be reduced, and even noise can be increased.
The defects of the prior art are that the actual airflow flowing condition of the outer side of the blade close to the blade tip is not considered, noise reduction measures are not considered, the actual condition of the operation of a wind turbine is separated, and the noise reduction capability of the sawteeth cannot be fully exerted.
Disclosure of Invention
The invention provides a blade for a wind generating set, which aims to solve the problem that the blade of the wind generating set in the prior art is high in noise.
In order to achieve the above object, an embodiment of the present invention provides a blade for a wind turbine generator system, which includes a leading edge of the blade and a trailing edge of the blade, and the blade further includes a trailing edge accessory disposed on the trailing edge of the blade, where the trailing edge accessory includes a plurality of noise reduction teeth disposed sequentially along the trailing edge of the blade and forming a saw-toothed structure, a connecting line between a vertex of each noise reduction tooth and a midpoint of a bottom edge is a bottom edge center line, and an included angle between the bottom edge center line of at least one noise reduction tooth and the trailing edge of the blade at the position of the noise reduction tooth.
Further, each noise reduction tooth is triangular in shape, and the larger one of the base angles of each noise reduction tooth is located on the side close to the tip of the blade.
Further, the angle of the apex angle of each noise reduction tooth is less than 45 °.
Further, a larger one of the base angles of each noise reduction tooth is greater than 80 degrees.
Further, the height of each noise reduction tooth is 5-25% of the chord length of the blade at the position of the noise reduction tooth.
Further, the width of each noise reduction tooth is 5-25% of the chord length of the blade at the position of the noise reduction tooth.
Further, the aspect ratio of each noise reduction tooth ranges from 1:2 to 5: 1.
Further, the aspect ratio values of the at least two noise reduction teeth are unequal.
Further, the at least two noise reduction teeth have different thicknesses.
Further, an included angle between two adjacent noise reduction teeth has a round structure.
Further, the trailing edge attachment is provided on a first section of the blade, the starting point of the first section being the tip apex, the length of the first section being at most three tenths of the length of the blade.
Embodiments of the present invention also provide a wind turbine generator system including a blade, which is a blade for a wind turbine generator system as in any one of the preceding.
The invention sets a plurality of saw-toothed noise reduction teeth on the blade tail edge of the blade for the wind generating set, the noise reduction teeth are all inclined towards the blade tip direction, meanwhile, the noise reduction teeth are set to be triangular, and the vertex angle of each noise reduction tooth is set to be less than 45 degrees, so that the aerodynamic noise generated by the blade of the wind generating set during rotation can be effectively reduced.
Drawings
FIG. 1 is a schematic structural view of a blade for a wind turbine generator system according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a noise reduction tooth in one embodiment of the present invention;
fig. 3 is a schematic structural view of a noise reduction tooth in another embodiment of the present invention.
Description of reference numerals:
1. a trailing edge of the blade; 2. a trailing edge attachment; 21. and noise reduction teeth.
Detailed Description
Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a blade for a wind generating set, the blade for a wind generating set includes a leading edge of the blade and a trailing edge 1 of the blade, the blade further includes a trailing edge accessory 2 disposed on the trailing edge 1 of the blade, the trailing edge accessory 2 includes a plurality of noise reduction teeth 21 sequentially disposed along the trailing edge 1 of the blade and forming a saw-toothed structure, a connecting line between a vertex of each noise reduction tooth 21 and a midpoint of a bottom edge is a bottom edge center line, and an included angle between the bottom edge center line of at least one noise reduction tooth 21 and the trailing edge 1 of the blade at the position of the bottom edge center line is.
According to the embodiment of the invention, the plurality of saw-toothed noise reduction teeth 21 are arranged on the blade tail edge 1 of the blade for the wind generating set, and at least one noise reduction tooth 21 is arranged to incline towards the blade tip or the blade root of the blade to conform to the airflow direction of the position of the blade, so that the aerodynamic noise generated by the blade during rotation is effectively reduced, and the problem that the aerodynamic noise does not meet the local noise standard requirement during the operation of the fan blade is solved.
Specifically, the trailing edge attachment 2 may be formed by machining equipment such as a wire cutting machine or a numerical control machine tool, which can precisely control the size and shape, or by a thermoplastic molding method. Further, the trailing edge attachment 2 may be made of any material, such as engineering plastic, fiberglass, or carbon fiber, etc. The trailing edge attachment 2 may be formed integrally with the blade; or can be formed separately and then connected with the suction surface or the pressure surface of the blade in a sticking and riveting mode, or connected with the blade in a tail edge slot mode. In the embodiment of the invention, the tail edge attachment 2 comprises a plurality of noise reduction teeth 21 which are sequentially arranged along the tail edge 1 of the blade and form a saw-toothed structure, so that the tail edge attachment 2 is arranged in the saw-toothed structure, because in a wind tunnel test, the saw teeth are proved to reduce the aerodynamic noise of the blade to a certain extent. The connecting line of the top point of each noise reduction tooth 21 and the bottom edge key point is a bottom edge center line, and the included angle between the bottom edge center line of at least one noise reduction tooth 21 and the blade tail edge 1 at the position is less than 90 degrees. That is, the apex angle of at least one noise reduction tooth 21 is biased toward the tip direction or the root direction of the blade.
In the prior art, the sawtooth structure arranged on the blade is mostly in a shape axially symmetrical along the chord direction of the blade, namely, the sawtooth structure is in an isosceles triangle shape, or a single sawtooth is asymmetrical but a plurality of sawteeth are alternately and periodically arranged, or the bottom edge of the sawtooth is not parallel to the tail edge of the blade connecting line, and the sawtooth structure is suitable for ideal conditions, namely the flow line of the airflow is in a condition that the included angle between the flow line of the airflow and the chord direction is small along the chord direction or the included angle between the flow line of the airflow and the. In the actual operation process of the wind driven generator, the airflow flowing direction near the tail edge 1 of each blade is not parallel to the chord length direction but forms a certain included angle, and even the included angle is larger in some blades, so that the saw tooth structure is arranged on the blades, the aerodynamic noise generated when the blades rotate cannot be reduced, and the noise is increased. Therefore, in order to solve the above problem, as shown in fig. 2, the noise reduction teeth 21 provided in the embodiment of the present invention have a triangular shape, and a part of the shape of the noise reduction teeth 21 may be an isosceles triangle, and the noise reduction teeth 21 of the isosceles triangle are located at a position where the airflow streamline of the blade trailing edge 1 is parallel to the chord direction or has a small included angle, or the noise reduction teeth 21 may not be all isosceles triangles, so that the base center line of each noise reduction tooth 21 is parallel or substantially parallel to the airflow streamline at the position thereof, so as to achieve a good noise reduction effect. The noise reduction teeth 21 may be obtuse triangular.
In the present embodiment, according to the observation of the rain wash trace of the blade of the wind turbine generator in actual operation, the larger one of the base angles of each noise reduction tooth 21 provided in the embodiment of the present invention is located on the side close to the blade tip of the blade. In other words, the shape of each noise reduction tooth 21 is not an isosceles triangle, and the apex angle of each noise reduction tooth 21 is offset in the blade tip direction of the blade. Thus, noise reduction can be achieved when the counter blade rotates, and the noise reduction capability of the noise reduction teeth 21 can be fully exhibited.
In other embodiments of the invention, as shown in fig. 3, the noise reduction teeth 21 forming the trailing edge attachment 2 may not be triangular, but may be configured to resemble a triangle, i.e. the noise reduction teeth 21 also have 3 corners, but the two oblique sides of the noise reduction teeth 21 are arranged in the form of a circular arc transition. The bending directions of the two oblique sides can be the same direction or opposite directions.
In an embodiment of the invention the angle of the top angle of each noise reduction tooth 21 is smaller than 45 deg. and as small as possible, while the larger one of the bottom angles of each noise reduction tooth 21, i.e. angle alpha in the figure, is larger than 80 deg., preferably the angle alpha is an obtuse angle. The reason why the apex angle of each noise reduction tooth 21 is set to be smaller than 45 ° is to ensure that the larger one of the base angles of the noise reduction teeth 21, which is not easy to realize due to the excessively large apex angle of the noise reduction teeth 21, is an obtuse angle. In addition, in general, the width and thickness of the blade of the wind turbine generator system will gradually decrease along the length direction from the blade root, and in order to satisfy the aerodynamic performance of the blade at different positions and ensure that the noise reduction teeth 21 can have the maximum noise reduction function at different positions, further, the larger angle among the bottom angles of the noise reduction teeth 21 is different from each other.
In order to avoid the influence of the overlarge arrangement of the noise reduction teeth 21 on the blade shape of the wind generating set and further influence on the aerodynamic performance of the blade of the wind generating set, in the embodiment of the invention, the height of each noise reduction tooth 21 is 5 to 25 percent of the chord length of the blade at the position of the noise reduction tooth, and similarly, the width of each noise reduction tooth 21 is 5 to 25 percent of the chord length of the blade at the position of the noise reduction tooth. This means that the noise reduction teeth 21 may all have equal aspect ratios, may not be equal, or may be partially equal. Preferably, the aspect ratio values of at least two of the noise reduction teeth 21 are different. More preferably, the noise reduction teeth 21 have different heights and widths, so that the noise reduction performance of the noise reduction teeth 21 located at different positions can be optimized. In addition, in some past wind tunnel tests, it was concluded that: the larger the ratio of the height to the width of the blade is, the better, but in the actual use process, it is found that the larger the ratio is, the better, and the conditions of local wind speed, blade shape of the blade and the like need to be comprehensively considered. Therefore, in the blade for the wind generating set provided by the embodiment of the invention, the height-to-width ratio of each noise reduction tooth 21 ranges from 1:2 to 5:1, and preferably ranges from 1:1 to 4: 1. As mentioned above, in order to satisfy the aerodynamic performance of different positions of the blade and ensure that the noise reduction teeth 21 can perform the maximum noise reduction function at different positions, the aspect ratios of the noise reduction teeth 21 are different. In addition, the thicknesses of at least two noise reduction teeth 21 are different, and preferably, the thicknesses of the noise reduction teeth 21 are not equal.
Further, in order to make the appearance of each noise reduction tooth 21 more beautiful and make the assembly easier, in the blade for the wind turbine generator system provided by the embodiment of the present invention, the included angle between two adjacent noise reduction teeth 21 and the vertex angle of each noise reduction tooth both have a rounded structure, and the rounded structure is also beneficial to noise reduction and can prevent noise caused by the air flow passing through the sharp corner.
In order to further increase the noise reduction effect, in a preferred embodiment of the invention the trailing edge attachment 2 is arranged on a first section of the blade, the starting point of which is the tip apex, the length of which is at most three tenths of the length of the blade. In other words, the length of the first segment may range from zero percent (none) to three tenths of the length of the vane in which it is located. Preferably, the length of the first section ranges from three percent to three tenths of the length of the vane on which the first section is located. In this way, the noise generated by the rotation of the blade can be effectively reduced by adding the tail edge accessory 2 at the position close to the blade tip.
The invention also provides a wind generating set, which comprises a blade, a fan, a tower and other structures, wherein the blade is the blade for the wind generating set. The blade for the wind generating set provided by the embodiment of the invention can effectively reduce the noise generated by the wind generating set during operation.
The blade for the wind generating set has the following effects:
the invention sets a plurality of saw-toothed noise reduction teeth on the blade tail edge of the blade for the wind generating set, the noise reduction teeth are all inclined towards the blade tip direction, meanwhile, the noise reduction teeth are set to be triangular, and the vertex angle of each noise reduction tooth is set to be less than 45 degrees, thereby effectively reducing the aerodynamic noise generated by the blade of the wind generating set during rotation. Moreover, the noise reduction tooth is simple in structure and convenient to process, and can be widely applied to various wind generating sets.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The blade for the wind generating set comprises a blade front edge and a blade tail edge (1), and is characterized by further comprising a tail edge accessory (2) arranged on the blade tail edge (1), wherein the tail edge accessory (2) comprises a plurality of noise reduction teeth (21) which are sequentially arranged along the blade tail edge (1) and form a saw-toothed structure, a connecting line of a vertex of each noise reduction tooth (21) and a midpoint of a bottom edge is a bottom edge central line, an included angle between the bottom edge central line of at least one noise reduction tooth (21) and the blade tail edge (1) at the position of the noise reduction tooth is smaller than 90 degrees,
wherein each noise reduction tooth (21) is substantially triangular in shape, and one of the base angles of each noise reduction tooth (21) is an obtuse angle, the base angle of each noise reduction tooth (21) which is an obtuse angle being located on the side close to the tip of the blade;
two bevel edges of each noise reduction tooth (21) are arranged in a circular arc transition mode, the bending directions of the two bevel edges are the same, and the bottom angles of the noise reduction teeth (21) which are obtuse angles are not equal.
2. A blade for a wind park according to claim 1, wherein the angle of the apex angle of each noise reducing tooth (21) is less than 45 °.
3. A blade for a wind park according to claim 1, wherein the height of each noise reducing tooth (21) is 5 to 25% of the chord length of the blade at the location thereof.
4. A blade for a wind park according to any of claims 1 to 3, wherein the width of each noise reducing tooth (21) is 5 to 25% of the chord length of the blade at its location.
5. Blade for a wind park according to claim 1, wherein the aspect ratio of each noise reducing tooth (21) ranges from 1:2 to 5: 1.
6. Blade for a wind park according to claim 5, wherein at least two of said noise reducing teeth (21) have different aspect ratios.
7. Blade for a wind park according to claim 1, wherein at least two of the noise reducing teeth (21) differ in thickness.
8. Blade for a wind park according to claim 1, wherein the angle between two adjacent noise reducing teeth (21) has a rounded configuration.
9. Blade for a wind park according to claim 1, wherein the trailing edge attachment (2) is arranged on a first section of the blade, the starting point of which is the tip apex, the length of which is at most three tenths of the blade length.
10. A wind park comprising a blade, wherein the blade is a blade for a wind park according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610140112.6A CN105804955B (en) | 2016-03-11 | 2016-03-11 | Blade for wind generating set and wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610140112.6A CN105804955B (en) | 2016-03-11 | 2016-03-11 | Blade for wind generating set and wind generating set |
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| Publication Number | Publication Date |
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| CN105804955A CN105804955A (en) | 2016-07-27 |
| CN105804955B true CN105804955B (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610140112.6A Active CN105804955B (en) | 2016-03-11 | 2016-03-11 | Blade for wind generating set and wind generating set |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107061192B (en) * | 2017-05-11 | 2019-04-23 | 南通兴东叶片科技有限公司 | A kind of low-noise high-efficiency wind blade |
| CN107489646B (en) * | 2017-08-02 | 2024-01-12 | 奥克斯空调股份有限公司 | Sawtooth type noise-reducing axial flow fan blade |
| CN108533450A (en) * | 2018-05-28 | 2018-09-14 | 浙江运达风电股份有限公司 | A kind of denoising device of wind power generating set blade |
| CN108953053B (en) * | 2018-07-16 | 2021-01-12 | 上海电气风电集团股份有限公司 | Wind power blade with comb-shaped sawtooth structure and mounting method thereof |
| CN113294286B (en) * | 2021-03-31 | 2023-02-03 | 江苏金风科技有限公司 | Blade noise reduction device, blade and wind generating set |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1338793A3 (en) * | 2002-02-22 | 2010-09-01 | Mitsubishi Heavy Industries, Ltd. | Serrated wind turbine blade trailing edge |
| US7976283B2 (en) * | 2010-11-10 | 2011-07-12 | General Electric Company | Noise reducer for rotor blade in wind turbine |
| US8523515B2 (en) * | 2010-11-15 | 2013-09-03 | General Electric Company | Noise reducer for rotor blade in wind turbine |
| JP2015529305A (en) * | 2012-09-24 | 2015-10-05 | シーメンス アクチエンゲゼルシヤフトＳｉｅｍｅｎｓ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ | Wind turbine blade |
| US9670901B2 (en) * | 2014-03-21 | 2017-06-06 | Siemens Aktiengesellschaft | Trailing edge modifications for wind turbine airfoil |
| CN204851544U (en) * | 2015-07-22 | 2015-12-09 | 代元军 | Apex trailing edge is wind turbine blades and wind energy conversion system of sawing dentate structure |
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