CN209855956U - Wind power blade and wind turbine generator system - Google Patents
Wind power blade and wind turbine generator system Download PDFInfo
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- CN209855956U CN209855956U CN201920839631.0U CN201920839631U CN209855956U CN 209855956 U CN209855956 U CN 209855956U CN 201920839631 U CN201920839631 U CN 201920839631U CN 209855956 U CN209855956 U CN 209855956U
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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 utility model provides a wind-powered electricity generation blade and wind turbine generator system relates to wind power generation technical field. The wind power blade is provided with a first section, a second section, a third section and a fourth section at intervals in the spanwise direction by taking a blade root as a starting point, the first section, the second section, the third section and the fourth section are standard airfoil sections of the same series of wind turbines, blade airfoils between the blade root and the first section, between the first section and the second section, between the second section and the third section and between the third section and the fourth section are obtained by linear interpolation of adjacent standard airfoil sections, and the fourth section is positioned at 98% -100% of the spanwise position. The wind turbine generator comprises the wind turbine blade. The wind power blade is high in geometric compatibility, good in pneumatic performance and high in blade rigidity.
Description
Technical Field
The utility model relates to a wind power generation technical field particularly, relates to a wind-powered electricity generation blade and wind turbine generator system.
Background
The aerodynamic performance of wind blades of wind power generation systems is very important. At present, multi-megawatt wind power blades are generally in the form of combined airfoils of Du series standard airfoils and American NACA6 series laminar flow airfoils in the Netherlands. Among them, the Du series airfoil in the Netherlands was developed by the university of Fuctness in the Netherlands, and the American aviation NACA6 series laminar airfoil was developed by the American national aviation advisory Committee (abbreviated as NACA, now NASA). The multi-megawatt wind-power blade in the form of the combined airfoil has poor geometric compatibility, poor aerodynamic performance in a turbulent environment and low blade rigidity.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a wind-powered electricity generation blade and wind turbine generator system, its geometric compatibility is higher, and pneumatic performance is good, and blade rigidity is higher.
The embodiment of the utility model is realized like this:
a wind power blade is provided with a first section, a second section, a third section and a fourth section at intervals in the spanwise direction by taking a blade root as a starting point, wherein the first section, the second section, the third section and the fourth section are standard airfoil sections of a same series of wind turbines, blade airfoils between the blade root and the first section, between the first section and the second section, between the second section and the third section and between the third section and the fourth section are obtained by linear interpolation of adjacent standard airfoil sections, and the fourth section is positioned at 98% -100% of the spanwise position.
Further, the first section is a standard airfoil section with a relative thickness of 60%, the second section is a standard airfoil section with a relative thickness of 40%, the third section is a standard airfoil section with a relative thickness of 25%, and the fourth section is a standard airfoil section with a relative thickness of 21%.
Further, the first section is located at 10% -15% of the spanwise direction, the second section is located at 20% -24% of the spanwise direction, and the third section is located at 68% -75% of the spanwise direction.
Further, the first section is a standard blunt-trailing-edge airfoil section with a relative thickness of 60%.
Further, the blunt trailing edge has a relative thickness of 10% to 18%.
Further, the wind power blade is provided with a standard airfoil section with the relative thickness of 30% between the second section and the third section.
Further, the wind power blade is provided with a standard airfoil section with a relative thickness of 35% between the second section and the standard airfoil section with a relative thickness of 30%.
Further, the relative thickness of the airfoil profile of the wind power blade decreases progressively from the blade root to the fourth section in the spanwise direction.
Further, the relative thickness between the fourth cross-section and the blade tip is greater than or equal to 21%.
A wind turbine generator comprises the wind turbine blade.
The utility model discloses beneficial effect includes:
the wind power blade is provided with a first section, a second section, a third section and a fourth section at intervals in the spanwise direction by taking a blade root as a starting point, the first section, the second section, the third section and the fourth section are standard airfoil sections of the same series of wind turbines, blade airfoils between the blade root and the first section, between the first section and the second section, between the second section and the third section and between the third section and the fourth section are obtained by linear interpolation of adjacent standard airfoil sections, and the fourth section is positioned at 98% -100% of the spanwise position. The wind power blade is characterized in that the first section, the second section, the third section and the fourth section are set to be standard airfoil sections of the same series of wind turbines, and the blade airfoils of each section of the blade between the sections are obtained by linear interpolation of the adjacent standard airfoil sections, namely, the whole blade adopts the airfoil section of the wind turbine in the spanwise direction, so that the combined form of the airfoil section of the wind turbine and the aeronautical airfoil section is avoided, special treatment on the connecting positions of the sections of the blade is not needed to coordinate the transition of aerodynamic performance and geometric structure, the geometric compatibility of the whole blade is improved, and the three-dimensional complex flow of the transition positions between the airfoil sections of different types is prevented. Meanwhile, compared with a standard wing section of a wind turbine, the aviation laminar flow wing section has poor pneumatic performance and small thickness in a turbulent flow environment, and the wind turbine type wing section is integrally adopted for the wind turbine type wind turbine blade, so that the pneumatic performance and the rigidity of the blade can be effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a first viewing angle of a wind power blade in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second viewing angle of the wind power blade in the embodiment of the present invention;
FIG. 3 is a schematic structural view of a blade root cross-section according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first cross section in an embodiment of the present invention;
fig. 5 is a schematic structural view of a second cross section in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a standard airfoil section with a relative thickness of 35% according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a standard airfoil section with a relative thickness of 30% according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a third cross section in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a fourth cross section in the embodiment of the present invention.
Icon: 100-wind power blades; 110-a first cross-section; 112-a blade root; 120-leaf root segment; 122-a transition section; 130-a second cross section; 140-a middle section; 142-standard airfoil section with 35% relative thickness; 144-standard aerofoil section with relative thickness of 30%; 150-third cross section; 152-blade tip; 160-tip section; 170-fourth cross section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are used only for layer-distinguishing description, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and fig. 2, the present embodiment provides a wind turbine blade 100, which has a first cross section 110, a second cross section 130, a third cross section 150, and a fourth cross section 170 spaced apart from each other in a spanwise direction a from a blade root 112. The first section 110, the second section 130, the third section 150 and the fourth section 170 are standard airfoil sections of the same series of wind turbines. The blade airfoil between the blade root 112 and the first section 110, between the first section 110 and the second section 130, between the second section 130 and the third section 150, and between the third section 150 and the fourth section 170 are obtained by linear interpolation of adjacent standard airfoil sections. Meanwhile, the fourth section 170 is located at 98% -100% of the spanwise direction a, so that the blade airfoils of the whole wind power blade 100 are the same type of airfoil.
The standard airfoil profile of the wind turbine refers to airfoil profiles with different aerodynamic performances which are specially designed according to the operation and inflow conditions of the wind turbine. The standard airfoil profile of the wind turbine comprises DU series in the Netherlands, FFA series in Sweden, RISO series in Denmark and NPU-WA/NPU-MWA series developed by northwest industry university in China. In the present embodiment, the first section 110, the second section 130, the third section 150 and the fourth section 170 are standard airfoils of a DU series wind turbine. In other embodiments, the first, second, third and fourth sections 110, 130, 150 and 170 may also be in the NPU-WA/NPU-MWA family, as long as the first, second, third and fourth sections 110, 130, 150 and 170 all belong to the same family of wind turbine standard airfoils. In addition, the airfoil profile obtained by linear interpolation belongs to a non-standard airfoil profile, and is not specially developed, and the operating environment and characteristics of the blade section where the non-standard airfoil profile is located are not fully considered.
The spanwise direction a is the direction parallel to the longitudinal axis of the blade. The relative thickness of the airfoil of the wind turbine blade 100 decreases in the spanwise direction a from the blade root 112 to the fourth cross section 170. The relative thickness of the airfoil refers to the ratio of the maximum thickness of the airfoil section to the chord length of the section.
Specifically, the first cross section 110 is a standard airfoil cross section with a relative thickness of 60%, and the first cross section 110 is located 10% to 15% of the spanwise direction a, that is, the root 112 is taken as the starting point of the spanwise direction a of the blade, and the ratio of the distance between the first cross section 110 and the root 112 in the spanwise direction a to the total length of the blade is 10% to 15%. The second section 130 is a standard airfoil section with a relative thickness of 40%, and the second section 130 is located at 20% -24% of the spanwise direction, that is, the root 112 is taken as the starting point of the spanwise direction of the blade, and the ratio of the distance between the second section 130 and the root 112 to the total length of the blade in the spanwise direction a is 20% -24%. The third section 150 is a standard aerofoil section with a relative thickness of 25%, and the third section 150 is located at 68% -75% of the spanwise direction, i.e. the ratio of the distance of the third section 150 from the blade root 112 to the total length of the blade in the spanwise direction a is 68% -75%. The fourth section 170 is a standard airfoil section with a relative thickness of 21% and is located 98% -100% of the spanwise direction a, i.e. the ratio of the distance between the fourth section 170 and the blade root 112 to the total length of the blade in the spanwise direction a is 98% -100%.
For convenience, a root section 120 is located between the root 112 and the first cross-section 110, a transition section 122 is located between the first cross-section 110 and the second cross-section 130, an intermediate section 140 is located between the second cross-section 130 and the third cross-section 150, and a tip section 160 is located between the third cross-section 150 and the fourth cross-section 170. The blade airfoil shapes between the blade root 112 and the first section 110, between the first section 110 and the second section 130, between the second section 130 and the third section 150, and between the third section 150 and the fourth section 170 are all obtained by linear interpolation of adjacent standard airfoil sections. That is, the blade profiles of the root section 120, the transition section 122, the intermediate section 140 and the tip section 160 are all the same series of wind turbine profile sections.
Generally, the section of the wind blade root 112 of the multi-megawatt wind turbine generator set is circular, the length of the wind blade 100 is large, and the length of the blade between the blade root 112 and a standard airfoil profile with a relative thickness of 40% (i.e., the blade root section 120+ the transition section 122) accounts for more than 20% of the total length of the blade. In the prior art, the middle transitional airfoil section of the blade is directly obtained by interpolation of the circular section of the blade root 112 and the standard airfoil section with the relative thickness of 40%, and the blade has poor aerodynamic performance and small section rigidity. Referring to fig. 3, 4 and 5, in order to fully utilize the blade from the blade root 112 to the standard airfoil with a relative thickness of 40%, so as to have good aerodynamic performance and reduce the performance limit of the section on the wind turbine blade 100, a standard airfoil section with a relative thickness of 60% is provided at the section, so as to separate the blade root section 120 and the transition section 122. The blade root section 120 mainly plays a role in connection, and the transition section 122 completely has aerodynamic characteristics of the wind turbine, so that aerodynamic performance is improved. In this embodiment, the first cross section 110 is a standard blunt trailing edge airfoil cross section 122 with a relative thickness of 60%, and the trailing edge portion thereof adopts a vertical surface, so that the transition section 122 has a vertical surface type blunt trailing edge, which can increase the cross section of the blade while ensuring that the aerodynamic performance is not reduced, and improve the rigidity of the transition section 122, thereby improving the rigidity of the blade. In this embodiment, the blunt trailing edge has a relative thickness of 10% to 18%. The root 112 is circular in cross-section and the relative thickness of the blade airfoil between the root 112 and the first cross-section 110 is interpolated linearly. The relative thickness of the blade airfoil between the first section 110 and the second section 130 is derived from linear interpolation. The trailing edge thicknesses of the first section 110 and the second section 130 are calculated according to the thickness of the trailing edge of a standard airfoil, the trailing edge thickness of the root segment 120 is gradually reduced from the root 112 to the first section 110, and the trailing edge thickness of the transition segment 122 is gradually reduced from the first section 110 to the second section 130. The trailing edge thickness can be adjusted to the actual situation to balance aerodynamic and structural performance.
Referring to fig. 6, 7 and 8, the wind turbine blade 100 is provided with a standard airfoil section 144 with a relative thickness of 30% between the second section 130 and the third section 150, and the airfoils between the second section 130 and the standard airfoil section 144 with the relative thickness of 30%, between the standard airfoil section 144 with the relative thickness of 30% and between the third section 150 are obtained by linear interpolation of adjacent standard airfoils. In the embodiment, the wind turbine blade 100 is further provided with a standard airfoil section 142 with a relative thickness of 35% between the second section 130 and the standard airfoil section 144 with a relative thickness of 30%, and the airfoils between the second section 130 and the standard airfoil section 142 with a relative thickness of 35% and between the standard airfoil section 142 with a relative thickness of 35% and the standard airfoil section 144 with a relative thickness of 30% are respectively obtained by linear interpolation of adjacent standard airfoils, so as to further optimize aerodynamic performance. That is, the intermediate section 140 has a standard aerofoil section 142 of 35% relative thickness and a standard aerofoil section 144 of 30% relative thickness spaced apart in the spanwise direction a. In other embodiments, the intermediate section 140 may be provided with only a standard airfoil section 144 having a relative thickness of 30%. The spanwise positions of the standard airfoil section 142 with the relative thickness of 35% and the standard airfoil section 144 with the relative thickness of 30% are determined according to an optimal design theory so as to ensure that the aerodynamic performance of the whole blade is excellent.
Referring to fig. 8 and 9, the tip section 160 is located between the third section 150 and the fourth section 170. The third section 150 is a standard aerofoil section with a relative thickness of 25% and the fourth section 170 is a standard aerofoil section with a relative thickness of 21%. The airfoil profile and the relative thickness between the third section 150 and the fourth section 170 are obtained by linear interpolation, so that the blade tip section 160 is similar to the middle section 140, the blade root section 120 and the transition section 122, and the same series of wind turbine airfoil profiles are adopted, thereby avoiding using aviation laminar flow airfoil profiles at the blade tip section 160, avoiding special attention and processing on the aerodynamic compatibility and geometric compatibility at the joint of the combined structure, having simple structure, and simultaneously reducing the influence of performance reduction of the aviation laminar flow airfoil profiles on the wind power blade 100 in a turbulent flow environment.
In addition, the blade between the fourth section 170 and the blade tip 152 occupies 2% of the total length of the blade in the spanwise direction a, and the section is a part needing to be ground in actual production, so that the purpose of ensuring the pneumatic performance of the most tip part of the blade and simultaneously properly increasing the thickness of the trailing edge is convenient for production and manufacturing. The relative thickness of the very tip of the blade is not less than the relative thickness of the fourth section 170, i.e., the relative thickness between the fourth section 170 and the tip 152 is 21% or greater. Therefore, the minimum relative thickness of the wind power blade 100 is 21%, and compared with a common multi-megawatt wind power blade, the minimum relative thickness of the wind power blade 100 is larger, so that the rigidity and the strength of the blade tip 152 and the blade tip section 160 can be effectively improved, pre-bending can be reduced, and transportation is facilitated.
In addition, a three-dimensional shape is established according to the geometrical compatibility analysis result of the airfoil cluster and the chord length, the torsion angle and the relative thickness distribution determined by the blade aerodynamic design technology, and the chord direction distribution position of the airfoil is adjusted under the condition of ensuring the smooth transition of the front and tail edge connecting lines of each section, so that the maximum thickness position of the airfoil of each section is close to the axis of the blade as much as possible. The thickness of the airfoil profile and the tail edge of other sections is obtained by interpolation according to the adjacent standard airfoil profiles.
The working principle of the wind turbine blade 100 is as follows:
first, the first section 110, the second section 130, the third section 150 and the fourth section 170 are all standard airfoil sections of the same series of wind turbines. The blade airfoil between the blade root 112 and the first section 110, between the first section 110 and the second section 130, between the second section 130 and the third section 150, and between the third section 150 and the fourth section 170 are obtained by linear interpolation of adjacent standard airfoil sections. Meanwhile, the fourth section 170 is located at 98% -100% of the span-wise direction a, so that the blade airfoils of the whole wind power blade 100 from the blade root section 120, the transition section 122, the middle section 140 and the blade tip section 160 are all of the same type. The geometric compatibility is better, and good pneumatic performance can be maintained under the turbulent flow environment.
Second, the first section 110 is a standard blunt trailing edge airfoil section with a relative thickness of 60%, located between 10% and 15% of the spanwise direction a, dividing the root 112 to a standard airfoil with a relative thickness of 40% into a root section 120 and a transition section 122. The relative thickness of the blade airfoil between the root 112 and the first cross-section 110 is derived by linear interpolation. The relative thickness of the blade airfoil between the first section 110 and the second section 130 is obtained by linear interpolation, and is the airfoil section of the wind turbine. The blade root section 120 mainly plays a role in connection, and the transition section completely has the aerodynamic characteristics of the wind turbine and the appearance of a vertical surface structure, so that the aerodynamic performance and the structural rigidity are greatly improved.
Finally, the blade airfoil profile in the middle of the blade tip section 160 between the third section 150 and the fourth section 170 is determined by interpolation of adjacent standard airfoil profile sections, and the third section 150 and the fourth section 170 are both wind turbine standard airfoil profile sections, so that the whole section of the blade tip section 160 is a wind turbine airfoil profile and is of the same type of airfoil profile structure as the middle section 140, without special attention and treatment on the pneumatic compatibility and the geometric compatibility of the joint of the combined structure, the structure is simple, and meanwhile, the influence of performance reduction of the aviation laminar flow airfoil profile on the wind turbine blade 100 in a turbulent environment is reduced. The minimum relative thickness of the tip section 160 and the tip portion of the blade between the fourth cross section 170 and the blade tip 152 is 21%, which effectively improves the rigidity of the blade, reduces pre-bending, and facilitates transportation.
The wind turbine blade 100 prevents three-dimensional complex flow at transition positions between different types of airfoils by enabling the whole blade to adopt the airfoil section of a wind turbine, and has good geometric compatibility and good pneumatic performance. The relative thickness of the whole blade is not less than 21%, and the rigidity of the blade is effectively improved.
The present embodiment also provides a wind turbine, which includes a wind turbine blade 100. The wind power blade 100 has good pneumatic performance, and is beneficial to improving the efficiency of a wind turbine generator.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The wind power blade is characterized in that a first section, a second section, a third section and a fourth section are arranged at intervals in the spanwise direction from a blade root as a starting point, the first section, the second section, the third section and the fourth section are standard airfoil sections of a same series of wind turbines, blade airfoils between the blade root and the first section, between the first section and the second section, between the second section and the third section and between the third section and the fourth section are obtained by linear interpolation of adjacent standard airfoil sections, and the fourth section is positioned at 98% -100% of the spanwise position.
2. The wind blade as set forth in claim 1, wherein the first section is a standard airfoil section with a relative thickness of 60%, the second section is a standard airfoil section with a relative thickness of 40%, the third section is a standard airfoil section with a relative thickness of 25%, and the fourth section is a standard airfoil section with a relative thickness of 21%.
3. The wind blade as set forth in claim 1 wherein said first cross-section is located at 10% -15% of said spanwise direction, said second cross-section is located at 20% -24% of said spanwise direction, and said third cross-section is located at 68% -75% of said spanwise direction.
4. The wind blade as set forth in claim 1 wherein said first cross-section is a standard blunt trailing edge airfoil cross-section having a relative thickness of 60%.
5. The wind blade as set forth in claim 4 wherein the blunt trailing edge has a relative thickness of 10% to 18%.
6. Wind blade according to claim 1, characterised in that it is provided with a standard aerofoil section with a relative thickness of 30% between the second section and the third section.
7. Wind blade according to claim 6, characterized in that it is provided with a standard aerofoil section with a relative thickness of 35% between the second section and the standard aerofoil section with a relative thickness of 30%.
8. The wind blade as set forth in claim 1 wherein the airfoil of the wind blade has a relative thickness that decreases in the spanwise direction from the blade root to the fourth cross-section.
9. The wind blade of claim 1 wherein the relative thickness between the fourth cross section and the blade tip is greater than or equal to 21%.
10. Wind turbine comprising a wind turbine blade according to any of claims 1 to 9.
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| CN201920839631.0U CN209855956U (en) | 2019-06-04 | 2019-06-04 | Wind power blade and wind turbine generator system |
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| CN201920839631.0U CN209855956U (en) | 2019-06-04 | 2019-06-04 | Wind power blade and wind turbine generator system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080938A (en) * | 2019-06-04 | 2019-08-02 | 三一重能有限公司 | A kind of wind electricity blade and Wind turbines |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080938A (en) * | 2019-06-04 | 2019-08-02 | 三一重能有限公司 | A kind of wind electricity blade and Wind turbines |
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Address after: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee after: Sany Heavy Energy Co., Ltd Address before: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee before: SANY HEAVY ENERGY Co.,Ltd. |
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