CN112211779A - Bionic wind driven generator blade based on biological characteristics - Google Patents
Bionic wind driven generator blade based on biological characteristics Download PDFInfo
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- CN112211779A CN112211779A CN202011212775.7A CN202011212775A CN112211779A CN 112211779 A CN112211779 A CN 112211779A CN 202011212775 A CN202011212775 A CN 202011212775A CN 112211779 A CN112211779 A CN 112211779A
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- driven generator
- wind driven
- bionic
- generator blade
- blade
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- 239000011664 nicotinic acid Substances 0.000 title claims abstract description 39
- 230000008878 coupling Effects 0.000 claims abstract 2
- 238000010168 coupling process Methods 0.000 claims abstract 2
- 238000005859 coupling reaction Methods 0.000 claims abstract 2
- 238000013461 design Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 235000001968 nicotinic acid Nutrition 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 210000003746 feather Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
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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 relates to a bionic wind driven generator blade based on biological characteristics. The wings of the birds with owl-shaped meshes and the section wing profile of the wings of the birds in flight can show good aerodynamics. Therefore, according to the bionics concept, the cross-sectional profiles at 50% of the wings of the owl and the non-smooth features of the front edges of the owl wings are extracted using technical means such as reverse engineering, curve fitting, etc. Firstly designing a bionic wing type wind driven generator blade by using a Wilson algorithm according to the extracted wing type, and then coupling the extracted non-smooth leading edge characteristic and the designed bionic wing type wind driven generator blade according to a similar theory to obtain the bionic wind driven generator blade. The designed bionic wind driven generator blade can obtain higher wind energy conversion efficiency under the large blade tip speed ratio, so that the generated energy is improved.
Description
Technical Field
The invention relates to the field of wind driven generator blade design and the field of bionic technology, in particular to a bionic wind driven generator blade based on biological characteristics.
Background
The appearance design of the blades of the wind driven generator plays a crucial role in the design and the work of the whole wind turbine, and the shape and the aerodynamics of the blades directly influence the wind energy conversion efficiency of the wind driven generator and influence the power generation capacity. The design of the wind driven generator blade is mostly guided by a momentum-phyllotaxis theory, and the wind energy conversion efficiency of the wind driven generator is improved by selecting wing sections with high lift-drag ratio and arranging the wing sections in the spanwise direction according to the pneumatic centers of the wing sections.
With the development of the technology, new research progresses on the design method of the wind driven generator blade. Many organisms have evolved to naturally select themselves during long-term growth to exhibit a number of advantages that are unique to themselves. Over millions of years of evolution, the wings of birds of the owl-shaped order form unique characteristics different from other birds, such as 'saw teeth' on the front edge of main flying feathers, 'Liuhai' on the rear edge of feathers, villi on the surfaces of wings, and the like. Therefore, the bionic wind driven generator blade based on biological characteristics is designed by extracting the non-smooth front edge structure of the owl wings and the section wing profiles of the owl wings by the technical personnel in the field, so that higher wind energy conversion efficiency is obtained, and the power generation capacity is improved.
Disclosure of Invention
In order to solve the technical problem, the invention provides a bionic wind driven generator blade based on biological characteristics, which is mainly characterized in that the wing section used by the wind driven generator blade is a bionic wing section, and the front edge of the wind driven generator blade is of a non-smooth structure.
The wing section used by the wind driven generator blade is a bionic wing section, and the wing section is extracted from the wing section of the owl. The wing profile extraction uses technical means such as three-dimensional reverse modeling and curve fitting. The extracted airfoil profile is used for designing a wind driven generator blade with a bionic airfoil profile by using a modified Wilson algorithm.
The non-smooth structure of the front edge of the wind turbine blade is extracted from the non-smooth characteristics of the front edge of the owl wings. The extracted non-smooth features are curves driven by approximate sine functions, and the wavelength and the amplitude of the curves are determined according to the section chord length of the wings. According to a similar theory, the extracted non-smooth front edge and the designed bionic wing type wind driven generator blade are coupled and designed, and therefore the bionic wing type wind driven generator blade is designed.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a result graph of extraction of 50% section wing profiles of owl wings.
FIG. 3 is a diagram of an airfoil coupled non-smooth leading edge aerogenerator blade in accordance with the present invention.
FIG. 4 is a power coefficient comparison diagram of a bionic wind power generator blade and a standard wind power generator blade under the same wind speed condition.
In the figure, L is the blade length, C1Maximum chord length, C2Minimum chord length, A-amplitude, B-wavelength.
Detailed Description
The invention is further described below with reference to the accompanying drawings. According to the patent requirements, the invention discloses a bionic wind driven generator blade based on biological characteristics as shown in figure 1. The specific implementation mode of the invention adopts the technical scheme that: the wing profile used by the wind driven generator blade is extracted from the wing profile with 50 percent of section of the owl, and the non-smooth structure of the front edge of the wind driven generator blade is designed to the front edge of the wind driven generator blade according to the characteristics of the non-smooth front edge of the owl wing and according to a similar theory.
In this embodiment, the specific shape of the airfoil is shown in fig. 2. The extraction of the wing profile is obtained by selecting 50% sections of the wing model from the three-dimensional model of the owl wings through curve fitting. The chord length C of the extracted airfoil is 100mm, the maximum thickness of the airfoil is 10.98mm, and the position of 10.28 percent of the chord length is positioned; the maximum curvature was 7.49mm at the 37.6% position of the chord length.
Firstly designing a bionic wing type wind driven generator blade by the extracted wing type through an improved Wilson algorithm, wherein the length L of the bionic wing type wind driven generator blade is 1333mm, and the maximum chord length C of the blade is1Is 279.3mm with the smallest chord length C2Is 56.9 mm.
In the embodiment, the ratio of the height of the front edge bulge to the distance between the central lines of the bulges is 0.12-0.19 by extracting the front edge characteristics of the three-dimensional model of the wings of the owl. And the structure of the non-smooth front edge of the airfoil is in direct proportion to the chord length in a certain range, and the main characteristic of the non-smooth front edge structure is determined to be the wavelength and the amplitude, so that the non-smooth front edge is set to be a continuous sine curve, and the wavelength and the amplitude of the sine curve are in direct proportion to the chord length of the airfoil of the wind driven generator blade.
The torsion angle and the chord length of the bionic wing type wind driven generator blade are changed along the spanwise direction, so that the wavelength and the amplitude of the bionic non-smooth front edge are changed along with the chord length of the blade, but the change range is consistent with the change range of the extracted non-smooth front edge. According to the theory of designing the blades of the wind turbine blades, the designed blades of the bionic wing type wind driven generator are divided into 10 parts, the average chord length of the front chord and the average chord length of the rear chord of the section are taken as the chord length of each part, and the curve of the front edge of each part is an equation driven by a sine function. The three-dimensional model of the bionic wind driven generator blade obtained by the method is shown in fig. 3, and the design data of the bionic wind driven generator blade is shown in table 1.
TABLE 1
FIG. 4 is a power coefficient comparison diagram of a bionic wind power generator blade and a standard wind power generator blade under the same wind speed condition. The higher the power system of the wind power generator indicates that the wind power generator has higher efficiency of converting wind energy and generates higher power in the same time. And comparing the power coefficients of the standard type wind driven generator blade and the bionic wind driven generator blade by changing the tip speed ratio under the rated wind speed (5 m/s). The power coefficient obtained from the graph shows the trend of increasing firstly and then decreasing along with the increase of the tip speed ratio, but the power coefficient of the bionic wind driven generator blade is not obviously increased relative to the power coefficient of the standard wind driven generator blade under the low tip speed ratio (TSR = 1-4), and the power coefficient of the bionic wind driven generator blade is improved by 17.7% compared with the power coefficient of the standard wind driven generator blade under the high tip speed ratio (TSR = 4-7).
The bionic wind driven generator blade can obtain higher wind energy conversion efficiency under the same wind speed condition, and further improve the generated energy.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.
Claims (5)
1. A bionic wind driven generator blade based on biological characteristics mainly comprises a bionic wing section used by the wind driven generator blade and a non-smooth structure at the front edge of the wind driven generator blade.
2. The bionic wind driven generator blade based on biological characteristics according to claim 1, wherein: the used wing profile is a bionic wing profile, the wing profile is obtained by extracting 50% section wing profile of the owl wing and fitting, when the chord length of the finally obtained wing profile is 100mm, the maximum thickness of the wing profile is 10.83mm, and the maximum thickness is 9% of the chord length; the maximum curvature was 7.49mm at the 37.6% position of the chord length.
3. The bionic wind driven generator blade based on biological characteristics according to claim 1, wherein: the front edge of the wind turbine blade is a non-smooth structure which is designed to the front edge of the wind turbine blade according to a similar theory according to the characteristics of the non-smooth front edge of the owl wings, and the non-smooth front edge structure is a sine curve determined by the amplitude and the wavelength.
4. The bionic wind driven generator blade based on biological characteristics as claimed in claims 2-3, wherein: the wind driven generator blade is a bionic wind driven generator blade formed by coupling design of wing profile and non-smooth leading edge characteristics, the length L of the bionic wing profile wind driven generator blade is 1333mm, and the maximum chord length C of the blade is1Is 279.3mm with the smallest chord length C2Is 56.9 mm.
5. The basic parameters of the bionic wind driven generator blade meet the following requirements:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011212775.7A CN112211779A (en) | 2020-11-03 | 2020-11-03 | Bionic wind driven generator blade based on biological characteristics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011212775.7A CN112211779A (en) | 2020-11-03 | 2020-11-03 | Bionic wind driven generator blade based on biological characteristics |
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| CN112211779A true CN112211779A (en) | 2021-01-12 |
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| CN202011212775.7A Pending CN112211779A (en) | 2020-11-03 | 2020-11-03 | Bionic wind driven generator blade based on biological characteristics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007009A (en) * | 2021-03-16 | 2021-06-22 | 中国科学院工程热物理研究所 | Tip winglet of wind turbine blade and preparation method thereof |
| CN113323796A (en) * | 2021-06-29 | 2021-08-31 | 中国科学院工程热物理研究所 | Bionic leading edge wind power blade and optimal design method |
-
2020
- 2020-11-03 CN CN202011212775.7A patent/CN112211779A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007009A (en) * | 2021-03-16 | 2021-06-22 | 中国科学院工程热物理研究所 | Tip winglet of wind turbine blade and preparation method thereof |
| CN113323796A (en) * | 2021-06-29 | 2021-08-31 | 中国科学院工程热物理研究所 | Bionic leading edge wind power blade and optimal design method |
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