CN106065847B - Variable cross-section wind power blade - Google Patents
Variable cross-section wind power blade Download PDFInfo
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- CN106065847B CN106065847B CN201610653490.4A CN201610653490A CN106065847B CN 106065847 B CN106065847 B CN 106065847B CN 201610653490 A CN201610653490 A CN 201610653490A CN 106065847 B CN106065847 B CN 106065847B
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- blade
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- movable blade
- tip
- blades
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- 230000005611 electricity Effects 0.000 claims abstract description 3
- 238000010030 laminating Methods 0.000 abstract 3
- 238000000034 method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 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
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
- F03D1/0641—Rotors characterised by their aerodynamic shape of the blades of the section profile of the blades, i.e. aerofoil profile
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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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Wind Motors (AREA)
Abstract
The utility model provides a novel wind-powered electricity generation blade of variable cross section, includes blade main part and beta structure, its characterized in that: but beta structure is located blade main part both sides to be divided into 6 parts, but each partial beta structure includes two rotating vane, pivot and pointed end, the pointed end is fixed in the blade main part, two rotating vane can rotate to laminating with the blade main part or with the pointed end laminating around pivot separately in step, and when laminating with the pointed end, the rotating vane pointed end constitutes stable triangle-shaped structure. The unique blade structure with the tip can form a stable triangular stress structure when the movable blade is closed, and reduces the windward resistance. When the movable blade is opened, the movable blade is attached to the blade main body, a stable structure is formed, and the large change of the windward resistance is not caused. The invention can flexibly adjust the structure of the blade and change the swept area of the blade by controlling the rotation of the movable blade.
Description
Technical Field
The invention relates to the field of wind power blades, in particular to a novel wind power blade with a variable cross section.
Background
Wind energy is a clean renewable energy source and has great application potential. The principle of wind power generation is that the rotation of a wind power blade is utilized to drive a generator to generate power, and the formula of the output power of the wind power generator is as follows:
in the formula:
p: the output power of the wind driven generator;
C p : a wind energy utilization factor;
ρ: the density of the air;
a: a blade swept area;
v: wind speed.
According to the above formula, the output power of the wind power generator is proportional to the swept area of the blade. The wind energy has the characteristics of random change of wind power and wind direction, so that the daily change, seasonal change and even annual change of the wind are very obvious, fluctuation is large and the wind is very unstable. How to make wind power blades better adapt to wind fluctuation is a problem existing in the field of wind power generation.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a novel wind power blade with a variable cross section, which has a unique blade structure with a tip end, reduces the resistance of air flowing through the blade, and can flexibly change the swept area of the blade according to the wind speed through the rotation of movable blades on two sides of the blade so as to better capture wind energy.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a novel wind-powered electricity generation blade of variable cross section, includes blade main part 7 and beta structure, its characterized in that: the foldable structure is located on two sides of the blade body 7 and is divided into 6 parts, each part of the foldable structure comprises a rotating blade a8, a rotating blade b12, a rotating shaft a9, a rotating shaft b11 and a tip a10, the tip a10 is fixed on the blade body 7, the rotating blade a8 and the rotating blade b12 can synchronously rotate around the rotating shaft a9 and the rotating shaft b11 respectively to be attached to the blade body 7 or the tip a10, and when the rotating blade b12, the rotating blade a8 and the tip a10 are attached to the tip a10, the rotating blade b12, the rotating blade a8 and the tip a10 form a stable triangular structure.
The cross sections of the rotating blades a8 and the rotating blades b12 are isosceles triangles with base angles of 15 degrees, the cross section of the tip a10 is an equilateral triangle, and the sides of the isosceles triangles are equal to the side length of the equilateral triangle.
The foldable structures located on two sides of the blade body 7 are divided into a movable blade a1, a movable blade b2, a movable blade c3, a movable blade d4, a movable blade e5 and a movable blade f6,6 parts, and the lengths of the parts are respectively marked as L1, L2, L3, L4, L5 and L6, so that the foldable structure has a length of L1: l3: l5=5:4:3, L2: l4: l6=5:4:3.
the rotation of the movable blades a1, b2, c3, d4, e5 and f6 is independent, when the wind speed is increased, the movable blades on two sides are opened in sequence, and when the wind speed is decreased, the movable blades on two sides are closed in sequence.
Compared with the prior art, the invention has the following advantages:
1. according to the novel wind power blade with the variable cross section, a stable triangular stress structure can be formed by the unique blade structure with the tip when the movable blade is closed, the rigidity of the blade is enhanced, and the windward resistance is reduced. When the movable blade is opened, the movable blade is attached to the blade main body, a stable structure is formed, and the large change of the windward resistance is not caused. The invention can change the shape of the blade section and simultaneously change the integral swept area of the blade by controlling the opening and closing of the movable blade.
2. The novel foldable structure of the variable-section wind power blade is positioned on two sides of a blade main body 7 and is divided into 6 parts along the length direction of the blade, each part can rotate independently, the movable blade is opened and closed in sequence according to the change of wind speed, the structure and the swept area of the blade can be adjusted, the variable-section wind power blade adapts to the change of the wind speed and the wind direction in a larger range, and the reliability and the adjustment flexibility of the blade structure are both considered.
Drawings
Fig. 1a is a schematic view of 6 moving blades all closed.
Fig. 1b is a schematic view of the movable blades a1 and b2 being opened, and the remaining blades being closed.
Fig. 1c is a schematic view of the movable blades a1, b2, c3, d4 being opened and the movable blades e5 and f6 being closed.
Fig. 1d is a schematic view of 6 movable vanes all open.
Fig. 1e is a schematic view of the movable blades a1, c3, and e5 being opened, and the movable blades b2, d4, and f6 being closed.
Fig. 1f is a schematic view of the closed movable blades a1, c3, and e5, and the closed movable blades b2, d4, and f 6.
FIG. 2base:Sub>A isbase:Sub>A cross-sectional view A-A of FIG. 1base:Sub>A.
FIG. 2B is a cross-sectional view B-B of FIG. 1 d.
FIG. 2C is a cross-sectional view C-C of FIG. 1 e.
FIG. 2D is a cross-sectional view taken along line D-D of FIG. 1 f.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1a, the novel wind power blade with a variable cross section comprises a blade body 7 and foldable structures, wherein the foldable structures are positioned on two sides of the blade body 7 and are divided into 6 parts.
As a preferred embodiment of the present invention, the foldable structure is divided into a movable leaf a1, a movable leaf b2, a movable leaf c3, a movable leaf d4, a movable leaf e5 and a movable leaf f6, the lengths thereof are respectively denoted as L1, L2, L3, L4, L5 and L6, and there is a ratio of L1: l3: l5=5:4:3, L2: l4: l6=5:4:3. the actual blades are gradually narrowed from the root to the outer end, and the length proportion of the blades is set to enable the integral area of the folded blades to be close.
Fig. 2a, 2b, 2c and 2d are cross-sectional views of fig. 1a, 1d, 1e and 1f, respectively, all showing structural views of sections of the movable blades c3 and d 4. The movable blade d4 includes a rotating blade a8, a rotating blade b12, a rotating shaft a9, a rotating shaft b11 and a tip a10, the tip a10 is fixed to the blade body 7, the rotating blade a8 and the rotating blade b12 can rotate around the rotating shaft a9 and the rotating shaft b11, respectively, and the rotation of the rotating blade a8 and the rotating blade b12 is synchronized to ensure that a stable blade structure is obtained. When the movable blade and the blade rotate to be attached to the tip end a10, the rotating blade b12, the rotating blade a8 and the tip end a10 form a stable triangular structure, the rigidity of the blade is enhanced, the windward resistance of the blade is reduced, and when the movable blade is opened, the movable blade is attached to the blade body, a stable structure is formed, and the windward resistance cannot be greatly changed.
As a preferred embodiment of the present invention, the cross-sectional shapes of the rotor blade a8 and the rotor blade b12 are isosceles triangles each having a base angle of 15 °, the cross-sectional shape of the tip a10 is an equilateral triangle, and the sides of the isosceles triangles are equal to the side length of the equilateral triangle. This arrangement ensures that the rotating blades b12 and a8 are completely attached to the tip a10, resulting in a stable structure.
As shown in fig. 2a, 2b, 2c and 2d, on the same section, the movable blade c3 is composed of a rotating blade c13, a rotating blade d17, a rotating shaft c14, a rotating shaft d16 and a tip b15 on the other side of the movable blade d4, and the structure and action principle thereof are the same as those of the movable blade d 4. The rotation of the movable blade c3 and the movable blade d4 are independent, and the combined action of the two can change the shape and the swept area of the cross section of the blade. The two movable blades on the same section can be combined into blade sections with various structures, so that the structures of the blades can be flexibly adjusted, the structural diagrams of 4 different combinations of opening and closing of the two movable blades on the same section are shown in the figures 2a, 2b, 2c and 2d, and the different combinations of the two movable blades can generate blade section shapes with different structures, have different pneumatic characteristics and can be suitable for wider working conditions.
The rotation of the movable blades on different sections is independent, and the cooperation among the movable blades a1, the movable blades b2, the movable blades c3, the movable blades d4, the movable blades e5 and the movable blades f6 flexibly adjusts the overall structure and the swept area of the blades, so that a rich adjusting strategy is provided. As a preferred embodiment of the present invention, the movable blades a1, b2, c3, d4, e5 and f6 are sequentially adjusted, and when the wind speed increases, the movable blades on both sides are sequentially opened, and when the wind speed decreases, the movable blades on both sides are sequentially closed. The specific process is shown in fig. 1a, 1b, 1c and 1d, and initially, the 6 movable blades are all in a closed state, and at this time, the swept area of the blades is the largest, the windward resistance is the smallest, and the method is suitable for the working condition with low wind speed, as shown in the overall view of fig. 1a and the cross-sectional view of fig. 2 a; as the wind speed increases, the movable blades a1 and b2 are opened, and the remaining blades remain closed, as shown in fig. 1b, and the wind speed continues to increase, the movable blades a1, b2, c3, d4 are opened, and the movable blades e5 and f6 remain closed, as shown in fig. 1 c; when the wind speed rises again, the 6 movable blades are opened, the swept area of the blades is minimum, and the windward resistance is maximum. Similarly, when the wind speed gradually decreases, the above process may be performed in reverse.
It should be noted that the control mode of sequential adjustment is not limited to the embodiment of the present invention, and the blade structure with tips and two foldable sides provided by the present invention can have various adjustment and control modes to meet the needs of various working conditions. Fig. 1e is a schematic view of the movable blade a1, the movable blade c3 and the movable blade e5 being opened, and the movable blade b2, the movable blade d4 and the movable blade f6 being closed, and fig. 1f is a schematic view of the movable blade a1, the movable blade c3 and the movable blade e5 being closed, and the movable blade b2, the movable blade d4 and the movable blade f6 being closed, referring to the sectional views of fig. 2c and fig. 2d, it can be seen that the present invention can also control the closing or opening of the single-side blade to achieve the purpose of adjusting the blade structure and changing the swept area of the blade. The above description and examples show that the present invention combines the reliability of the blade structure and the flexibility of adjustment, and can better adapt to the change of wind speed, thereby improving the efficiency of wind energy utilization.
Claims (2)
1. The utility model provides a wind-powered electricity generation blade of variable cross section, includes blade main part (7) and beta structure, its characterized in that: the foldable structure is located on two sides of the blade body (7) and is divided into 6 parts, each part of the foldable structure comprises a rotor blade a (8), a rotor blade b (12), a rotor shaft a (9), a rotor shaft b (11) and a tip a (10), the tip a (10) is fixed on the blade body (7), the rotor blade a (8) and the rotor blade b (12) can synchronously rotate around the respective rotor shaft a (9) and rotor shaft b (11) to be attached to the blade body (7) or attached to the tip a (10), when the rotor blade a (12), the rotor blade a (8) and the tip a (10) are attached to form a stable triangular structure, the foldable structure on two sides of the blade body (7) is divided into 6 parts such as a movable blade a (1), a movable blade b (2), a movable blade c (3), a movable blade d (4), a movable blade e (5) and a movable blade f (6), and the lengths of the 6 parts are respectively marked as L1, L2, L3, L4, L5 and L1 and L6: l3: l5=5:4:3, L2: l4: l6=5:4: and 3, the rotation of the blade a (1), the movable blade b (2), the movable blade c (3), the movable blade d (4), the movable blade e (5) and the movable blade f (6) are mutually independent, when the wind speed is increased, the movable blades on the two sides are sequentially opened, and when the wind speed is reduced, the movable blades on the two sides are sequentially closed.
2. A variable cross-section wind blade according to claim 1, wherein: the cross sections of the rotating blade a (8) and the rotating blade b (12) are all isosceles triangles with base angles of 15 degrees, the cross section of the tip a (10) is an equilateral triangle, and the sides of the isosceles triangles are equal to the side length of the equilateral triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610653490.4A CN106065847B (en) | 2016-08-10 | 2016-08-10 | Variable cross-section wind power blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610653490.4A CN106065847B (en) | 2016-08-10 | 2016-08-10 | Variable cross-section wind power blade |
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| Publication Number | Publication Date |
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| CN106065847A CN106065847A (en) | 2016-11-02 |
| CN106065847B true CN106065847B (en) | 2023-03-10 |
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| CN201610653490.4A Active CN106065847B (en) | 2016-08-10 | 2016-08-10 | Variable cross-section wind power blade |
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| IL54397A (en) * | 1977-04-25 | 1981-07-31 | Duracell Int | Solid state lithium cells having cathodes containing ionically and electronically conductive material |
| CN101825069B (en) * | 2010-06-04 | 2012-02-01 | 西安交通大学 | Blade folding structure for wind driven generator |
| DK177278B1 (en) * | 2011-05-19 | 2012-09-17 | Envision Energy Denmark Aps | A wind turbine and associated control method |
| CN104018996B (en) * | 2014-05-30 | 2016-06-29 | 西安交通大学 | A kind of blade of wind-driven generator for automatically adjusting front face area |
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