CN112780504B - Wind turbine blade based on plasma synthetic jet and control method - Google Patents
Wind turbine blade based on plasma synthetic jet and control method Download PDFInfo
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- CN112780504B CN112780504B CN202110043565.8A CN202110043565A CN112780504B CN 112780504 B CN112780504 B CN 112780504B CN 202110043565 A CN202110043565 A CN 202110043565A CN 112780504 B CN112780504 B CN 112780504B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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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
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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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
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/40—Ice detection; De-icing means
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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
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/60—Cooling or heating of wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/002—Influencing flow of fluids by influencing the boundary layer
- F15D1/0065—Influencing flow of fluids by influencing the boundary layer using active means, e.g. supplying external energy or injecting fluid
- F15D1/0075—Influencing flow of fluids by influencing the boundary layer using active means, e.g. supplying external energy or injecting fluid comprising electromagnetic or electrostatic means for influencing the state of the fluid, e.g. for ionising the fluid or for generating a plasma
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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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid Mechanics (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Wind Motors (AREA)
- Plasma Technology (AREA)
Abstract
The invention provides a wind turbine blade based on plasma synthetic jet and a control method, comprising a blade, wherein the surface of the blade is embedded with a U-shaped insulating shell with an opening; a cavity body is formed inside the U-shaped insulating shell, and a plasma exciter used for generating plasma is arranged inside the cavity body; the plasma exciter is connected with a controller for controlling the operation of the plasma exciter and a high-voltage power supply for supplying electric energy through leads. The wind turbine blade has certain sealing performance, can protect an exposed electrode of an exciter from being polluted, can inhibit or eliminate flow separation on the surface of the blade, and has certain icing inhibiting capacity.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a wind turbine blade based on plasma synthetic jet and a control method.
Background
Flow control technology is commonly used in the aerospace field, and in recent years, the flow control technology is gradually developed and applied to the wind power industry. The plasma synthetic jet is an active flow control mode, and has the advantages of quick response, low energy consumption and no need of adding an additional gas source. In the process of working of the plasma exciter, besides forming jet flow, the plasma exciter also can emit heat to the outside. Therefore, the plasma exciter can be arranged on the wind turbine blade and used for controlling the flow separation of the blade; after reasonable arrangement, the deicing fluid can also be used for deicing the surface of the blade.
The publication number is: CN102913386 a, name: the invention discloses a plasma flow control method for inhibiting flow separation of a suction surface of a wind turbine blade, which applies plasma to the wind turbine blade. The patent adopts a dielectric barrier discharge mode, an exposed electrode is directly arranged on a suction surface of a blade, and plasma is generated through excitation to form an adherent jet flow for controlling the flow separation of the suction surface. However, the working environment of the wind turbine is usually outdoors, the surface of the blade is often polluted by rainwater, sand, insects and the like, and the direct laying of the electrode on the surface of the blade can cause local short circuit, damage the exciter and even damage the structure of the blade. The defect is the main reason that the plasma exciter cannot be applied to wind turbine blades on a large scale.
Disclosure of Invention
The invention provides a wind turbine blade based on plasma synthetic jet and a control method thereof in order to overcome the defects of the prior art, wherein the wind turbine blade has certain sealing performance, can protect an exposed electrode of an exciter from being polluted, can inhibit or eliminate flow separation on the surface of the blade, and has certain icing inhibiting capability.
In order to achieve the technical characteristics, the invention aims to realize that: the wind turbine blade based on the plasma synthetic jet comprises a blade, wherein a U-shaped insulating shell with an opening is embedded and installed on the surface of the blade; a cavity body is formed inside the U-shaped insulating shell, and a plasma exciter used for generating plasma is arranged inside the cavity body; the plasma exciter is connected with a controller for controlling the operation of the plasma exciter and a high-voltage power supply for supplying electric energy through wires.
The U-shaped insulating shell comprises a cavity bottom side insulating plate, and a top insulating plate is fixedly supported on one side of the cavity bottom side insulating plate through a supporting insulating plate; the other sides of the insulating plate at the bottom side and the insulating plate at the top part of the cavity are provided with opening structures, and a cavity outlet is formed; the plasma exciter is arranged on the insulating plate at the bottom side of the cavity in a matching way.
The plasma exciter is composed of an exposed electrode, a covered electrode and a blocking medium; the exposed electrode is fixed on one side of the top of the blocking medium; the covering electrode is fixed on one side of the bottom of the blocking medium, and the exposed electrode, the controller, the high-voltage power supply, the covering electrode and the blocking medium are connected in series through a lead; the exposed electrode, the covered electrode and the blocking medium are fixed on any one of the insulating plate at the bottom side of the cavity, the supporting insulating plate or the top insulating plate.
A small gap is reserved between the insulating plate at the bottom side of the cavity and the insulating plate at the top, and the whole U-shaped insulating shell is embedded into the skin of the blade; while leaving the exposed electrode and the covered electrode mounted on the respective insulating plates out of contact with the other insulating plate.
The height of a cavity outlet formed by the U-shaped insulating shell is smaller than that of the supporting insulating plate, and the position of the cavity outlet is lower.
The top insulating plate is consistent with the surface curvature of the wind turbine blade.
The high-voltage power supply provides a stable and adjustable high-voltage power supply for the plasma exciter and is arranged in the blade; the controller is used for adjusting the excitation frequency and the excitation duty ratio of the plasma exciter so that the plasma exciter can work intermittently or continuously.
The control method of the wind turbine blade based on the plasma synthetic jet comprises the following steps:
step1: when the plasma exciter is connected with a power supply, after high-voltage electricity is applied between the exposed electrode and the covering electrode, air above the medium is prevented from being ionized, heat is released and plasma is generated, high-speed fluid in the cavity body is influenced by the high-voltage electricity and can be ejected from the cavity outlet to form a wall jet flow;
step2: when the plasma exciter is turned off for a short time, the plasma in the cavity disappears, the temperature is reduced, and the external fluid outside the outlet of the cavity is sucked back;
step3: the intermittent operation is adopted, the flow control of the plasma synthetic jet is realized, and the U-shaped insulating shell is arranged near the flow separation point of the blade, so that the flow separation on the surface of the blade can be greatly inhibited or eliminated;
step4: the plasma exciter can also continuously work, the wall jet flow speed is low, the temperature in the cavity body is high, and the U-shaped insulating shell is arranged at the position where the blade is easy to freeze, so that the anti-icing function of the surface of the blade is realized.
The invention has the following beneficial effects:
1. after the invention is adopted, the plasma exciter is arranged on the wind turbine blade by arranging the U-shaped insulating shell outside the plasma exciter for shielding, so that the plasma exciter can be effectively prevented from being polluted by the environment, and the service life of the plasma exciter can be effectively prolonged.
2. By adopting the blade, the plasma exciter can inhibit or eliminate the flow separation of the wind turbine blade by adopting a plurality of exciter operation modes under the condition of not changing the appearance of the wind turbine blade.
3. The plasma exciter is adopted to generate heat in the working process and is arranged at a position where the blade is easy to freeze, so that the icing on the surface of the blade can be effectively prevented.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of the overall structure of the blade of the present invention.
FIG. 2 is an enlarged view of a portion A of FIG. 1 according to the present invention.
Fig. 3 is a state diagram of the plasma exciter of the present invention when it is continuously operated by turning on the power.
Fig. 4 is a state diagram of the plasma exciter of the present invention during brief turn-off.
In the figure: the wind turbine blade comprises a wind turbine blade 1, a skin 2, a cavity bottom side insulating plate 3, a top insulating plate 4, an exposed electrode 5, a covered electrode 6, a supporting insulating plate 7, a cavity outlet 8, a blocking medium 9, a controller 10, a high-voltage power supply 11, heat 12, plasma 13, wall surface jet flow 14, external fluid 15 and a U-shaped insulating shell 16.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-4, the wind turbine blade based on plasma synthetic jet comprises a blade 1, wherein a U-shaped insulating shell 16 with an opening is embedded and installed on the surface of the blade 1; a cavity body is formed inside the U-shaped insulating shell 16, and a plasma exciter used for generating plasma is installed inside the cavity body; the plasma exciter is connected by wires to a controller 10 for controlling its operation and a high voltage power supply 11 for supplying electric power. Through the wind turbine blade, the plasma exciter is arranged inside the U-shaped insulating shell 16, so that the plasma exciter can be well protected, the plasma exciter is prevented from being polluted by the environment, and the service life of the plasma exciter can be effectively prolonged. In addition, the plasma exciter can be used for inhibiting or eliminating the flow separation of the wind turbine blade by adopting various plasma exciter operation modes under the condition that the appearance of the wind turbine blade is hardly changed, so that the icing on the surface of the blade is effectively prevented.
Further, the U-shaped insulating housing 16 includes a cavity bottom insulating plate 3, and a top insulating plate 4 is fixedly supported on one side of the cavity bottom insulating plate 3 through a supporting insulating plate 7; the other sides of the insulating plate 3 at the bottom side of the cavity and the insulating plate 4 at the top side of the cavity are provided with opening structures, and a cavity outlet 8 is formed; the plasma exciter is arranged on the insulating plate 3 at the bottom side of the cavity in a matching way. The U-shaped insulating shell 16 is made of insulating materials, so that the purpose of effective protection can be achieved.
Further, the plasma exciter is composed of an exposed electrode 5, a covered electrode 6 and a blocking medium 9; the exposed electrode 5 is fixed on one side of the top of the blocking medium 9; the covering electrode 6 is fixed on one side of the bottom of the blocking medium 9, and the exposed electrode 5, the controller 10, the high-voltage power supply 11, the covering electrode 6 and the blocking medium 9 are connected in series through a lead; the exposed electrode 5, the covered electrode 6 and the blocking medium 9 are fixed on any one of the insulating plate 3 at the bottom side of the cavity, the supporting insulating plate 7 or the top insulating plate 4. The plasma exciter described above can be used to generate plasma.
Further, a small gap is formed between the cavity bottom insulating plate 3 and the cavity top insulating plate 4, and the whole U-shaped insulating shell 16 is embedded into the skin 2 of the blade 1; while leaving the exposed electrodes 5 and the covered electrodes 6 mounted on the respective insulating plates out of contact with the other insulating plate.
Further, the insulating plate of the U-shaped insulating housing 16 should have a certain rigidity, thereby ensuring the structural strength thereof.
Further, the height of the cavity outlet 8 formed by the U-shaped insulating shell 16 is smaller than that of the supporting insulating plate 7, and the position of the cavity outlet 8 is made to be lower.
Further, the top insulating plate 4 is in accordance with the surface curvature of the wind turbine blade 1. The surface shape does not influence the fan blade.
Further, the high-voltage power supply 11 provides a stable and adjustable high-voltage power supply for the plasma exciter and is arranged inside the blade 1; the controller 10 is used for adjusting the excitation frequency and the excitation duty ratio of the plasma exciter, so that the plasma exciter can work intermittently or continuously.
Example 2:
the control method of the wind turbine blade based on the plasma synthetic jet comprises the following steps:
step1: when the plasma exciter is powered on, as shown in fig. 3, after high voltage is applied between the exposed electrode 5 and the covered electrode 6, air above the blocking medium 9 is ionized, heat 12 is released and plasma 13 is generated, high-speed fluid in the cavity body is influenced by the ionization, and is ejected from the cavity outlet 8 to form a wall jet 14;
step2: when the plasma actuator is turned off briefly, as shown in fig. 4, the plasma 13 in the chamber disappears, the temperature drops, and the external fluid 15 outside the outlet of the chamber is sucked back;
step3: the intermittent operation is adopted, the flow control of the plasma synthetic jet is realized, and the U-shaped insulating shell 16 is arranged near the flow separation point of the blade, so that the flow separation on the surface of the blade can be greatly inhibited or eliminated;
step4: the plasma exciter can also continuously work, as shown in fig. 3, at this time, the wall jet flow velocity is small, but the temperature in the cavity is high, and the U-shaped insulating shell 16 is arranged at a position where icing is easy to occur, so that the anti-icing function of the blade surface is realized.
Claims (1)
1. The wind turbine blade based on the plasma synthetic jet comprises a blade (1), wherein a U-shaped insulating shell (16) with an opening is embedded and mounted on the surface of the blade (1); a cavity body is formed inside the U-shaped insulating shell (16), and a plasma exciter used for generating plasma is installed inside the cavity body; the plasma exciter is connected with a controller (10) for controlling the operation of the plasma exciter and a high-voltage power supply (11) for supplying electric energy through leads;
the U-shaped insulating shell (16) comprises a cavity bottom side insulating plate (3), and a top insulating plate (4) is fixedly supported on one side of the cavity bottom side insulating plate (3) through a supporting insulating plate (7); the other sides of the insulating plate (3) at the bottom side of the cavity and the insulating plate (4) at the top side are provided with opening structures, and a cavity outlet (8) is formed; the plasma exciter is arranged on an insulating plate (3) at the bottom side of the cavity in a matching way;
the plasma exciter is composed of an exposed electrode (5), a covered electrode (6) and a blocking medium (9); the exposed electrode (5) is fixed on one side of the top of the blocking medium (9); the covering electrode (6) is fixed on one side of the bottom of the blocking medium (9), and the exposed electrode (5), the controller (10), the high-voltage power supply (11), the covering electrode (6) and the blocking medium (9) are connected in series through a lead; the exposed electrode (5), the covered electrode (6) and the blocking medium (9) are fixed on any one of the insulating plate (3) at the bottom side of the cavity, the supporting insulating plate (7) or the top insulating plate (4);
the high-voltage power supply (11) provides a stable and adjustable high-voltage power supply for the plasma exciter and is arranged inside the blade (1); the controller (10) is used for adjusting the excitation frequency and the excitation duty ratio of the plasma exciter so that the plasma exciter can work intermittently or continuously;
the U-shaped insulating shell (16) is arranged at a position where the blade is easy to freeze, and the plasma exciter continuously works, so that the wall jet flow velocity is low, the temperature in a cavity is high, and the anti-freezing function of the surface of the blade is realized;
a small gap is reserved between the insulating plate (3) at the bottom side of the cavity and the insulating plate (4) at the top, and the whole U-shaped insulating shell (16) is embedded into the skin (2) of the blade (1); while leaving the exposed electrode (5) and the covered electrode (6) mounted on the respective insulating plates out of contact with the other insulating plate;
the height of a cavity outlet (8) formed by the U-shaped insulating shell (16) is smaller than that of the supporting insulating plate (7), and the position of the cavity outlet (8) is lower;
the top insulating plate (4) is consistent with the surface curvature of the wind turbine blade (1);
the control method is characterized by comprising the following steps of:
step1: when the plasma exciter is powered on, after high voltage is applied between the exposed electrode (5) and the covered electrode (6), air above the blocking medium (9) is ionized, heat (12) is released and plasma (13) is generated, and high-speed fluid in the cavity body is influenced by the ionization and is ejected from the cavity body outlet (8) to form a wall jet flow (14);
step2: when the plasma exciter is turned off briefly, the plasma (13) in the cavity disappears, the temperature drops, and the external fluid (15) outside the cavity outlet is sucked back;
step3: the intermittent operation is adopted, the flow control of the plasma synthetic jet is realized, and the U-shaped insulating shell (16) is arranged near the flow separation point of the blade, so that the flow separation on the surface of the blade can be greatly inhibited or eliminated;
step4: the plasma exciter can also continuously work, the wall surface jet flow velocity is small at the moment, the temperature in the cavity is high, and the U-shaped insulating shell (16) is arranged at the position where the blade is easy to freeze, so that the anti-freezing function of the blade surface is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110043565.8A CN112780504B (en) | 2021-01-13 | 2021-01-13 | Wind turbine blade based on plasma synthetic jet and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110043565.8A CN112780504B (en) | 2021-01-13 | 2021-01-13 | Wind turbine blade based on plasma synthetic jet and control method |
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| Publication Number | Publication Date |
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| CN112780504A CN112780504A (en) | 2021-05-11 |
| CN112780504B true CN112780504B (en) | 2023-03-24 |
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| CN202110043565.8A Active CN112780504B (en) | 2021-01-13 | 2021-01-13 | Wind turbine blade based on plasma synthetic jet and control method |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3830450A (en) * | 1972-12-15 | 1974-08-20 | Us Navy | Dual purpose circulation control airfoil |
| US5791601A (en) * | 1995-08-22 | 1998-08-11 | Dancila; D. Stefan | Apparatus and method for aerodynamic blowing control using smart materials |
| US9239039B2 (en) * | 2008-10-27 | 2016-01-19 | General Electric Company | Active circulation control of aerodynamic structures |
| US9133819B2 (en) * | 2011-07-18 | 2015-09-15 | Kohana Technologies Inc. | Turbine blades and systems with forward blowing slots |
| CN103410680B (en) * | 2013-06-19 | 2016-01-20 | 中国科学院电工研究所 | For plasma control apparatus and the method for blade of wind-driven generator |
| CN109665093B (en) * | 2019-01-16 | 2023-02-28 | 西北工业大学 | Wing profile capable of delaying flow separation and exciter arranged on wing profile |
| CN111688912B (en) * | 2020-05-25 | 2022-01-07 | 西安理工大学 | Plasma air suction device for wing drag reduction |
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Effective date of registration: 20231225 Address after: 430010 No.1, Liuhe Road, Jiang'an District, Wuhan City, Hubei Province Patentee after: CHINA THREE GORGES Corp. Patentee after: Three Gorges Land New Energy Investment Co.,Ltd. Address before: No. 1 yuyuyutan South Road, Beijing, Beijing Patentee before: CHINA THREE GORGES Corp. |