CN214403865U

CN214403865U - Wind turbine blade based on plasma synthetic jet

Info

Publication number: CN214403865U
Application number: CN202120085800.3U
Authority: CN
Inventors: 马璐; 于光明; 张泽超; 罗仑博; 杨静; 林琳
Original assignee: China Three Gorges Corp
Current assignee: China Three Gorges Corp
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-10-15
Anticipated expiration: 2031-01-13

Abstract

The utility model provides a wind turbine blade based on plasma synthetic jet, which 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 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

Wind turbine blade based on plasma synthetic jet

Technical Field

The utility model relates to a wind power generation technical field especially relates to wind energy conversion system blade based on plasma synthetic efflux.

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 fast 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: CN 102913386A, name: the utility model discloses a plasma flow control method for restraining 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 by excitation to form a strand of 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, sandy soil, insects and the like, and the direct laying of the electrodes on the surface of the blade can cause local short circuit, damage the exciter and even damage the blade structure. The defect is the main reason that the plasma exciter cannot be applied to wind turbine blades on a large scale.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome prior art not enough, provide the wind turbine blade based on plasma synthetic efflux, this wind turbine blade it has certain leakproofness, can protect the exciter to expose the electrode and not receive the pollution, can restrain or eliminate blade surface flow separation, and have certain suppression ability of freezing.

In order to realize the technical characteristics, the purpose of the utility model is realized as follows: 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 leads.

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 mode.

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 utility model discloses there is following beneficial effect:

1. adopt the utility model discloses afterwards, shelter from through setting up one deck U type insulating casing in plasma exciter outside, arrange it on wind energy conversion system blade, can prevent effectively that plasma exciter from by environmental pollution, can effectively prolong plasma exciter life.

2. Through adopting the utility model discloses a blade, plasma exciter can adopt multiple exciter operating mode to restrain or eliminate wind turbine blade flow separation under the condition that does not change wind turbine blade appearance.

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 present invention will be further explained with reference to the drawings 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 powered on for continuous operation.

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

The following describes embodiments of the present invention 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, and the icing on the surface of the blade is effectively prevented.

Further, the U-shaped insulating shell 16 comprises 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 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:

step 1: 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;

step 2: 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;

step 3: 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;

step 4: 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. Wind turbine blade based on plasma synthetic jet, its characterized in that: the blade 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 work of the plasma exciter and a high-voltage power supply (11) for supplying electric energy through leads.

2. The wind turbine blade of claim 1, wherein: 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.

3. The wind turbine blade based on plasma synthetic jet according to claim 1 or 2, characterized in that: 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).

4. The wind turbine blade of claim 3, wherein: 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.

5. The wind turbine blade of claim 2, wherein: 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.

6. The wind turbine blade of claim 2, wherein: the top insulating plate (4) is consistent with the surface curvature of the wind turbine blade (1).

7. The wind turbine blade of claim 3, wherein: 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.