JP2017091618A - Air flow generator, windmill wing, and windmill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air flow generator, a windmill wing, and a windmill capable of suppressing performance deterioration, e.g., power reduction, by reducing impairment of a substrate and an electrode, even if a flying object, such as a hail, collides.SOLUTION: An air flow generator generating an air flow includes a substrate formed of a flexible dielectric, a first electrode provided on the surface of the substrate, a second electrode provided, in the substrate, on the downstream side of the first electrode in the air flow generation direction, and an elastomer layer provided, on the surface of the substrate, on the upstream side of the first electrode in the air flow generation direction, and having erosion resistance higher than that of the substrate. The air flow generator generates an air flow when a voltage is applied between the first and second electrodes.SELECTED DRAWING: Figure 3

Description

  Embodiments described herein relate generally to an airflow generation device, a windmill blade, and a windmill.

  Power reduction in fluid equipment is becoming increasingly important from the viewpoint of energy saving. In order to reduce the power of a fluid device such as a windmill, for example, there is one provided with an airflow generation device that generates an airflow by the action of plasma.

  When a windmill is provided with an airflow generator, an airflow generator is installed in the windmill blade which comprises a windmill. This airflow generating device generates a very thin layered induced airflow near the surface of the wind turbine blade while appropriately controlling it. The induced airflow generated by the airflow generator changes the flow velocity distribution in the boundary layer of the wind turbine blade, forcibly causes a transition from the laminar boundary layer to the turbulent boundary layer, or generates or extinguishes vortices. It is possible to realize airflow control such as.

  Such an airflow generation device is provided on the surface of a wind turbine blade, and includes a base formed of a dielectric and a pair of electrodes provided via the base. The pair of electrodes includes a first electrode formed on the surface of the base and a second electrode buried in the base on the downstream side in the direction of generating an air flow with respect to the first electrode. Then, a voltage of, for example, about 1 to 10 kV is applied to these electrodes, and a discharge region is generated on the surface of the voltage application portion of the base located between the first electrode and the second electrode, and exists on the surface. The airflow generation device generates an airflow by converting a part of the gas to be converted into plasma. The generated airflow flows from the first electrode to the second electrode on the surface of the wind turbine blade.

  As described above, the fluid device includes the air flow generation device, whereby the gas flow on the surface of the fluid device is controlled. Therefore, this airflow generation device can be used for various industrial equipment as an innovative element technology.

JP 2007-317656 A JP 2012-255431 A

  In a windmill provided with an airflow generation device as described above, the airflow generation device is disposed at the leading edge (leading edge) of the windmill blade from the viewpoint of efficiency of power reduction in the windmill. When this windmill blade rotates, flying objects such as kites and kites collide with an airflow generator provided at the front edge of the windmill blade. For this reason, the substrate and the electrodes constituting the airflow generation device may be damaged by erosion.

  When the dielectric substrate is damaged, the substrate is eroded and the thickness of the substrate is reduced. For this reason, the voltage application portion of the substrate located between the first electrode and the second electrode may not be able to maintain the voltage necessary for generating the discharge and may be short-circuited. As a result, the airflow generation device cannot generate discharge, and airflow control of the wind turbine blades may be difficult. In addition, the first electrode provided on the surface of the substrate may be damaged, and the wiring that supplies voltage to the first electrode may be disconnected.

  For example, when the electrodes are thickened to reduce problems such as short circuit and disconnection, these problems may be improved even if flying objects collide with the airflow generator provided at the front edge of the wind turbine blade. . However, since the applied voltage required for generating the discharge increases, the energy for driving the airflow generator increases, and the power of the windmill may increase. Furthermore, as the electrode becomes thicker, the electrode is less likely to be deformed. For this reason, the workability of the electrode is lowered, and it may be difficult to attach the airflow generation device to the wind turbine blade.

  The problem to be solved by the present invention is that an airflow generator and a wind turbine blade that can reduce damage to the base and the electrode and suppress performance degradation such as power reduction even when flying objects such as kites and kites collide. And to provide a windmill.

  An airflow generation device according to an embodiment is a device that generates an airflow, and includes a base formed of a flexible dielectric, a first electrode provided on a surface of the base, and an inside of the base. A second electrode provided downstream of the first electrode in the direction in which the air flow is generated, and a surface of the base on the upstream side in the direction of generating the air flow from the first electrode. And an elastomer layer having higher erosion resistance than the substrate. The airflow generation device generates an airflow by applying a voltage between the first electrode and the second electrode.

It is a perspective view which shows typically a windmill provided with the windmill blade which provided the airflow generation device of embodiment. It is a perspective view which shows typically a windmill blade provided with the airflow generation device of embodiment. It is sectional drawing which shows typically a windmill blade provided with the airflow generation device of embodiment. It is sectional drawing which shows typically an example of the airflow generator of embodiment. It is sectional drawing which shows typically an example of the airflow generator of embodiment. It is sectional drawing which shows the flow of the airflow on a blade upper surface. It is sectional drawing which shows the flow of the airflow on a blade upper surface. It is sectional drawing which shows the flow of the airflow on a blade upper surface. It is sectional drawing which shows typically the airflow generator of an Example.

  Hereinafter, embodiments will be described with reference to the drawings.

  The windmill 1 provided with the windmill blade 42 which provided the airflow generation device 6 of embodiment is demonstrated.

  Drawing 1 is a perspective view showing typically windmill 1 provided with windmill blade 42 which provided airflow generating device 6 of an embodiment. As shown in FIG. 1, the windmill 1 includes a tower 2, a nacelle 3, a rotor 4, an anemometer 5, an airflow generator 6 provided on a windmill blade 42, and the like. Although FIG. 1 shows an upwind wind turbine 1, the wind turbine 1 may adopt a downwind method.

  The tower 2 extends along the vertical direction, and the lower end of the tower 2 is fixed to a base (not shown) embedded in the ground. A nacelle 3 is attached to the upper end of the tower 2.

  The nacelle 3 is supported at the upper end of the tower 2 so as to be rotatable about the vertical direction in order to adjust the yaw angle. A generator (not shown) and the like are accommodated in the nacelle 3.

  At the windward side end of the nacelle 3, there is provided a rotor 4 that is connected to a rotating shaft of a generator housed in the nacelle 3 and is rotatably supported by the nacelle 3. For example, as shown in FIG. 1, the rotor 4 rotates along the rotation direction R with the horizontal direction as a rotation axis. The rotor 4 includes a hub 41 and a plurality of wind turbine blades 42. Here, although the windmill 1 provided with the three windmill blades 42 is shown, the number of the windmill blades 42 is not specifically limited.

  The hub 41 has a semi-elliptical tip cover and is formed so that the outer diameter of the outer peripheral surface increases from the windward side toward the leeward side. A blade root of a wind turbine blade 42 is connected to the hub 41. Each of the plurality of wind turbine blades 42 extends radially at equal intervals in the rotation direction R around the hub 41. The wind turbine blade 42 is supported by the hub 41 so as to be rotatable about the direction from the root of the wind turbine blade 42 toward the blade tip (hereinafter also referred to as the longitudinal direction of the wind turbine blade 42) for adjusting the pitch angle. Yes. An airflow generator 6 is installed on the surface of the windmill blade 42.

  An anemometer 5 is attached to the upper surface of the nacelle 3. The wind direction anemometer 5 measures the direction and speed of the wind and outputs the measurement data to a control unit (not shown).

  Next, the windmill blade 42 provided with the airflow generation device 6 of the embodiment will be described.

  FIG. 2 is a perspective view schematically showing a wind turbine blade 42 including the airflow generation device 6 according to the embodiment. FIG. 3 is a cross-sectional view schematically showing a wind turbine blade 42 including the airflow generation device 6 according to the embodiment. As shown in FIG. 2, the airflow generator 6 is installed at the front edge 43 of the wind turbine blade 42. Here, the plurality of airflow generation devices 6 are disposed at the leading edge 43 at a predetermined interval along the direction from the blade root of the wind turbine blade 42 toward the blade tip. As will be described later, the airflow generation device 6 generates an airflow that flows along the direction L from the front edge 43 toward the rear edge 44 on the blade upper surface 42 a of the wind turbine blade 42.

  As shown in FIG. 3, a first electrode 61 is provided on the surface of the base body 60 constituting the airflow generation device 6. A portion of the airflow generation device 6 on the upstream side in the direction L in which the airflow is generated from the downstream end 61 a of the first electrode 61 is disposed at the front edge 43 of the wind turbine blade 42. The portion on the upstream side in the direction L from the downstream end 61a of the first electrode 61 is a portion where the first electrode 61 and the elastomer layer 63 in the airflow generation device 6 are formed. Here, the front edge 43 of the wind turbine blade 42 is the portion most easily damaged by erosion.

  The elastomer layer 63 provided in the airflow generation device 6 is provided on the front edge 43 of the wind turbine blade 42 in order to suppress damage to a discharge area 67 described later due to erosion. Further, the discharge region 67 generated by the airflow generation device 6 is not provided at the front edge 43. For example, as shown in FIG. 3, at least a part of the elastomer layer 63 is provided at the front edge 43, and the discharge region 67 does not occur at the front edge 43.

  Next, the airflow generation device 6 of the embodiment will be described.

  FIG. 4 is a cross-sectional view schematically showing an example of the airflow generation device 6 according to the embodiment. As shown in FIGS. 3 and 4, the airflow generation device 6 includes a base body 60, a first electrode 61 provided on the surface of the base body 60, a second electrode 62 provided inside the base body 60, An erosion-resistant elastomer layer 63 provided on the surface of the substrate 60, and a discharge power source 66 capable of applying a voltage between the first electrode 61 and the second electrode 62 via the wirings 64 and 65, and Etc. The airflow generation device 6 applies a voltage between the first electrode 61 and the second electrode 62 from the discharge power supply 66, so that the blade upper surface 42 a of the wind turbine blade 42 is moved from the front edge 43 to the rear edge. An airflow that flows along a direction L toward 44 is generated. Hereinafter, the direction in which the airflow generation device 6 generates the airflow may be referred to as a direction L.

  As shown in FIGS. 2 and 4, the base body 60 extends on the surface of the wind turbine blade 42 along the longitudinal direction of the wind turbine blade 42. Further, as shown in FIGS. 3 and 4, a first electrode 61 is provided on the surface (upper surface) of the base body 60. A second electrode 62 is provided inside the base body 60. Further, the back surface (lower surface) of the base body 60 facing the surface of the base body 60 is supported by the surface of the wind turbine blade 42 (blade upper surface 42a).

  As shown in FIGS. 3 and 4, the shape of the base body 60 is a plate shape here, but is not particularly limited. For example, the cross-sectional shape of the base body 60 may be a semicircular shape or a crescent shape. Further, the end shape of the base body 60 is not limited to a square shape, and may be rounded like an arc shape, for example.

  The base 60 is formed of a flexible dielectric (insulator). For example, the base body 60 is formed of a resin such as a silicone resin, a polyimide resin, an epoxy resin, or a fluororesin. In addition, the base body 60 may be formed by, for example, laminating a plurality of prepreg sheets obtained by impregnating mica paper with an epoxy resin.

  As shown in FIGS. 2 to 4, the first electrode 61 is formed of a plate-like flat plate electrode and extends on the surface of the base body 60 along the longitudinal direction of the wind turbine blade 42. Note that the shape of the first electrode 61 is not limited to a plate shape, and may be, for example, a rod shape having a circular or rectangular cross section.

  The first electrode 61 is made of a general electrode material. For example, the first electrode 61 is formed of a metal material such as copper, nickel, titanium, molybdenum, tungsten, or an alloy such as stainless steel.

  As shown in FIGS. 2 to 4, the second electrode 62 is formed of a plate-like flat plate electrode, and in the base 60 along the longitudinal direction of the wind turbine blade 42, the direction L is greater than that of the first electrode 61. The first electrode 61 is spaced apart from the first electrode 61. Further, as shown in FIG. 4, the downstream end 62 a of the second electrode 62 is disposed on the downstream side in the direction L from the downstream end 61 a of the first electrode 61. Here, a part of the first electrode 61 and a part of the second electrode 62, more specifically, a part of the first electrode 61 located on the downstream side in the direction L and an upstream side in the direction L. The second electrode 62 is provided so that a part of the second electrode 62 faces through the base body 60. The shape of the second electrode 62 is not limited to a plate shape, and may be, for example, a bar shape such as a circle or rectangle in cross section. Further, the shape of the first electrode 61 and the shape of the second electrode 62 may be the same or different.

  Similar to the first electrode 61, the second electrode 62 is made of a metal material such as copper, nickel, titanium, molybdenum, tungsten, or an alloy such as stainless steel.

  As shown in FIGS. 2 to 4, the elastomer layer 63 extends on the surface of the base body 60 on the upstream side in the direction L from the first electrode 61 along the longitudinal direction of the wind turbine blade 42. At this time, as shown in FIG. 4, the adhesive portion between the first electrode 61 and the base body 60 located on the upstream end 61 b side of the first electrode 61 is covered with an elastomer layer 63.

  Here, another example of the airflow generation device 6 of the embodiment will be described. FIG. 5 is a cross-sectional view schematically illustrating an example of the airflow generation device according to the embodiment. In FIG. 4, the airflow generation device 6 including the elastomer layer 63 formed only on the surface of the base body 60 is illustrated. However, as illustrated in FIG. 5, the airflow generation device 6 a includes at least the surface of the first electrode 61. A first elastomer layer 63a having erosion resistance provided in part is further provided. Here, the first elastomer layer 63 a is provided on the entire surface of the first electrode 61. When the first elastomer layer 63 a is provided on at least a part of the surface of the first electrode 61, the elastomer layer 63 provided on the surface of the base 60 and the first electrode provided on the surface of the first electrode 61. The elastomer layer 63a may be provided continuously or discontinuously.

  As will be described later, as shown in FIGS. 3 to 5, the airflow generators 6 and 6 a generate a discharge region 67 in the vicinity of the surface of the base body 60 and in the downstream in the direction L from the first electrode 61. Let Therefore, the elastomer layer 63 and the first elastomer layer 63 a are not provided on the surface of the base body 60 on the downstream side in the direction L from the first electrode 61.

  The elastomer layer 63 and the first elastomer layer 63a have higher erosion resistance than the base 60, the first electrode 61, and the second electrode 62. The elastomer layer 63 and the first elastomer layer 63a having excellent erosion resistance are formed of, for example, at least one selected from the group consisting of nitrile rubber-based, natural rubber-based, and urethane rubber-based elastomers. ing. Furthermore, the elastomer layer 63 and the first elastomer layer 63a may have ceramic particles dispersed therein. Here, erosion is a phenomenon in which damage such as erosion occurs due to collision with flying objects.

  The discharge power supply 66 applies a voltage between the first electrode 61 and the second electrode 62 via wirings 64 and 65 as shown in FIGS. The discharge power supply 66 functions as a voltage application mechanism, and includes, for example, a power supply device (not shown) attached to the blade root portion of the wind turbine blade 42, and applies a voltage using the power supply device. For example, the discharge power supply 66 applies a voltage between the first electrode 61 and the second electrode 62 in accordance with a control signal output from a control unit (not shown). The discharge power supply 66 may be configured such that one discharge power supply 66 applies a voltage independently to each of the plurality of airflow generation devices 6 as shown in FIGS. 1 and 2. The discharge power source 66 may be configured to individually apply a voltage to each of the plurality of airflow generation devices 6.

  As shown in FIGS. 3 to 5, the wirings 64 and 65 electrically connect each of the first electrode 61 and the second electrode 62 and the discharge power source 66. Specifically, the wiring 64 has one end electrically connected to the first electrode 61 and the other end electrically connected to the discharge power source 66. The wiring 65 has one end electrically connected to the second electrode 62 and the other end electrically connected to the discharge power source 66.

  Next, a method for manufacturing the airflow generation device 6 will be described.

  First, the second electrode 62 is provided inside the base body 60. Subsequently, the first electrode 61 is provided on the upper surface of the base 60 having the second electrode 62 therein. Subsequently, an elastomer layer 63 is provided on the upper surface of the base body 60 positioned upstream of the first electrode 61 in the direction L. Moreover, the 1st elastomer layer 63a is provided in the upper surface of the 1st electrode 61 as needed. The first electrode 61 and the elastomer layer 63 are provided on the base body 60 by, for example, a known adhesion method using an adhesive. In this way, the airflow generation device 6 can be manufactured.

  In addition, the manufacturing method of the airflow generator 6 is not restricted to this. For example, in the manufacturing method described above, a base made of a first base portion and a second base portion is used in place of the base 60, and the second electrode is provided between the first base portion and the second base portion. 62 may be provided. In addition, for example, the airflow generation device 6 may be manufactured using various processing methods such as press processing and extrusion processing.

  Next, a phenomenon in which an airflow flowing along the direction L is generated by the airflow generator 6 will be described.

  As shown in FIGS. 3 and 4, when a voltage is applied between the first electrode 61 and the second electrode 62 from the discharge power supply 66 and a potential difference equal to or greater than the threshold value is reached, A discharge region 67 is generated downstream of the first electrode 61 in the direction L. This discharge area 67 does not occur at all at the front edge 43 of the wind turbine blade 42. In the discharge region 67, barrier discharge is induced and low temperature plasma is generated. In the barrier discharge, energy can be given only to the electrons in the gas, so that the gas can be ionized and the electrons and ions can be generated with little heating of the gas. The generated electrons and ions are driven by an electric field, and momentum shifts to gas molecules when they collide with gas molecules. That is, an air flow can be generated in the vicinity of the electrode by applying a discharge. The generated airflow flows along a direction L from the front edge 43 toward the rear edge 44 on the blade upper surface 42a of the wind turbine blade 42 as shown in FIGS. The magnitude of the airflow can be controlled by changing the current-voltage characteristics such as the voltage, frequency, current waveform, and duty ratio applied to the electrodes. Since the discharge region 67 is generated on the downstream side in the direction L from the first electrode 61, the elastomer layer 63 is provided on the surface of the base body 60 on the downstream side in the direction L from the first electrode 61. I can't. That is, when the elastomer layer 63 is provided at the location where the discharge region 67 is generated, the discharge region 67 is not generated.

  Next, the effect of the airflow generated by the airflow generator 6 on the flow around the wind turbine blade 42 will be described.

  6, 7 and 8 are cross-sectional views showing the flow of airflow on the blade upper surface 42a. As shown in FIG. 6, when a flow is attached around the wind turbine blade 42, lift is generated on the wind turbine blade 42 due to the difference between the flow velocity of the blade upper surface 42a and the flow velocity of the blade lower surface 42b. Increasing the angle of attack α of the wind turbine blade 42 increases the lift, but above a certain angle of attack, the flow separates from the blade upper surface 42a and the lift decreases as shown in FIG. Therefore, as shown in FIG. 8, when the air flow generator 6 is provided at a portion where the flow separation occurs on the blade upper surface 42 a, for example, the front edge 43 of the wind turbine blade 42 to generate the air flow, the flow velocity distribution in the boundary layer changes. , The occurrence of flow separation can be suppressed.

  As shown in FIG. 2, the airflow generation device 6 is disposed so as to generate an airflow in a direction along the rear edge 44 from the front edge 43 of the blade upper surface 42a. Moreover, each airflow generator 6 can be individually controlled. Therefore, the current-voltage characteristics applied to the first electrode 61 and the second electrode 62 can be changed according to the flow state around the wind turbine blade 42. In particular, in the horizontal axis wind turbine, the peripheral speed differs between the tip of the wind turbine blade and the blade root, but since each airflow generator 6 can be controlled individually, it is optimal for the flow of the tip of the wind turbine blade and the blade root. It is possible to control the airflow generator 6.

  As described above, according to the airflow generation device of the embodiment, the elastomer layer 63 having higher erosion resistance than the base 60 and the first electrode 61 is disposed upstream of the first electrode 61 in the direction L. It is provided to cover. Therefore, even if flying objects such as kites and kites collide with the airflow generation device, damage to the base 60 due to erosion can be reduced, and performance degradation such as power reduction can be suppressed. Furthermore, since the bonded portion between the first electrode 61 located on the upstream end 61b side of the first electrode 61 and the base body 60 is protected by the elastomer layer 63, the first electrode 61 due to the collision of flying objects. The peeling from the substrate 60 is suppressed.

  Furthermore, the airflow generation device includes a first elastomer layer 63 a that covers at least a part of the first electrode 61. Therefore, damage to the first electrode 61 due to erosion can be reduced, and performance degradation can be further suppressed.

  In addition, since the elastomer layer can be formed from various elastomers, the degree of freedom in selecting the elastomer is high. Furthermore, since the elastomer layer is formed by dispersing ceramic particles, the mechanical strength and erosion resistance of the elastomer layer 63 can be further improved.

  In addition, the wind turbine blade is provided with at least a part of the elastomer layer 63 on the front edge 43, and is provided with an airflow generation device so that the discharge region 67 is not generated on the front edge 43. Therefore, since the discharge region 67 is protected from damage due to erosion, the base body is not short-circuited, and the airflow generator installed on the wind turbine blade can stably generate the airflow.

  Hereinafter, a detailed description will be given with reference to examples. In addition, this invention is not limited at all by these Examples.

(Example)
FIG. 9 is a cross-sectional view schematically showing the airflow generation device 6b manufactured in the example. First, a sheet made of a silicone resin having a thickness of 0.5 mm, which is a dielectric, was prepared as the first base portion 60a constituting the base 60. Subsequently, a first electrode 61 made of a copper ribbon having a length of 100 mm, a width of 5 mm, and a thickness of 0.1 mm was provided on the upper surface of the first base portion 60a via a double-sided tape. Further, on the lower surface of the first base portion 60a, on the downstream side in the direction L from the first electrode 61, a copper ribbon made of copper ribbon having a length of 100 mm, a width of 5 mm, and a thickness of 0.1 mm is provided via a double-sided tape. Two electrodes 62 were provided. Subsequently, a nitrile having a thickness of 0.2 mm is interposed between the upper surface of the first electrode 61 and the upper surface of the first base portion 60a on the upstream side in the direction L from the first electrode 61 with a double-sided tape. A rubber sheet-like elastomer layer 63b was provided. At this time, the elastomer layer 63 b is not provided in the discharge region 67 generated in the vicinity of the base body 60. Further, the erosion resistance of the elastomer layer 63b is higher than the erosion resistance of the first base portion 60a, the second base portion 60b, the first electrode 61, and the second electrode 62. Subsequently, a second base portion 60b made of silicone resin having a thickness of 0.5 mm, which is a dielectric, was provided on the lower surface of the first base portion 60a via a double-sided tape. In this way, the airflow generator 6b was manufactured.

  Next, similarly to the windmill blade 42 shown in FIGS. 2 and 3, the above manufacturing is performed on the surface of the windmill blade 42 with a double-sided tape so that the elastomer layer 63 b is disposed on the front edge 43 of the windmill blade 42. The airflow generator 6b was provided. At this time, the portion upstream of the downstream end 61a of the first electrode 61 provided in the airflow generation device 6b in the direction L is disposed at the front edge 43 of the wind turbine blade 42, and the discharge generated by the airflow generation device 6b. The region 67 is not disposed on the leading edge 43. Thus, the wind turbine blade provided with the airflow generation device 6b was manufactured.

  Next, as an erosion test of the wind turbine equipped with the manufactured wind turbine blade, alumina particles having a diameter of 0.2 mm are sprayed at a speed of about 80 m / s for 3 minutes onto the leading edge 43 of the wind turbine blade using a sand blast machine. It was. At this time, an erosion test was performed so that the linearly flying alumina particles released from the sandblasting machine were sprayed onto the elastomer layer 63b. In the erosion test, the linearly flying alumina particles released from the sandblasting machine are not sprayed on the discharge region 67. Here, the peripheral speed of the blade tip of the wind turbine blade in a 2 MW class wind turbine is about 80 m / s. In addition, flying objects in the windmill were regarded as alumina particles.

  After the alumina particles were sprayed, an AC voltage of 7 kV was applied to the airflow generator 6b for 1 minute to evaluate whether the airflow generator 6b generates an airflow. As a result, the base of the airflow generator was not short-circuited, and the airflow generator 6b was able to generate airflow stably.

(Comparative example)
An airflow generator and a wind turbine blade were manufactured in the same manner as in the example except that the elastomer layer 63b in the above example was not provided. Moreover, the erosion test was implemented by the method similar to an Example. As a result, the application time was 10 seconds, and the substrate was short-circuited. For this reason, the airflow generation device cannot generate an airflow in a short time.

  As described above, according to the examples and comparative examples, the erosion resistance can be improved by installing the elastomer layer having excellent erosion resistance such as nitrile rubber on the airflow generator, the wind turbine blade, and the windmill. did it.

  According to at least one embodiment described above, even if a flying object such as a kite or kite collides, damage to the base and the electrode can be reduced, and performance degradation such as power reduction can be suppressed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Windmill, 2 ... Tower, 3 ... Nacelle, 4 ... Rotor, 5 ... Wind direction anemometer, 6, 6a, 6b ... Airflow generator, 41 ... Hub, 42 ... Windmill blade, 42a ... Blade upper surface, 42b ... Blade lower surface , 43 ... front edge, 44 ... rear edge, 60 ... base, 60a ... first base part, 60b ... second base part, 61 ... first electrode, 61a ... downstream end, 61b ... upstream end, 62 ... Second electrode, 62a ... downstream end, 63, 63b ... elastomer layer, 63a ... first elastomer layer, 64, 65 ... wiring, 66 ... discharge power source, 67 ... discharge region.

Claims (5)

An airflow generating device that generates an airflow,
A substrate formed of a flexible dielectric;
A first electrode provided on the surface of the substrate;
A second electrode provided on the downstream side in the direction of generating the airflow from the first electrode inside the base;
Provided on the surface of the base on the upstream side in the direction of generating the airflow from the first electrode, and an elastomer layer having higher erosion resistance than the base;
An airflow generation device that generates the airflow when a voltage is applied between the first electrode and the second electrode.   The airflow generation device according to claim 1, wherein the elastomer layer is also provided on at least a part of the surface of the first electrode.   The airflow generation device according to claim 1 or 2 is provided at a leading edge of a blade, and a portion of the airflow generation device that is upstream from the downstream end of the first electrode is disposed at the front edge. Windmill wings.   The wind turbine blade according to claim 3, wherein at least a part of the elastomer layer is provided on the front edge.   A windmill comprising the windmill blade according to claim 3 or 4.

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