WO2014098527A1

WO2014098527A1 - Air resistance reduction device for fatigue test for blade and method for installing same

Info

Publication number: WO2014098527A1
Application number: PCT/KR2013/011974
Authority: WO
Inventors: 이학구; 박지상; 윤순호; 문진범; 김진봉; 김지훈; 강민규; 김홍관; 이우경; 박중규
Original assignee: 한국기계연구원 부설 재료연구소
Priority date: 2012-12-20
Filing date: 2013-12-20
Publication date: 2014-06-26
Also published as: KR101401082B1; CN104854442A

Abstract

An air resistance reduction device for a fatigue test for a blade, according to one embodiment of the present invention, comprises an air resistance reduction means which has a closed-loop cross sectional shape so as to accommodate a wind power blade therein, and maintains a separated state from both sides of the window power blade so as to reduce air resistance generated during a fatigue test, wherein the inside of the air resistance reduction means is provided with a support part for forming a filling space such that a portion of the outside of the air resistance reduction means forms a curved surface. A method for installing the air resistance reduction device for a fatigue test for a blade, according to one embodiment of the present invention, comprises: a preparation step of preparing an air resistance reduction means which has a closed-loop cross sectional shape, and which is provided with a support part having a filling space in which a fluid including gas is filled; an installation step of installing the air resistance reduction means on an outer side of a blade; and a completion step of forming a pair of curved portions which have curved surfaces and are separated from both sides of the blade by filling the filling space with the fluid, and forming a plane portion having a plane between the pair of curved portions.

Description

【Specification】

[Name of invention]

Air resistance reduction device for blade fatigue test and its installation method

The present invention relates to an air resistance reduction device for fatigue testing of a wind blade (Blade), and more particularly, fatigue of the blade provided to one side of the blade during the fatigue test to reduce the air resistance generated in the vertically acting blade The present invention relates to a test air resistance reducing device and a method of installing the same.

The present invention is applicable to blades of various shapes and sizes, light and easy to install soybean resistance test device for fatigue testing of Bleo H and a method for installing the same.

Background Art

<3> The blade H (Blade) for the wind power generation to generate the lift, thrust and control force necessary for the flight in that it is used to obtain the rotational force required to rotate the electric motor for generating electric power. There is a difference from the blade for the aircraft.

<4> Blades used in wind power generation cause changes in aerodynamic distribution around the blead during the cease-fire, which causes bending loads on the blast structure.

<5>

<6> For the safe operation of the blade, it is necessary to verify the fatigue life against fatigue bending loads that occur for at least 20 years, and the fatigue test method uses the resonance frequency of the blade.

There are resonance testing using natural frequency, and force displacement testing, which determines the amplitude and frequency of excitation directly by using a grounded exciter.

<?> The ball residue test method is the most widely used because it can not only increase the required excitation amplitude, but also can achieve the required fatigue test within a short test time.

In the existing resonance test method, the end of the blade is fixed, and the excitation and heavy materials are installed to obtain the target amplitude in the vertical direction. However, if this method is used, high air resistance will be generated in the flap wise direction of the blade, and the desired amplitude will not be obtained. In addition, there is a problem that the need for more excitation force is greatly reduced the efficiency of the fatigue test.

The blade travels a distance of about 16, 000 km during one million fatigue test cycles during the fatigue test, and reaches a maximum speed of 40 km / h at the blade tip. It becomes bigger. Therefore, there is a need for measures to overcome the problem of air resistance during fatigue tests.

<10>

Meanwhile, the prior art US Patent Publication US2012-0020798 was intended to reduce the air resistance generated in the blade by installing an additional structure on the blade as shown in FIG.

According to one embodiment of the prior art, a streamlined member covering the top surface of the blade 10.

In order to fix the 5a and 5b and the streamlined members 5c and 5d covering the lower surface to the blade 10, a plurality of strings 3a, 3b, 3c and 3d are used. At this time, the leading edge 14a and the trailing edge 14b of the blade 10 are exposed to the outside.

In addition, according to another embodiment of the prior art, a streamlined subsidiary system is integrally formed so as not to expose the leading edge 14a and trailing edge 14b of the blade 10 to the outside. In this case, the upper end P and the lower end P2 of the streamlined member have a structure connected by a clip or a zipper. In addition, the leading edge 14a and trailing edge 14b of the blade 10 have a structure in which a member and a streamlined member covering the blade 10 are fixed.

The prior art as described above has a problem in that it takes a lot of time and cost to install the air resistance reduction device because it uses a plurality of straps or a method of connecting a streamlined member using a clip or a zipper.

In addition, according to one embodiment of the prior art during the fatigue test the air flow is introduced between the streamlined member near the edge (edge) of the blade with the highest gas velocity, the air resistance is increased, which causes the additional structure is easily damaged There is a problem.

[Contents of the Invention]

[Technical problem]

The woodworking of the present invention is to solve the problems of the prior art as described above, and more specifically, having an air resistance reduction means on the outside of the blade, and having a support portion between the air resistance reduction means and the blade. By maintaining the air resistance reducing means in a constant shape, it is possible to reduce the air resistance generated in the vertically acting blade. The present invention provides a device for reducing air resistance for fatigue testing of a blade.

Another object of the present invention is to provide an air resistance reduction device for fatigue testing of blades and an installation method using the same, which are applicable to blades of various shapes and sizes, to facilitate installation, and to improve durability.

The present invention and another object of the present invention is to provide an air resistance reduction device for a wave test of the blade and the installation method using the same to form a large number of humps on the outer surface of the air resistance reduction means to maximize the reduction effect.

Technical Solution-In order to achieve the above object, the present invention provides a

<20> Air resistance reduction means that has a cross-sectional shape of a closed loop (closed-loop) to accommodate the wind blade therein, and to maintain a state spaced apart from both sides of the wind blade to reduce the air resistance caused by fatigue test is provided by the ¾Ύ Γ surface ¥ fatigue of the blade is provided with the support portion to form a filling space therein for testing air resistance reducing device-containing, and the air resistance is reduced the number of stages of ^ ¥ ^⁷ T ¥ 7T ⁷ if ¾ stroke ^yo times .

In addition, the air resistance reduction means for reducing the air resistance generated during the fatigue test by receiving a wind blade inside the closed loop formed in the cross-sectional shape, while maintaining a state spaced apart from both sides of the wind blade, and the air Located in the resistance reducing means provides a blade air resistance reduction device for fatigue testing, characterized in that it comprises a support having a curved shape so that a part of the outer shape of the air resistance reduction means to form a curved surface.

<22>

On the other hand, the present invention as another category,

A preparation step of preparing an air resistance reduction means having a cross-sectional shape of a closed tuft so as to accommodate the wind blade therein and having a support portion having a filling space therein; An installation step of installing the air resistance reduction means on an outer surface of the wind blade, a pair of curved portions having a curved surface and spaced apart from both sides of the blade by filling a fluid including gas into the filling space, and the pair of curved surfaces Installation of an air resistance reduction device for fatigue testing of a blade consisting of a completion step of forming a flat portion having a plane between the portions. Provide a method.

In addition, the air resistance reducing means is formed in a closed loop cross-sectional shape to accommodate the wind blade therein and is kept spaced apart from both sides of the wind blade; A preparatory step of preparing a support having a curved shape located inside the air resistance reducing means to form a curved portion of an outer portion of the air resistance reducing means; An installation step of installing the air resistance reduction means on an outer surface of the wind blade; And a pair of curved portions spaced apart from both sides of the blade, and a flat portion having a flat surface between the pair of curved portions by placing the support portion between the air resistance reducing means and the blade. It provides a method of installing the air resistance reduction device for fatigue testing of the blade, characterized in that made.

Advantageous Effects

26> An air resistance reduction device for fatigue testing of a blade according to the present invention provides an air resistance generated in a blade that behaves vertically by providing a structure in which a wind blade is accommodated in an air resistance reduction means having a cross-sectional shape of a closed loop. In order to reduce the pressure and durability, the durability was improved.

In addition, the present invention provides a relatively simple device having an air resistance reducing means and a supporting portion for forming a filling space to fill gas therein, or a support portion having a curved shape to form a curved portion of the air resistance reducing means. It has a structure. Accordingly, it is easy to apply to blades of various shapes and sizes, there is an advantage that can significantly reduce the manufacturing and installation costs.

[Brief Description of Drawings]

1 is a state diagram showing a streamlined cover structure installed in the wind turbine blade according to the prior art,

2 is a front view schematically showing an air resistance reduction apparatus for fatigue testing of a blade according to the present invention;

3 is a perspective view showing a state of use according to the first embodiment of the air resistance reduction device for fatigue test of the blade according to the present invention,

4 is a longitudinal sectional view showing a state of use according to the second embodiment of the air resistance reduction device for fatigue test of the blade according to the present invention,

5 is a longitudinal cross-sectional view according to the example of Example 1 of the air resistance reduction device for fatigue test of a blade according to the present invention,

6 is a schematic view showing a coupling method of the blade according to the first embodiment of the air resistance reduction device for fatigue testing of the blade according to the present invention,

7 is a process flowchart showing the air resistance reduction device and the installation method for the fatigue test of the blade according to the present invention, 8 is a graph showing an experimental example using an air resistance reduction device for fatigue testing of a blade according to the present invention.

<36> <symbol description>

<37> 10: blade _^

<38> 20 ： Weight

100: air resistance

120: support part

122: injection hole

124 ： Attachment means

<43> 140:

<44> 142 •

<45> 144 ^• ^

<46> 146 ^• ^• Straighten and τ ᅳ i

[Best form for implementation of the invention]

The air resistance reduction device for fatigue testing of a blade according to an embodiment of the present invention includes a closed loop cross-sectional shape to accommodate a wind blade therein, and to maintain a state spaced apart from both sides of the wind blade to generate a fatigue test. And an air resistance reducing means for reducing air resistance, wherein the malleable air resistance reducing means is characterized in that the support portion is formed to form a filling space therein so that a part of the outer shape of the air resistance reducing means has a curved surface.

At this time, the filling space of the support may be filled with a fluid containing gas.

In addition, the air drop reduction device for fatigue testing of the blade according to another embodiment of the present invention, consisting of a cross-sectional shape of the closed loop accommodates the wind blades inside, while maintaining a state spaced apart from both sides of the wind blades during the fatigue test Air resistance reducing means for reducing air resistance generated; And a support part positioned inside the air resistance reducing means and having a curved shape so that a part of the outer shape of the air resistance reducing means forms a curved surface. ^■

At this time, the support portion preferably has a width narrower than the width of the blade. And, the support is preferably made of a foam material such as styrofoam.

In addition, in the air resistance reduction device for fatigue test of the blade according to the invention, the air resistance reduction means is spaced apart from both sides of the blade and has a curved surface. Is configured to include a pair of curved portions, and a flat portion having a plane between the pair of curved portions.

At this time, the outer surface of the air resistance reducing means may be formed with a plurality of grooves for lowering the air resistance.

In addition, one side of the support portion may be further provided with attachment means for maintaining a state attached to at least one of the blade and the air resistance reduction means.

In addition, the air resistance reduction device according to the present invention is formed with a height larger than the width.

At this time, the height is preferably greater than 1 to 5 times greater than the width.

<55>

The installation method of the air resistance reduction device for fatigue testing of a blade according to an embodiment of the present invention comprises air in a cross-sectional shape of a closed loop to accommodate a wind blade therein and having a support portion having a filling space therein. A preparation step of preparing a resistance reduction means; An installation step of installing the air resistance reduction means on an outer surface of the wind blade; And filling a fluid containing gas into the filling space to form a pair of curved portions spaced apart from both sides of the blade and having a curved surface, and a planar portion having a flat surface between the pair of curved portions. It features.

In addition, the installation method of the air resistance reduction device for fatigue testing of the blade according to another embodiment of the present invention, made of a cross-sectional shape of the closed loop to accommodate the wind blade therein and spaced apart from both sides of the blade A preparation step of preparing a support having a curved shape so as to maintain an air resistance reduction means and a portion of the outer resistance of the air resistance reduction means formed inside the air resistance reduction means; An installation step of installing the air resistance reduction means on an outer surface of the wind blade; And a pair of curved portions and a curved portion spaced apart from both sides of the blade by positioning the support portion between the air resistance reducing means and the blade, and forming a flat portion having a plane between the pair of curved portions. .

At this time, the completion step may be achieved by standing the support portion between the air resistance reduction means and the blade.

In addition, in the installation method of the air resistance reduction device for fatigue testing of the blade according to the present invention, the installation step is that any one of the air resistance reduction means and the blade and the support portion is attached by the attachment means. desirable.

[Form for implementation of invention]

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is decided.

Prior to the description, the terms or words used in this specification and claims should not be construed in the ordinary, dictionary sense, and the inventors will appropriately define the concept of terms in order to best describe their inventions as best practices. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention. It is to be understood that there can be various fluctuations and variations.

<63>

Figure 2 is a front view schematically showing an air resistance reduction device for fatigue test of the blade according to the present invention. As shown in FIG. 2, the air resistance reduction device 100 for fatigue testing of a blade according to the present invention is fixed in contact with only the outside of the blade 10 at the outside of the blade 10 such that the blade 10 is fixed. This is to reduce the aerodynamic damping that occurs when resonating in the vertical direction.

To this end, the air resistance reduction apparatus 100 is formed to have a rounded outer surface in the upper and lower directions of the blade 10.

That is, the air resistance reduction device 100 is formed to round the outer surface of the upper and lower in order to reduce the air resistance generated in the blade 10 resonating in the vertical direction. The front and rear ends of the air resistance reduction device 100 are formed to surround the widthwise edges of the blade 10.

A weight 20 may be located at the right end of the air resistance reduction apparatus 100. Since the blade 10 has a general configuration that may be provided in various shapes, sizes, and positions, detailed description thereof will be omitted. do.

<68>,

A configuration according to various embodiments of the air resistance reduction device 100 described above will be described with reference to FIGS. 3 and 4.

3 is a perspective view showing a state of use according to the first embodiment of the air resistance reduction device for fatigue test of the blade according to the present invention, Figure 4 is a second view of the air resistance reduction device for fatigue test of the blade according to the present invention It is a longitudinal cross-sectional view which shows the use condition according to the Example.

3 and 4, the air resistance reduction apparatus 100 according to the present invention is a closed loop. It has a cross-sectional shape to accommodate the wind blade 10 therein, and to maintain the state spaced apart from both sides of the wind blade (10) includes an air resistance reduction means 140 for reducing the air resistance generated during the fatigue test And, the air resistance reducing means 140 is provided with a support 120 that can be variously changed.

<72>

On the other hand, the air resistance reducing means 140 is a groove for reducing the air resistance on the outer surface

A large number 142 is formed. The groove 142 uses the principle that the drag coefficient caused by air is reduced by about one third by changing the fluid around the golf ball into turbulence by the groove formed on the outer surface of the golf ball. According to the present embodiments, a plurality of grooves 142 are formed on the entire outer surface of the air resistance reduction means 140.

Then, the air resistance reducing means 140 is configured to maintain a constant appearance in a state in which the expansion range is limited when inflated or unfolded by the support 120. Therefore, the air resistance reduction means 140 may be formed of various materials such as a polymer film, a rubber film, and a fiber film.

The air resistance reducing means 140 is located outside the support part 120 to limit the movement of the support part 120 from the blade 10, which is the part where air resistance actually occurs.

In the air resistance reduction means 140 according to the present invention, a curved portion 144 is formed at an upper portion and a lower portion thereof, and a flat portion 146 is provided between the curved portions 144.

<77>

On the other hand, the present invention is provided with an attachment means 124 on any one side of the air resistance reduction means 140, the blade 10 and the support portion 120. The attachment means 124 is configured to restrain the blade 10, the air resistance reducing means 140, and the support 120 to maintain an integrated state when the blade 10 generates an amplitude in the vertical direction.

Referring to Figure 3 according to the first embodiment of the present invention, the attachment means 124 is a blade

It is provided between the 10 and the support 120 to fix the blade 10 and the support 120 so as not to be spaced apart, the support 120 generates pressure in the outward direction to reduce the air resistance reduction means 140 It has a configuration that is integrated by expanding.

And, referring to Figure 4 according to a second embodiment of the present invention, the attachment means 124 is provided between the blade 10 and the support 120 similar to Figure 3 and the blade 10 and The support 120 may be fixed so as not to be spaced apart, and the support 120 may be forced to maintain the upright state with respect to the blade 10. In this case, the above-described attachment means 124 may be applied by adopting any one or more of velcro, tape, adhesive, and is attached separately to the contact portion of the support portion 120 and the air resistance reduction means 140. Of course, the means may be further provided.

<82>

On the other hand, the support portion 120 according to the present invention is the air resistance reduction means 140 is curved portion

144 and the flat portion 146 can be formed in various ways within a range that does not deform the shape by the air resistance.

For example, as shown in FIG. 3 showing the first embodiment, the support part 120 is long in the left and right direction for weight reduction and has a tube shape in which left and right ends are shielded. Such a support 120 may be configured to expand round to the top or bottom to form a curved surface in contact with the upper and lower surfaces of the blade 10, respectively.

In this case, the support 120 may be formed of various materials as long as the support 120 may selectively discharge and inflow of gas, and may have elasticity and leak of gas does not occur. For example, the support 120 may employ silicone rubber, butyl rubber, fiber bag, or the like. In addition, the type of gas filled in the support 120 may be selected in various ways, preferably, a gas lighter than air, such as helium.

And, one side of the support portion 120 is provided with an injection hole 122 to enable the filling or exhaust of gas. In the first embodiment of the present invention, since the support 120 is separately provided on the upper and lower sides of the blade 10, it is preferable that one injection hole 122 is provided for each support 120.

In addition, the support unit 120 according to the embodiment of the present invention serves to support the blade 10 when the air resistance is generated on the outer surface of the air resistance reduction means 140 due to the amplitude in the vertical direction. The rounded shape of the actual air resistance reducing means 140 is determined by the surface in contact with the support 120. Therefore, the outer surface of the support portion 120 is rounded so that the air resistance can be reduced by contacting the inner surface of the air resistance reduction means 140.

Then, the support 120 according to the first embodiment is formed to have a width narrower than the width of the blade (10). Accordingly, the side surface of the support 120 maintains a state spaced apart from the air resistance reducing means 140 as shown in FIGS. 3 and 5.

<89>

In the air resistance reduction device 100 according to the present invention, the overall height b determined by the height of the support part 120 is a width a length in order to reduce air resistance. It is preferable to form larger.

Specifically, according to the present embodiment, it is preferable that the height (b) is formed to be larger than the width (a) by more than 1 to 5 times.

<92>

4 shows a second embodiment of the support 120. The support 120 may be in the form of a structure having a predetermined shape and having a predetermined strength. At this time, the support portion 120 may be manufactured in a form filled inside by using a foam material such as styrofoam to reduce the weight.

The support portion 120 is formed so that the portion in contact with the blade 10 has a shape that is opposed to the outer surface of the blade 10, the portion in contact with the inner surface of the air resistance reduction means 140 is a curved portion ( It is preferable to be formed so as to have a valley to the 144.

Then, the support 120 has a height comparable with the height of the flat portion 146.

<96>

The air resistance reduction means 140 described above with reference to FIGS. 3 and 7 attached below.

An installation method according to an embodiment will be described.

The installation method of the air resistance reduction device for fatigue testing of a blade according to the present invention is made of a cross-sectional shape of a closed loop to accommodate a wind blade therein, and has a support having a layered space in which fluid can be filled _. Preparing step (S100) for preparing an air resistance reduction means 140 having a portion; An installation step of installing the air magnetic path reducing means 140 on the outer surface of the wind blade 10 (S200); And a pair of curved portions 144 spaced apart from both sides of the blade 10 and having a curved surface by filling a fluid including a gas into the filling space of the support 120, and the pair of curved portions 144. Completion step (S300) of forming a planar portion 146 having a plane therebetween.

When the support unit 120 having a structure in which gas is injected and expanded as shown in FIG. 3 is installed, an installation step S200 as illustrated in FIG. 6 is performed.

As shown in FIG. 6, the support 120 is spaced apart from the inside of the air resistance reduction means 140, and then the blade 10 is inserted between the pair of the support 120 (S200). At this time, between the air resistance reducing means 140 and the support portion 120 is provided with an attachment member 124 of the adhesive member or Velcro tape, so that the support portion 120 and the air resistance reduction means 140 are not separated from each other. You can limit it.

<101>

After the installation step (S200) described above, by injecting gas through the injection hole 122 When the support 120 is expanded to form the curved portion 144 and the flat portion 146, the completion step S300 is completed.

<103>

Hereinafter, an installation method according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 7.

In the installation method according to the second embodiment of the present invention, the air resistance reduction means is formed in a closed loop cross-sectional shape so as to accommodate the wind blade therein and is spaced apart from both surfaces of the blade 10. A preparation step (S100) positioned in the air resistance reducing means 140 to prepare a support 120 having a curved shape such that a portion of the outer resistance of the air resistance reducing means 140 forms a curved surface; An installation step of installing the air resistance reduction means on the outer surface of the wind blade (S200); And a pair of curved portions 144 spaced apart from both sides of the blade 10 by positioning the support 120 between the air resistance reducing means 140 and the blade 10, and the pair of curved surfaces. Completion step (S300) to form a planar portion 146 having a plane between the portions 144.

That is, in the preparation step (S100) it may be provided with a support 120 of the structure form as shown in FIG.

<107>

When the support 120 is implemented in the form of a structure as shown in FIG. 4, after the support 120 is inserted between the blade 10 and the air resistance reducing member 140 (installation step (S200)). The completion step (S300) is completed by lifting the support part 120 to stand up against the outer surface of the blade 10.

Then, in the completion step (S300) it may be limited to the movement by having the attachment means 124 in the portion where the blade 10 and the support portion 120 in contact.

<110>

<in> Air resistance reduction device installed according to the first and second embodiments as described above

100, the overall height (b) is formed larger than the width (a) based on the longitudinal cross-sectional shape of the outer surface of the air resistance reduction means 140 as shown in FIG. According to this embodiment, it is preferable that the ratio of the width (b) to the height (b) is in the range of 1 to 5.

<112>

<113> (experimental example)

8 is a graph showing an experimental example using an air resistance reduction device for fatigue test of a blade according to the present invention. The experimental example of the graph of FIG. 8 compares the damping ratio and the oscillating amplitude of the blade with and without the air resistance reduction device according to the present invention. . At this time, the graph and the horizontal axis represent the distance from the blade's root, and the vertical axis represents the moment ratio (¾) with respect to the target moment (Target moment).

On the other hand, the overall shape of the air resistance reduction device according to the present invention used in the present experimental example was carried out with the ratio of height to width of 1: 2 :.

<117>

According to the experimental results shown in FIG. 8, when the air resistance reduction device is mounted, the air resistance decreases by about 23% and the amplitude of the blade increases by about 23% than when it is not.

In addition, the test cycle required is 8X10 ⁶ because the air resistance is large and the blade amplitude is small when the air resistance reducing device is not installed, and IX 10 ⁶ when the air resistance reducing device is installed. It can be seen that the efficiency is eight times lower.

In other words, the air resistance reduction device according to the present invention has the effect of significantly reducing the air resistance, thereby significantly reducing the number of test cycles and the resulting test cost in the blade fatigue test.

<121>

As described above, although the present invention has been described by means of a limited embodiment and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Various modifications and variations are possible without departing from the spirit and scope of the appended claims.

Claims

[Range of request]

[Claim 1]

In the air resistance reduction device installed on the outer surface of the blade to reduce the air resistance generated during the fatigue test of the wind blade,

Containing a cross-sectional shape of the closed loop accommodates the wind blade therein, and includes an air resistance reduction means for reducing the air resistance generated during the fatigue test by maintaining a state spaced apart from both sides of the wind blade,

The air resistance reduction means is the air resistance reduction device for the fatigue test of the blade, characterized in that the support portion for forming a laminar space therein so that the outer portion of the air resistance reduction means to form a curved surface.

[Claim 2]

According to claim 1,

Filling space of the support portion air resistance reduction device for fatigue testing of the blade, characterized in that the fluid containing gas is filled.

[Claim 3]

In the air resistance reduction device installed on the outer surface of the blade in order to reduce the air resistance generated during wind turbine blade test,

An air resistance reduction means configured to have a cross-sectional shape of a closed loop and accommodate a wind blade therein, and to maintain a state spaced apart from both sides of the blade to reduce air resistance generated during a fatigue test; And

Located in the air resistance reduction means and comprises a support having a curved shape so that the outer portion of the air resistance reduction means to form a curved air resistance reduction device for blade fatigue characterized in that it comprises a.

【Claim ⁴ 】

The method of claim 3,

The support unit for reducing the air resistance of the blade, characterized in that the blade has a width narrower than the width of the blade.

[Claim 5]

According to claim 3,

The support portion air resistance reduction device for fatigue testing of the blade, characterized in that made of a foam material such as styrofoam.

[Claim 6] The method according to claim 1 or 3,

The air resistance reduction means,

And a pair of curved portions having a curved surface and spaced apart from both surfaces of the blade, and a plane portion having a flat surface between the pair of curved portions.

[Claim 7]

The method of claim 6,

An air resistance reduction device for fatigue testing of a blade, characterized in that a plurality of grooves are formed on the outer surface of the air resistance reduction means to reduce air resistance.

[Claim 8]

The method of claim 1 or 3,

One side of the support portion is characterized in that the blade and the air resistance reduction device for fatigue test further characterized in that the attachment means for maintaining an attached state with at least one of the air resistance reduction means.

[Claim 9]

The method according to claim 1 or 3,

The air resistance reduction device for the fatigue test of the Buley H, characterized in that the height is larger than the width. ·

[Claim 10],

The method of claim 9,

The air resistance reduction device for fatigue testing of the blade, characterized in that the height is greater than 1 times to 5 times less than the width.

[Claim 11]

A preparation step is made of a cross-sectional shape of a closed loop (Closed-loop) to accommodate the wind blades therein, the preparation step of preparing an air resistance reduction means having a support having a filling space therein;

An installation step of installing the air resistance reduction means on an outer surface of the wind blade; And filling a fluid including gas into the filling space to form a pair of curved portions spaced from both sides of the blade and having a curved surface, and a planar portion having a flat surface between the pair of curved portions. A method of installing an air resistance reduction device for fatigue testing of a blade.

[Claim 12] To receive a wind blade therein made of a cross-sectional shape of a closed loop (Closed-loop) and the air resistance reducing means for holding the both surfaces and the spaced state of the blade, commercial air resistance reducing ^means, located inside the air jjeohang A preparation step of preparing a support having a curved shape such that an external portion of the abatement means forms a curved surface;

An installation step of installing the air resistance reduction means on an outer surface of the wind blade; And a completion step of placing the support portion between the air resistance reduction means and the blade to form a pair of curved portions spaced apart from both sides of the blade, and a flat portion having a plane between the pair of curved portions. Installation method of the air resistance reduction device for fatigue testing of the blade, characterized in that.

[Claim 13]

The method of claim 12,

The completion step is the installation method of the air resistance reduction device for fatigue testing of the blade, characterized in that made by standing the supporting portion between the air resistance reduction means and the blade.

[Claim 14]

The method according to claim 11 or 12,

Wherein the installation step of any one of the air resistance reduction means and the blade and the support portion is attached to each other by the attachment means, the installation method of the air resistance reduction device for the fatigue test of the blade.