U.S. patent application number 14/007314 was filed with the patent office on 2014-01-16 for corrugated panel for wind power generator blade.
This patent application is currently assigned to SAMSUNG HEAVY IND. CO., LTD.. The applicant listed for this patent is Kihyun Kim, Jeongsang Lee, Eun Jung Oh. Invention is credited to Kihyun Kim, Jeongsang Lee, Eun Jung Oh.
Application Number | 20140017088 14/007314 |
Document ID | / |
Family ID | 46931685 |
Filed Date | 2014-01-16 |
United States Patent
Application |
20140017088 |
Kind Code |
A1 |
Kim; Kihyun ; et
al. |
January 16, 2014 |
CORRUGATED PANEL FOR WIND POWER GENERATOR BLADE
Abstract
A corrugated panel for a wind power generator blade is provided.
The corrugated panel for a wind power generator blade includes: a
plurality of wrinkles that are coupled to one surface or the other
surface of the wind power generator blade having an airfoil
transverse section and that are formed in a length direction of the
blade, wherein a gap and a height at a predetermined position of
the plurality of wrinkles each have a value of a predetermined
ratio to a chord length of the airfoil transverse section of the
blade at the predetermined position, when the plurality of wrinkles
are coupled to the blade.
Inventors: |
Kim; Kihyun; (Daejeon,
KR) ; Lee; Jeongsang; (Geoje-si, KR) ; Oh; Eun
Jung; (Bucheon-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kim; Kihyun
Lee; Jeongsang
Oh; Eun Jung |
Daejeon
Geoje-si
Bucheon-si |
|
KR
KR
KR |
|
|
Assignee: |
SAMSUNG HEAVY IND. CO.,
LTD.
Seoul
KR
|
Family ID: |
46931685 |
Appl. No.: |
14/007314 |
Filed: |
January 6, 2012 |
PCT Filed: |
January 6, 2012 |
PCT NO: |
PCT/KR2012/000164 |
371 Date: |
September 24, 2013 |
Current U.S.
Class: |
416/236R |
Current CPC
Class: |
F01D 5/145 20130101;
F03D 1/0675 20130101; F03D 1/0683 20130101; Y02E 10/72 20130101;
F05B 2230/23 20130101; F05B 2250/183 20130101; F05B 2240/32
20130101; Y02P 70/50 20151101 |
Class at
Publication: |
416/236.R |
International
Class: |
F01D 5/14 20060101
F01D005/14 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 31, 2011 |
KR |
10-2011-0029521 |
Claims
1. A corrugated panel for a wind power generator blade, the
corrugated panel comprising: a plurality of wrinkles that are
coupled to one surface or the other surface of the wind power
generator blade having an airfoil transverse section and that are
formed in a length direction of the blade, wherein a gap and a
height at a predetermined position of the plurality of wrinkles
each have a value of a predetermined ratio to a chord length of the
airfoil transverse section of the blade at the predetermined
position, when the plurality of wrinkles are coupled to the
blade.
2. The corrugated panel of claim 1, wherein the corrugated panel
covers an entire width of one surface of the blade from one end
portion to the other end portion of the blade and is coupled to the
entire width of one surface of the blade.
3. The corrugated panel of claim 1, wherein the corrugated panel is
made of a material comprising one of a titanium alloy, an aluminum
alloy, and a synthetic resin.
4. A corrugated panel for a wind power generator blade, the
corrugated panel comprising: a panel body having one surface that
is coupled to one surface or the other surface of the wind power
generator blade having an airfoil transverse section; and a wrinkle
portion that has a plurality of wrinkles in a length direction of
the blade at the other surface of the panel body, wherein a gap and
a height at a predetermined position of the plurality of wrinkles
each have a value of a predetermined ratio to a chord length of an
airfoil transverse section of the blade at the predetermined
position, when the panel body is coupled to the blade.
5. The corrugated panel of claim 4, wherein the panel body covers
an entire width of one surface of the blade from one end portion to
the other end portion of the blade and is coupled to the entire
width of the one surface of the blade.
6. The corrugated panel of claim 4, wherein the transverse section
of the wrinkle has one shape of a polygon, a semicircle, and an
oval.
7. The corrugated panel of claim 6, wherein the wrinkle has a
transverse section of a triangle shape.
8. The corrugated panel of claim 4, wherein the predetermined ratio
is 0.1 to 5%.
9. The corrugated panel of claim 4, wherein the panel body and the
wrinkle portion are made of a material comprising one of a titanium
alloy, an aluminum alloy, and a synthetic resin.
10. The corrugated panel of claim 4, wherein the panel body
comprises a foldable connection portion that is positioned between
the wrinkles.
11. The corrugated panel of claim 1, wherein the transverse section
of the wrinkle has one shape of a polygon, a semicircle, and an
oval.
12. The corrugated panel of claim 11, wherein the wrinkle has a
transverse section of a triangle shape.
13. The corrugated panel of claim 1, wherein the predetermined
ratio is 0.1 to 5%.
Description
TECHNICAL FIELD
[0001] The present invention relates to a corrugated panel for a
wind power generator blade. More particularly, the present
invention relates to a corrugated panel that is coupled to a wind
power generator blade in order to improve an aerodynamic
performance of the wind power generator blade.
BACKGROUND ART
Disclosure
[0002] Wind force power generation is a clean energy source that
hardly causes environment contamination as a promising replacement
energy source that can replace fossil fuel. It is known that in
replacement energy sources by present technology, wind force power
generation has highest economic efficiency. Therefore, research and
development for a wind power generator has been actively performed,
and an example of installing wind power generators in a region
having an abundant wind amount increases.
[0003] In general, the wind power generator includes a rotor in
which a plurality of blades are coupled to a hub to rotate by a
wind force and a generator that receives a torque from a main shaft
that is connected to the rotor and that converts the torque to
electrical energy.
[0004] FIG. 1 is a diagram illustrating a horizontal axis type wind
power generator.
[0005] Referring to FIG. 1, a wind power generator 100 includes a
tower 110, a neosel 120, a hub 130, and a blade 140.
[0006] The rotor includes the hub 130 and a plurality of blades 140
that are coupled to the hub 130. The hub 130 is connected to a
generator (not shown) that is installed within the neosel 120 by a
main shaft (not shown).
[0007] The pillar-shaped tower 110 is installed at a ground 1, and
the neosel 120 is supported by the tower 110. In this case, the
neosel 120 is generally rotatably coupled to an upper end portion
of the tower 110 about a length direction of the tower 110 to
rotate a rotor in a windward direction.
[0008] Therefore, at a region in which the wind power generator 100
is installed, when a wind blows, if the hub 130 rotates the neosel
120 in a windward direction, a force by a wind is applied to the
blade 140 and thus the hub 130 rotates, and a torque of the hub 130
is transferred to a generator (not shown) through a main shaft (not
shown) to be converted to electrical energy.
[0009] In this case, in order to improve power generation
efficiency of the wind power generator 100, it is necessary to
increase efficiency in which the blade 140 converts a force that is
applied by a wind to a torque. Therefore, in order to enable the
blade 140 to have a shape that can obtain highest efficiency from
an aerodynamic viewpoint, research and development for a shape of
the blade 140 has been continuously performed.
[0010] FIG. 2 is a diagram illustrating a section of a blade taken
along line II-II of FIG. 1.
[0011] Referring to FIG. 2, the blade 140 includes a suction side
141 and a pressure side 142.
[0012] Here, a shape of the suction side 141 and the pressure side
142 is formed so that a section of the blade 140 may have a shape
of an airfoil such as a blade of an aircraft and as described
above, this is to increase efficiency in which the blade 140
converts a force of a wind to a torque.
[0013] At a section of the blade 140 having a shape of an airfoil,
a leading edge, 143, a trailing edge 144, a chord 145, a mean
camber line 146, and a chord length LC are represented, and this is
well known to a person of an ordinary skill in the art and
therefore a detailed description thereof will be omitted.
[0014] Referring again to FIG. 1, power P that is generated by the
wind power generator 100 is represented by Equation 1.
P = 1 2 .rho. V 3 AC P [ Equation 1 ] ##EQU00001##
where P is power, .rho. is an air density, V is a wind velocity, CP
is a coefficient of power, and A is a swept area of the blade
140.
[0015] The air density .rho. and the wind velocity V are different
according to an installed location of the wind power generator 100,
but cannot be arbitrarily adjusted. Therefore, in order to increase
power P that is generated by the wind power generator 100, a method
of increasing a swept area of blade A or a method of increasing a
coefficient of power Cp is considered.
[0016] In order to increase the swept area of blade A, a length of
the blade 140 should be extended, but as a length of the blade 140
is extended, a cost and a time that are consumed for production of
the blade 140 increase, and due to increase of a linear velocity of
a tip portion of the blade 140, a problem that noise and a
vibration increase occurs. Therefore, a limitation exists in
extending a length of the blade 140.
[0017] Therefore, when designing the blade 140, by increasing a
coefficient of power Cp to the maximum, power P that is generated
by the wind power generator 100 may be increased.
[0018] The above information disclosed in this Background section
is only for enhancement of understanding of the background of the
invention and therefore it may contain information that does not
form the prior art that is already known in this country to a
person of ordinary skill in the art.
Technical Problem
[0019] The present invention has been made in an effort to provide
a corrugated panel for a wind power generator blade having
advantages of improving power generation efficiency of a wind power
generator by improving aerodynamic characteristics of the wind
power generator blade.
Technical Solution
[0020] An exemplary embodiment of the present invention provides a
corrugated panel for a wind power generator blade including: a
plurality of wrinkles that are coupled to one surface or the other
surface of the wind power generator blade having an airfoil
transverse section and that are formed in a length direction of the
blade, wherein a gap and a height at a predetermined position of
the plurality of wrinkles each have a value of a predetermined
ratio to a chord length of the airfoil transverse section of the
blade at the predetermined position, when the plurality of wrinkles
are coupled to the blade.
[0021] The corrugated panel for a wind power generator blade may
cover an entire width of one surface of the blade from one end
portion to the other end portion of the blade and may be coupled to
the entire width of one surface of the blade.
[0022] The corrugated panel may be made of a material including one
of a titanium alloy, an aluminum alloy, and a synthetic resin.
[0023] Another embodiment of the present invention provides a
corrugated panel for a wind power generator blade, the corrugated
panel including: a panel body having one surface that is coupled to
one surface or the other surface of the wind power generator blade
having an airfoil transverse section; a wrinkle portion that has a
plurality of wrinkles in a length direction of the blade at the
other surface of the panel body, wherein a gap and a height at a
predetermined position of the plurality of wrinkles each have a
value of a predetermined ratio to a chord length of an airfoil
transverse section of the blade at the predetermined position, when
the panel body is coupled to the blade.
[0024] The panel body may cover an entire width of one surface of
the blade from one end portion to the other end portion of the
blade and may be coupled to the entire width of the one surface of
the blade.
[0025] The panel body and the wrinkle portion may be made of a
material including one of a titanium alloy, an aluminum alloy, and
a synthetic resin.
[0026] The transverse section of the wrinkle may have one shape of
a polygon, a semicircle, and an oval, and particularly, the
transverse section of the wrinkle may have a transverse section of
a triangle shape.
[0027] The predetermined ratio may be 0.1 to 5%.
[0028] The panel body may include a foldable connection portion
that is positioned between the wrinkles.
Advantageous Effects
[0029] According to an exemplary embodiment of the present
invention, by improving aerodynamic characteristics of a newly
produced wind power generator blade and a blade that has already
been installed in the wind power generator and that uses for the
wind power generator, power generation efficiency of the wind power
generator can be improved.
DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 is a diagram illustrating a general wind power
generator.
[0031] FIG. 2 is a diagram illustrating a section of a blade taken
along line II-II of FIG. 1.
[0032] FIG. 3 is a perspective view illustrating a process of
coupling a corrugated panel for a wind power generator blade to the
blade according to an exemplary embodiment of the present
invention.
[0033] FIGS. 4 and 5 are graphs illustrating a difference of lift
force generation according to an airfoil shape.
[0034] FIG. 6 is a diagram illustrating an experimental result
illustrating a corrugated panel representing an airfoil effect.
[0035] FIG. 7 is a diagram illustrating a section taken along line
VII-VII of FIG. 3.
[0036] FIG. 8 is a diagram illustrating a section of a corrugated
panel for a wind power generator blade that is coupled to a blade
according to an exemplary embodiment of the present invention.
[0037] FIG. 9 is a diagram illustrating a section of a corrugated
panel for a wind power generator blade according to another
exemplary embodiment of the present invention.
MODE FOR INVENTION
[0038] As those skilled in the art would realize, the described
embodiments may be modified in various different ways, all without
departing from the spirit or scope of the present invention. It is
to be understood that the invention is not limited to the disclosed
embodiments, but, on the contrary, is intended to cover various
modifications and equivalent arrangements included within the
spirit and scope of the appended claims. Further, detailed
descriptions of well-known functions and structures incorporated
herein may be omitted to avoid obscuring the subject matter of the
present invention.
[0039] Hereinafter, an exemplary embodiment of the present
invention will be described in detail with reference to the
accompanying drawings.
[0040] FIG. 3 is a perspective view illustrating a process of
coupling a corrugated panel for a wind power generator blade to the
blade according to an exemplary embodiment of the present
invention.
[0041] Referring to FIG. 3, a corrugated panel 200 for a wind power
generator blade according to an exemplary embodiment of the present
invention is coupled to one surface, i.e., a suction side 141 of a
blade 140. Here, the corrugated panel 200 for the wind power
generator blade according to an exemplary embodiment of the present
invention may be coupled to the other surface of the blade 140,
i.e., a pressure side (see 142 of FIG. 7), as needed.
[0042] As described above, a section of the blade 140 of the wind
power generator (see 100 of FIG. 1) has an airfoil shape. This will
be described with reference to FIGS. 4 and 5.
[0043] FIGS. 4 and 5 each are graphs illustrating a difference of
lift force generation according to an airfoil shape. This will be
described with reference to FIGS. 4 and 5.
[0044] First, FIG. 4 illustrates a comparison graph of shapes of an
NACA 0012 type airfoil and an NACA 4412 type airfoil. Here, NACA
means the National Advisory Committee on Aeronautics, which is the
predecessor of U.S. National Aeronautics and Space Administration
(NASA).
[0045] The NACA 0012 type airfoil is a symmetrical airfoil and has
a not-shown chord, i.e., a symmetrical shape about a portion
between 0 and 1 in a horizontal axis of a graph. The NACA 4412 type
airfoil is an asymmetrical airfoil and has an asymmetrical shape
about a portion between 0 and 1 in a horizontal axis of a
graph.
[0046] That is, although not shown, in the NACA 0012 type airfoil,
the mean camber line (see 146 of FIG. 2) corresponds to the chord
(see 145 of FIG. 2), and in the NACA 4412 type airfoil, the mean
camber line (see 146 of FIG. 2) does not correspond to the chord
(see 145 of FIG. 2) and may be formed in a direction in which an
outer edge line is leaned, i.e., at a position that is leaned to
the upper side further than a horizontal axis of a graph. In other
words, in the NACA 4412 type airfoil, which is an asymmetrical
airfoil, a camber is formed.
[0047] FIG. 5 is a graph of an experimental result illustrating a
change of a lift coefficient according to an angle of attack of the
NACA 0012 type airfoil and the NACA 4412 type airfoil. Here, an
angle of attack indicates an angle that is formed by the chord (145
of FIG. 2) of the blade (140 of FIG. 1) having an airfoil section
and a direction of a wind, and this is well known to a person of an
ordinary skill in the art and therefore a detailed description
thereof will be omitted.
[0048] As shown in the drawing, it can be seen that a lift
coefficient of the NACA 4412 type airfoil is always larger than
that of the NACA 0012 type airfoil regardless of a change of an
angle of attack within a predetermined range. Therefore, it is
determined that a lift that is generated by the NACA 4412 type
airfoil in which a camber is formed largely than a lift that is
generated by the NACA 0012 type airfoil within a predetermined
angle range.
[0049] For reference, a lift operating in the airfoil is
represented by Equation 2.
L = 1 2 .rho. V 2 AC L [ Equation 2 ] ##EQU00002##
where L is a lift, .rho. is an air density, V is a wind velocity,
CL is a coefficient of lift, and A is a swept area of the blade
(140 of FIG. 1). The coefficient of lift is an experimental value
that related to a shape or an angle of attack of the airfoil and
thus may be obtained by directly measuring or with reference to a
data book.
[0050] In order to increase efficiency that converts a force
operating by a wind to a torque, a section of the blade (140 of
FIG. 1) of the wind power generator (100 of FIG. 1) is designed to
have a shape that can use a lift L operating in the blade (140 of
FIG. 1) to the maximum.
[0051] Actually, the blade (140 of FIG. 1) of a general horizontal
axis wind power generator (100 of FIG. 1) is designed to have a
shape of an asymmetrical airfoil in which a camber is formed.
[0052] Here, as a lift operating in the blade (140 of FIG. 1)
increases, a force of a direction that rotates a main shaft (not
shown) that is connected to the hub (130 of FIG. 1) increases. When
a force that rotates the main shaft (not shown) increases, power P
that is generated by the wind power generator (100 of FIG. 1)
increases and thus a coefficient of power (CP) increases.
[0053] Therefore, as an airfoil section shape of the blade (140 of
FIG. 1) has a shape in which a CL increases, i.e., a shape in which
a camber of an airfoil section increases, a CP increases and thus
generation efficiency of the wind power generator (100 of FIG. 1)
can be improved.
[0054] FIG. 6 is a diagram illustrating an experimental result for
explaining a corrugated panel representing an airfoil effect.
[0055] FIG. 6 illustrates a shape when a corrugated panel 20 is
positioned at an air current flowing parallel to an X-axis
direction. Here, in the corrugated panel 20, a plurality of
wrinkles Ra, Rb, Rc, Rd, Re, Rf, Rg, Rh, Ri, Rj, Rk, and Rl
(hereinafter, referred to as `Ra to Rl`) are formed, and although
not shown, when it is assumed that vertexes of a plurality of
wrinkles Ra to Rl are connected by a virtual line, the virtual line
has an airfoil.
[0056] As described above, when the corrugated panel 20 is
positioned at an air current, vortexes Va, Vb, Vc, Vd, Ve, Vf, Vg,
Vh, Vi, and Vj (hereinafter, `Va to Vj`) are each formed in a
relatively depressed portion by the plurality of wrinkles Ra to
Rl.
[0057] Here, as shown in the drawing, as vortexes Va to Vj are
continuously formed in space between a plurality of wrinkles Ra to
Rl, a stable laminar flow LS is formed at the outside of the
plurality of wrinkles Ra to Rl.
[0058] Therefore, as shown in the drawing, a section shape of the
corrugated panel 20 is different from that of an airfoil, but
performs the same operation as that of the airfoil, and it is
determined that the same effect as that of forming of a camber is
obtained according to a protrusion level of the plurality of
wrinkles Ra to Rl.
[0059] For reference, an experimental result of operation of the
corrugated panel 20 may be determined in "flow visualization study
of the aerodynamics of modeled dragonfly wings (AIAA-2007-0483)"
that is disclosed at No. 47 (Dec. 12, 2009) of an AIAA journal that
is published by American Institute for Aeronautics and Astronautics
(AIAA) and "an experimental investigation on bio-inspired
corrugated airfoil (AIAA-2009-1087)" that is announced at the 47th
AIAA aerospace sciences meeting including the new horizons forum
and aerospace exposition that was held at Jan. 5 to 8, 2009 at
Orlando, Fla., USA and therefore a detailed description thereof
will be omitted.
[0060] Nowadays, in an aviation field and a shipbuilding field, a
method of delaying separation of a fluid by forming a micro groove
or protrusion, i.e., a dimple or a riblet at a surface in which a
friction with a fluid occurs has continuously been researched,
developed, and applied.
[0061] However, the above-described wrinkles Ra to Rl have a
considerable size, compared with an entire size of the corrugated
panel 20, unlike such a micro groove or protrusion. Further, the
above-described wrinkles Ra to RI are not for delay of separation
and are different from such a micro groove or protrusion in that
the corrugated panel 20 having a section different from that of an
airfoil performs the same operation as that of an airfoil.
[0062] Therefore, as shown in FIG. 3, when the corrugated panel 20
is coupled to one surface (141 of FIG. 3) of the blade (140 of FIG.
3), an effect that increases a camber of an airfoil section of the
blade (140 of FIG. 3) can be obtained, and this will be described
with reference to FIGS. 7 and 8.
[0063] FIG. 7 is a diagram illustrating a section taken along line
VII-VII of FIG. 3, and FIG. 8 is a diagram illustrating a section
of a corrugated panel for a wind power generator blade that is
coupled to the blade according to an exemplary embodiment of the
present invention. This will be described with reference to FIGS. 3
and 7.
[0064] Referring to FIG. 7, in a corrugated panel 200 for a wind
power generator blade according to an exemplary embodiment of the
present invention, in a length direction of the blade 140 in which
the corrugated panel 200 for the wind power generator blade is to
be coupled, a plurality of wrinkles 202 are formed.
[0065] When the corrugated panel 200 for the wind power generator
blade is coupled to one surface of the blade 140, the corrugated
panel 200 for the wind power generator blade covers from one end
portion to the other end portion, i.e., from a root portion to a
tip portion of the blade 140 in a length direction of the blade 140
and is coupled thereto. However, the corrugated panel 200 may cover
only a portion in a length direction of the blade 140 and may be
coupled thereto, as needed.
[0066] Further, when the corrugated panel 200 for the wind power
generator blade is coupled to one surface of the blade 140, the
corrugated panel 200 for the wind power generator blade covers from
the leading edge 143 to the trailing edge 144 in a width direction
of the blade 140 and is coupled thereto. However, the corrugated
panel 200 may cover only a portion in a width direction of the
blade 140 and may be coupled thereto, as needed.
[0067] When the corrugated panel 200 for the wind power generator
blade is coupled to the blade 140, a gap p and a height hr of a
plurality of wrinkles 202 that are formed in the corrugated panel
200 for the wind power generator blade may be each formed to have a
predetermined ratio of value to a chord length LC of a transverse
section of the airfoil of the blade 140 at a predetermined
position.
[0068] Here, the chord length LC of a transverse section of the
airfoil of the blade 140 may be continuously changed from one end
portion to the other end portion in a length direction of the blade
140. Therefore, because a gap p and a height hr of a plurality of
wrinkles 202 may have a predetermined ratio of value to the chord
length LC, a gap p and a height hr of the wrinkles 202 may be each
changed proportional to a chord length LC at a corresponding
position according to a predetermined position according to a
length direction of the blade 140.
[0069] An entire shape of the corrugated panel 200 for the wind
power generator blade may be formed to have the same shape as that
of a surface to which the corrugated panel 200 for the wind power
generator blade is to be attached.
[0070] For example, as shown in the drawing, in the corrugated
panel 200 for the wind power generator blade, a lower boundary line
LL in which a protruded end portion of a plurality of wrinkles 202
that are protruded in a direction to be coupled to the suction side
141 of the blade 140 is virtually connected may be formed to have a
shape of the suction side 141 of the blade 140.
[0071] Further, although not shown, when the corrugated panel 200
for the wind power generator blade according to an exemplary
embodiment of the present invention is coupled to the pressure side
142 of the blade 140, the lower boundary line LL may be formed to
have a shape of the pressure side 142 of the blade 140.
[0072] Referring to FIG. 8, the corrugated panel 200 for the wind
power generator blade according to an exemplary embodiment of the
present invention is coupled to the suction side 141 of the blade
140.
[0073] In this case, the corrugated panel 200 for the wind power
generator blade may be coupled by an adhesive to the blade 140 and
may be coupled using a separate fastening member (not shown) such
as a volt and a nut.
[0074] For reference, when a separate fastening member (not shown)
is used, a through-hole for coupling a fastening member (not shown)
to the blade 140 and the corrugated panel 200 for the wind power
generator blade may be formed, and as a stress is concentrated at
such a through-hole, rigidity of the blade 140 and the corrugated
panel 200 for the wind power generator blade may be
deteriorated.
[0075] Further, when the fastening member (not shown) is protruded
from a surface of the blade 140 and the corrugated panel 200 for
the wind power generator blade, noise may occur by resistance with
air.
[0076] Therefore, it is advantageous to use an adhesive for
coupling of the corrugated panel 200 for the wind power generator
blade and the blade 140. In this case, because the blade 140 is
installed and used outdoors, as an adhesive to be used outdoors, an
adhesive that can maintain enough strength while having high
weather resistance and water resistance is selected and used.
[0077] In the corrugated panel 200 for the wind power generator
blade, an upper boundary line UL in which a protruded end portion
of a plurality of wrinkles 202 that are protruded in an opposite
direction of a direction that is coupled to the suction side 141 of
the blade 140 is virtually connected may have a shape similar to
that of the suction side 141 of the blade 140.
[0078] When the blade 140 to which the corrugated panel 200 for the
wind power generator blade according to an exemplary embodiment of
the present invention is attached is positioned at an air current,
an vortex may be formed between the plurality of wrinkles 202, as
in the corrugated panel (20 of FIG. 6) that is described with
reference to FIG. 6. Therefore, the plurality of wrinkles 202
perform the same operation as that of forming of an additional
camber corresponding to a shape of the upper boundary line UL at
the suction side 141 of the blade 140.
[0079] In the blade 140 of the wind power generator 100, as
described above, research and development for a shape of the blade
140 for enabling to have a shape that can minimize generation of
noise and a vibration while increasing efficiency that changes a
wind to a torque to the maximum has been continuously
performed.
[0080] Therefore, in the already installed and using wind power
generator 100, it may be necessary to compensate a shape of the
blade 140. That is, even when a camber of the blade 140 may be
further increased, a shape thereof may not be applied.
[0081] In such a case, by coupling the corrugated panel 200 for the
wind power generator blade according to an exemplary embodiment of
the present invention to the blade 140, a performance of the blade
140 can be compensated.
[0082] Until a state before a state in which efficiency is rapidly
deteriorated, as a stall phenomenon occurs when increasing a camber
of the blade 140, as a camber increases, a lift of the blade 140
may increase.
[0083] A level in which a camber increases by the corrugated panel
200 for the wind power generator blade according to an exemplary
embodiment of the present invention may be determined by a gap p
and a height hr of the plurality of wrinkles 202 that are formed in
the corrugated panel 200 for the wind power generator blade.
[0084] Therefore, in order to improve a performance of the blade
140, after measuring a shape of the blade 140, by calculating a
difference from a shape of an optimally designed blade (not shown),
a gap p and a height hr of the plurality of wrinkles 202 to be
formed in the corrugated panel 200 for the wind power generator
blade may be determined according to a calculation result.
[0085] For reference, as an experimental result, a gap p of the
plurality of wrinkles 202 may be selected within a range of 0.1% to
5% of a chord length LC of a transverse section of the airfoil of
the blade 140 at a predetermined position. A height hr of the
plurality of wrinkles 202 may be selected within a range of 0.1% to
5% of a chord length LC of a transverse section of the airfoil of
the blade 140.
[0086] Although not shown, a plurality of wrinkles 202 that are
formed in the corrugated panel 200 for the wind power generator
blade may be each formed to have a transverse section of a
triangle, and although not shown, a transverse section thereof may
be formed to have one shape of a polygon, a semicircle, and an
oval. A shape of a transverse section of the wrinkles 202 may be
changed, as needed.
[0087] Further, the corrugated panel 200 for the wind power
generator blade according to an exemplary embodiment of the present
invention may be formed to have a light weight and enough
strength.
[0088] That is, the corrugated panel 200 for the wind power
generator blade may be made of various materials such as a titanium
alloy, an aluminum alloy, and a synthetic resin. For reference,
because a titanium alloy has excellent corrosion resistance to
seawater, when the titanium alloy is applied to a blade of a wind
power generator (not shown) that is installed on the sea, the
titanium alloy is advantageous, and the aluminum alloy and the
synthetic resin can have a light weight and high structural
strength.
[0089] In this way, when the corrugated panel 200 for the wind
power generator blade according to an exemplary embodiment of the
present invention is coupled to the blade 140, an efficiency of the
blade 140 is increased.
[0090] Further, the blade 140 increases stiffness to a bending
moment that is generated by a wind by a plurality of wrinkles 202
that are formed in the corrugated panel 200 for the wind power
generator blade, and thus an accident such as collision of a tip
portion of the blade 140 with the tower 110 can be decreased.
[0091] FIG. 9 is a diagram illustrating a section of a corrugated
panel for a wind power generator blade according to another
exemplary embodiment of the present invention.
[0092] Referring to FIG. 9, a corrugated panel 300 for a wind power
generator blade according to another exemplary embodiment of the
present invention includes a panel body 310, and at the other
surface of the panel body 310, a wrinkle portion 320 having a
plurality of wrinkles is formed.
[0093] Here, one surface of the panel body 310 is a surface that
may be coupled to the suction side (see 141 of FIG. 7) or the
pressure side (see 142 of FIG. 7) of the blade (see 140 of FIG. 7),
and at one surface of the panel body 310, protrusions and
depressions such as a plurality of wrinkles that are formed in the
wrinkle portion 320 may not be formed.
[0094] Therefore, when one surface of the panel body 310 is coupled
to the suction side (see 141 of FIG. 7) or the pressure side (see
142 of FIG. 7) of the blade (see 140 of FIG. 7) using an adhesive,
an enough contact area is secured and thus the one surface of the
panel body 310 is securely bonded to the suction side or the
pressure side.
[0095] A plurality of wrinkles that are formed in the wrinkle
portion 320 may be formed at the other surface of the panel body
310 in a length direction of the blade (see 140 of FIG. 7), i.e.,
from a route portion of the blade (see 140 of FIG. 7) to a
direction toward a tip portion, to be coupled to one surface of the
panel body 310, like a plurality of wrinkles 202 of the corrugated
panel (see 200 of FIG. 7) for a wind power generator blade
according to an exemplary embodiment of the present invention that
is described with reference to FIGS. 7 and 8.
[0096] A plurality of wrinkles that are formed in the wrinkle
portion 320 may have a value of a predetermined ratio, compared
with a chord length (see LC of FIG. 7) of a transverse section of
an airfoil of the blade (see 140 of FIG. 7) at a predetermined
position when one surface of the panel body 310 is coupled to the
blade (see 140 of FIG. 7), like a plurality of wrinkles 202 of the
corrugated panel (see 200 of FIG. 7) for a wind power generator
blade according to an exemplary embodiment of the present invention
that is described with reference to FIGS. 7 and 8.
[0097] Further, a height and a gap of a plurality of wrinkles that
are formed in the wrinkle portion 320 may be the same as those that
are described above, and as an experimental result, a gap of a
plurality of wrinkles may be selected within a range of 0.1% to 5%
of a chord length (see LC of FIG. 7) of a transverse section of the
airfoil of the blade (see 140 of FIG. 7) at a predetermined
position. Here, a height of the plurality of wrinkles that are
formed in the wrinkle portion 320 may be selected within a range of
0.1% to 5% of a chord length LC of a transverse section of the
airfoil of the blade (see 140 of FIG. 7).
[0098] A transverse section of the plurality of wrinkles that are
formed in the wrinkle portion 320 may have a triangle, as shown in
the drawing and may have one shape of a polygon, a semicircle, and
an oval that are not shown.
[0099] A coupling surface SSL that is indicated by a dotted line at
the drawing may have a shape of a surface in which one surface of
the panel body 310 is to be coupled, i.e., the suction side (see
141 of FIG. 7) or the pressure side (see 142 of FIG. 7) of the
blade (see 140 of FIG. 7). That is, the panel body 310 may be
formed to have flexibility to be deformed like a shape of the
coupling surface SSL that is displayed at the drawing.
[0100] In this case, when the connection portion 311 that connects
a plurality of wrinkles that are formed in the wrinkle portion 320
is smoothly foldably produced, the panel body 310 may be easily
coupled to coupling surfaces SSL of various shapes.
[0101] The panel body 310 may be made of various materials of a
titanium alloy, an aluminum alloy, and a synthetic resin, and when
the panel body 310 is made of a material no having flexibility, by
installing a hinge (not shown) in a connection portion 311, the
panel body 310 may have flexibility.
[0102] As in the corrugated panel (see 200 of FIG. 7) for a wind
power generator blade according to an exemplary embodiment of the
present invention that is described above, the corrugated panel 300
for a wind power generator blade according to another exemplary
embodiment of the present invention is coupled to the blade (see
140 of FIG. 7) of the wind power generator to improve efficiency
thereof.
[0103] As described above, in exemplary embodiments of the present
invention, by improving aerodynamic characteristics of a blade (not
shown) that is already installed and using in the wind power
generator (not shown) as well as a producing blade (not shown) of a
wind power generator, power generation efficiency of the wind power
generator (not shown) can be improved.
[0104] In the foregoing description, a corrugated panel for a wind
power generator blade according to an exemplary embodiment of the
present invention has been described, but the present invention is
not limited to an exemplary embodiment that is suggested at this
specification, and a person of an ordinary skill in the art
understanding the spirit or scope of the present invention may
easily suggest another exemplary embodiment by addition, change,
deletion, and addition of an constituent element within of the same
spirit or scope of the present invention, and this comes also
within the spirit or scope of the present invention.
INDUSTRIAL APPLICABILITY
[0105] According to an exemplary embodiment of the present
invention, by improving aerodynamic characteristics of a newly
produced wind power generator blade and a blade that has already
been installed in the wind power generator and that uses for the
wind power generator, power generation efficiency of the wind power
generator can be improved.
* * * * *