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WO2018168746A1 - Éolienne à axe vertical et dispositif de production d'énergie éolienne - Google Patents

Éolienne à axe vertical et dispositif de production d'énergie éolienne Download PDF

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Publication number
WO2018168746A1
WO2018168746A1 PCT/JP2018/009439 JP2018009439W WO2018168746A1 WO 2018168746 A1 WO2018168746 A1 WO 2018168746A1 JP 2018009439 W JP2018009439 W JP 2018009439W WO 2018168746 A1 WO2018168746 A1 WO 2018168746A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
inclined portion
vertical axis
tip inclined
vertical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/009439
Other languages
English (en)
Japanese (ja)
Inventor
伊藤　健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017050981A external-priority patent/JP2018155128A/ja
Priority claimed from JP2017050999A external-priority patent/JP7089848B2/ja
Priority claimed from JP2017051024A external-priority patent/JP7220018B2/ja
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to KR1020197027413A priority Critical patent/KR102499973B1/ko
Publication of WO2018168746A1 publication Critical patent/WO2018168746A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/061—Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/005—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor  the axis being vertical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/21—Rotors for wind turbines
    • F05B2240/211—Rotors for wind turbines with vertical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction

Definitions

  • the present invention relates to a vertical axis windmill having a vertical main shaft, and a wind power generator equipped with the vertical axis windmill.
  • Wind turbines used in wind power generators are roughly classified into horizontal axis types and vertical axis types.
  • the vertical axis type is often used for a relatively small windmill because a rotational force can be obtained regardless of the wind direction and control over the wind direction is unnecessary.
  • the amount of power generation depends on the shape of the blades, and the development of blades capable of efficient power generation is underway.
  • One of them is a blade having a blade tip inclined portion at the blade tip (for example, Patent Documents 1 to 4).
  • the blade tip inclined portion is a blade tip plate that is inclined so that the tip side approaches the vertical main axis.
  • JP 2004-204801 A JP 2004-293409 A JP 2011-169267 A JP 2016-205204 A
  • the effects of the blade tip slope described above are empirically known, the relationship between the overall shape of the blade and the shape of the blade tip slope and how the blade tip slope is shaped.
  • the relationship between the apex position which is the most advanced position in the axial direction in the blade tip inclined portion, and noise and resistance during idling has not been clear.
  • the resistance at the time of idling is a material for determining whether the rotation is likely to stop in the natural fluctuation fluctuating wind, and affects the power generation efficiency.
  • the apex position of the blade tip inclined portion is determined empirically, and it is not clear whether it is an appropriate position.
  • the vertical axis windmill of the present invention includes a vertical main shaft that is rotatably provided; A support provided on the vertical spindle; A wing connected to the vertical main shaft through the support and receiving wind to rotate about the axis of the vertical main shaft; A vertical axis windmill with The wing has a main wing portion extending in parallel with the vertical main shaft, and a wing tip inclined portion extending obliquely from both ends of the main wing portion toward the vertical main shaft, and the main wing portion and the wing tip inclination
  • the cross-sectional shape of the blade over the portion is such that at least one of the radially outer side and the inner surface of the blade is the thickest in the radial direction at a position closer to the front end than the center in the rotational direction of the blade.
  • the wing tip inclined portion has a shape that gradually bulges outward and / or inward in the radial direction from both front and rear ends in the direction of rotation, and the bulge amount of the radially outer surface gradually decreases toward the tip side.
  • the blade tip inclined portion has a shape in which the width of the blade in the rotational traveling direction becomes narrower toward the tip side,
  • the apex position that is the most distal position in the axial direction in the blade tip inclined portion is such that the distance from the rear end of the rotation traveling direction is 50% to 83% with respect to the width of the blade in the rotation traveling direction. It is in the range.
  • the distance from the rear end of the rotational direction in the rotational direction is more preferably in the range of 60% to 75% with respect to the width of the blade in the rotational direction.
  • the blade tip inclined part is a part intended to suppress the blade tip vortex, but the apex position of the blade tip inclined part affects the noise generation level and the resistance during idling.
  • the above ratio within the range of 50% to 83% is excellent in noise and resistance during idling. Furthermore, it has been found that the ratio is more preferably in the range of 60% to 75%.
  • the cross-sectional shape of the blade over the main wing portion and the blade tip inclined portion is radial so that the radial thickness is the thickest at a location closer to the front end than the center of the rotation direction of the blade.
  • the outer surface has a shape that gradually bulges outward in the radial direction from both front and rear ends in the direction of rotation of the blade, and the bending angle of the blade tip inclined portion with respect to the main wing portion is within a range of 20 ° to 55 °. May be.
  • the bending angle of the blade tip inclined portion is more preferably in the range of 40 ° to 50 °.
  • the blade tip inclined part is a part intended to suppress the blade tip vortex, but the bending angle affects the rotational energy conversion efficiency for converting wind energy into blade rotational energy. Further, the bending angle of the blade tip inclined portion also affects the resistance during idling and the degree of noise caused by wind noise. If the resistance during idling is large, the rotation of the wings is likely to stop when the wind is weakened in fluctuating wind.
  • the bending angle of the blade tip inclined portion within the range of 20 ° to 55 ° is comprehensively excellent in the rotational energy conversion efficiency, the resistance during idling, and the noise. Further, it has been found that the bending angle is more preferably within the range of 40 ° to 50 °.
  • the ratio of the axial length of the blade tip inclined portion to the half length of the entire axial length of the blade may be in the range of 10% to 20%.
  • the ratio of the length in the axial direction of each blade tip inclined portion to the length of half the length in the axial direction of the entire blade is more preferably in the range of 16% to 18%.
  • the blade tip inclined part is a part intended to suppress the blade tip vortex, but the ratio between the total length of the blade and the blade tip inclined part is the rotational energy conversion efficiency that converts wind energy into blade rotational energy. Affect.
  • the blade tip inclined portion with respect to the half length of the entire blade in the axial direction was analyzed. It has been found that the rotational efficiency is the highest when the ratio of length is around 17%, and that the rotational energy conversion efficiency decreases even when the ratio is larger or smaller. Further, it has been found that when the ratio is in the range of 10% to 20%, a high rotational efficiency is maintained to some extent. From this, it can be said that the ratio of the length of the blade tip inclined portion to the total length of the blade is preferably in the range of 10% to 20 °, and more preferably in the range of 16% to 18 °.
  • the wind power generator of the present invention includes the vertical axis wind turbine and a generator that generates electric power by the rotation of the vertical main shaft of the vertical axis wind turbine.
  • the vertical axis wind turbine used in this wind turbine generator can suppress noise and has low resistance during idling. For this reason, this wind power generator has low noise and good power generation efficiency in a fluctuating natural lee.
  • FIG. 4B is a VA-VA sectional view of FIG. 4B.
  • FIG. 4B is a VB-VB sectional view of FIG. 4B.
  • FIG. 4B is a sectional view taken along the line VC-VC in FIG. 4B. It is a front view which shows a part of each blade sample used for the analysis of the bending angle of a blade tip inclined part. It is a graph which shows the relationship between the bending angle of a blade tip inclination part, and the rotational moment which acts on a vertical main axis
  • FIG. 1 is a front view of a wind turbine generator having a vertical axis wind turbine according to an embodiment of the present invention
  • FIG. 2 is a plan view thereof.
  • a steel tower 2 is constructed on a foundation 1 built on the ground, and a wind power generator 3 is installed on the steel tower 2.
  • the wind power generator 3 includes a vertical axis windmill 4, a generator 6 that generates electric power by rotation of the vertical main shaft 5 of the vertical axis windmill 4, and other devices for power distribution and control.
  • the vertical main shaft 5 extends in the vertical direction, is rotatably supported by a bearing, and the lower portion is connected to the generator 6.
  • the vertical main shaft 5, the generator 6, and other equipment are covered with a cover 7.
  • a plurality of blades 9 are attached to the vertical main shaft 5 via a support 8.
  • the number of blades 9 is two, and each blade 9 is provided at a position with a 180 ° phase difference around the vertical main axis 5.
  • the number of wings 9 may be three or more.
  • the support 8 has one horizontal arm 8a that is horizontally fixed to the upper end of the vertical main shaft 5, and an upward oblique direction and a downward oblique direction from the vicinity of the central portion of the horizontal arm 8a toward the left and right sides of the figure. It consists of a total of four diagonal arms 8b.
  • the left wing 9 is coupled to the left end of the horizontal arm 8a and the left two oblique arms 8b, and the right wing 9 is coupled to the right end of the horizontal arm 8a and the two oblique arms 8b on the right side. Yes.
  • the vertical axis wind turbine 4 receives wind, the vertical axis wind turbine 4 rotates around the axis O of the vertical main shaft 5 in the direction of the arrow in FIG.
  • 3A and 3B are a front view and a side view of the wing 9, respectively.
  • the wings 9 are parallel to the vertical main shaft 5 (see FIG. 1), that is, a main wing portion 10 extending in the vertical direction, and upper and lower wings extending obliquely from the upper and lower ends of the main wing portion 10 to the vertical main shaft 5 side. It consists of the end inclined part 11.
  • the blade tip inclined portion 11 may extend linearly or may extend curvedly. In the case of a curved shape, the curved line may be an arc shape or a combination of a plurality of arcs having different curvatures.
  • the upper and lower blade tip inclined portions 11 are formed in the same shape that is line-symmetric with respect to the center line CL of the intermediate portion in the longitudinal direction of the main wing portion 10.
  • the axial center direction of the vertical main shaft 5 is referred to as “vertical direction”. Further, the outer diameter side in the radial direction around the axis O of the vertical main shaft 5 is defined as “outer side”, and the inner diameter side is defined as “inner side”. Further, when the vertical axis wind turbine 4 rotates in the direction of the arrow in FIG.
  • the rotational traveling direction R of the blade 9 is determined by the cross-sectional shape of the blade 9 described later.
  • the cross-sectional shape and cross-sectional dimension of the main wing part 10 are constant over the entire upper and lower parts, and the blade tip inclined part 11 becomes thinner toward the tip side.
  • the thickness of each of the main wing portion 10 and the blade tip inclined portion 11 varies depending on the position in the rotation traveling direction R as will be described later.
  • the thickness of the blade tip inclined portion 11 described above is about the thickness of the maximum thickness portion in the rotation traveling direction.
  • the positions of the maximum thickness portions of the main wing portion 10 and the wing tip inclined portion 11 are indicated by lines A1 and A2.
  • a line A1 indicating the maximum thickness part of the main wing part 10 is a straight line.
  • the line A2 indicating the maximum thickness portion of the blade tip inclined portion 11 varies depending on the apex position P which is the most advanced position in the vertical direction of the blade tip inclined portion 11.
  • the vertex position P is located on the line A2.
  • the line A2 indicating the maximum thickness part of the blade tip inclined part 11 is a straight line.
  • a line A2 indicating the maximum thickness portion of the blade tip inclined portion 11 is a line A1 indicating the maximum thickness portion of the main wing portion 10. Is a bent line.
  • the line A2 may be a curved line or a straight line, but in any case, it is desirable that the connecting portion between the tip end of the line A1 and the base end of the line A2 is smoothly connected.
  • FIG. 4B which is a partially enlarged view of FIG. 3B
  • the front edge 13F and the rear edge 13R are each formed in a straight line, and the width B1 in the rotation traveling direction R is constant.
  • the front edge 14F and the rear edge 14R of the blade tip inclined portion 11 are formed with curves smoothly connected to the front and rear edges 13F and 13R of the main wing portion 10, respectively, and the width in the rotation traveling direction R is toward the tip side. It gradually narrows gradually as you go.
  • the front and rear edges 14F, 14R of the blade tip inclined portion 11 are smoothly connected to each other, and the connected portion is the apex position P.
  • the curves forming the front and rear edges 14F and 14R of the blade tip inclined portion 11 are, for example, an arc or an elliptical arc.
  • a single curve may be sufficient as the curve which comprises the said edges 14F and 14R, and the some curve may be combined.
  • the front and rear edges 14F and 14R may be configured by combining straight lines and curves.
  • the blade tip inclined portion 11 includes a bent portion 11a continuing from the upper and lower ends of the main wing portion 10 and an inclined portion 11b extending obliquely from the bent portion 11a.
  • the front edge 13F of the main wing part 10 is linear when viewed from the front.
  • the front edge 14F of the blade tip inclined portion 11 has an arc shape that smoothly connects to the front edge 13F of the main wing portion 10 in the bent portion 11a, and is linear in the inclined portion 11b.
  • the rear edges 13R and 14R of the main wing part 10 and the blade tip inclined part 11 overlap with the front edges 13F and 14F at the same position in front view.
  • the outer surface 15 of the main wing portion 10 and the outer surface 16a of the bent portion 11a of the blade tip inclined portion 11 are smoothly connected, and the outer surface 16a of the bent portion 11a of the blade tip inclined portion 11 and the outer surface 17 of the inclined portion 11b. It is connected smoothly.
  • the outer surface 16a of the bent portion 11a and the outer surface 16b of the inclined portion 11b constitute the outer surface 16 of the blade tip inclined portion 11.
  • the outer outlines of the main wing part 10 and the wing tip inclined part 11 correspond to the lines A1 and A2 in FIGS. 3B and 4B, and the maximum thickness part of the main wing part 10 and the wing tip inclined part 11 is shown. Show. In the front view shown in FIG.
  • the outer contour line of the main wing portion 10 is linear, and the outer contour line of the wing tip inclined portion 11 is smoothly arc-shaped at the bent portion 11 a and smoothly curved to the arc at the inclined portion 11 b. It is a connected curve or straight line.
  • the inner side surface 17 of the main wing portion 10 and the inner side surface 18a of the bent portion 11a of the blade tip inclined portion 11 are smoothly connected, and the inner side surface 18a of the bent portion 11a of the blade tip inclined portion 11 and the inner side surface 18b of the inclined portion 11b. And are connected smoothly.
  • the inner side surface 18b of the inclined portion 11b of the blade tip inclined portion 11 is planar except for the tip portion, and the tip portion is curved.
  • the inner side surface 18 of the blade tip inclined portion 11 is constituted by the inner side surface 18a of the bent portion 11a and the inner side surface 18b of the inclined portion 11b.
  • FIG. 5A, 5B, and 5C are a VA-VA sectional view, a VB-VB sectional view, and a VC-VC sectional view of FIG. 4B, respectively.
  • the main wing part 10 and the wing tip inclined part 11 are shown as solid, but in actuality, they are made of various materials for weight reduction.
  • it may be formed in a hollow shape with a fiber reinforced resin or the like, or may be formed of a lightweight material such as foam or aluminum.
  • the main wing portion 10 and the wing tip inclined portion 11 have the outer surface 15, the thickness in the radial direction being the thickest at a location closer to the front end than the center of the rotation traveling direction R.
  • 16 (16 a, 16 b) and inner side surfaces 17, 18 (18 a, 18 b) are gradually bulging radially outward and inward from both front and rear ends with respect to the chord length 19.
  • the chord length 19 indicates a straight line passing through the front end QF and the rear end QR of the wing 9.
  • the outer side surfaces 15 and 16 bulge outward with respect to the chord length 19, and the inner side surfaces 17 and 18 bulge inward with respect to the chord length 19. Only one of the outer side surfaces 15 and 16 and the inner side surfaces 17 and 18 may be shaped to bulge with respect to the chord length 19.
  • the inner side surfaces 17 and 18 (18a and 18b) of the main wing portion 10 and the wing tip inclined portion 11 are curved inwardly in the vicinity of the front end QF.
  • it is linear from the end QR, it may have a shape that bulges inward in the radial direction from the front end to the rear end, or may have a shape in which the central portion in the radial direction is recessed.
  • the rotation locus C of the blade 9 is a locus through which the front end QF and the rear end QR of the blade 9 pass.
  • the front end side of the outer side surface 15 and the inner side surface 17 of the main wing part 10 are connected to each other with a smooth curved surface, and the front end QF of the main wing part 10 is located on this curved surface. Further, the rear end side of the outer side surface 15 and the inner side surface 17 intersect with each other at an acute angle, and this intersection portion becomes the rear end QR of the main wing portion 10.
  • the front end sides of the outer surface 16 (16a, 16b) and the inner surface 18 (18a, 18b) of the blade tip inclined portion 11 are connected to each other with a smooth curved surface. The front end QF of the blade tip inclined portion 11 is located above. Further, the rear end sides of the outer side surface 16 and the inner side surface 18 intersect with each other at an acute angle, and this intersection portion becomes the rear end QR of the blade tip inclined portion 11.
  • the cross-sectional shape of the leading end of the main wing part 10 and the cross-sectional shape of the base end of the blade tip inclined part 11 are the same.
  • the cross-sectional shape of each part in the inclination direction of the blade tip inclined part 11 may be a similar shape in which only the size changes depending on the position in the inclination direction, or may be a non-similar shape in which not only the size but also the shape changes.
  • the positions of the maximum thickness portions of the main wing portion 10 and the wing tip inclined portion 11 are in the same position in the rotation traveling direction R, so that the cross-sectional shapes of the respective portions in the inclined direction of the wing tip inclined portion 11 are substantially similar to each other.
  • the outer side surfaces 15, 16 a, 16 b and / or the inner side surfaces 17, 18 a, 18 b are formed so that the cross-sectional shape of the wing 9 is the thickest in the radial direction at the location near the front end of the rotation direction R of the wing 9. It is a shape which gradually bulges radially outward and / or inward from both front and rear ends in the rotational traveling direction R of the blade 9. For this reason, when the blade 9 receives wind, lift is generated in the blade 9, and the vertical axis wind turbine 4 rotates around the axis O of the vertical main shaft 5 in the rotation traveling direction R shown in FIG.
  • the blade tip inclined portions 11 are provided at both ends of the blade 9, the pressure difference between the inner side surfaces 17, 18 and the outer surfaces 15, 16 of the blade 9 is reduced, and air entrainment is suppressed. Vortices are less likely to occur and noise generation is suppressed.
  • the cross-sectional shape of the blade 9 is such that the radial thickness is the thickest at a location near the front end of the rotation traveling direction R, so that a strong lift is generated in front of the rotation traveling direction R, and the blade Even in the state where the pitch angle at which the front end QF and the rear end QR 9 are arranged is 0 °, the blade 9 can rotate.
  • the pitch angle is 0 °, the resistance during rotation, in particular, resistance during idling is reduced, and the rotation of the vertical axis wind turbine 4 is difficult to stop.
  • the blade tip inclined portion 11 has a shape in which the width in the rotation traveling direction R of the blade 9 becomes narrower toward the tip side, so that the air flow around the blade tip is smooth when the blade 9 is rotating. And the generation of noise can be suppressed.
  • the detailed shape of the blade tip inclined portion 11 is defined as follows. ing.
  • the bending angle ⁇ (FIG. 3A) of the upper and lower blade tip inclined portions 11 with respect to the main wing portion 10 is in the range of 20 ° to 55 °, more preferably in the range of 40 ° to 50 °.
  • the bending angle ⁇ is an angle formed by the center in the radial direction of the main wing part 10 (the center of the cross section) and the center in the radial direction of the blade tip inclined part 11 (the center of the cross section).
  • the front and rear edges 13F and 13R of the main wing part 10 and the front and rear edges 14F and 14R of the inclined part 11b of the blade tip inclined part 11 coincide with each other.
  • the desired bending angle ⁇ was obtained by the following fluid analysis.
  • the analysis was performed assuming five wing samples shown in FIG. 6 as specimens.
  • the wing 9A shown in FIG. 5A is composed only of the main wing portion 10 and does not have a blade tip inclined portion.
  • the bending angle ⁇ of the blade tip inclined portion 11 is 0 °, 20 °, 45 °, and 60 °, respectively. It is.
  • the total length of the wing 9A and the total length of the wing 9B are the same.
  • the blades 9B, 9C, 9D, and 9E have the same length of the main wing portion 10, and the length of the blade tip inclined portion 11 is also the same.
  • the size of the blades 9B, 9C, 9D, 9E was about 2800 mm in total length.
  • the noise gradually decreases when the bending angle ⁇ is around 0 ° to 45 °. However, when the angle exceeds 45 °, the noise does not decrease, and when the bending angle ⁇ exceeds a certain bending angle ⁇ , the noise tends to increase. It turns out that there is.
  • the bending angle ⁇ is less than 55 ° for the rotational energy conversion efficiency, and the blade tip inclined portion 11 is sufficient for the resistance during idling.
  • the bending angle ⁇ is preferably 20 ° or more.
  • the bending angle ⁇ of the blade tip inclined portion 11 with respect to the main wing portion 10 is preferably in the range of 20 ° to 55 °, more preferably 40 ° to 50 °.
  • the ratio of the vertical length L2 (FIG. 3A) of the blade tip inclined portion 11 to the half length L1 (FIG. 3A) of the entire vertical length of the blade 9 is in the range of 10% to 20 °, more preferably 16 % To 18 °.
  • the vertical length L2 of the blade tip inclined portion 11 refers to the length in the vertical direction from the base end of the bent portion 11a of the blade tip inclined portion 11 to the apex position P of the blade tip inclined portion 11.
  • the above desired ratio was obtained by the following fluid analysis.
  • the blade 9F shown in (A) has (L2 / L1) of 11.4%
  • the blade 9G shown in (B) has (L2 / L1) of 17.0%
  • the blade 9H shown in (C) is (L2 / L1) is 26.8%.
  • the blades 9F, 9G, and 9H have the same overall length (for example, L1 is about 1400 mm), and the bending angle ⁇ of the blade tip inclined portion 11 is 45 °.
  • FIG. 12 shows the analysis result of the rotational speed at which the calculation was performed by changing the rotational speed of the blade 9 in four ways, and the most efficient result was obtained. From this analysis result, it was found that the rotational energy conversion efficiency was the highest when (L2 / L1) was around 17%, and the rotational energy conversion efficiency was lowered even if it was larger or smaller than this. Further, it was found that a high rotational energy conversion efficiency is maintained to some extent when (L2 / L1) is within a range of 10% to 20%. From these, the desirable ratio between the length of the blade 9 and the length of the blade tip inclined portion 11 is derived.
  • the apex position P (FIG. 3B) of the blade tip inclined portion 11 is such that the ratio of the distance B2 from the rear end of the blade 9 in the rotation direction R to the width B1 in the rotation direction R of the blade 9 is in the range of 50% to 83%. Of these, a range of 60% to 75% is more preferable.
  • the desired apex position P of the blade tip inclined portion 11 was obtained by the following fluid analysis.
  • the blade 9I shown in (A) is 83% (B2 / B1)
  • the blade 9J shown in (B) is 75% (B2 / B1)
  • the blade 9K shown in (C) is (B2 / B1).
  • the blade 9L shown in (D) has (B2 / B1) of 33%.
  • Each blade 9I, 9J, 9K, 9L has the same width B1 in the traveling direction and the same thickness.
  • (B2 / B1) is preferably 50% or more for noise, and (B2 / B1) is also about 50% or more for resistance during idling. It can be said that it is preferable. However, if the apex position P of the blade tip inclined portion 11 is too front, the front end surface of the blade tip inclined portion 11 becomes wide, and the air resistance increases. As a result of complex determination, the B2 / B1 value is preferably in the range of 50% to 83%, and more preferably in the range of 60% to 75%. Thus, by setting the apex position P of the blade tip inclined portion, the vertical axis wind turbine 4 that can satisfy both noise and resistance during idling is obtained.
  • the vertical axis wind turbine 4 has a low resistance during idling and can suppress noise. For this reason, the wind turbine generator 3 using the vertical axis wind turbine 4 has good power generation efficiency and low noise.
  • a vertical main shaft provided rotatably, a support provided on the vertical main shaft, and a blade connected to the vertical main shaft via the support and receiving a wind to rotate about the axis of the vertical main shaft.
  • the wing has a main wing portion extending in parallel with the vertical main shaft, and a wing tip inclined portion extending obliquely from both ends of the main wing portion toward the vertical main shaft, and the main wing portion and the wing tip inclination
  • the cross-sectional shape of the blade across the portion is such that the radially outer surface is the front and rear of the blade in the direction of rotation so that the radial thickness is the thickest at a location closer to the front end than the center in the direction of rotation of the blade.
  • the blade tip inclined portion is a shape in which the bulge amount of the radially outer surface gradually decreases as going to the tip side
  • a vertical axis wind turbine in which a bending angle of the blade tip inclined portion with respect to the main wing portion is within a range of 20 ° to 55 °.
  • a bending angle of the blade tip inclined portion is within a range of 40 ° to 50 °.
  • a vertical main shaft provided rotatably, a support provided on the vertical main shaft, and a blade connected to the vertical main shaft via the support and receiving a wind to rotate about the axis of the vertical main shaft.
  • a vertical axis windmill The wing has a main wing portion extending in parallel with the vertical main shaft, and a wing tip inclined portion extending obliquely from both ends of the main wing portion toward the vertical main shaft, and the main wing portion and the wing tip inclination
  • the cross-sectional shape of the blade over the portion is such that at least one of the radially outer side and the inner surface of the blade is the thickest in the radial direction at a position closer to the front end than the center in the rotational direction of the blade.
  • the wing tip inclined portion has a shape that gradually bulges outward and / or inward in the radial direction from both front and rear ends in the direction of rotation, and the bulge amount of the radially outer surface gradually decreases toward the tip side.
  • the blade tip inclined portion has a shape in which the width of the blade in the rotational traveling direction becomes narrower toward the tip side,
  • a vertical axis wind turbine in which a ratio of a length in the axial direction of the blade tip inclined portion to a half length of the entire length in the axial direction of the entire blade is within a range of 10% to 20%.
  • the ratio of the axial length of each blade tip inclined portion to the half length of the entire axial length of the blade is 16% to 18%.
  • a vertical axis windmill that is in range.
  • a wind turbine generator comprising: the vertical axis wind turbine according to any one of aspects 1 to 6; and a generator that generates electric power by rotation of the vertical main shaft of the vertical axis wind turbine.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)

Abstract

Cette éolienne à axe vertical comporte une pale (9) reliée à un arbre principal vertical par l'intermédiaire d'un corps de support. La pale (9) comprend: une partie de pale principale (10) s'étendant parallèlement à l'arbre principal vertical; et une partie d'inclinaison d'extrémité de pale (11) s'étendant à partir des deux parties d'extrémité de la partie de pale principale (10), pliée de manière oblique vers le côté d'arbre principal vertical. La forme en coupe transversale de la pale (9) est une forme dans laquelle la surface sur le côté externe et/ou la surface sur le côté interne dans une direction radiale se bombent progressivement à partir des extrémités avant et arrière dans la direction de rotation de la pale (9) vers le côté externe et/ou le côté interne dans la direction radiale de telle sorte que l'épaisseur dans la direction radiale devient plus épaisse au niveau d'une partie sur le côté d'extrémité avant dans la direction de rotation de la pale (9). La partie d'inclinaison d'extrémité de pale (11) a une forme dans laquelle la largeur de la pale (9) dans la direction de rotation diminue vers le côté bord d'attaque. La position de sommet (P) de la partie d'inclinaison d'extrémité de pale (11) est située de telle sorte que la distance (B2) depuis le bord de fuite dans la direction de rotation jusqu'à la position de sommet se situe dans une plage de 50 à 83 % de la largeur (B1) de la pale (9) dans la direction de rotation.
PCT/JP2018/009439 2017-03-16 2018-03-12 Éolienne à axe vertical et dispositif de production d'énergie éolienne Ceased WO2018168746A1 (fr)

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JP2017050981A JP2018155128A (ja) 2017-03-16 2017-03-16 垂直軸風車および風力発電装置
JP2017050999A JP7089848B2 (ja) 2017-03-16 2017-03-16 垂直軸風車および風力発電装置
JP2017051024A JP7220018B2 (ja) 2017-03-16 2017-03-16 垂直軸風車および風力発電装置
JP2017-050999 2017-03-16
JP2017-050981 2017-03-16
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KR102507916B1 (ko) * 2021-08-12 2023-03-07 연세대학교 원주산학협력단 틸팅각 조절장치를 갖는 수직형 풍력터빈
KR102507915B1 (ko) * 2021-08-12 2023-03-07 연세대학교 원주산학협력단 틸팅각도 조절용 블레이드를 갖는 수직형 풍력터빈

Citations (3)

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US20160123299A1 (en) * 2014-11-02 2016-05-05 Tangshan TOYODA Technology Co., Ltd Dual rotor wind turbine generator set
JP2016176369A (ja) * 2015-03-19 2016-10-06 Ntn株式会社 翼車および自然エネルギー発電機
JP2016205204A (ja) * 2015-04-21 2016-12-08 中島　紳一郎 風車翼

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Publication number Priority date Publication date Assignee Title
JP4173727B2 (ja) 2002-12-26 2008-10-29 株式会社グローバルエナジー 風車の受風羽根
JP4184847B2 (ja) 2003-03-27 2008-11-19 株式会社東芝 風車装置及びそれを用いた風力発電装置
ES2441641T3 (es) * 2003-10-22 2014-02-05 Global Energy Co., Ltd. Aerogenerador de eje vertical
JP2011169267A (ja) 2010-02-19 2011-09-01 Global Energy Co Ltd 縦軸風車

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Publication number Priority date Publication date Assignee Title
US20160123299A1 (en) * 2014-11-02 2016-05-05 Tangshan TOYODA Technology Co., Ltd Dual rotor wind turbine generator set
JP2016176369A (ja) * 2015-03-19 2016-10-06 Ntn株式会社 翼車および自然エネルギー発電機
JP2016205204A (ja) * 2015-04-21 2016-12-08 中島　紳一郎 風車翼

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