CN110219773B - Wind wheel cross brace structure for suppressing tip vortex - Google Patents
Wind wheel cross brace structure for suppressing tip vortex Download PDFInfo
- Publication number
- CN110219773B CN110219773B CN201910499357.1A CN201910499357A CN110219773B CN 110219773 B CN110219773 B CN 110219773B CN 201910499357 A CN201910499357 A CN 201910499357A CN 110219773 B CN110219773 B CN 110219773B
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- CN
- China
- Prior art keywords
- cross brace
- tip
- baffle
- wind wheel
- blade
- Prior art date
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- 230000000694 effects Effects 0.000 abstract description 6
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
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- 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
- F03D3/062—Rotors characterised by their construction elements
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- 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
- F03D3/062—Rotors characterised by their construction elements
- F03D3/064—Fixing wind engaging parts to rest of rotor
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- 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
- F03D7/00—Controlling wind motors
- F03D7/06—Controlling wind motors the wind motors having rotation axis substantially perpendicular to the air flow entering the rotor
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- 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
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
-
- 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
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- 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
Abstract
A wind wheel cross brace structure for suppressing tip vortex belongs to the technical field of wind power generation. The tip vortex suppressing cross brace structure is characterized in that tip baffles are arranged at two ends of a wind turbine blade, one end of an end cross brace is fixedly connected with a central shaft, and the other end of the end cross brace is fixedly connected with the tip baffles through a connecting component; one end of the middle cross brace is fixedly connected with the central shaft, and the other end of the middle cross brace is fixedly connected with the middle part of the wind turbine blade through a connecting component. The tail edge of the baffle plate, the tail edge of the first transverse strut, the tail edge of the connecting component and the tail edge of the second transverse strut at one side of the central shaft face the same direction; the trailing edges on the other side of the central axis face in the same opposite direction. The structure inhibits the generation and flow of tip vortex and improves the overall efficiency of the wind wheel. The blade tip baffle, the end cross braces, the middle cross braces and the connecting members are provided with saw-tooth-shaped or wave-shaped tail edges so as to reduce falling wake vortexes, reduce vibration and improve the overall stability of the wind wheel. The three-dimensional effect at the blade tip and the cross brace of the wind wheel is restrained, and the gain effect is achieved on the overall performance of the wind wheel.
Description
Technical Field
The invention relates to a wind wheel cross brace structure for suppressing tip vortex, and belongs to the technical field of wind power generation.
Background
Wind energy is a renewable clean energy source and has a huge total reserve in nature. Today, where fossil energy is increasingly scarce, wind energy is a focus of attention. In 2018, the global newly-increased installed capacity of wind was 51.3GW. By 2018, the total capacity of the global wind power installation reaches 591GW. The current wind power generation device mainly comprises a horizontal axis fan and a vertical axis fan. Compared with a horizontal axis fan, the vertical axis fan has the advantages of self-adaption to wind direction, flexible installation, small occupied area, small pneumatic noise and the like. Since the enlargement of the horizontal axis fans is limited by the strength of the blades, much attention is being paid to the development of the vertical axis fans. The lift type vertical axis fan generates thrust through the pressure difference on the surface of the blade to push the wind wheel to rotate. In the process of rotating the wind wheel, because the blade has limited growth, fluid can flow from the pressure surface to the suction surface of the blade, complex three-dimensional tip vortex flow is generated at the end part of the blade, the pressure distribution of the surface of the blade is changed, the pressure difference of the surface of the blade is reduced, and the torque on the wind wheel is reduced. On the other hand, the wind turbine blade needs to be connected with the central shaft through the cross brace, and the three-dimensional bypass flow generated by the flowing of the incoming flow through the upper surface and the lower surface of the cross brace can also influence the stress on the surface of the blade. The three-dimensional effect created by the blade ends and the cross braces reduces the overall efficiency of the wind wheel.
Disclosure of Invention
In order to solve the problems in the prior art, to restrain tip vortex and reduce the influence of three-dimensional effect at a cross brace on a wind wheel, the invention provides a wind wheel cross brace structure for restraining tip vortex. According to the structure, tip vortex is restrained by arranging the tip baffle, the end cross brace which is arranged at the end and connected with the tip baffle is used for reducing the influence of the cross brace vortex on the blade, tip vortex is further restrained, and the end cross brace provides forward torque to push the wind wheel to rotate. The tail edges of the cross braces and the blade tip baffle plates are arranged in a sawtooth shape or a wave shape, so that falling wake vortexes are reduced, and vibration is reduced. The overall stability of the wind wheel is improved by arranging the middle cross braces.
The technical scheme adopted for solving the technical problems is as follows: the wind wheel cross brace structure for suppressing tip vortex comprises a wind wheel blade and a central shaft, and further comprises a blade tip baffle provided with a baffle tail edge, an end cross brace provided with a first cross brace tail edge, a connecting member provided with a connecting member tail edge and a middle cross brace provided with a second cross brace tail edge, wherein the blade tip baffle is arranged at two ends of the wind wheel blade, one end of the end cross brace is fixedly connected with the central shaft, and the other end of the end cross brace is fixedly connected with the blade tip baffle through the connecting member; one end of the middle cross brace is fixedly connected with the central shaft, and the other end of the middle cross brace is fixedly connected with the middle part of the wind wheel blade through a connecting component; the tail edge of the blade tip baffle at one side of the central shaft, the tail edge of the first cross brace of the end cross brace, the tail edge of the connecting member and the tail edge of the second cross brace of the middle cross brace face the same direction; the baffle tail edge of the blade tip baffle on the other side of the central shaft, the first cross brace tail edge of the end cross brace, the connecting member tail edge of the connecting member and the second cross brace tail edge of the middle cross brace face the same opposite direction.
The shape of the baffle trailing edge, the first transverse strut trailing edge, the second transverse strut trailing edge and the connecting member trailing edge is zigzag or wavy.
The contour shape of the blade tip baffle is obtained by expanding the contour of the wind turbine blade or is round.
The connecting member is a variable-section wing profile, and the end cross braces and the middle cross braces are constant-section wing profiles.
The beneficial effects of the invention are as follows: the tip vortex suppressing wind wheel cross brace structure is characterized in that tip baffles are arranged at two ends of a wind wheel blade, one end of an end cross brace is fixedly connected with a central shaft, and the other end of the end cross brace is fixedly connected with the tip baffles through a connecting component; one end of the middle cross brace is fixedly connected with the central shaft, and the other end of the middle cross brace is fixedly connected with the middle part of the wind turbine blade through a connecting component. The tail edge of the baffle plate, the tail edge of the first transverse strut, the tail edge of the connecting component and the tail edge of the second transverse strut at one side of the central shaft face the same direction; the trailing edge of the baffle, the trailing edge of the first cross brace, the trailing edge of the connecting member and the trailing edge of the second cross brace on the other side of the central axis face in the same opposite direction. The structure inhibits the generation and flow of tip vortex and improves the overall efficiency of the wind wheel. And meanwhile, the blade tip baffle, the end cross braces, the middle cross braces and the connecting members are provided with saw-tooth-shaped or wave-shaped tail edges so as to reduce falling wake vortexes, reduce vibration and improve the overall stability of the wind wheel. The structure enables the three-dimensional effect of the blade tip and the cross brace of the wind wheel to be restrained, and has a gain effect on the overall performance of the wind wheel.
Drawings
FIG. 1 is a perspective view of a tip vortex suppressing wind turbine cross brace structure.
Fig. 2 is an enlarged view of a in fig. 1.
Fig. 3 is an enlarged view of B in fig. 1.
FIG. 4 is a graph comparing a cross brace torque curve of a tip vortex suppressing wind wheel cross brace structure with a conventional cross brace structure.
Fig. 5 is a graph comparing total torque curves of single blades of a wind wheel stump structure for suppressing tip vortex with those of a common stump structure.
In the figure: 1. wind turbine blade, 2, tip baffle, 2a, baffle tail edge, 3, end cross brace, 3a, first cross brace tail edge, 4, middle cross braces, 4a, second cross brace trailing edges, 5, central shafts, 6, connecting members, 6a and connecting member trailing edges.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Fig. 1 shows a wind wheel structure diagram of a wind wheel cross brace structure for suppressing tip vortex. In the figure, the stump vortex suppressing stump structure comprises a wind turbine blade 1, a central shaft 5, a tip baffle 2 provided with a baffle tail edge 2a, an end stump 3 provided with a first stump tail edge 3a, a connecting member 6 provided with a connecting member tail edge 6a and an intermediate stump 4 provided with a second stump tail edge 4 a. The two ends of the wind turbine blade 1 are provided with blade tip baffles 2, one end of an end cross brace 3 is fixedly connected with a central shaft 5, and the other end of the end cross brace 3 is fixedly connected with the blade tip baffles 2 through a connecting component 6. One end of the middle cross brace 4 is fixedly connected with the central shaft 5, and the other end of the middle cross brace 4 is fixedly connected with the middle part of the wind turbine blade 1 through a connecting component 6. The blade tip fence 2 on the center axis 5 side has a fence tail edge 2a, a first cross brace tail edge 3a of the end cross brace 3, a connecting member tail edge 6a of the connecting member 6, and a second cross brace tail edge 4a of the intermediate cross brace 4 facing in the same direction. The blade tip fence 2 on the other side of the center axis 5 has a fence trailing edge 2a, a first cross-brace trailing edge 3a of the end cross-brace 3, a connecting member trailing edge 6a of the connecting member 6, and a second cross-brace trailing edge 4a of the intermediate cross-brace 4 facing in the same opposite direction. The shape of the baffle trailing edge 2a, the first cross brace trailing edge 3a, the second cross brace trailing edge 4a, and the connecting member trailing edge 6a is zigzag or wavy. The profile shape of the tip baffle 2 is flared or rounded from the profile of the rotor blade 1. The connecting member 6 is a variable section airfoil, and the end cross brace 3 and the middle cross brace 4 are equal section airfoils.
Fig. 2 and 3 show a specific configuration in which the baffle trailing edge 2a, the first wale trailing edge 3a, the second wale trailing edge 4a, and the connecting member trailing edge 6a are arranged in a zigzag shape, respectively.
The wind turbine blades 1 are uniformly distributed at equal intervals along the circumferential direction of the wind turbine, the tip baffle plates 2 are arranged at two ends, the profile of each tip baffle plate 2 is obtained by equally spreading or is round by the airfoil curve of the wind turbine blade 1, and tip vortex can be effectively restrained. The blade tip baffle 2 is connected with the central shaft 5 through the end cross brace 3, the side, connected with the blade tip baffle 2, of the end cross brace 3 is a variable-section wing profile, and the side, connected with the central shaft 5, is a constant-section wing profile. The profile of the end cross brace 3 is laid out from the airfoil profile of the rotor blade 1. The tip vortex can be further restrained by the end cross brace 3, and positive torque is generated to push the wind wheel to rotate. The wind turbine blade 1 is connected with a central shaft 5 through a middle cross brace 4, the side, connected with the blade, of the middle cross brace 4 is a variable-section wing profile, and the side, connected with the central shaft 5, is a constant-section wing profile. The profile of the intermediate transverse strut 4 is obtained by lofting the airfoil profile of the rotor blade 1. The arrangement of the baffle trailing edge 2a, the first cross brace trailing edge 3a, the second cross brace trailing edge 4a and the connecting member trailing edge 6a in a zigzag or wavy shape can reduce the falling wake vortex and reduce vibration.
FIG. 4 shows a graph comparing the cross brace torque curves of a tip vortex suppressing wind wheel cross brace structure and a conventional cross brace structure. The end cross braces mainly do positive work in the wind wheel rotation period to improve the wind wheel performance, and the common cross braces generate resistance in the wind wheel rotation period to reduce the wind wheel efficiency.
Fig. 5 shows a graph of comparing total torque curves of single blades of a wind turbine cross brace structure for suppressing tip vortex and a wind turbine of a common cross brace structure. A wind wheel transverse strut structure for suppressing tip vortex has 8.80% torque gain compared with a wind wheel with a common transverse strut structure.
Claims (4)
1. The utility model provides a wind wheel stull structure for suppressing tip vortex, includes wind wheel blade (1) and center pin (5), and its characterized in that still includes tip baffle (2) that are equipped with baffle trailing edge (2 a), tip stull (3) that are equipped with first stull trailing edge (3 a), connecting element (6) that are equipped with connecting element trailing edge (6 a) and middle stull (4) that are equipped with second stull trailing edge (4 a), tip baffle (2) are set up at the both ends of wind wheel blade (1), and one end and center pin (5) fixed connection of tip stull (3), and the other end and tip baffle (2) are passed through connecting element (6) fixed connection of tip stull (3); one end of the middle cross brace (4) is fixedly connected with the central shaft (5), and the other end of the middle cross brace (4) is fixedly connected with the middle part of the wind turbine blade (1) through a connecting component (6); the blade tip baffle (2) on one side of the central shaft (5) has a baffle tail edge (2 a), a first cross brace tail edge (3 a) of the end cross brace (3), a connecting member tail edge (6 a) of the connecting member (6) and a second cross brace tail edge (4 a) of the middle cross brace (4) facing in the same direction; the baffle tail edge (2 a) of the blade tip baffle (2) at the other side of the central shaft (5), the first cross brace tail edge (3 a) of the end cross brace (3), the connecting member tail edge (6 a) of the connecting member (6) and the second cross brace tail edge (4 a) of the middle cross brace (4) face in the same opposite direction.
2. A wind turbine cross brace structure for suppressing tip vortex according to claim 1, characterized in that the shape of the baffle trailing edge (2 a), the first cross brace trailing edge (3 a), the second cross brace trailing edge (4 a) and the connecting member trailing edge (6 a) is saw-tooth or wave-like.
3. Wind turbine stump structure suppressing tip vortex according to claim 1, characterized in that the profile shape of the tip baffle (2) is flared or rounded from the profile of the wind turbine blade (1).
4. A wind turbine cross brace structure for suppressing tip vortex according to claim 1, wherein the connecting member (6) is a variable section airfoil, and the end cross brace (3) and the intermediate cross brace (4) are equal section airfoils.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910499357.1A CN110219773B (en) | 2019-08-09 | 2019-08-09 | Wind wheel cross brace structure for suppressing tip vortex |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910499357.1A CN110219773B (en) | 2019-08-09 | 2019-08-09 | Wind wheel cross brace structure for suppressing tip vortex |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110219773A CN110219773A (en) | 2019-09-10 |
| CN110219773B true CN110219773B (en) | 2024-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910499357.1A Active CN110219773B (en) | 2019-08-09 | 2019-08-09 | Wind wheel cross brace structure for suppressing tip vortex |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334004A (en) * | 2007-06-25 | 2008-12-31 | 通用电气公司 | Power loss reduction in turbulent wind for a wind turbine using localized sensing and control |
| CN102975851A (en) * | 2012-07-17 | 2013-03-20 | 江闻杰 | Multifunction wing tip turbine engine having fore-lying impellers |
| CN104153950A (en) * | 2014-07-25 | 2014-11-19 | 中材科技风电叶片股份有限公司 | Megawatt wind power generation blade with blade-tip turbulent flow structure and forming method of megawatt wind turbine blade |
| EP3205874A1 (en) * | 2016-02-12 | 2017-08-16 | LM WP Patent Holding A/S | Serrated trailing edge panel for a wind turbine blade |
| CN210371017U (en) * | 2019-08-09 | 2020-04-21 | 大连理工大学 | Wind wheel cross brace structure for restraining tip vortex |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130121832A1 (en) * | 2011-11-11 | 2013-05-16 | Gerald L. Barber | Wind Turbine with Cable Supported Perimeter Airfoil |
-
2019
- 2019-08-09 CN CN201910499357.1A patent/CN110219773B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334004A (en) * | 2007-06-25 | 2008-12-31 | 通用电气公司 | Power loss reduction in turbulent wind for a wind turbine using localized sensing and control |
| CN102975851A (en) * | 2012-07-17 | 2013-03-20 | 江闻杰 | Multifunction wing tip turbine engine having fore-lying impellers |
| CN104153950A (en) * | 2014-07-25 | 2014-11-19 | 中材科技风电叶片股份有限公司 | Megawatt wind power generation blade with blade-tip turbulent flow structure and forming method of megawatt wind turbine blade |
| EP3205874A1 (en) * | 2016-02-12 | 2017-08-16 | LM WP Patent Holding A/S | Serrated trailing edge panel for a wind turbine blade |
| CN210371017U (en) * | 2019-08-09 | 2020-04-21 | 大连理工大学 | Wind wheel cross brace structure for restraining tip vortex |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110219773A (en) | 2019-09-10 |
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