CN210371017U - Wind wheel cross brace structure for restraining tip vortex - Google Patents
Wind wheel cross brace structure for restraining tip vortex Download PDFInfo
- Publication number
- CN210371017U CN210371017U CN201920865924.6U CN201920865924U CN210371017U CN 210371017 U CN210371017 U CN 210371017U CN 201920865924 U CN201920865924 U CN 201920865924U CN 210371017 U CN210371017 U CN 210371017U
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- cross brace
- tip
- wind wheel
- brace
- cross
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- 230000000452 restraining effect Effects 0.000 title claims abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- 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
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Abstract
A wind wheel cross brace structure for restraining tip vortexes belongs to the technical field of wind power generation. The tip baffle plates are arranged at two ends of the wind wheel blade of the cross-brace structure for inhibiting the tip vortex, 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 tip baffle plates through the 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 wheel blade through a connecting component. The tail edge of the baffle plate, the tail edge of the first cross brace, the tail edge of the connecting component and the tail edge of the second cross brace on one side of the central shaft face to the same direction; the trailing edge on the other side of the central axis faces in the same opposite direction. The structure inhibits the generation and the flow of tip vortexes 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 sawtooth or wave-shaped trailing 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 whole performance of the wind wheel is enhanced.
Description
Technical Field
The utility model relates to a restrain wind wheel stull structure of tip whirlpool belongs to wind power generation technical field.
Background
Wind energy is a renewable clean energy source with huge total reserves in nature. Wind energy is a focus of attention today in increasing shortage of fossil energy. In 2018, the installed capacity of the newly added wind power in the world is 51.3 GW. By the end of 2018, the total capacity of the global wind power installation reaches 591 GW. The current wind power generation devices are mainly horizontal axis fans and vertical axis fans. Compared with a horizontal shaft fan, the vertical shaft fan has the advantages of self-adaption to wind direction, flexibility in installation, small occupied area, low pneumatic noise and the like. As the upsizing of horizontal axis fans is limited by the strength of the blades, much attention has been paid to the development of vertical axis fans. The lift type vertical axis fan generates thrust to push the wind wheel to rotate through the pressure difference on the surfaces of the blades. In the rotating process of the wind wheel, because the extension of the blade is limited, 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 wheel blades need to be connected with the central shaft through the cross braces, and three-dimensional streaming generated when incoming flow flows through the upper and lower surfaces of the cross braces can also influence the stress on the surfaces of the blades. The three-dimensional effect created by the blade tips and the crossbrace reduces the overall efficiency of the wind turbine.
Disclosure of Invention
In order to solve the problem that exists among the prior art, restrain apex tip whirlpool and reduce the influence that the three-dimensional effect of stull department produced the wind wheel, the utility model provides a restrain wind wheel stull structure in tip whirlpool. According to the structure, the tip baffle is arranged to inhibit tip vortexes, the end cross brace arranged at the end part and connected with the tip baffle is arranged to reduce the influence of cross brace vortex shedding on the blade, the tip vortexes are further inhibited, and the end cross brace provides positive torque to push the wind wheel to rotate. The tail edges of the cross arm and the blade tip baffle are arranged to be zigzag or wavy, 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 brace.
The utility model provides a technical scheme that technical problem adopted is: a wind wheel cross brace structure for restraining tip vortex comprises a wind wheel blade and a central shaft, and further comprises a blade tip baffle plate provided with a baffle plate 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 plate 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 plate 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 baffle tail edge of the tip baffle on one 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 to the same direction; the baffle tail edge of the 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 to the same opposite direction.
The shapes of the tail edge of the baffle plate, the tail edge of the first cross brace, the tail edge of the second cross brace and the tail edge of the connecting member are zigzag or wavy.
The outline shape of the blade tip baffle is obtained by expanding the outline of the wind wheel blade or is circular.
The connecting component is a variable cross-section airfoil, and the end cross braces and the middle cross braces are equal cross-section airfoils.
The utility model has the advantages that: the wind wheel cross brace structure for inhibiting the tip vortex is characterized in that tip baffles are arranged at two ends of a wind wheel blade, one end of the 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 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 baffle plate, the tail edge of the first cross brace, the tail edge of the connecting component and the tail edge of the second cross brace on one side of the central shaft face to the same direction; the baffle tail edge on the other side of the central shaft, the first cross brace tail edge, the connecting member tail edge and the second cross brace tail edge face the same opposite direction. The structure inhibits the generation and the flow of tip vortexes and improves the overall efficiency of the wind wheel. Meanwhile, the blade tip baffle, the end transverse support, the middle transverse support and the connecting component are provided with a sawtooth-shaped or wavy trailing edge 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 at the blade tip and the cross brace of the wind wheel to be restrained, and the whole performance of the wind wheel is enhanced.
Drawings
Figure 1 is a perspective view of a wind turbine cross brace configuration for suppressing tip vortices.
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 cross brace torque curve comparison graph of a wind turbine cross brace structure for restraining tip vortex and a common cross brace structure.
FIG. 5 is a comparison graph of the total torque curve of a wind wheel single blade of a wind wheel cross brace structure for restraining tip vortex and a common cross brace structure.
In the figure: 1. wind wheel blade, 2, apex baffle, 2a, baffle trailing edge, 3, tip stull, 3a, first stull trailing edge, 4, middle stull, 4a, second stull trailing edge, 5, center pin, 6, connecting elements, 6a, connecting elements trailing edge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the drawings in the embodiments of the present invention will be combined below to clearly and completely describe the technical solutions of the present invention.
Fig. 1 shows a wind turbine structure diagram of a wind turbine cross brace structure for suppressing tip vortices. In the figure, the tip vortex suppressing stull structure includes a wind turbine blade 1, a central shaft 5, a tip shroud 2 provided with a shroud trailing edge 2a, an end stull 3 provided with a first stull trailing edge 3a, a connecting member 6 provided with a connecting member trailing edge 6a, and an intermediate stull 4 provided with a second stull trailing edge 4 a. The both ends of wind wheel blade 1 set up apex baffle 2, and the one end and the center pin 5 fixed connection of tip stull 3, the other end of tip stull 3 passes through connecting elements 6 and apex baffle 2 fixed connection. 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 wheel blade 1 through the connecting component 6. The shroud trailing edge 2a of the tip shroud 2 on the center axis 5 side, the first wale trailing edge 3a of the end wale 3, the connecting member trailing edge 6a of the connecting member 6, and the second wale trailing edge 4a of the intermediate wale 4 face in the same direction. The blade tip shroud 2 trailing edge 2a on the other side of the central axis 5, the first cross brace trailing edge 3a of the end cross brace 3, the connecting member trailing edge 6a of the connecting member 6, and the second cross brace trailing edge 4a of the middle cross brace 4 face in the same opposite direction. The shape of the baffle trailing edge 2a, the first wale trailing edge 3a, the second wale trailing edge 4a, and the connecting member trailing edge 6a is zigzag or wavy. The outline shape of the tip baffle 2 is expanded from the outline of the wind turbine blade 1 or is circular. The connecting component 6 is a variable cross-section airfoil, and the end cross braces 3 and the middle cross braces 4 are constant cross-section airfoils.
Fig. 2 and 3 show a specific structure 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 provided in a zigzag shape, respectively.
The wind wheel blades 1 are uniformly distributed along the circumferential direction of the wind wheel at equal intervals, the blade tip baffles 2 are arranged at two ends of the wind wheel blades, the outlines of the blade tip baffles 2 are obtained by equidistance outward expansion of airfoil curves of the wind wheel blades 1 or are circular, and blade tip vortex can be effectively inhibited. The tip baffle 2 is connected with a central shaft 5 through an end cross brace 3, the side, connected with the tip baffle 2, of the end cross brace 3 is a variable-section airfoil profile, and the side, connected with the central shaft 5, of the tip baffle is an equal-section airfoil profile. The profile of the end crossbrace 3 is laid out from the airfoil profile of the rotor blade 1. The end cross brace 3 can further restrain tip vortex of the blade tip, and positive torque is generated to push the wind wheel to rotate. The wind wheel blade 1 is connected with a central shaft 5 through a middle cross brace 4 in the midspan, the side, connected with the blade, of the middle cross brace 4 is a variable-section airfoil profile, and the side, connected with the central shaft 5, of the middle cross brace 4 is an equal-section airfoil profile. The profile of the middle cross brace 4 is obtained by lofting the airfoil profile of the wind turbine blade 1. 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 are arranged in a zigzag or wavy shape, so that falling wake vortexes can be reduced, and vibration is reduced.
Figure 4 shows a cross-brace torque curve comparison of a wind turbine cross-brace structure for tip vortex suppression and a conventional cross-brace structure. The end cross brace mainly performs positive work in the rotation period of the wind wheel to improve the performance of the wind wheel, and the common cross brace generates resistance in the rotation period of the wind wheel to reduce the efficiency of the wind wheel.
Fig. 5 shows a comparison graph of the total torque curves of a wind turbine single blade of a wind turbine cross brace structure for restraining tip vortex and a common cross brace structure. A wind wheel cross brace structure for restraining tip vortex has 8.80% of torque gain compared with a wind wheel with a common cross brace structure.
Claims (4)
1. A wind wheel cross brace structure for restraining tip vortex comprises a wind wheel blade (1) and a central shaft (5), and is characterized by further comprising a tip baffle (2) provided with a baffle trailing edge (2 a), an end cross brace (3) provided with a first cross brace trailing edge (3 a), a connecting member (6) provided with a connecting member trailing edge (6 a), and a middle cross brace (4) provided with a second cross brace trailing edge (4 a), wherein the tip baffle (2) is arranged at two ends of the wind wheel blade (1), one end of the end cross brace (3) is fixedly connected with the central shaft (5), and the other end of the end cross brace (3) is fixedly connected with the tip baffle (2) through the connecting member (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 wheel blade (1) through a connecting component (6); the baffle tail edge (2 a) of the blade tip baffle (2) on one 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 to the same direction; the baffle tail edge (2 a) of the blade tip baffle (2) on 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 the same opposite direction.
2. The wind turbine shroud ring structure of claim 1, characterized in that the baffle trailing edge (2 a), first shroud trailing edge (3 a), second shroud trailing edge (4 a) and connecting member trailing edge (6 a) are serrated or wavy in shape.
3. The wind turbine shroud structure for suppressing tip vortices according to claim 1, wherein the tip shroud (2) has a contour shape that is flared from the contour of the wind turbine blade (1) or is rounded.
4. A wind turbine shroud ring structure for suppressing tip vortices according to claim 1 wherein the connecting members (6) are of variable cross-section aerofoil type and the end (3) and intermediate (4) shrouds are of constant cross-section aerofoil type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920865924.6U CN210371017U (en) | 2019-08-09 | 2019-08-09 | Wind wheel cross brace structure for restraining tip vortex |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920865924.6U CN210371017U (en) | 2019-08-09 | 2019-08-09 | Wind wheel cross brace structure for restraining tip vortex |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210371017U true CN210371017U (en) | 2020-04-21 |
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ID=70264014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920865924.6U Withdrawn - After Issue CN210371017U (en) | 2019-08-09 | 2019-08-09 | Wind wheel cross brace structure for restraining tip vortex |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210371017U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219773A (en) * | 2019-08-09 | 2019-09-10 | 大连理工大学 | A kind of wind wheel transverse brace structure inhibiting tip whirlpool |
-
2019
- 2019-08-09 CN CN201920865924.6U patent/CN210371017U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219773A (en) * | 2019-08-09 | 2019-09-10 | 大连理工大学 | A kind of wind wheel transverse brace structure inhibiting tip whirlpool |
| CN110219773B (en) * | 2019-08-09 | 2024-01-09 | 大连理工大学 | Wind wheel cross brace structure for suppressing tip vortex |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200421 Effective date of abandoning: 20240109 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20200421 Effective date of abandoning: 20240109 |