CN113074092B - Wind power generation system and method for reducing wake flow by utilizing grille - Google Patents
Wind power generation system and method for reducing wake flow by utilizing grille Download PDFInfo
- Publication number
- CN113074092B CN113074092B CN202110536810.9A CN202110536810A CN113074092B CN 113074092 B CN113074092 B CN 113074092B CN 202110536810 A CN202110536810 A CN 202110536810A CN 113074092 B CN113074092 B CN 113074092B
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- grid
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- inner ring
- wind power
- grid system
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- 238000010248 power generation Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005461 lubrication Methods 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
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
-
- 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
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
-
- 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
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
-
- 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
Landscapes
- 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)
- Wind Motors (AREA)
Abstract
The invention discloses a wind power generation system and a method for reducing wake flow by utilizing a grid, wherein the system comprises a grid system, a wind wheel system and a cabin; the wind wheel system comprises blades and a hub, wherein the blades are arranged on the hub, and the hub is arranged at the front end of the engine room through a rotating shaft; the grid system is arranged on the engine room and positioned at the rear end of the wind direction of the blade; and a silk screen is arranged on the grid system. According to the invention, through the grid system arranged behind the wind wheel, wind flowing through the wind wheel is rectified, so that the turbulence degree of wind at the downstream of the wind wheel is reduced, and the operation safety of the wind generating set is improved; the wake loss of the wind power generation field can be obviously reduced, and the generating capacity of the wind power generation field is improved; the interval between adjacent wind generating sets can be reduced, so that the engineering cost is reduced, and the land utilization rate is improved.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a wind power generation system and a method for reducing wake flow by utilizing a grid.
Background
The horizontal axis wind turbine is one of wind turbines. The horizontal axis wind driven generator can be divided into a lift type wind driven generator and a resistance type wind driven generator, wherein the lift type wind driven generator is high in rotation speed and the resistance type wind driven generator is low in rotation speed. For wind power generation, lift-type horizontal axis wind turbines are often used.
For the traditional horizontal axis wind driven generator, wind forms vortex after passing through the rotating surface of the wind wheel, a huge wake flow area is generated behind the wind wheel, the performance of the rear wind driven generator is obviously affected, and the air current interference can be completely eliminated only when the distance between the front unit and the rear unit exceeds 20 times of the diameter of the wind wheel, so that the cost for laying cables is greatly increased and a large amount of land resources are wasted. Meanwhile, wake flow not only can influence the generated energy, but also can bring additional turbulence to influence the operation safety of the downstream wind turbine.
Disclosure of Invention
The invention aims to provide a wind power generation system and a method for reducing wake flow by utilizing a grid, so as to reduce wake flow loss of a wind driven generator and improve generating capacity and operation safety of a unit.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a wind power generation system for reducing wake flow using a grid, comprising: a grid system, a wind wheel system and a nacelle;
the wind wheel system comprises blades and a hub, wherein the blades are arranged on the hub, and the hub is arranged at the front end of the engine room through a rotating shaft;
the grid system is arranged on the engine room and positioned at the rear end of the wind direction of the blade; and a silk screen is arranged on the grid system.
The invention is further improved in that: the grid system comprises a plurality of fixing rings, wherein each fixing ring comprises an outermost outer ring, an innermost inner ring and a middle fixing ring; the diameter of the middle fixing ring is sequentially reduced from outside to inside; the outer ring, the middle fixing ring and the inner ring are radially connected through a plurality of spokes, so that a plurality of trapezoid-like grids are formed in the grid system, and silk screens are installed in the grids.
The invention is further improved in that: the grid system is fixed to the nacelle by means of an inner ring.
The invention is further improved in that: the radius of the outer ring in the grid system is greater than the length of the blades.
The invention is further improved in that: the cabin is provided with a horizontal guide rail; the inner ring is provided with a guide groove matched with the horizontal guide rail; the cabin is provided with a driving mechanism, the movable end of the driving mechanism is connected with the inner ring, and the inner ring can be driven to drive the whole grid system to move along the horizontal guide rail.
The invention is further improved in that: the driving mechanism is a hydraulic mechanism or an air cylinder.
The invention is further improved in that: the inner ring is arranged on a horizontal guide rail of the engine room through a bearing;
the bearing comprises an inner layer and an outer layer which are in sliding fit with each other; the inner layer is internally provided with a groove matched with the horizontal guide rail, and the outer layer is fixedly connected with the inner ring;
the inner ring is provided with a circle of teeth; the wind power generation system for lowering wake flow by utilizing the grille further comprises a driving motor matched with the teeth on the inner ring; the rotating shaft of the driving motor is provided with a driving gear which is meshed with the teeth on the inner ring.
A method of operating a wind power generation system utilizing a grid to reduce wake, comprising the steps of:
wind generated in the rotation process of the blades is rectified after passing through the silk screen, so that wake flow loss is reduced.
The invention is further improved in that: the method also comprises the following steps:
and driving the grid system and adjusting the distance between the grid system and the blades.
The invention is further improved in that: the method also comprises the following steps:
the grid system is driven to rotate during rotation of the blades, wherein the rotation speed of the grid system is different from the rotation speed of the blades.
Compared with the prior art, the invention has the following advantages:
1. according to the wind power generation system for reducing wake flow by utilizing the grid, wind flowing through the wind wheel is rectified through the grid system arranged behind the wind wheel, so that the turbulence degree of wind at the downstream of the wind wheel is reduced, and the operation safety of a wind generating set is improved.
2. According to the wind power generation system for reducing wake flow by utilizing the grating, wake flow loss of a wind power generation field can be obviously reduced by reducing wake flow by utilizing the grating, and the generated energy of the wind power generation field is improved.
3. According to the wind power generation system for reducing wake flow by utilizing the grating, the wake flow is reduced by utilizing the grating, and the interval between adjacent wind power generating sets can be reduced, so that the engineering cost is reduced, and the land utilization rate is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a front view of a wind power generation system for reducing wake flow using a grid in accordance with embodiment 1 of the present invention;
FIG. 2 is a side view of a wind power generation system utilizing a grid to reduce wake in accordance with embodiment 1 of the present invention;
FIG. 3 is a side view of a wind power generation system utilizing a grid to reduce wake in accordance with embodiment 2 of the present invention;
FIG. 4 is a front view of a wind power generation system for reducing wake flow using a grid according to embodiment 3 of the present invention;
fig. 5 is a side view of a wind power generation system for reducing wake flow using a grid according to embodiment 3 of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Example 1
Referring to fig. 1-2, the present invention provides a wind power generation system for reducing wake flow using a grid, comprising a grid system 10, a rotor system and a nacelle 20 tower 21.
Nacelle 20 is fixed atop tower 21; the wind turbine system comprises blades 6 and a hub 7, the three blades 6 being mounted on the hub 7, the hub 7 being mounted at the front end of the nacelle 20 by means of a rotating shaft.
The grid system 10 is arranged on the nacelle 20 at the wind direction rear end of the blades 6. The grid system 10 comprises a plurality of fixing rings, wherein each fixing ring comprises an outermost outer ring 1, an innermost inner ring 2 and a middle fixing ring in the middle; the diameter of the middle fixing ring is sequentially reduced from outside to inside; the outer ring 1, the intermediate retainer ring and the inner ring 2 are radially connected by a plurality of spokes 5 such that a plurality of trapezoid-like gratings 3 are formed in the grating system 10, with the wire mesh 4 installed in the gratings 3. The grid system 10 is fixed to the nacelle 20 by means of the inner ring 2.
The radial dimension of the outer ring 1 in the grid system 10 is larger than the length dimension of the blades 6, and the diameter dimension of the inner ring 2 is about the diameter of the blade root of the blades 6.
The grid system 10 is located at a distance of 3-8 meters from the blade 6.
The area of the single through holes of the wire mesh 4 in the grid system is less than or equal to 25 square centimeters.
Example 2
Referring to fig. 3, in embodiment 1, a horizontal rail 201 is provided on a nacelle 20 according to embodiment 2; the inner ring 2 is provided with a guide groove matched with the horizontal guide rail 201; the nacelle 20 is provided with a driving mechanism 22, the movable end of the driving mechanism is connected with the inner ring 2, and the driving mechanism is used for driving the inner ring 2 to drive the whole grid system 10 to move along the horizontal guide rail 201 so as to adjust the distance between the grid system 10 and the blades 6, thereby changing the distance between the grid system 10 and the blades 6 along with the change of wind speed.
The drive mechanism 22 is a hydraulic mechanism or a cylinder.
Example 3
Referring to fig. 4 and 5, in embodiment 1 or embodiment 2, the inner race 2 in embodiment 3 is mounted on the horizontal rail 201 of the nacelle 20 by bearings. The bearing comprises an inner layer 31 and an outer layer 32; the inner layer 31 is internally provided with a groove matched with the horizontal guide rail 201, and the outer layer 32 is fixedly connected with the inner ring 2; between the inner layer 31 and the outer layer 32 are balls or graphite for lubrication.
A circle of teeth are arranged on the inner ring 2; the wind power generation system for reducing wake flow by using the grille of the invention further comprises a driving motor 23 which is matched with teeth on the inner ring 2. The rotation shaft of the drive motor 23 is provided with a drive gear which is engaged with teeth on the inner ring 2. The driving motor 23 can drive the inner ring 2 to drive the bearing to rotate through the driving gear, so that the whole grid system 10 is driven to rotate around the engine room 20, and wake loss is reduced more remarkably.
Example 4
The invention discloses a working method of a wind power generation system for reducing wake flow by utilizing a grid, which comprises the following steps of:
wind generated in the rotation process of the blades 6 is rectified after passing through the silk screen 4, so that wake flow loss is reduced;
according to the wind speed, the grid system 10 is driven to move along the horizontal guide rail 201 by the driving mechanism 22, and the distance between the grid system 10 and the blades 6 is adjusted;
according to the working condition, the grid system 10 is driven to rotate by the driving motor 23, so that wake loss is further reduced.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (7)
1. A wind power generation system for reducing wake flow using a grid, comprising: a grid system (10), a wind wheel system and a nacelle (20);
the wind wheel system comprises blades (6) and a hub (7), wherein the blades (6) are arranged on the hub (7), and the hub (7) is arranged at the front end of the engine room (20) through a rotating shaft;
the grid system (10) is arranged on the engine room (20) and is positioned at the wind direction rear end of the blade (6); a silk screen (4) is arranged on the grid system (10);
the grid system (10) comprises a plurality of fixing rings, wherein each fixing ring comprises an outermost outer ring (1), an innermost inner ring (2) and a middle fixing ring; the diameter of the middle fixing ring is sequentially reduced from outside to inside; the outer ring (1), the middle fixing ring and the inner ring (2) are radially connected through a plurality of spokes (5), so that a plurality of trapezoid-like grids (3) are formed in the grid system (10), and a silk screen (4) is arranged in the grids (3);
a horizontal guide rail (201) is arranged on the engine room (20); the inner ring (2) is provided with a guide groove matched with the horizontal guide rail (201); the cabin (20) is provided with a driving mechanism (22), the movable end of the driving mechanism is connected with the inner ring (2), and the inner ring (2) can be driven to drive the whole grid system (10) to move along the horizontal guide rail (201);
the grid system (10) is fixed to the nacelle (20) by means of the inner ring (2).
2. Wind power system with a grid for wake reduction according to claim 1, characterized in that the radius of the outer ring (1) in the grid system (10) is larger than the length of the blades (6).
3. Wind power system according to claim 1, wherein the drive mechanism (22) is a hydraulic mechanism or a cylinder.
4. Wind power system for reducing wake by means of a grid according to claim 1, characterized in that the inner ring (2) is bearing mounted on a horizontal rail (201) of the nacelle (20);
the bearing comprises an inner layer (31) and an outer layer (32) which are in sliding fit with each other; the inner layer (31) is internally provided with a groove matched with the horizontal guide rail (201), and the outer layer (32) is fixedly connected with the inner ring (2);
a circle of teeth are arranged on the inner ring (2); the wind power generation system for lowering wake flow by utilizing the grille further comprises a driving motor (23) matched with teeth on the inner ring (2); the rotating shaft of the driving motor (23) is provided with a driving gear which is meshed with the teeth on the inner ring (2).
5. A method of operating a wind power system for reducing wake flow with a grid, characterized in that the wind power system for reducing wake flow with a grid according to any of claims 1 to 4 is based on the steps of:
wind generated in the rotation process of the blades (6) is rectified after passing through the silk screen (4), so that wake flow loss is reduced.
6. The method of operation of claim 5, further comprising the steps of:
the grid system (10) is driven, and the distance between the grid system (10) and the blade (6) is adjusted.
7. The method of operation of claim 5, further comprising the steps of:
the grid system (10) is driven to rotate during rotation of the blades, wherein the rotation speed of the grid system (10) is different from the rotation speed of the blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110536810.9A CN113074092B (en) | 2021-05-17 | 2021-05-17 | Wind power generation system and method for reducing wake flow by utilizing grille |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110536810.9A CN113074092B (en) | 2021-05-17 | 2021-05-17 | Wind power generation system and method for reducing wake flow by utilizing grille |
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| Publication Number | Publication Date |
|---|---|
| CN113074092A CN113074092A (en) | 2021-07-06 |
| CN113074092B true CN113074092B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110536810.9A Active CN113074092B (en) | 2021-05-17 | 2021-05-17 | Wind power generation system and method for reducing wake flow by utilizing grille |
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| CN (1) | CN113074092B (en) |
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2021
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| JPS5848800A (en) * | 1981-09-18 | 1983-03-22 | Hitachi Ltd | Axial flow type hydraulic machine |
| CN101230833A (en) * | 2007-12-13 | 2008-07-30 | 黄金伦 | Lower wind mill of generator |
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| CN202021551U (en) * | 2011-04-27 | 2011-11-02 | 重庆大有表面技术有限公司 | General shot blasting and descaling tool for bolts |
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| WO2018177493A1 (en) * | 2017-03-28 | 2018-10-04 | Vestas Wind Systems A/S | Wind turbine including wake flow reducing structures and method of using same |
| KR102170798B1 (en) * | 2019-08-29 | 2020-10-27 | 주식회사 씨엔스카이텍 | Hihg-power generating vortex windmill wing |
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| CN113074092A (en) | 2021-07-06 |
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