CN111810352A - Wind gathering and effect improving device of low-wind-speed wind turbine - Google Patents
Wind gathering and effect improving device of low-wind-speed wind turbine Download PDFInfo
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- CN111810352A CN111810352A CN202010751685.9A CN202010751685A CN111810352A CN 111810352 A CN111810352 A CN 111810352A CN 202010751685 A CN202010751685 A CN 202010751685A CN 111810352 A CN111810352 A CN 111810352A
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- 230000000694 effects Effects 0.000 title claims abstract description 37
- 230000004323 axial length Effects 0.000 claims abstract description 25
- 230000007704 transition Effects 0.000 claims abstract description 4
- 230000002708 enhancing effect Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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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
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/04—Wind motors with rotation axis substantially parallel to the air flow entering the rotor having stationary wind-guiding means, e.g. with shrouds or channels
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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
- F05B2250/00—Geometry
- F05B2250/10—Geometry two-dimensional
- F05B2250/17—Geometry two-dimensional hyperbolic
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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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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)
- Wind Motors (AREA)
Abstract
The invention relates to a wind gathering and effect improving device of a low-wind-speed wind turbine, which comprises a wind gathering cover and a connecting piece, wherein the wind gathering cover and the connecting piece are sleeved on the outer side of a wind turbine main body and are arranged on a wind turbine tower through the connecting piece; the wind-collecting cover is cylindrical and comprises a first part and a second part which are in smooth transition, the first part is gradually reduced from the inlet to the outlet, the second part is gradually expanded from the inlet to the outlet, the diameter of the outlet side of the first part is consistent with that of the inlet side of the second part, and the axial length of the first part is larger than that of the second part. Compared with the prior art, the wind turbine adopts the cylindrical wind gathering cover, and the wind turbine can improve the efficiency of the wind turbine in a mode of reducing gradually and then expanding gradually.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a wind-gathering efficiency-improving device of a low-wind-speed wind turbine.
Background
China has rich wind energy resource reserves, but at present, wind energy is wasted because effective development and utilization are not realized in low wind speed areas with wind energy development values. The area accounts for about 68% of the wind energy exploitable area of China, and is mainly concentrated in the wide areas of the middle east and the south of China. With the saturation of the development of domestic high wind speed wind fields, the development center of gravity of wind power gradually shifts to the vast low wind speed wind fields with development value. However, the wind energy density in low wind speed areas is low, so that the wind turbine is difficult to work efficiently for a long time.
In order to gather wind energy in low wind speed areas, some methods have been used, chinese patent CN204344379U discloses a large wind-gathering power generation device, which can keep high power generation efficiency when the wind speed is low by arranging a wind-gathering cover at the periphery of a power generation chassis, and chinese patent CN105257480A discloses a wind power generation device for tracking wind gathering, which can track the wind direction through a base support rotating shaft and gather wind to generate power. However, these devices are complicated in construction and require an increased size of the device to gather wind power.
Disclosure of Invention
The invention aims to provide a wind gathering and effect improving device of a low-wind-speed wind turbine.
The purpose of the invention can be realized by the following technical scheme:
a wind gathering and effect improving device of a low-wind-speed wind turbine comprises a wind gathering cover and a connecting piece, wherein the wind gathering cover and the connecting piece are sleeved on the outer side of a wind turbine main body and are arranged on a wind turbine tower through the connecting piece;
the wind-collecting cover is cylindrical and comprises a first part and a second part which are in smooth transition, the first part is gradually reduced from an inlet to an outlet, the second part is gradually expanded from the inlet to the outlet, the diameter of the outlet side of the first part is consistent with that of the inlet side of the second part, and the axial length of the first part is greater than that of the second part.
Further, the axial section of the wind gathering cover is hyperbolic.
Further, the axial length of the first part is 2.5-6 times of the axial length of the second part.
Further, the axial length of the first portion is 3 to 6 times the axial length of the second portion.
Still further, the axial length of the first portion is 5 times the axial length of the second portion.
Furthermore, the wind-gathering cover also comprises an annular wind shield which is connected to the outlet of the second part and used for forming a low-pressure area so as to continuously suck air and enhance the effect of gathering wind and improving efficiency.
Still further, the annular wind deflector has an outer diameter greater than the maximum outer diameter of the first portion.
Further, the mathematical expression of the hyperbola is:
wherein: x and y are coordinates of points on a hyperbola, a and b are parameters of the hyperbola, a is (0.5-0.6) D0, b is (0.25-0.35) D0, and D0 is the diameter of the rotor of the low-wind-speed wind turbine.
Still further, the parameters of the hyperbola are specifically: d0 (0.52-0.55) and D0 (0.28-0.31).
Still further, the axial length of the first portion is (0.2-0.3) D0.
Compared with the prior art, the invention has the following beneficial effects:
1) the cylindrical wind gathering cover is adopted, and the wind turbine can improve the efficiency by means of reducing gradually and then expanding gradually.
2) The device is formed by turning a part of curve of a hyperbola, is smooth and has small flow resistance.
3) The wind gathering efficiency improving device is designed aiming at the individuation of the low wind speed wind turbine, and has good effect of improving the power and the efficiency of the low wind speed wind turbine.
4) The wind-gathering effect-improving device is simple in structure and convenient to operate.
Drawings
FIG. 1 is a schematic structural view of a wind collecting cover and an annular wind shielding plate according to the present invention;
FIG. 2 is a schematic representation of a hyperbola;
FIG. 3 is a side view of the wind collecting cover and the annular wind deflector portion;
FIG. 4 is a pressure cloud chart of the upper surface of a wind wheel without a wind gathering and effect improving device;
FIG. 5 is a pressure cloud chart of the lower surface of a wind wheel without a wind gathering and effect improving device;
FIG. 6 is a pressure cloud chart of the upper surface of a wind wheel additionally provided with a wind gathering and effect improving device;
FIG. 7 is a pressure cloud chart of the lower surface of a wind wheel additionally provided with a wind gathering and effect improving device;
FIG. 8 is a vector diagram of flow field velocity around an airfoil profile at a position 30% of the blade height without a wind gathering and effect improving device;
FIG. 9 is a vector diagram of flow field velocity around an airfoil profile at a position of 30% of blade height for installing a wind-gathering effect-improving device;
FIG. 10 is a cloud diagram of the velocity distribution of the flow field after the wind gathering and effect raising device is additionally arranged;
FIG. 11 is a pressure distribution cloud chart of a flow field after a wind gathering and effect raising device is additionally arranged;
wherein: 1. a wind gathering cover 2 and an annular wind shield.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A wind gathering and effect improving device of a low-wind-speed wind turbine comprises a wind gathering cover 1 and a connecting piece, wherein the wind gathering cover 1 and the connecting piece are sleeved on the outer side of the wind turbine and are arranged on a tower of the wind turbine through the connecting piece; the wind collecting cover 1 is cylindrical and comprises a first part and a second part which are in smooth transition, wherein the first part is gradually reduced from an inlet to an outlet, the second part is gradually expanded from the inlet to the outlet, the diameter of the outlet side of the first part is consistent with that of the inlet side of the second part, and the axial length of the first part is greater than that of the second part. The inlet flow channel with a larger cross section and the reduced flow channel are adopted to collect wind resources, improve the wind speed in front of the wind wheel, improve the wind speed in the device through the combined action of the diffusion flow channel at the rear side of the wind wheel and achieve the effect of speed increase.
The center of the wind turbine rotating shaft is located at the junction of the first part and the second part, the axial length of the first part is 2.5-6 times of the axial length of the second part, preferably, the axial length of the first part is 3-6 times of the axial length of the second part, and the axial length of the first part is 5 times of the axial length of the second part.
In this embodiment, the axial cross section of the wind collecting cover 1 is hyperbolic as shown in fig. 2, and the curved surface strength is high, so that the wall thickness of the device can be greatly reduced, and the total weight of the device can be reduced. As shown in fig. 1 and 3, the wind gathering cover 1 further includes an annular wind deflector 2, the annular wind deflector 2 is connected to the outlet of the second portion and is used for forming a low-pressure area so as to further suck air and enhance the effect of wind gathering and improving the effect, and the outer diameter of the annular wind deflector 2 is larger than the maximum outer diameter of the first portion.
The mathematical expression of the hyperbola is:
wherein: x and y are coordinates of points on a hyperbola, a and b are parameters of the hyperbola, a is (0.5-0.6) D0, b is (0.25-0.35) D0, and D0 is the diameter of the rotor of the low-wind-speed wind turbine. The parameters of the hyperbola are specifically: d0 (0.52-0.55), D0 (0.28-0.31), and D0 (0.2-0.3). The rotating plane of the wind wheel is vertical to the rotating shaft and is positioned at the position where X is equal to 0. The axial length of the second partial diffuser section behind the wind wheel is (0.05-0.08) D0, and the width of the outlet annular wind deflector 2 is (0.1-0.15) D0.
By adopting a certain low-wind-speed wind turbine to carry out numerical calculation, the output power of the wind wheel is increased by 43% after the wind gathering and efficiency improving device designed by the application is additionally arranged, and the wind gathering and efficiency improving device is shown to be capable of effectively improving the output power of the low-wind-speed wind turbine. Correspondingly, the efficiency of the low-speed wind turbine is improved by 43 percent under the condition that the wind speed of the wind wheel at infinity is the same.
Fig. 4 and 5 show pressure clouds of the upper surface and the lower surface of a wind wheel without a wind gathering and effect improving device, and fig. 6 and 7 show pressure clouds of the upper surface and the lower surface of the wind wheel with the wind gathering and effect improving device. After the wind gathering and lifting effect device is additionally arranged, the pressure of the middle part of the blade on the lower surface of the blade is obviously reduced, the pressure difference between the upper surface and the lower surface is increased, and the acting capacity of the blade is enhanced.
Fig. 8 and 9 show vector diagrams of flow field velocities around the airfoil at the position of 30% of the blade height of the front wind wheel and the rear wind wheel of the wind-gathering effect-improving device. The cross section of the blade which is not provided with the wind gathering effect improving device generates flow separation at the lower surface, so that flow loss is caused, the pressure of the lower surface of the blade is reduced, the pressure difference of the upper surface and the lower surface of the blade is reduced, and the acting effect of the blade is influenced. After the air collector is additionally arranged, the flow separation phenomenon of the lower surface of the section is obviously improved.
FIG. 10 is a cloud diagram showing the velocity distribution of the whole flow field after the wind gathering effect device is added. Under the calculation condition that the wind speed of incoming flow in front of the wind wheel is 6m/s, the wind gathering and effect improving device enables the wind speed to be obviously improved when the wind speed reaches the plane where the wind wheel is located. The wind speed can reach 9m/s at the position of the wind wheel blade; in the tip part of the blade, the wind speed can reach 11 m/s. The wind collector collects wind energy and improves wind speed.
FIG. 11 is a cloud diagram showing the pressure distribution of the whole flow field after the wind gathering effect device is added. The wind gathering and effect improving device is additionally arranged, so that wind energy can be gathered by utilizing pressure difference. An obvious low-pressure area is formed at the annular wind shield 2 at the outlet of the wind gathering and effect improving device, and air flow in a flow channel can be effectively sucked, so that the wind speed at the tip of a wind wheel blade is further improved.
Claims (10)
1. A wind gathering and effect improving device of a low-wind-speed wind turbine is characterized by comprising a wind gathering cover and a connecting piece, wherein the wind gathering cover and the connecting piece are sleeved on the outer side of a wind turbine main body and are arranged on a wind turbine tower through the connecting piece;
the wind-collecting cover is cylindrical and comprises a first part and a second part which are in smooth transition, the first part is gradually reduced from an inlet to an outlet, the second part is gradually expanded from the inlet to the outlet, the diameter of the outlet side of the first part is consistent with that of the inlet side of the second part, and the axial length of the first part is greater than that of the second part.
2. The wind gathering and efficiency improving device of the low wind speed wind turbine as claimed in claim 1, wherein the axial section of the wind gathering cover is hyperbolic.
3. The wind gathering and efficiency improving device for the low wind speed wind turbine as claimed in claim 1, wherein the axial length of the first portion is 2.5-6 times the axial length of the second portion.
4. The wind gathering and efficiency improving device for the low wind speed wind turbine as claimed in claim 3, wherein the axial length of the first portion is 3-6 times the axial length of the second portion.
5. The wind gathering and effect enhancing device for the low wind speed wind turbine as claimed in claim 4, wherein the axial length of the first portion is 5 times the axial length of the second portion.
6. The wind gathering and effect improving device of the low wind speed wind turbine as claimed in claim 1, wherein the wind gathering cover further comprises an annular wind deflector connected to the outlet of the second portion for forming a low pressure area to further suck air continuously and enhance the effect of wind gathering and effect improving.
7. The wind gathering and effect enhancing device for the low wind speed wind turbine as claimed in claim 6, wherein the outer diameter of the annular wind deflector is larger than the maximum outer diameter of the first portion.
8. The wind gathering and effect improving device of the low wind speed wind turbine as claimed in claim 2, wherein the mathematical expression of the hyperbola is as follows:
wherein: x and y are coordinates of points on a hyperbola, a and b are parameters of the hyperbola, a is (0.5-0.6) D0, b is (0.25-0.35) D0, and D0 is the diameter of the rotor of the low-wind-speed wind turbine.
9. The wind gathering and effect improving device of the low wind speed wind turbine as claimed in claim 8, wherein the parameters of the hyperbola are specifically as follows: d0 (0.52-0.55) and D0 (0.28-0.31).
10. The wind gathering and effect enhancing device for the low wind speed wind turbine as claimed in claim 9, wherein the axial length of the first portion is (0.2-0.3) D0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751685.9A CN111810352A (en) | 2020-07-30 | 2020-07-30 | Wind gathering and effect improving device of low-wind-speed wind turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751685.9A CN111810352A (en) | 2020-07-30 | 2020-07-30 | Wind gathering and effect improving device of low-wind-speed wind turbine |
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| Publication Number | Publication Date |
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| CN111810352A true CN111810352A (en) | 2020-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010751685.9A Pending CN111810352A (en) | 2020-07-30 | 2020-07-30 | Wind gathering and effect improving device of low-wind-speed wind turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115714566A (en) * | 2022-12-30 | 2023-02-24 | 四川众信通用电力有限公司 | New forms of energy power supply system based on cubical switchboard |
Citations (8)
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|---|---|---|---|---|
| GB213022A (en) * | 1923-01-03 | 1924-03-27 | Charles Esmond Nightingale | Improvements in windmills and windmotors |
| US20030178856A1 (en) * | 2002-03-22 | 2003-09-25 | Kyushu Tlo Company, Limited | Wind power generator |
| US20080150292A1 (en) * | 2006-12-21 | 2008-06-26 | Green Energy Technologies, Inc. | Shrouded wind turbine system with yaw control |
| US20130175804A1 (en) * | 2006-12-21 | 2013-07-11 | Green Energy Technologies, Llc | Wind turbine shroud and wind turbine system using the shroud |
| US20140308120A1 (en) * | 2010-07-02 | 2014-10-16 | William Joseph Komp | Air-channeled wind turbine for low-wind environments |
| CN105673316A (en) * | 2014-11-19 | 2016-06-15 | 陈清泉 | Low-altitude air collection method and device for pushing river dredging machine |
| WO2018125252A1 (en) * | 2016-12-31 | 2018-07-05 | Komp William | Hybrid air-channeled wind turbine/solar powered electrical generator for mobile utilization |
| CN212615156U (en) * | 2020-07-30 | 2021-02-26 | 上海电力大学 | Wind gathering and accelerating device of low-wind-speed wind turbine |
-
2020
- 2020-07-30 CN CN202010751685.9A patent/CN111810352A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB213022A (en) * | 1923-01-03 | 1924-03-27 | Charles Esmond Nightingale | Improvements in windmills and windmotors |
| US20030178856A1 (en) * | 2002-03-22 | 2003-09-25 | Kyushu Tlo Company, Limited | Wind power generator |
| CN1553994A (en) * | 2002-03-22 | 2004-12-08 | ��ʽ�����ѧ��Я�������� | Wind power generator |
| US20080150292A1 (en) * | 2006-12-21 | 2008-06-26 | Green Energy Technologies, Inc. | Shrouded wind turbine system with yaw control |
| US20130175804A1 (en) * | 2006-12-21 | 2013-07-11 | Green Energy Technologies, Llc | Wind turbine shroud and wind turbine system using the shroud |
| US20140308120A1 (en) * | 2010-07-02 | 2014-10-16 | William Joseph Komp | Air-channeled wind turbine for low-wind environments |
| CN105673316A (en) * | 2014-11-19 | 2016-06-15 | 陈清泉 | Low-altitude air collection method and device for pushing river dredging machine |
| WO2018125252A1 (en) * | 2016-12-31 | 2018-07-05 | Komp William | Hybrid air-channeled wind turbine/solar powered electrical generator for mobile utilization |
| CN212615156U (en) * | 2020-07-30 | 2021-02-26 | 上海电力大学 | Wind gathering and accelerating device of low-wind-speed wind turbine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115714566A (en) * | 2022-12-30 | 2023-02-24 | 四川众信通用电力有限公司 | New forms of energy power supply system based on cubical switchboard |
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