CN105545583A - Wind turbine blade and determination method for dip angle of outflow tangent line of leeside - Google Patents
Wind turbine blade and determination method for dip angle of outflow tangent line of leeside Download PDFInfo
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- CN105545583A CN105545583A CN201610151248.7A CN201610151248A CN105545583A CN 105545583 A CN105545583 A CN 105545583A CN 201610151248 A CN201610151248 A CN 201610151248A CN 105545583 A CN105545583 A CN 105545583A
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- 238000010248 power generation Methods 0.000 claims description 69
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- 238000013461 design Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
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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
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
-
- 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
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention relates to the technical field of wind driven generators, in particular to a wind turbine blade and a determination method for the dip angle of an outflow tangent line of a leeside. The wind turbine blade comprises a windward side and the leeside, the minimum rotating resistance of the leeside to the blade is adopted as a target, and the dip angle of the outflow tangent line of the leeside is determined as the formula shown in the description based on the flow continuity principle, the theorem of momentum and the geometrical relationship, wherein Va1 is inflow speed, Ve2 is the rotating line speed of the wind outlet point of the leeside, N is the number of wind turbine blades, l is the width of the wind turbine blade at the wind outlet point of the leeside, and r is the radius of a circle where the wind outlet point of the leeside is located. The acting force of air on the wind turbine blade is in the direction of the rotating axis of the wind turbine blade, and therefore air basically generates no resisting moment on rotation of the wind turbine blade, air power is fully achieved, the capacity of the wind turbine blade to convert the energy of flowing air into blade rotating energy is improved, and the utilization rate of wind energy is increased.
Description
Technical field
The present invention relates to technical field of wind power generator, especially relate to the defining method that a kind of wind power generation blade and lee face go out to flow tangent line inclination angle.
Background technique
The working principle of Wind turbines is mechanical energy by blade by wind energy transformation, by connection sets such as wheel hub, axle and gear-boxes, mechanical energy is passed to wind-driven generator again, finally become electric energy to transfer to electrical network for user changes mechanical energy by generator, therefore blade is one of core component of Wind turbines.
At present, mostly wind power generation blade is to continue to use that aircraft wing grows up, the design process of turbines vane is formed along blade exhibition vector product is folded according to certain torsional angle, chord length and thickness distribution aerofoil profile, so the aeroperformance quality of aerofoil profile has important impact to the wind energy power of catching of Wind turbines, directly determine the wind energy utilization efficiency of Wind turbines.In the past few decades, wind-driven generator pool-size is little, wind energy utilization efficiency is low, again because the factor such as corrosion of the attachment of foozle, sandstone and dust friction, insect remains, air and rainwater causes the increase of blade inlet edge surface roughness, traditional airfoil twists into turbulent flow along with the boundary layer, increase aerofoil profile leading edge place of front edge roughness is turned by laminar flow in advance under large attack angle, boundary layer, face, aerofoil profile top is separated too early, causes blade maximum lift coefficient degradation.
Along with the continuous increase of Wind turbines capacity, traditional airfoil has been difficult to the designing requirement meeting modern wind machine, in order to reduce energy loss, the country such as the U.S., Holland, Denmark, Sweden as far back as 20th century the eighties just start to carry out the aerofoil profile exploitation of Wind turbines.Blade external at present generally have employed Special Airfoil of Wind Turbine, not only increases the efficiency of Wind turbines, and reduces blade processing cost, reduces noise, and the good stalling characteristics of aerofoil profile are advantageously in the control of Wind turbines.Domestic new aerofoil design studies is started late, and lacks design data and the aerodynamic data of new aerofoil, the serious design level that have impact on state's intra vane.
China is the country that wind energy resources enriches, according to the data of China Meterological Science Research Institute's estimation, China is about 1,000,000,000 kW at the wind resource developed of 10m low latitude scope, wherein landly be about 2.53 hundred million kW, if expand to the height of more than 50-60m, wind resource will be twice at least again in expansion.And domestic wind resource mainly concentrates on three northern areas of China and East Coastal area, provides good condition to large-scale development and utilization.Rapidly, in 2006 ~ 2008 years continuous 3 years, total installation of generating capacity growth rate all remains on more than 100% to China's Wind Power Generation Industry nearly decades development, develops so rapidly and also brings some technical problem demanding prompt solutions.
At present still be in the exploratory stage to the research that air stream (wind) active role makes wind wheel rotate in blade, Europe is relative with U.S. locations quality poor relatively for the wind-resources of China, most area annual mean wind speed is lower, and the unit of external import is extensively installed in domestic wind energy turbine set, there is the problems such as large, the specified operating air velocity of wind turbines rotor threshold wind velocity is high, wind energy utilization is low, make the wind energy conversion system of these imports all occur power coefficient lower than design load, annual electricity generating capacity lower than the phenomenon of external testing level in China.
Summary of the invention
A kind of wind power generation blade and lee face is the object of the present invention is to provide to go out to flow the defining method at tangent line inclination angle, give full play to aerodynamic force, to improve blade of wind-driven generator by the ability of the Conversion of Energy of moving air for blade rotation energy, improve wind energy utilization.
Wind power generation blade provided by the invention, comprises windward side and lee face, if lee face goes out to flow tangent line inclination angle is
and
wherein, V
a1for the wind speed that becomes a mandarin, V
e2for the linear velocity (i.e. velocity of moving space) of lee face air-out point, N is the quantity of wind power generation blade, and l is the wind power generation blade width at lee face air-out point place, and r is lee face air-out point place radius of a circle.
Further, described lee face goes out to flow the angle between lee face air-out point tangent direction and the linear velocity opposite direction of this lee face air-out point that tangent line inclination angle is a certain cross section end of described wind power generation blade.
Further, become a mandarin described in wind speed V
a1direction perpendicular to the plane of rotation of described wind power generation blade.
Further, linear velocity (velocity of moving space) V of described lee face air-out point
e2calculated by the rated power of wind-driven generator.
The lee face of described wind power generation blade provided by the invention goes out to flow the defining method at tangent line inclination angle, comprises the following steps:
Set up lee face and go out to flow tangent line inclination angle
the absolute discharge velocity V of lee face air-out point
a2, lee face air-out point linear velocity (velocity of moving space) V
e2and the relative discharge velocity V of lee face air-out point
r2between relation; Wherein, the absolute discharge velocity V of described lee face air-out point
a2direction perpendicular to the plane of rotation of described wind power generation blade, wind power generation blade is rotated to the inhibition produced with the air eliminating wind power generation blade lee face;
Set up the absolute discharge velocity V of lee face air-out point
a2with the wind speed V that becomes a mandarin
a1between relation;
Set up described lee face and go out to flow tangent line inclination angle
about the linear velocity V of described lee face air-out point
e2and described in become a mandarin wind speed V
a1equation; Due to the linear velocity V of described lee face air-out point
e2can be calculated by the rated power of wind-driven generator, described in become a mandarin wind speed V
a1for rating value, lee face can be tried to achieve and go out to flow tangent line inclination angle
Further, according to the relative motion relation of described wind power generation blade and air, the absolute discharge velocity V of known described lee face air-out point
a2for the linear velocity V of this point
e2with relative discharge velocity V
r2vector, obtain according to vector calculus relation
Further, the absolute discharge velocity V of described lee face air-out point
a2with the described wind speed V that becomes a mandarin
a1between relation according to Flow continuity establishing equation, i.e. 2 π rdrV
a1=(2 π r-Nl) drV
a2, wherein, N is the quantity of wind power generation blade, and l is the wind power generation blade width at lee face air-out point place, and r is lee face air-out point place radius of a circle.
Further, set up described lee face and go out to flow tangent line inclination angle
about the linear velocity V of described lee face air-out point
e2and described in become a mandarin wind speed V
a1equation:
Further, described lee face goes out to flow the angle between lee face air-out point tangent direction and the linear velocity opposite direction of this lee face air-out point that tangent line inclination angle is a certain cross section end of described wind power generation blade.
Further, become a mandarin described in wind speed V
a1direction perpendicular to the plane of rotation of described wind power generation blade.
Beneficial effect of the present invention is:
The axial direction that blade lee face air rotates along wind power generation blade the active force of wind power generation blade, it is made substantially not produce resistance and resisting moment to the rotation of its wind power generation blade, aerodynamic force obtains and gives full play to, thus improve the ability that the Conversion of Energy of moving air is blade rotation energy by wind power generation blade, improve wind energy utilization.
The toggle speed of wind power generation blade of the present invention is less, can be widely used in the low wind speed region of most of China annual mean wind speed at 5m/s ~ 7.5m/s.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The plan view of the wind turbines rotor that Fig. 1 provides for the embodiment of the present invention;
Rotating speed and the air velocity decomposing schematic representation of Fig. 2 to be wind power generation blade radius be lee face air-out point of the cross section of r.
Embodiment
Be clearly and completely described technological scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
The plan view of the wind turbines rotor that Fig. 1 provides for the embodiment of the present invention; Rotating speed and the air velocity decomposing schematic representation of Fig. 2 to be wind power generation blade radius be lee face air-out point of the cross section of r.
As depicted in figs. 1 and 2, air draught blows to wind power generation blade from substantially horizontal, namely air enter the plane of rotation of flow path direction perpendicular to wind power generation blade, the setting wind speed that becomes a mandarin is V
a1.
Wind power generation blade 1 rotates under the promotion of air draught in vertical plane, namely on wind power generation blade 1 direction of the linear velocity of any point all with the wind speed V that becomes a mandarin
a1direction vertical.Wind power generation blade 1 comprises windward side 11 and lee face 12, the cross section being r for radius on some wind power generation blades 1, and its lee face air-out point is designated as an A, and the linear velocity of set point A (transport motion speed or velocity of moving space) is V
e2.
After air flow to the windward side 11 of wind power generation blade 1, promote wind power generation blade 1 and rotate, making lee face air-out point A have linear velocity is V
e2, air flows out from lee face air-out point A, and its relative discharge velocity (namely air is relative to the rate of outflow of wind power generation blade 1) is designated as V
r2, and V
r2with vertical plane, there is angle
namely lee face goes out to flow tangent line inclination angle.Specifically, lee face goes out to flow tangent line inclination angle
for the angle between lee face air-out point A tangent direction and the linear velocity opposite direction of some A.
The relative discharge velocity V of lee face air-out point A
r2with this transport motion speed V
e2vector be the absolute discharge velocity V of lee face air-out point
a2vector.
Because the air of the lee face 12 of wind power generation blade 1 can play inhibition to the rotation of wind power generation blade 1, minimum for making this inhibition drop to, just need power that the air of the lee face 12 flowing through wind power generation blade 1 produces perpendicular to wind wheel plane of rotation, therefore, the absolute discharge velocity V of lee face air-out point
a2(V during plane of rotation perpendicular to wind power generation blade 1
a2direction and V
a1identical), go out to flow the rotary motion of air to wind power generation blade 1 and do not produce retardation, the utilization ratio of wind power generation blade 1 pair of wind energy can be improved.
From geometrical relationship, in Δ ACD:
Formula (1) is substituted into formula (2), obtains:
According to Flow continuity equation, can obtain:
2πrdrV
a1＝(2πr-Nl)drV
a2(4)
Wherein, N is the quantity of wind power generation blade, and l is the wind power generation blade width at air-out point place, and r is air-out point place radius of a circle.
So, can obtain:
Formula (5) is substituted into formula (3), and arrangement obtains:
So, can obtain:
Now, the active force that the air flowing through wind power generation blade point A is subject to is:
wherein ρ is air density, and q is the volume of air flowing through wind power generation blade.
According to action and reaction law, now the amount of force of air to wind power generation blade 1 is equal with F, and direction is contrary, i.e. the wind power generation blade of design like this, and the air of lee face does not substantially rotate it and produces resisting moment (because of V
a1, V
a2all along wind wheel rotor shaft direction, F is also along wind wheel rotor shaft direction, and its component in wind wheel plane of rotation is zero), aerodynamic force obtains and gives full play to, thus improve the ability that the Conversion of Energy of moving air is wind wheel rotational energy by wind power generation blade, improve wind energy utilization.
Be described with a specific embodiment below:
The quantity N=3 of wind power generation blade, (namely become a mandarin rated wind speed wind speed V
a1) be 7.5m/s, the rated power of wind-driven generator is 25kw, and on a certain wind power generation blade, each lee face air-out point goes out to flow tangent line inclination angle
as shown in table 1, wherein, the wind power generation blade width l at each air-out point place is obtained by actual measurement, the linear velocity V of air-out point
e2calculated by the rated power of wind-driven generator.
Table 1: lee face air-out point go out to flow tangent line inclination angle
According to the wind power generation blade of upper table design, relative to the existing blade under equal conditions, wind energy utilization can improve 9 ~ 13%.
Last it is noted that above each embodiment is only in order to illustrate technological scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technological scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristics; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technological scheme.
Claims (10)
1. a wind power generation blade, comprises windward side and lee face, it is characterized in that, if lee face goes out to flow tangent line inclination angle is
and
wherein, V
a1for the wind speed that becomes a mandarin, V
e2for the linear velocity of lee face air-out point, N is the quantity of wind power generation blade, and l is the wind power generation blade width at lee face air-out point place, and r is lee face air-out point place radius of a circle.
2. wind power generation blade according to claim 1, it is characterized in that, described lee face goes out to flow the angle between lee face air-out point tangent direction and the linear velocity opposite direction of this lee face air-out point that tangent line inclination angle is a certain cross section end of described wind power generation blade.
3. wind power generation blade according to claim 1, is characterized in that, described in become a mandarin wind speed V
a1direction perpendicular to the plane of rotation of described wind power generation blade.
4. wind power generation blade according to claim 1, is characterized in that, the linear velocity V of described lee face air-out point
e2calculated by the rated power of wind-driven generator.
5. the lee face of wind power generation blade goes out to flow the defining method at tangent line inclination angle, it is characterized in that, comprises the following steps:
Set up lee face and go out to flow tangent line inclination angle
the absolute discharge velocity V of lee face air-out point
a2, lee face air-out point linear velocity V
e2and the relative discharge velocity V of lee face air-out point
r2between relation; Wherein, the absolute discharge velocity V of described lee face air-out point
a2direction perpendicular to the plane of rotation of described wind power generation blade, wind power generation blade is rotated to the inhibition produced with the air eliminating wind power generation blade lee face;
Set up the absolute discharge velocity V of lee face air-out point
a2with the wind speed V that becomes a mandarin
a1between relation;
Set up described lee face and go out to flow tangent line inclination angle
about the linear velocity V of described lee face air-out point
e2and described in become a mandarin wind speed V
a1equation; Due to the linear velocity V of described lee face air-out point
e2can be calculated by the rated power of wind-driven generator, described in become a mandarin wind speed V
a1for rating value, lee face can be tried to achieve and go out to flow tangent line inclination angle
6. lee face according to claim 5 goes out to flow the defining method at tangent line inclination angle, it is characterized in that,
According to the relative motion relation of described wind power generation blade and air, the absolute discharge velocity V of known described lee face air-out point
a2for the linear velocity V of this point
e2with relative discharge velocity V
r2vector, obtain according to vector calculus relation
7. lee face according to claim 6 goes out to flow the defining method at tangent line inclination angle, it is characterized in that, the absolute discharge velocity V of described lee face air-out point
a2with the described wind speed V that becomes a mandarin
a1between relation according to Flow continuity establishing equation, i.e. 2 π rdrV
a1=(2 π r-Nl) drV
a2, wherein, N is the quantity of wind power generation blade, and l is the wind power generation blade width at lee face air-out point place, and r is lee face air-out point place radius of a circle.
8. lee face according to claim 7 goes out to flow the defining method at tangent line inclination angle, it is characterized in that, sets up described lee face and goes out to flow tangent line inclination angle
about the linear velocity V of described lee face air-out point
e2and described in become a mandarin wind speed V
a1equation:
9. the lee face according to any one of claim 5 ~ 8 goes out to flow the defining method at tangent line inclination angle, it is characterized in that, described lee face goes out to flow the angle between lee face air-out point tangent direction and the linear velocity opposite direction of this lee face air-out point that tangent line inclination angle is a certain cross section end of described wind power generation blade.
10. the lee face according to any one of claim 5 ~ 8 goes out to flow the defining method at tangent line inclination angle, it is characterized in that, described in become a mandarin wind speed V
a1direction perpendicular to the plane of rotation of described wind power generation blade.
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|---|---|---|---|
| CN201610151248.7A CN105545583B (en) | 2016-03-16 | 2016-03-16 | Wind power generation blade and lee face go out to flow the determination method at tangent line inclination angle |
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|---|---|---|---|
| CN201610151248.7A CN105545583B (en) | 2016-03-16 | 2016-03-16 | Wind power generation blade and lee face go out to flow the determination method at tangent line inclination angle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837683A (en) * | 2017-04-21 | 2017-06-13 | 华北电力大学 | The optimal value for going out to flow tangent line inclination angle of blade, wind wheel and windward side determines method |
| CN108397344A (en) * | 2018-01-25 | 2018-08-14 | 华北电力大学 | The determination method of wind power generation blade pitch angle |
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| DE2746189A1 (en) * | 1977-10-14 | 1979-04-19 | Karl Friedel | Wind generator aerofoil blade mfr. - by drawing resin impregnated glass or carbon fibre woven hose over core and foaming interior with polyurethane on core removal |
| US20100014970A1 (en) * | 2007-01-05 | 2010-01-21 | Lm Glasfiber A/S | Wind turbine blade with lift-regulating means in form of slots or holes |
| CN102072080A (en) * | 2011-01-18 | 2011-05-25 | 华北电力大学 | High-performance blade of wind turbine |
| CN102278272A (en) * | 2011-09-02 | 2011-12-14 | 吉林大学 | Protrusive horizontal shaft wind turbine blade |
| CN104314770A (en) * | 2014-09-26 | 2015-01-28 | 东方电气集团东方汽轮机有限公司 | Wind turbine blade with trailing edge flat plate |
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2016
- 2016-03-16 CN CN201610151248.7A patent/CN105545583B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2746189A1 (en) * | 1977-10-14 | 1979-04-19 | Karl Friedel | Wind generator aerofoil blade mfr. - by drawing resin impregnated glass or carbon fibre woven hose over core and foaming interior with polyurethane on core removal |
| US20100014970A1 (en) * | 2007-01-05 | 2010-01-21 | Lm Glasfiber A/S | Wind turbine blade with lift-regulating means in form of slots or holes |
| CN102072080A (en) * | 2011-01-18 | 2011-05-25 | 华北电力大学 | High-performance blade of wind turbine |
| CN102278272A (en) * | 2011-09-02 | 2011-12-14 | 吉林大学 | Protrusive horizontal shaft wind turbine blade |
| CN104314770A (en) * | 2014-09-26 | 2015-01-28 | 东方电气集团东方汽轮机有限公司 | Wind turbine blade with trailing edge flat plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837683A (en) * | 2017-04-21 | 2017-06-13 | 华北电力大学 | The optimal value for going out to flow tangent line inclination angle of blade, wind wheel and windward side determines method |
| CN108397344A (en) * | 2018-01-25 | 2018-08-14 | 华北电力大学 | The determination method of wind power generation blade pitch angle |
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| Publication number | Publication date |
|---|---|
| CN105545583B (en) | 2018-03-20 |
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