CN109026520A - Wind electricity blade, wind wheel and the method that wind electricity blade chord length is determined according to propeller pitch angle - Google Patents
Wind electricity blade, wind wheel and the method that wind electricity blade chord length is determined according to propeller pitch angle Download PDFInfo
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- CN109026520A CN109026520A CN201810841394.1A CN201810841394A CN109026520A CN 109026520 A CN109026520 A CN 109026520A CN 201810841394 A CN201810841394 A CN 201810841394A CN 109026520 A CN109026520 A CN 109026520A
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- 230000005611 electricity Effects 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000007796 conventional method Methods 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
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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
Abstract
The present invention relates to technical field of wind power generation, more particularly, to a kind of wind electricity blade, wind wheel and the method for determining wind electricity blade chord length according to propeller pitch angle.The wind electricity blade, for being mounted on the wheel hub of wind wheel, the formula of the corresponding leaf chord length l (r) in setting place on wind electricity blade are as follows:Wherein, the rotation axis of wind electricity blade is the axis of the wheel hub of wind wheel, M indicates that air flows through the opplied moment of the generated rotation axis to wind electricity blade when wind electricity blade, the density of ρ expression air, R indicates the distance between blade tip and axis of wheel hub of wind wheel of wind electricity blade, V indicates initial absolute movement speed when air stream enters at the setting of wind electricity blade, r indicates on wind electricity blade at setting the distance between axis of wheel hub of wind wheel, β indicates propeller pitch angle of the infinitesimal section of wind electricity blade on the wheel hub of wind wheel, R0Indicate the radius of the wheel hub of wind wheel.
Description
Technical field
The present invention relates to technical field of wind power generation, true more particularly, to a kind of wind electricity blade, wind wheel and according to propeller pitch angle
Determine the method for wind electricity blade chord length.
Background technique
At present wind power generation blade design use aerofoil profile, aerodynamic configuration and the design procedure of correction of the flank shape, Design of Aerodynamic Configuration because
Different airfoil profiles are selected, to make its chord length along the design of wind electricity blade radius segmentation, especially large-scale wind electricity unit, to make wind-powered electricity generation
The variation of leaf chord length is uneven, not smooth enough, this is also the reason of increasing correction of the flank shape step, in addition, also adding wind-powered electricity generation leaf
Piece manufacturing cost seriously affects the performance of the aeroperformance of wind electricity blade
Summary of the invention
The purpose of the present invention is to provide a kind of wind electricity blade, wind wheel and the sides for determining according to propeller pitch angle wind electricity blade chord length
Method, it is uneven with the variation for solving wind electricity blade chord length existing in the prior art, it is not smooth enough, increase wind electricity blade manufacture
Cost, the technical issues of seriously affecting the aeroperformance of wind electricity blade.
The present invention provides a kind of wind electricity blades, for being mounted on the wheel hub of wind wheel, on the wind electricity blade at setting
The formula of corresponding leaf chord length l (r) are as follows:
Wherein, the rotation axis of the wind electricity blade is the axis of the wheel hub of the wind wheel, and M indicates that air flows through the wind
The opplied moment of the generated rotation axis to wind electricity blade when electric blade, ρ indicate the density of air, and R indicates wind-powered electricity generation
The distance between the axis of wheel hub of the blade tip of blade and the wind wheel, V indicate that air flows at the setting of the wind electricity blade
When initial absolute movement speed, r indicate on the wind electricity blade at setting between the axis of the wheel hub of the wind wheel away from
From β indicates propeller pitch angle of the infinitesimal section of wind electricity blade on the wheel hub of the wind wheel, R0Indicate the half of the wheel hub of the wind wheel
Diameter.
In any of the above-described technical solution, further, the infinitesimal section of the wind electricity blade is on the wheel hub of the wind wheel
The sine value sin β of propeller pitch angle meet equation:
sin4β+2sin3β+sin2β+2(sinθ-1)sinβ-cos2θ=0, wherein θ indicates that air flows into the wind-powered electricity generation leaf
Angle between the axis of the wheel hub of initial relative movement speed and the wind wheel when at the setting of piece.
In any of the above-described technical solution, further, including windward side and leeward corresponding with the windward side.
The present invention also provides a kind of wind wheels, including the wind electricity blade.
It further include wheel hub further, the wind electricity blade is installed on the wheel hub in any of the above-described technical solution
On.
In any of the above-described technical solution, further, the quantity of the wind electricity blade is multiple, and multiple wind-powered electricity generations
Blade is uniformly distributed along the circumferential direction of the wheel hub.
The present invention also provides a kind of method for determining wind electricity blade chord length according to propeller pitch angle, which includes:
According to relative motion principle, initial relative movement speed when air flows through at the setting of the wind electricity blade is obtainedWherein, V indicates initial absolute movement speed when air flows at the setting of the wind electricity blade, ω
Indicate the angular velocity of rotation of wind wheel, r indicate on the wind electricity blade at setting between the axis of the wheel hub of the wind wheel away from
From；
The active force of the rotation axis to the wind electricity blade generated when flowing through the entire wind electricity blade according to air
The calculation formula of square M:
The formula that the corresponding leaf chord length l (r) in place is set on the wind electricity blade is calculated are as follows:
Wherein, the rotation axis of the wind electricity blade is the axis of the wheel hub of the wind wheel, and ρ indicates the density of air, R table
Show that the blade tip of wind electricity blade and the distance between the axis of wheel hub of the wind wheel, β indicate the infinitesimal section of wind electricity blade described
Propeller pitch angle on the wheel hub of wind wheel, R0Indicate the radius of the wheel hub of the wind wheel；θ indicates that air flows into setting for the wind electricity blade
Angle between the axis of the wheel hub of initial relative movement speed and the wind wheel when locating surely, α indicate the setting of wind electricity blade
The angle of attack at place.
Optionally, the rotary shaft to the wind electricity blade generated when flowing through the infinitesimal section of the wind electricity blade according to air
The calculation formula of line opplied moment dM:
Air is calculated and flows through the generated rotation axis to wind electricity blade when the entire wind electricity blade
The calculation formula of opplied moment M, wherein dQ indicates to flow through the air mass flow of the windward side at the infinitesimal section of the wind electricity blade；
Dq indicates to flow through the air mass flow of the leeward at the infinitesimal section of the wind electricity blade, and dq=l (r) r ω drsin β；α is indicated
The angle of attack at the setting of the wind electricity blade；Dr indicates radial direction of the infinitesimal section in the wind electricity blade of the wind electricity blade
On length.
Optionally, determination method further include: calculate the infinitesimal section of the wind electricity blade on the wheel hub of the wind wheel
The sine value sin β of propeller pitch angle, wherein the sine of propeller pitch angle of the infinitesimal section of the wind electricity blade on the wheel hub of the wind wheel
Value sin β meets equation:
sin4β+2sin3β+sin2β+2(sinθ-1)sinβ-cos2θ=0.
Optionally, initial absolute movement speed when air flows on the wind electricity blade at setting is obtained by anemometer
Degree.
Compared with prior art, the invention has the benefit that
Wind electricity blade, wind wheel and the method for determining wind electricity blade chord length according to propeller pitch angle provided by the invention are sent out in wind-force
In the identical situation of motor group nominal output, compared with the weight of the wind electricity blade of conventional method design, wind provided by the invention
The weight of electric blade is substantially reduced, and the weight of corresponding tower also can reduce, manufactured so as to effectively reduce Wind turbines,
Transport and installation cost, the Wind turbines cost designed by the present invention are reduced compared with the Wind turbines cost that traditional design method designs
About 22% to 26%.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of wind wheel provided in an embodiment of the present invention；
Fig. 2 is the cross-sectional view in Fig. 1 along line A-A；
Fig. 3 is the schematic diagram of velocity variations when air flows through the infinitesimal section of wind electricity blade in the embodiment of the present invention；
Fig. 4 is the radial section schematic diagram of wind electricity blade in the embodiment of the present invention；
Fig. 5 is that the calculated value of wind-powered electricity generation leaf chord length in the traditional design value and the present invention of wind electricity blade chord length is rotated with blade
The change curve of radius.
Icon: 101- wind electricity blade；102- wheel hub；103- wind electricity blade string；104- wind electricity blade Plane of rotation；105-
Axis.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.
The component for the embodiment of the present invention for usually describing and showing in attached drawing here can be with a variety of different configurations
To arrange and design.Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, ability
Domain those of ordinary skill every other embodiment obtained without making creative work, belongs to guarantor of the present invention
The range of shield.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Embodiment
Fig. 2 is the cross-sectional view in Fig. 1 along line A-A, and the distance that the axis apart from wheel hub is shown in FIG. 2 is at r
Propeller pitch angle, the angle of attack and the chord length of wind electricity blade；The vane pivot radius of wind electricity blade is at the setting of wind electricity blade and wind-powered electricity generation
The distance between rotation axis of blade, wherein rotation axis of the center of circle of circle corresponding to the vane pivot radius in blade
On, which is located in wind electricity blade Plane of rotation 104.
Referring to figs. 1 to 5, the embodiment of the invention provides a kind of wind electricity blades 101, for being mounted on the wheel of wind wheel
On hub 102, the formula of the corresponding leaf chord length l (r) in place is set on wind electricity blade are as follows:
Wherein, the rotation axis of wind electricity blade is the axis 105 of the wheel hub of wind wheel, when M indicates that air flows through wind electricity blade
The opplied moment namely air of the generated rotation axis to wind electricity blade flow through generated effect when entire wind electricity blade
Torque, ρ indicate the density of air, and R indicates the distance between blade tip and axis of wheel hub of wind wheel of wind electricity blade, that is, works as wind-powered electricity generation
After blade is mounted on the wheel hub of wind wheel, spacing between the axis of the wheel hub of the blade tip and wind wheel of wind electricity blade, V indicates air stream
Initial absolute movement speed namely air stream when entering at the setting of wind electricity blade enter the initial absolute of the windward side of wind electricity blade
Movement velocity, r indicate on wind electricity blade at setting the distance between axis of wheel hub of wind wheel.At the setting of wind electricity blade,
Namely position of the section at a certain radius of turn of wind electricity blade on wind electricity blade.β indicates that the infinitesimal section of wind electricity blade exists
Propeller pitch angle on the wheel hub of wind wheel, R0Indicate the radius of the wheel hub of wind wheel.Section at a certain radius of turn of wind electricity blade
Angle between wind electricity blade string 104 and blade Plane of rotation is the propeller pitch angle of the wind electricity blade at this.Wind electricity blade
The distance between axis of wheel hub of infinitesimal section and wind wheel be on wind electricity blade at setting between the axis of the wheel hub of wind wheel
Distance.
Wind electricity blade, wind wheel and the method for determining wind electricity blade chord length according to propeller pitch angle provided by the invention are sent out in wind-force
In the identical situation of motor group nominal output, compared with the weight of the wind electricity blade of conventional method design, wind provided by the invention
The weight of electric blade is substantially reduced, and the weight of corresponding tower also can reduce, manufactured so as to effectively reduce Wind turbines,
Transport and installation cost, the Wind turbines cost designed by the present invention are reduced compared with the Wind turbines cost that traditional design method designs
About 22% to 26%.
In the optional scheme of the embodiment, the sine value of propeller pitch angle of the infinitesimal section of wind electricity blade on the wheel hub of wind wheel
Sin β meets equation:
sin4β+2sin3β+sin2β+2(sinθ-1)sinβ-cos2θ=0, wherein θ indicates that air stream enters wind electricity blade
Angle between the axis of the wheel hub of initial relative movement speed when at setting and wind wheel, the i.e. side of initial relative movement speed
To the angle between axis.
It should be noted that the method for determining wind electricity blade chord length according to propeller pitch angle provided in the embodiment, it is contemplated that
The resistance situation of leeward.
In the optional scheme of the embodiment, wind electricity blade includes windward side and leeward corresponding with windward side.Air
It is flowed into from the windward side of wind electricity blade.
It include the wind electricity blade the embodiment of the invention also provides a kind of wind wheel.
In the optional scheme of the embodiment, wind wheel further includes wheel hub, and wind electricity blade is installed on wheel hub.
In the optional scheme of the embodiment, the quantity of wind electricity blade is multiple, and multiple wind electricity blades are along the circumferential direction of wheel hub
It is uniformly distributed.
The embodiment of the invention also provides a kind of method for determining wind electricity blade chord length according to propeller pitch angle, the determination method packets
Include following steps:
It establishes at the infinitesimal section that the distance between rotation axis of wind electricity blade flowed through on wind electricity blade is r windward
The equation of the air mass flow dQ in face: dQ=Vrl(r)sinαdr(1)；The corresponding leaf chord length l (r) in place is set on wind electricity blade
Indicate that it is the function about r.Wherein, in formula (1), α indicates the angle of attack at the setting of wind electricity blade；Dr indicates wind electricity blade
Length in the radial direction of the infinitesimal section in wind electricity blade；VrIndicate the initial phase pair when air flows through at the setting of wind electricity blade
Movement velocity.
According to relative motion principle, initial relative movement speed when air flows through at the setting of wind electricity blade is obtainedWherein, V indicates initial absolute movement speed when air stream enters at the setting of wind electricity blade, and ω is indicated
The angular velocity of rotation of wind wheel, r indicate on wind electricity blade at setting the distance between axis of wheel hub of wind wheel.Pass through anemometer
Obtain initial absolute movement speed when air stream enters on wind electricity blade at setting.
The air mass flow dq of the leeward at the infinitesimal section for flowing through wind electricity blade is calculated, and
Dq=l (r) r ω drsin β (2),
Wherein, dr indicates length in the radial direction of the infinitesimal section in wind electricity blade of wind electricity blade；β indicates wind electricity blade
Propeller pitch angle of the infinitesimal section on the wheel hub of wind wheel；
According to fluid momentum equation, establishes air and flow through the rotation to wind electricity blade generated when the infinitesimal section of wind electricity blade
The calculation formula of axis opplied moment dM:
Wherein, ρ indicates the density of air.
Shown in Figure 3, the rotation axis to wind electricity blade generated when air flows through the infinitesimal section of wind electricity blade is made
In derivation process with torque dM:
dM1=ρ rdQdVcos δ, dM2=ρ rdq (ω r- ω rcos β),
It is obtained by the geometrical relationship in Fig. 3,Wherein, δ indicates to flow out the wind
Between the velocity vector of the air of the infinitesimal section of the velocity vector and inflow wind electricity blade of the air of the infinitesimal section of electric blade
Variable quantity and wind electricity blade Plane of rotation between angle；DV indicates to flow out the air of the infinitesimal section of the wind electricity blade
Variable quantity between the velocity vector of the air of velocity vector and the infinitesimal section of the inflow wind electricity blade；dM1Indicate wind-powered electricity generation leaf
The kinetic moment that air at the infinitesimal section of the windward side of piece generates；dM2Indicate the sky at the infinitesimal section of the leeward of wind electricity blade
The moment of resistance that gas generates.
The axis of the wheel hub of initial relative movement speed and wind wheel when being entered at the setting of wind electricity blade according to air stream it
Between angle theta, the infinitesimal section of wind electricity blade is at the setting that the propeller pitch angle β and α on the wheel hub of wind wheel indicate wind electricity blade
The angle of attack, the geometrical relationship between three angles, it is known that,
Formula (4) are substituted into formula (3), and are arranged,
It is obtained according to formula (5), air flows through the active force of the rotation axis to wind electricity blade generated when entire wind electricity blade
Square M are as follows:
,
Wherein, the rotation axis of wind electricity blade is the axis of the wheel hub of wind wheel, and R indicates the blade tip and wind wheel of wind electricity blade
The distance between axis of wheel hub, R0Indicate that the radius of the wheel hub of wind wheel, other symbolic significances are the same.
According to formula (6), defined function F (r), and have
,
Indentily transformation is carried out to formula (7) to obtain,
And F (r) < ρ (V2r+ω2r3)l(r)(cosβ-sinθ)-ρωr2l(r)sinβ[ωr-ωrcosβ]；
To make the wind electricity blade chord length of design that there is larger power output, take
F (r)=ρ (V2r+ω2r3)l(r)(cosβ-sinθ)-ρωr2l(r)sinβ[ωr-ωrcosβ](9)
According to formula (9), if the windward side chord length of blade are as follows:
If the leeward chord length of blade are as follows:
Comparison expression (10), formula (11),
Cos β-sin θ=sin β [1-cos β] (12)
Formula (10), formula (11) are substituted into formula (6) and obtained,
,
That is,
In formula (13), if regarding upper limit of integral R as variable, it is that its first derivative is equal to zero that M, which takes the condition of extreme value, then
L (R)=0, so,
That is,
So
Up to the formula of the corresponding leaf chord length l (r) in setting place on wind electricity blade out are as follows:
In the optional scheme of the embodiment, method that wind electricity blade chord length is determined according to propeller pitch angle further include: calculate wind-powered electricity generation
The sine value sin β of propeller pitch angle of the infinitesimal section of blade on the wheel hub of wind wheel.
According to formula (12), formula (12) is rewritten as
(1+sin β) cos β=sin β+sin θ (18)
Formula (18) both sides are squared respectively,
(1+sinβ)2cos2β=(sin β+sin θ)2(19)
Expansion (19), obtains,
sin4β+2sin3β+sin2β+2(sinθ-1)sinβ-cos2θ=0 (20),
The equation that the sine value sin β of propeller pitch angle of formula (20) the i.e. infinitesimal section of wind electricity blade on the wheel hub of wind wheel meets.
The determination method of the chord length of wind electricity blade provided by the invention is specific in blade design
Using are as follows: known wind power generating set parameter is as shown in table 1:
| Rated power/kw | 1500 |
| Rated speed/rpm | 21.3 |
| Rated wind speed/m/s | 12 |
| Atmospheric density/kg/m3 | 1.225 |
| Wind wheel root radius/m | 1 |
| Wind wheel radius/m | 35 |
1. determining the wind wheel blade number of Wind turbines and the power output of single wind electricity blade, the wind of three wind electricity blades is selected
It takes turns, then the power output N of single wind electricity blade are as follows:
2. determining the opplied moment M that wind electricity blade generates
Because of rated speed neFor 9rpm, then the rotation rated angular velocity ω of wind electricity blade are as follows:
Again because of N=M ω,
3. determining the chord length l (r) at wind wheel blade different radiuses of rotation
According to known parameters: atmospheric density ρ=1.225kg/m3, rated wind speed V=12m/s, wind wheel root radius R0=1m
With wind wheel radius of turn R=35m；And above-mentioned calculating parameter: the torque M and leaf of wind wheel rated angular velocity ω and single blade generation
Piece different radiuses of rotation r, which substitutes into formula (15), can be obtained the chord length l (r) at blade different radiuses of rotation, be shown in Table 2.For just
In comparison, table 2 gives the chord of blade long value that current traditional design method obtains.For the sake of intuitive, Fig. 5 gives chord length
Traditional design value and formula (15) calculated value with wind wheel blade radius of turn change curve, where it can be seen that chord length formula calculates
Value along blade radial from leaf with being reduced rapidly to from blade tip, variation tendency is obvious, thus effectively reduce Wind turbines manufacture, transport
And installation cost, preresearch estimates, the Wind turbines designed by the Wind turbines cost that designs of the present invention compared with traditional design method at
This reduction about 22% to 26%.
Table 2 present invention determine that wind electricity blade chord length and traditional design chord length
Continued 2
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of wind electricity blade, for being mounted on the wheel hub of wind wheel, which is characterized in that set place pair on the wind electricity blade
The formula of the leaf chord length l (r) answered are as follows:
Wherein, the rotation axis of the wind electricity blade is the axis of the wheel hub of the wind wheel, and M indicates that air flows through the wind-powered electricity generation leaf
The opplied moment of the generated rotation axis to wind electricity blade when piece, ρ indicate the density of air, and R indicates wind electricity blade
Blade tip and the wind wheel the distance between the axis of wheel hub, V indicates air when flowing at the setting of the wind electricity blade
Initial absolute movement speed, r indicate on the wind electricity blade at setting with the distance between the axis of wheel hub of the wind wheel, β
Indicate propeller pitch angle of the infinitesimal section of wind electricity blade on the wheel hub of the wind wheel, R0Indicate the radius of the wheel hub of the wind wheel.
2. wind electricity blade according to claim 1, which is characterized in that the infinitesimal section of the wind electricity blade is in the wind wheel
The sine value sin β of propeller pitch angle on wheel hub meets equation:
sin4β+2sin3β+sin2β+2(sinθ-1)sinβ-cos2θ=0, wherein θ indicates that air flows into the wind electricity blade
Angle between the axis of the wheel hub of initial relative movement speed and the wind wheel when at setting.
3. wind electricity blade according to claim 1, which is characterized in that including windward side and corresponding with the windward side
Leeward.
4. a kind of wind wheel, which is characterized in that including wind electricity blade as claimed in any one of claims 1-3.
5. wind wheel according to claim 4, which is characterized in that further include wheel hub, the wind electricity blade is installed on the wheel
On hub.
6. wind wheel according to claim 5, which is characterized in that the quantity of the wind electricity blade is multiple, and multiple described
Wind electricity blade is uniformly distributed along the circumferential direction of the wheel hub.
7. a kind of method for determining wind electricity blade chord length according to propeller pitch angle, which is characterized in that the determination method includes:
According to relative motion principle, initial relative movement speed when air flows through at the setting of the wind electricity blade is obtainedWherein, V indicates initial absolute movement speed when air flows at the setting of the wind electricity blade, ω
Indicate the angular velocity of rotation of wind wheel, r indicate on the wind electricity blade at setting between the axis of the wheel hub of the wind wheel away from
From；
The opplied moment M's of the rotation axis to the wind electricity blade generated when flowing through the entire wind electricity blade according to air
Calculation formula:
The formula that the corresponding leaf chord length l (r) in place is set on the wind electricity blade is calculated are as follows:
Wherein, the rotation axis of the wind electricity blade is the axis of the wheel hub of the wind wheel, and ρ indicates the density of air, and R indicates wind
The distance between the axis of wheel hub of the blade tip of electric blade and the wind wheel, β indicate the infinitesimal section of wind electricity blade in the wind wheel
Wheel hub on propeller pitch angle, R0Indicate the radius of the wheel hub of the wind wheel；θ indicates that air flows at the setting of the wind electricity blade
When initial relative movement speed and the wind wheel wheel hub axis between angle, α indicate wind electricity blade setting at
The angle of attack.
8. the method according to claim 7 for determining wind electricity blade chord length according to propeller pitch angle, which is characterized in that according to air
The calculation formula of the rotation axis opplied moment dM to the wind electricity blade generated when flowing through the infinitesimal section of the wind electricity blade:
The effect that air flows through the generated rotation axis to wind electricity blade when the entire wind electricity blade is calculated
The calculation formula of torque M, wherein dQ indicates to flow through the air mass flow of the windward side at the infinitesimal section of the wind electricity blade；Dq table
Show the air mass flow of the leeward at the infinitesimal section for flowing through the wind electricity blade, and dq=l (r) r ω dr sin β；Described in α expression
The angle of attack at the setting of wind electricity blade；Dr indicate the infinitesimal section of the wind electricity blade the wind electricity blade in the radial direction
Length.
9. the method according to claim 7 for determining wind electricity blade chord length according to propeller pitch angle, which is characterized in that the determination side
Method further include: calculate the sine value sin β of propeller pitch angle of the infinitesimal section of the wind electricity blade on the wheel hub of the wind wheel, wherein
The sine value sin β of propeller pitch angle of the infinitesimal section of the wind electricity blade on the wheel hub of the wind wheel meets equation:
sin4β+2sin3β+sin2β+2(sinθ-1)sinβ-cos2θ=0.
10. the method according to claim 7 for determining wind electricity blade chord length according to propeller pitch angle, which is characterized in that pass through survey
Bearing obtains initial absolute movement speed when air flows on the wind electricity blade at setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841394.1A CN109026520B (en) | 2018-07-26 | 2018-07-26 | Wind power blade, wind wheel and method for determining chord length of wind power blade according to pitch angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841394.1A CN109026520B (en) | 2018-07-26 | 2018-07-26 | Wind power blade, wind wheel and method for determining chord length of wind power blade according to pitch angle |
Publications (2)
| Publication Number | Publication Date |
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| CN109026520A true CN109026520A (en) | 2018-12-18 |
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| CN1401913A (en) * | 2001-08-24 | 2003-03-12 | Lg电子株式会社 | Blade part in turbofan |
| WO2007114698A2 (en) * | 2006-04-02 | 2007-10-11 | Gustave Paul Corten | Wind turbine with slender blade |
| CN103047079A (en) * | 2012-12-22 | 2013-04-17 | 中国科学院工程热物理研究所 | Efficient low-load wing section special for horizontal shaft wind turbine blade and designing method of wind section |
| KR20130097515A (en) * | 2012-02-24 | 2013-09-03 | 전북대학교산학협력단 | Airfoil structure of wind power generator |
| CN105893711A (en) * | 2016-05-07 | 2016-08-24 | 安徽科技学院 | Wind power generator blade and structural design method thereof |
| CN108241767A (en) * | 2016-12-27 | 2018-07-03 | 大连理工大学 | A kind of offshore wind turbine blade aerodynamic loading analysis method based on foline theory |
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| CN1401913A (en) * | 2001-08-24 | 2003-03-12 | Lg电子株式会社 | Blade part in turbofan |
| WO2007114698A2 (en) * | 2006-04-02 | 2007-10-11 | Gustave Paul Corten | Wind turbine with slender blade |
| KR20130097515A (en) * | 2012-02-24 | 2013-09-03 | 전북대학교산학협력단 | Airfoil structure of wind power generator |
| CN103047079A (en) * | 2012-12-22 | 2013-04-17 | 中国科学院工程热物理研究所 | Efficient low-load wing section special for horizontal shaft wind turbine blade and designing method of wind section |
| CN105893711A (en) * | 2016-05-07 | 2016-08-24 | 安徽科技学院 | Wind power generator blade and structural design method thereof |
| CN108241767A (en) * | 2016-12-27 | 2018-07-03 | 大连理工大学 | A kind of offshore wind turbine blade aerodynamic loading analysis method based on foline theory |
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