CN118278118B - Blade design method, blade and wind generating set - Google Patents
Blade design method, blade and wind generating set Download PDFInfo
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- CN118278118B CN118278118B CN202211741457.9A CN202211741457A CN118278118B CN 118278118 B CN118278118 B CN 118278118B CN 202211741457 A CN202211741457 A CN 202211741457A CN 118278118 B CN118278118 B CN 118278118B
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000009434 installation Methods 0.000 claims abstract description 71
- 238000005452 bending Methods 0.000 claims abstract description 62
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000012795 verification Methods 0.000 claims 1
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- 238000010248 power generation Methods 0.000 description 4
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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
- F03D1/06—Rotors
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention provides a blade design method, a blade and a wind generating set, wherein the design method comprises the steps of determining an installation rotation angle R and a sweepback value Y of the blade according to design parameters of the wind generating set, wherein the blade is provided with a first zero-degree attitude line, the installation rotation angle R is an included angle between the first zero-degree attitude line and a zero-degree datum line on the wind generating set, determining a pre-bending value X of the blade in a mold attitude according to the sweepback value Y, the installation rotation angle R and the corresponding relation of the pre-bending value X of the blade in the mold attitude, and determining a main beam positioning and a web positioning of the blade in the mold attitude according to the pre-bending value X to obtain a design model of the blade. According to the blade design method provided by the invention, the blade can be better in process realization performance under the condition that the sweepback blade can be obtained, and the rigidity characteristic of the girder material is maintained to the greatest extent.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a blade design method, a blade and a wind generating set.
Background
The global energy crisis and environmental pollution, the development and utilization of new energy and renewable energy are assisted, and wind energy is taken as clean renewable energy and becomes an important direction of new energy development.
The blades are main components for capturing wind energy of the wind driven generator, and along with the gradual increase of megawatt level of the wind driven generator, the blades of the wind driven generator are longer and longer, and the loads of the blades are larger and larger. In the face of increasing load, the unit components can only improve the safety of the whole machine by improving the material consumption, which necessarily leads to the increase of the weight and the cost of the unit, and the safety of the whole machine is also influenced.
As a main component for capturing wind energy, the design load reduction of the blade is more and more concerned, the concept of the swept back design of the blade is gradually put forward, and in the pneumatic design of the blade, the wing profile of the blade is connected on the variable pitch shaft of the blade in series, and the appearance of the blade is determined by adjusting the relative positions of the neutral shaft and the variable pitch shaft of the blade.
As shown in figures 1 and 2, the blade pitch axis A of the unbroken blade is relatively close to the blade neutral axis B, the blade is in a 'string' on the pitch axis at the aerodynamic center or maximum thickness position, and the neutral axis C of the unbroken blade is more deviated to the rear edge along with the distance from the blade root, so that the blade profile is swept to the rear edge, the unbroken blade obtains pitching moment in the feathering direction, the effect of increasing the torsion angle of the section of the blade is realized, and the load reduction of the blade is realized.
However, since the neutral axis C of the swept blade is not a straight line, in the blade production process, when the girder is laid along the blade root to the blade tip direction, the girder cannot be laid along the straight line direction, and the girder needs to be laid along the direction of the neutral axis C according to the requirement of the sweep. In order to realize accurate positioning of the main beam and the web plate of the sweepback blade, the process implementation of the blade is required to be higher, and the manufacturing difficulty of the blade is increased.
Disclosure of Invention
One of the main objects of the present invention is to provide a blade design method that can keep the girder and web laid along a straight line to improve the process realisation of the blade and reduce the blade load of the wind turbine.
Aiming at the purpose of the invention, the invention provides the following technical scheme:
according to one aspect of the invention, a blade design method is provided, and the blade design method comprises the steps of determining an installation rotation angle R and a sweepback value Y of a blade according to design parameters of a wind generating set, wherein the blade is provided with a first zero-degree attitude line, the installation rotation angle R is an included angle between the first zero-degree attitude line and a zero-degree datum line on the wind generating set, determining a pre-bending value X of the blade in a mold attitude according to the sweepback value Y, the installation rotation angle R and the pre-bending value X of the blade in the mold attitude, and determining a main beam positioning and a web positioning of the blade in the mold attitude according to the pre-bending value X to obtain a design model of the blade.
The method comprises the steps of setting an initial pre-bending value X0 of the blade in a die attitude and setting an initial installation rotation angle R0, determining an initial sweepback value Y0 according to the initial pre-bending value X0 and the initial installation rotation angle R0 of the blade, judging whether the initial sweepback value Y0, the initial pre-bending value X0 and the initial installation rotation angle R0 meet the design parameters of the wind turbine generator set, and determining the sweepback value and the installation rotation angle meeting the design parameters of the wind turbine generator set as the sweepback value Y and the installation rotation angle R, wherein the numerical ranges of the installation rotation angle R and the initial installation rotation angle R0 are between 2 degrees and 10 degrees, and the initial sweepback value Y0 is determined according to the pneumatic performance design parameters of the blade, the power design parameters of the wind turbine generator set and the initial installation rotation angle R0.
The step of judging whether the initial sweepback value Y0, the initial pre-bending value X0 and the initial installation rotation angle R0 meet the design parameters of the wind generating set comprises the steps of judging whether the initial sweepback value Y0 is within a convergence threshold value, if the initial sweepback value Y0 is within the convergence threshold value, determining the initial sweepback value Y0 as the sweepback value Y, and determining the initial installation rotation angle R0 as the installation rotation angle R.
If the initial sweep value Y0 is not within the convergence threshold, the mounting rotation angle is adjusted and/or the initial pre-bend value X0 is adjusted within the range of values for the mounting rotation angle until a sweep value Y within the convergence threshold is obtained.
The step of determining the sweepback value Y further comprises the steps of obtaining sweepback values at a plurality of positions by carrying out pneumatic simulation on the initial pre-bending value X0 and the blades with the initial installation rotation angle R0, and obtaining the initial sweepback value Y0 of the blades at each position in the spanwise direction through a spline curve fitting method.
The corresponding relation among the sweepback value Y, the installation rotation angle R and the pre-bending value X of the blade in the mold posture is X=Y/sin (R).
The sweepback value Y and the pre-bending value X respectively comprise corresponding sweepback values Y and pre-bending values X at a plurality of positions corresponding to a plurality of airfoil sections in the spanwise direction of the blade.
The blade design method further comprises the steps of calculating and checking the design model of the blade according to the design parameters of the wind generating set after the design model of the blade is obtained.
The blade design method further comprises the steps of optimizing the installation rotation angle R and the sweepback value Y according to calculation and checking results, determining the optimized installation rotation angle and the optimized sweepback value as the installation rotation angle R and the sweepback value Y, and determining the pre-bending value of the blade in the mold attitude again until a design model of the blade meeting the design parameter range of the wind generating set is obtained.
The method comprises the steps of determining the main beam positioning and the web positioning of the blade in the mold attitude according to the pre-bending value X, determining the chord length station positions of the blade in the mold attitude in two airfoil sections after the pre-bending value X is obtained, enabling the main beam to be laid in a straight line along the spanwise direction of the blade in the mold attitude, and determining the web positioning according to the distance between the web and the central line of the main beam according to the positioning of the main beam, and enabling the web to be arranged in the vertical direction in the mold attitude.
According to another aspect of the present invention, there is provided a blade which is a final design blade obtained by the blade design method as described above, wherein the blade has the second zero degree attitude line, and an angle between the second zero degree attitude line and the first zero degree attitude line is the mounting rotation angle R.
According to a further aspect of the invention there is provided a wind power plant comprising a hub and a blade as mentioned in the above claims, wherein the blade is mounted by aligning a second zero degree attitude line with a zero degree datum line on the hub.
The blade obtained by the design method can be manufactured according to the process without sweepback blade, so that the blade girder can be linearly placed in the blade mould without bending along a sweepback curve, and after being assembled on the hub of the wind turbine generator set based on a rotation installation angle, the blade can obtain a desired sweepback value and a pre-bending value, and the load reduction function of the wind turbine generator set is realized. Therefore, the blade has better process realizability, can avoid the problem of blade rigidity reduction caused by girder fibers, maintains the rigidity characteristics of girder materials to the greatest extent, simplifies the manufacturing process and improves the process realizability.
In addition, according to the blade design method, modeling calculation optimizing can be easier, and sweepback design can be realized without complex structural adjustment for each adjustment, so that the blade calculation iteration efficiency is greatly improved.
Drawings
The foregoing and/or other objects and advantages of the invention will become more apparent from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 shows a plan view (top view) of a swept blade.
Fig. 2 shows a plan view (top view) of a swept blade.
Fig. 3 shows a front view of the blade and shows a pre-bending of the blade.
Fig. 4 shows a flow chart of a blade design method according to the invention.
Fig. 5 shows a schematic view from the root side when the blade rotates by an angle R.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the embodiments of the present invention should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
In order to avoid interference and collision between the blades and the tower barrel after elastic deformation, the blades are usually subjected to pre-bending design. Fig. 3 shows a front view of the blade and shows a pre-bent state of the blade, the pre-bending of the blade referring to the deviation of the chord line of the blade from the pitch axis in the direction shown in fig. 3, in fig. 3 PS referring to the pressure side of the blade, SS referring to the suction side of the blade, and the X value corresponds to the pre-bending value at the tip position. For each airfoil section of the blade, the closer to the tip, the greater the pre-bend value at the corresponding airfoil section.
Referring back to fig. 2, fig. 2 shows a top view of the blade and marks the swept back state of the blade, i.e. fig. 2 is a top view of the blade of fig. 3, the blade sweep referring to the deviation of the neutral axis of the blade from the pitch axis a in the direction shown in fig. 2, as shown in fig. 2, the Y1 value corresponds to the swept back value at the tip position. Similar to the pre-bending of the blade, for each airfoil section of the blade, the closer to the tip, the greater the sweep value at the corresponding airfoil section.
Based on this, the present invention provides a blade designing method, and specific steps of the blade designing method according to an embodiment of the present invention are described below, as shown in fig. 4, the blade designing method including:
S100, determining an installation rotation angle R (see FIG. 5) and a sweepback value Y of a blade according to design parameters of a wind generating set, wherein the blade is provided with a first zero-degree attitude line 10, and the installation rotation angle R is an included angle between the first zero-degree attitude line 10 and a zero-degree datum line on the wind generating set;
S200, determining a pre-bending value X of the blade in the mold attitude according to the corresponding relation among the sweepback value Y, the installation rotation angle R and the pre-bending value X of the blade in the mold attitude;
S300, determining the girder positioning and the web positioning of the blade in the mold posture according to the pre-bending value X, and obtaining a design model of the blade.
It should be noted that in the following description, references to sweep and pre-bend values do not refer to a corresponding value at one location on the blade, but include corresponding sweep and pre-bend values at a corresponding plurality of locations at a plurality of airfoil sections in the spanwise direction of the blade.
Here, the mold attitude refers to an attitude of the blade when manufactured in the mold, and for the blade without sweep, the blade has the same pre-bending value and sweep value in the mold attitude and the mounting attitude. Design parameters of a wind park include, for example, blade load shedding rate, power generation, blade aerodynamic performance, blade clearance, etc., as mentioned below.
According to the design method provided by the embodiment of the invention, when the obtained design model of the blade is manufactured in the mold, the design model of the blade does not have the above-described sweepback value Y in the mold posture. For example, the sweep value Y of the design model of the blade in the mold attitude is 0. That is, the design model of the blade has a sweepback value Y in the installation state, but does not have the sweepback value in the manufacturing process (under the mold posture), so that the main beam and the web of the blade can be kept to be laid along a straight line in the spanwise direction of the blade, the straight line of the main beam and the web is laid and positioned, the process realizability of the blade is greatly improved, and the positioning precision of the main beam and the web is improved.
In addition, when the blade structure is designed through the design model of the blade, the main beam and the web plate can be positioned through straight lines between two points, so that the finite element modeling of the blade can be realized more conveniently, the calculation precision is improved, the rigidity of the material is maintained to the maximum, and the weight and cost reduction of the blade are facilitated.
Furthermore, by adopting the blade design method, the blade with the sweepback effect can be manufactured according to the blade without sweepback and with the pre-bending value of X, and the production process is simplified. When the blade is mounted on the hub, the second zero-degree attitude line 20 with an included angle of the first zero-degree attitude line 10 as the mounting rotation angle R can be mounted, so that the blade has a certain pre-bending value while having a sweepback effect. It should be noted that, the first zero-degree attitude line refers to a blade shell mold-closing line (i.e. a mold-closing line of a blade in a mold attitude) in the present application, and the second zero-degree attitude line is used for aligning with a zero-degree datum line of a hub during installation.
Thus, the design model of the blade obtained may have different sweep and pre-bend values in the mold attitude and in the mounting attitude.
In addition, the correspondence between the sweep value Y, the installation rotation angle R, and the pre-bending value X of the blade in the mold attitude mentioned in the above design step may be x=y/sin (R), and therefore, after the installation rotation angle R and the sweep value Y of the blade are determined, the pre-bending value of the blade in the mold attitude may be calculated by the expression, so that the pre-bending is performed with the pre-bending value in the blade manufacturing process.
In an alternative embodiment of the present invention, the step of determining the mounting rotation angle R and the sweep value Y of the blade according to the design parameters of the wind turbine generator system as described above comprises:
setting an initial pre-bending value X0 of the blade in the mold attitude and setting an initial installation rotation angle R0, and determining an initial sweepback value Y0 according to the initial pre-bending value X0 and the initial installation rotation angle R0 of the blade;
Judging whether the initial sweepback value Y0, the initial pre-bending value X0 and the initial installation rotation angle R0 meet the design parameters of the wind generating set;
And determining a sweepback value and an installation rotation angle which meet the design parameters of the wind generating set as the sweepback value Y and the installation rotation angle R.
Since the initial sweep Y0, the initial pre-bend X0 and the initial installation rotation angle R0 will affect the design parameters of the wind turbine generator set together, in the above steps, it is necessary to determine whether the blade meets the design parameter requirements of the wind turbine generator set by all three parameters.
In addition, the numerical range of the installation rotation angle R and the initial installation rotation angle R0 may be between 2 ° and 10 °, and this numerical range of the installation rotation angle R and the initial installation rotation angle R0 is empirically selected. Specifically, if the mounting rotation angle R is too large, the sweep will be large, and although the sweep of the blade can realize load reduction of the wind generating set, excessive reduction of the generated energy may be caused, so that if the sweep value is too large, the requirement of the generated energy may not be met, and meanwhile, if the mounting rotation angle R of the blade is too large, the aerodynamic performance of the blade may be adversely affected. Therefore, the installation rotation angle R and the initial installation rotation angle R0 can be selected in the range of 2 ° to 10 °, and the above-described adverse effects can be effectively avoided. In addition, since the range of the value of the initial installation rotation angle R0 is small, the number of iterations can be reduced.
In addition, although it is described above that the corresponding relationship between the sweep value Y, the mounting rotation angle R, and the pre-bending value X of the blade in the mold attitude is x=y/sin (R) (i.e., the same corresponding relationship between the initial sweep value Y0, the initial pre-bending value X0, and the initial mounting rotation angle R0 is x0=y0/sin (R0)), the sweep value Y seems to be directly determined according to the corresponding relationship, in fact, the sweep value obtained by the corresponding relationship may be significantly different from the desired sweep value, so it is necessary to further correct it according to the aerodynamic performance design parameter of the blade, the power design parameter of the wind turbine generator set, so as to obtain a sweep value that meets the desired requirement, and therefore, the sweep value is commonly determined according to the aerodynamic performance design parameter of the blade, the power design parameter of the wind turbine generator set, the mounting rotation angle R, and the like.
In an alternative embodiment of the invention, the specific step of obtaining an initial sweep value Y0 may comprise:
The blade with the initial pre-bending value X0 and the initial installation rotation angle R0 is subjected to pneumatic simulation to obtain sweepback values at a plurality of positions, and the initial sweepback values Y0 of the blade at all positions in the spanwise direction are obtained through a spline curve fitting method, so that the corrected initial sweepback values Y0 are obtained.
However, although the initial sweep Y0 is corrected, the initial sweep Y0 may not meet design requirements, and thus the initial pre-bend value X0 and/or the initial installation rotation angle R0 may need to be adjusted and checked again.
It should be noted that, in the above embodiment, the sweep back value of the blade at each position in the spanwise direction is obtained by using a spline curve fitting method, but other fitting methods may be realized by those skilled in the art, for example, a piecewise interpolation method.
In yet another embodiment of the present invention, the step of determining whether the initial sweep value Y0, the initial pre-bend value X0, and the initial installation rotation angle R0 satisfy design parameters of the wind turbine generator set includes:
judging whether the initial sweepback value Y0 is within a convergence threshold value or not;
If the initial sweep value Y0 is within the convergence threshold, the initial sweep value Y0 is determined as the sweep value Y and the initial mounting rotation angle R0 is determined as the mounting rotation angle R.
According to the embodiment of the invention, the convergence threshold value can be determined by the load reduction rate of the wind generating set, the aerodynamic performance requirement of the blades, the generating capacity and the like, namely, whether the initial sweepback value Y0 is within the convergence threshold value is judged, namely, after the initial sweepback value Y0 is obtained, whether a design model of the blades obtained through the sweepback value can obtain a value within the convergence threshold value when the blades are installed on the wind generating set is required to be judged, if the value within the convergence threshold value is obtained, a design model of expected blades can be obtained according to the initial sweepback value Y0 and the initial installation rotation angle R0, namely, the initial sweepback value Y0 can be determined to be a final sweepback value Y, and the initial installation rotation angle R0 can be determined to be a final installation rotation angle R.
If the initial sweep value Y0 is not within the convergence threshold, the installation rotation angle is adjusted within the numerical range of the installation rotation angle and/or the initial pre-bend value X0 is adjusted until a sweep value Y within the convergence threshold is obtained.
That is, the pre-bending value X of the blade in the mold attitude can be determined by adjusting the installation rotation angle R and/or adjusting the initial pre-bending value X0, and iterating until a sweepback value Y meeting the requirements of the load reduction rate, the power generation amount and the blade aerodynamic performance of the wind generating set is obtained, and the pre-bending value X of the blade in the mold attitude is reversely determined according to the sweepback value Y, so that the designed blade model is obtained.
In practice, the above-described process of obtaining a sweepback value Y within the convergence threshold is actually a process of calculating and checking a design model of the blade having different sweepback values and mounting rotation angles. In the process, the installation rotation angle R and the sweepback value Y are continuously optimized according to the calculation and the check results, the optimized installation rotation angle and the optimized sweepback value are determined to be new installation rotation angle and new sweepback value, and the pre-bending value of the corresponding blade in the mould posture is determined again until a design model of the blade meeting the design parameter range of the wind generating set is obtained.
In an alternative embodiment of the present invention, the step of determining the main beam positioning and the web positioning of the blade in the mold attitude according to the pre-bending value X includes determining the chord length positions of the blade in the mold attitude in the two airfoil sections after obtaining the pre-bending value X, so that the main beam is laid in a straight line along the spanwise direction of the blade in the mold attitude;
According to the positioning of the main beam and the distance between the web and the central line of the main beam, the web positioning is determined, so that the web is arranged in the vertical direction under the mold posture.
Because the position of laying of girder will influence the load reduction rate and the generated energy of blade, when the girder is close to the leading edge and lays, load reduction effect can be better, and when the girder is close to the trailing edge and lays, the generated energy will improve, consequently, according to the design demand, can confirm that the blade girder is whole to be closer to the blade leading edge or the blade trailing edge. Therefore, in another embodiment of the blade design method according to the present invention, on the basis of the steps of the design method, the method further includes verifying the position of the main beam, and then generating a design model of the blade.
That is, the influence of the blade structure (main girder laying position and web position) is taken into account in the step of judging whether the sweep value satisfies the convergence threshold value and in the step of calculating and checking the design model of the blade according to the design parameters of the wind turbine generator set.
The blade obtained by the blade design method can obtain the expected sweepback value and the pre-bending value, realize the load reduction function of the wind generating set, and simultaneously can be manufactured according to the process without sweepback blades, thereby simplifying the manufacturing process and improving the process realizability.
Another aspect of the present invention also provides a blade obtained by the above blade design method, the blade having a second zero-degree attitude line 20 with an angle with the first zero-degree attitude line 10 being the above-described mounting rotation angle R.
Another aspect of the present invention may also provide a wind power generation set including a hub and a blade obtained by the above-described blade design method, the blade being mounted by aligning a second zero degree attitude line with a zero degree datum line on the hub so that the blade has a desired pre-bend value and sweep value in a mounted attitude. The pre-bending value X 'of the blade in the installation posture can be expressed by the following formula of X' =X×cos (R) =Y/sin (R) ×cos (R).
According to the blade design method, the sweepback design of the blade is obtained in a corner mode, and the blade main beam can be linearly placed in the blade mould without bending along a sweepback curve by coupling the pre-bending and the sweepback of the blade. Therefore, the blade has better process realizability, can avoid the problem of blade rigidity reduction caused by girder fibers, and keeps the rigidity characteristics of girder materials to the greatest extent.
In addition, according to the blade design method, modeling calculation optimizing can be easier, and sweepback design can be realized without complex structural adjustment for each adjustment, so that the blade calculation iteration efficiency is greatly improved.
The embodiments of the present application have been described above, but various modifications and variations can be made to the embodiments of the present application by those skilled in the art without departing from the spirit and scope of the present application. It will be appreciated that those skilled in the art will appreciate that such modifications and variations will still fall within the spirit and scope of the embodiments of the application as defined by the appended claims.
Claims (12)
1. A method of designing a blade, the method comprising:
determining the installation rotation angle R and the sweepback value Y of the blade according to the design parameters of the wind generating set,
The blade is provided with a first zero-degree attitude line (10), and the installation rotation angle R is an included angle between the first zero-degree attitude line (10) and a zero-degree datum line on the wind generating set;
Determining a pre-bending value X of the blade in the mold attitude according to the corresponding relation among the sweepback value Y, the installation rotation angle R and the pre-bending value X of the blade in the mold attitude;
Determining the main beam positioning and web positioning of the blade in the mold attitude according to the pre-bending value X to obtain a design model of the blade,
The step of determining the installation rotation angle R and the sweepback value Y of the blade according to the design parameters of the wind generating set comprises the following steps:
setting an initial pre-bending value X0 of the blade in the mold attitude and setting an initial installation rotation angle R0;
Determining an initial sweepback value Y0 according to the initial pre-bending value X0 and the initial installation rotation angle R0 of the blade;
Judging whether the initial sweepback value Y0, the initial pre-bending value X0 and the initial installation rotation angle R0 meet the design parameters of the wind generating set or not;
And determining a sweepback value and an installation rotation angle which meet the design parameters of the wind generating set as the sweepback value Y and the installation rotation angle R.
2. The blade design method according to claim 1, wherein,
The value of the installation rotation angle R and the initial installation rotation angle R0 ranges from 2 DEG to 10 DEG, and
The initial sweep value Y0 is determined according to the aerodynamic performance design parameter of the blade, the power design parameter of the wind generating set and the initial installation rotation angle R0.
3. The blade design method according to claim 2, wherein,
The step of judging whether the initial sweepback value Y0, the initial pre-bending value X0 and the initial installation rotation angle R0 meet the design parameters of the wind generating set comprises the following steps:
judging whether the initial sweepback value Y0 is within a convergence threshold value or not;
If the initial sweep value Y0 is within the convergence threshold, the initial sweep value Y0 is determined as the sweep value Y and the initial mounting rotation angle R0 is determined as the mounting rotation angle R.
4. A blade design method according to claim 3, wherein,
If the initial sweep value Y0 is not within the convergence threshold, the mounting rotation angle is adjusted and/or the initial pre-bend value X0 is adjusted within the range of values for the mounting rotation angle until a sweep value Y within the convergence threshold is obtained.
5. The blade design method as set forth in claim 2, wherein the step of determining the sweep value Y further comprises pneumatically simulating the blade of the initial pre-bending value X0 and the initial installation rotation angle R0 to obtain sweep values at a plurality of positions;
Obtaining the initial sweepback value Y0 of the blade at each position in the spanwise direction through a spline curve fitting method.
6. The blade design method according to claim 1, wherein the correspondence of the sweep value Y, the mounting rotation angle R, and the pre-bending value X of the blade in the mold posture is x=y/sin (R).
7. The blade design method as claimed in claim 1, wherein the sweep value Y and the pre-bend value X respectively include the sweep value Y and the pre-bend value X at a plurality of positions corresponding to a plurality of airfoil sections in the spanwise direction of the blade.
8. The blade design method according to claim 1, further comprising calculating and checking the design model of the blade according to design parameters of the wind turbine generator system after obtaining the design model of the blade.
9. The blade design method according to claim 8, further comprising optimizing the mounting rotation angle R and the sweep value Y according to the result of calculation and verification, and determining the optimized mounting rotation angle and the optimized sweep value as the mounting rotation angle R and the sweep value Y;
And determining the pre-bending value of the blade in the mold attitude again until a design model of the blade meeting the design parameter range of the wind generating set is obtained.
10. The blade design method according to any one of claims 1 to 9, wherein the step of determining the spar positioning and web positioning of the blade in the mold attitude from the pre-bending value X includes:
after the pre-bending value X is obtained, determining chord length stations of the blade in two airfoil sections in a mold attitude, and enabling the main beam to be laid in a straight line along the spanwise direction of the blade in the mold attitude;
And determining the positioning of the web plate according to the positioning of the main beam and the distance between the web plate and the central line of the main beam, so that the web plate is arranged in the vertical direction under the posture of the die.
11. A blade, characterized in that the blade is a final design blade obtained by the blade design method according to any one of claims 1-10,
The blade is provided with a second zero-degree attitude line (20), and an included angle between the second zero-degree attitude line (20) and the first zero-degree attitude line (10) is the installation rotation angle R.
12. A wind power plant, characterized in that it comprises a hub and blades according to claim 11,
Wherein the blade is mounted by aligning a second zero degree attitude line (20) with a zero degree datum line on the hub.
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| CN102102623A (en) * | 2009-12-22 | 2011-06-22 | 西格弗里德·米克勒 | Aeroacoustic rotor blade of a wind power plant and wind power plant equipped therewith |
| CN109902384A (en) * | 2019-02-28 | 2019-06-18 | 上海交通大学 | A pre-bending and pre-torsional design method for wind turbine flexible blades based on aeroelastic model |
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| KR20130094109A (en) * | 2012-02-15 | 2013-08-23 | 목포대학교산학협력단 | Propeller blade geometry design for wind turbine by using nurbs |
| US9416771B2 (en) * | 2013-06-26 | 2016-08-16 | Siemens Aktiengesellschaft | Method for controlling loads in a wind turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102102623A (en) * | 2009-12-22 | 2011-06-22 | 西格弗里德·米克勒 | Aeroacoustic rotor blade of a wind power plant and wind power plant equipped therewith |
| CN109902384A (en) * | 2019-02-28 | 2019-06-18 | 上海交通大学 | A pre-bending and pre-torsional design method for wind turbine flexible blades based on aeroelastic model |
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