Blade design method, blade and wind turbine generator set

Abstract

The present invention provides a blade design method, a blade and a wind turbine generator set, the design method comprising: determining the installation rotation angle R and the sweep value Y of the blade according to the design parameters of the wind turbine generator set, wherein the blade has a first zero-degree attitude line, and the installation rotation angle R is the angle between the first zero-degree attitude line and the zero-degree reference line on the wind turbine generator set; determining the pre-bending value X of the blade in the mold attitude according to the corresponding relationship between the sweep 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, and obtaining the design model of the blade. According to the blade design method of the present invention, the blade can be made more feasible in terms of process when a swept blade can be obtained, and the main beam material stiffness characteristics can be maintained to the greatest extent.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a blade design method, a blade and a wind power generator set. Background Art

[0002] The global energy crisis and environmental pollution have promoted the development and utilization of new and renewable energy. Wind energy, as a clean and renewable energy, has become an important direction for the development of new energy.

[0003] Blades are the main components of wind turbines to capture wind energy. As the megawatt level of wind turbines gradually increases, wind turbine blades are getting longer and longer, and the blade load is also getting heavier. Faced with the increase in load, the unit components can only improve the safety of the whole machine by increasing the amount of materials used, which will inevitably lead to an increase in the weight and cost of the unit, and the safety of the whole machine is also affected.

[0004] As the main component for capturing wind energy, blade design load reduction has received more and more attention, and the concept of blade sweep design has gradually been proposed; in the aerodynamic design of blades, the blade airfoil is "stringed" on the blade pitch shaft, and the shape of the blade is determined by adjusting the relative position of the blade neutral axis and the pitch shaft.

[0005] like Figure 1 and Figure 2 As shown, the blade pitch axis A of the unswept blade is relatively close to the blade neutral axis B, and the blade is "stringed" on the pitch axis at the aerodynamic center or the position of maximum thickness; while the neutral axis C of the swept blade is biased toward the trailing edge as it moves away from the blade root, so that the blade shape is swept toward the trailing edge, and the swept blade obtains a pitch moment in the propeller direction, achieving the effect of increasing the torsion angle of the blade section, thereby achieving blade load reduction.

[0006] However, since the neutral axis C of the swept blade is not a straight line, in the production process of the blade, when laying the main beam from the root to the tip of the blade, it will not be possible to lay it in a straight line, and the main beam needs to be laid along the direction of the neutral axis C according to the requirements of the swept blade. In order to achieve the precise positioning of the main beam and the web of the swept blade, this puts forward higher requirements on the process realization of the blade, which increases the difficulty of manufacturing the blade. Summary of the invention

[0007] One of the main purposes of the present invention is to provide a blade design method that can keep the main beam and the web plate laid along a straight line to improve the process feasibility of the blade and reduce the load on the wind turbine blade.

[0008] In view of the above-mentioned invention object, the present invention provides the following technical solutions:

[0009] According to one aspect of the present invention, a blade design method is provided, the blade design method comprising: determining an installation rotation angle R and a sweep value Y of the blade according to design parameters of a wind turbine generator set, wherein the blade has a first zero-degree attitude line, and the installation rotation angle R is an angle between the first zero-degree attitude line and a zero-degree reference line on the wind turbine generator set; determining a pre-bending value X of the blade in a mold attitude according to a corresponding relationship among the sweep value Y, the installation rotation angle R, and a pre-bending value X of the blade in a mold attitude; 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.

[0010] The step of determining the installation rotation angle R and the sweep value Y of the blade according to the design parameters of the wind turbine generator set includes: setting the initial pre-bending value X0 of the blade in the mold posture and setting the initial installation rotation angle R0; determining the initial sweep value Y0 according to the initial pre-bending value X0 and the initial installation rotation angle R0 of the blade; judging whether the initial sweep 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; determining the sweep value and the installation rotation angle that meet the design parameters of the wind turbine generator set as the sweep value Y and the installation rotation angle R, wherein the numerical range of the installation rotation angle R and the initial installation rotation angle R0 is between 2° and 10°, and the initial sweep value Y0 is determined according to the aerodynamic performance design parameters of the blade, the power design parameters of the wind turbine generator set and the initial installation rotation angle R0.

[0011] The step of judging whether the initial sweep value Y0, the initial pre-bend value X0 and the initial installation rotation angle R0 meet the design parameters of the wind turbine generator set includes: judging whether the initial sweep value Y0 is within the convergence threshold; if the initial sweep value Y0 is within the convergence threshold, determining the initial sweep value Y0 as the sweep value Y, and determining the initial installation rotation angle R0 as the installation rotation angle R.

[0012] If the initial sweep value Y0 is not within the convergence threshold, the installation rotation angle and / or the initial pre-bend value X0 are adjusted within the numerical range of the installation rotation angle until the sweep value Y within the convergence threshold is obtained.

[0013] The step of determining the sweep value Y also includes: performing aerodynamic simulation on the blade with an initial pre-bend value X0 and an initial installation rotation angle R0 to obtain sweep values ​​at multiple positions; and obtaining the initial sweep value Y0 of the blade at each position in the span direction by a spline curve fitting method.

[0014] The corresponding relationship among the sweep 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).

[0015] The sweep value Y and the pre-bend value X respectively include corresponding sweep values ​​Y and pre-bend values ​​X at a plurality of positions corresponding to a plurality of airfoil sections in the span direction of the blade.

[0016] The blade design method further comprises: after obtaining the design model of the blade, calculating and checking the design model of the blade according to the design parameters of the wind turbine generator set.

[0017] The blade design method also includes optimizing the installation rotation angle R and the sweep value Y according to the results of calculation and verification, and determining the optimized installation rotation angle and the optimized sweep value as the installation rotation angle R and the sweep value Y; and determining the pre-bending value of the blade in the mold posture again until a design model of the blade that meets the design parameter range of the wind turbine generator set is obtained.

[0018] The step of determining the main beam positioning and web positioning of the blade in the mold posture according to the pre-bending value X includes: after obtaining the pre-bending value X, determining the chord length position of the blade in the two airfoil sections in the mold posture, so that the main beam is laid in a straight line along the span direction of the blade in the mold posture; according to the positioning of the main beam, according to the distance between the web and the center line of the main beam, determining the positioning of the web, so that the web is arranged in the vertical direction in the mold posture.

[0019] According to another aspect of the present invention, a blade is provided, which is a final designed blade obtained by the blade design method as described above, wherein the blade has the second zero-degree attitude line, and the angle between the second zero-degree attitude line and the first zero-degree attitude line is the installation rotation angle R.

[0020] According to another aspect of the present invention, a wind turbine generator set is provided, comprising a hub and blades as mentioned in the above technical solution, wherein the blades are installed by aligning a second zero-degree attitude line with a zero-degree reference line on the hub.

[0021] The blades obtained by the above design method can be manufactured according to the process of unswept blades, so that the main beam of the blade can be placed linearly in the blade mold without bending along the swept curve, and after being assembled on the hub of the wind turbine generator set based on the rotation installation angle, the desired swept value and pre-bending value can be obtained to realize the load reduction function of the wind turbine generator set. Therefore, the blade has better process feasibility, can avoid the problem of blade stiffness reduction caused by the main beam fiber, maintain the stiffness characteristics of the main beam material to the greatest extent, and simplify the manufacturing process to improve process feasibility.

[0022] In addition, according to the blade design method of the present invention, it is easier to model and calculate the optimization, and the swept design can be achieved without complex structural adjustments each time, which greatly speeds up the calculation iteration efficiency of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or other objects and advantages of the present invention will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 An unswept blade plan view (top view) is shown.

[0025] Figure 2 A plan view (top view) of a swept blade is shown.

[0026] Figure 3 A front view of the blade is shown and illustrates the pre-bend of the blade.

[0027] Figure 4 A flow chart of a blade design method according to the present invention is shown.

[0028] Figure 5 A schematic diagram is shown from the blade root side when the blade is rotated by an angle R. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be understood that the implementation of the present invention is limited to the embodiments described herein. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0030] In order to avoid interference and collision between the blades and the tower after elastic deformation, the blades are usually pre-bent. Figure 3 The front view of the blade is shown and the pre-bending state of the blade is shown. The pre-bending of the blade refers to the chord line of the blade at Figure 3 Deviating from the pitch axis in the direction shown, Figure 3 In the figure, PS refers to the pressure side of the blade, SS refers to the suction side of the blade, and the X value corresponds to the pre-bend value at the tip of the blade. For each airfoil section of the blade, the closer to the tip of the blade, the greater the pre-bend value at the corresponding airfoil section.

[0031] Return to reference Figure 2 , Figure 2 A top view of the blade is shown and the swept state of the blade is marked, i.e., Figure 2 yes Figure 3 The top view of the blade, the blade sweep refers to the neutral axis of the blade Figure 2 The direction shown deviates from the pitch axis A, such as Figure 2As shown in FIG. 1 , the Y1 value corresponds to the sweep value at the tip of the blade. Similar to the pre-bend of the blade, for each airfoil section of the blade, the closer to the tip of the blade, the greater the sweep value at the corresponding airfoil section.

[0032] Based on this, the present invention provides a blade design method. The specific steps of the blade design method according to an embodiment of the present invention are described below. Figure 4 As shown, the blade design method includes:

[0033] S100, determining the installation rotation angle R of the blades according to the design parameters of the wind turbine generator set (see Figure 5 ) and a sweep value Y, wherein the blade has a first zero-degree attitude line 10, and the installation rotation angle R is the angle between the first zero-degree attitude line 10 and a zero-degree reference line on the wind turbine generator set;

[0034] S200, determining a pre-bending value X of the blade in the mold posture according to a corresponding relationship among a sweep value Y, an installation rotation angle R, and a pre-bending value X of the blade in the mold posture;

[0035] S300, determining the main beam positioning and web positioning of the blade in the mold posture according to the pre-bending value X, and obtaining a design model of the blade.

[0036] It should be noted that in the description below, the sweep value and pre-bend value mentioned do not represent a corresponding value at one position on the blade, but include corresponding sweep values ​​and pre-bend values ​​at multiple corresponding positions on multiple airfoil sections in the span direction of the blade.

[0037] Here, it should be noted that the mold posture refers to the posture of the blade when it is manufactured in the mold. For a non-swept blade, the blade has the same pre-bend value and sweep value in the mold posture and the installation posture. The design parameters of the wind turbine generator set include, for example, the blade load reduction rate, power generation, blade aerodynamic performance, blade clearance, etc. as mentioned below.

[0038] According to the design method provided by the embodiment of the present 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-mentioned sweep value Y in the mold posture. For example, the sweep value Y of the design model of the blade in the mold posture is 0. In other words, the design model of the blade has the sweep value Y in the installed state, but does not have the sweep value during manufacturing (in the mold posture), so the main beam and the web of the blade can be laid in a straight line in the span direction of the blade. The straight-line laying and positioning of the main beam and the web greatly improve the feasibility of the blade process and the positioning accuracy of the main beam and the web.

[0039] In addition, when designing the blade structure through the blade design model, the main beam and the web can also be positioned through a straight line between two points, which can more conveniently realize the finite element modeling of the blade and improve the calculation accuracy; the stiffness of the material is maintained to the maximum, which is conducive to reducing the weight and cost of the blade.

[0040] Furthermore, by adopting the above-mentioned blade design method, a blade with a swept effect can be manufactured as a blade without a swept back and with a pre-bending value of X, thereby simplifying the production process. When the blade is installed on the hub, it can be installed with a second zero-degree attitude line 20 having an angle of installation rotation angle R with the first zero-degree attitude line 10, so that it has a swept back effect and a certain pre-bending value. It should be noted that the first zero-degree attitude line described in this application refers to the blade shell mold line (i.e., the blade's mold line in the mold posture), and the second zero-degree attitude line is used to align with the zero-degree reference line of the hub during installation.

[0041] Therefore, the obtained design model of the blade may have different sweep values ​​and pre-bend values ​​in the mold posture and in the installation posture.

[0042] In addition, the corresponding relationship among the sweep value Y, the installation rotation angle R and the pre-bending value X of the blade in the mold posture mentioned in the above design steps can be X=Y / sin(R). Therefore, after determining the installation rotation angle R and the sweep value Y of the blade, the pre-bending value of the blade in the mold posture can be calculated by this expression, so that the pre-bending value can be used for pre-bending during the blade manufacturing process.

[0043] According to an optional embodiment of the present invention, the step of determining the installation rotation angle R and the sweep value Y of the blade according to the design parameters of the wind turbine generator set as described above includes:

[0044] Setting an initial pre-bending value X0 of the blade in the mold posture and setting an initial installation rotation angle R0; determining an initial sweep value Y0 according to the initial pre-bending value X0 and the initial installation rotation angle R0 of the blade;

[0045] Determine whether the initial sweep value Y0, the initial pre-bend value X0 and the initial installation rotation angle R0 meet the design parameters of the wind turbine generator set;

[0046] The sweep value and the installation rotation angle that meet the design parameters of the wind turbine generator set are determined as the sweep value Y and the installation rotation angle R.

[0047] Since the initial sweep value Y0, the initial pre-bend value X0 and the initial installation rotation angle R0 will jointly affect the design parameters of the wind turbine generator set, in the above steps, all three parameters are needed to determine whether the blade meets the design parameter requirements of the wind turbine generator set.

[0048] In addition, the numerical range of the installation rotation angle R and the initial installation rotation angle R0 can be between 2° and 10°, and this numerical range of the installation rotation angle R and the initial installation rotation angle R0 is selected based on experience. Specifically, if the installation rotation angle R is too large, the sweep will be too large. Although the sweep of the blades can achieve load reduction of the wind turbine generator set, it may also lead to excessive reduction in power generation. Therefore, if the sweep value is too large, it may not meet the power generation requirements; at the same time, if the installation rotation angle R of the blade is too large, it may have an adverse effect on the aerodynamic performance of the blade. Therefore, the installation rotation angle R and the initial installation rotation angle R0 can be selected within the range of 2° to 10°, which can effectively avoid the above-mentioned adverse effects. In addition, since the value range of the initial installation rotation angle R0 is small, the number of iterations can also be reduced.

[0049] In addition, although it is described above that the sweep value Y, the installation rotation angle R and the pre-bend value X of the blade in the mold posture have a corresponding relationship of X=Y / sin(R) (that is, the initial sweep value Y0, the initial pre-bend value X0 and the initial installation rotation angle R0 have the same corresponding relationship X0=Y0 / sin(R0)), the sweep value Y seems to be able to be directly determined based on this corresponding relationship, but in fact, the sweep value obtained by this corresponding relationship may be significantly different from the expected sweep value, so it is necessary to further correct it according to the aerodynamic performance design parameters of the blade and the power design parameters of the wind turbine to obtain a sweep value that meets the expectations. Therefore, the sweep value is determined based on the aerodynamic performance design parameters of the blade, the power design parameters of the wind turbine and the installation rotation angle R.

[0050] In an optional embodiment of the present invention, the specific steps of obtaining the initial sweep value Y0 may include:

[0051] Aerodynamic simulation is performed on a blade with an initial pre-bend value X0 and an initial installation rotation angle R0 to obtain the sweep values ​​at multiple positions, and the initial sweep value Y0 of the blade at each position in the span direction is obtained by the spline curve fitting method, thus obtaining the corrected initial sweep value Y0.

[0052] However, although the initial sweep value Y0 is corrected, the initial sweep value Y0 may not meet the design requirements, so the initial pre-bend value X0 and / or the initial installation rotation angle R0 may need to be adjusted and re-calibrated.

[0053] It should be noted that in the above embodiment, the spline curve fitting method is used to obtain the sweep value of the blade at each position in the span direction, but those skilled in the art may think of other fitting methods to achieve it, for example, a piecewise interpolation method.

[0054] In another embodiment of the present invention, the step of judging whether the initial sweep value Y0, the initial pre-bend value X0 and the initial installation rotation angle R0 meet the design parameters of the wind turbine generator set comprises:

[0055] Determine whether the initial sweep value Y0 is within a convergence threshold;

[0056] 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 installation rotation angle R0 is determined as the installation rotation angle R.

[0057] According to an embodiment of the present invention, the convergence threshold can be jointly determined by the load reduction rate of the wind turbine generator set, the aerodynamic performance requirements of the blades, the power generation, etc., that is, "determining whether the initial sweep value Y0 is within the convergence threshold" means: after obtaining the initial sweep value Y0, it is necessary to determine whether the design model of the blade obtained by the sweep value can obtain a value within the convergence threshold when installed on the wind turbine generator set. If a value within the convergence threshold is obtained, the desired blade design model can be obtained according to the initial sweep value Y0 and the initial installation rotation angle R0, that is, the initial sweep value Y0 can be determined as the final sweep value Y, and the initial installation rotation angle R0 can be determined as the final installation rotation angle R.

[0058] If the initial sweep value Y0 is not within the convergence threshold, the installation rotation angle and / or the initial pre-bend value X0 are adjusted within the numerical range of the installation rotation angle until the sweep value Y within the convergence threshold is obtained.

[0059] That is to say, the installation rotation angle R and / or the initial pre-bending value X0 can be adjusted and iterated until a sweep value Y that meets the requirements of the wind turbine's load reduction rate, power generation and blade aerodynamic performance is obtained, and the pre-bending value X of the blade in the mold posture can be determined by reverse deduction based on the sweep value Y, thereby obtaining the designed blade model.

[0060] In fact, the above process of obtaining the sweep value Y within the convergence threshold is actually a process of calculating and verifying the design model of the blade with different sweep values ​​and installation rotation angles. In this process, the installation rotation angle R and the sweep value Y are continuously optimized according to the calculation and verification results, and the optimized installation rotation angle and the optimized sweep value are determined as the new installation rotation angle and the new sweep value, and the pre-bending value of the corresponding blade in the mold posture is determined again, until the design model of the blade that meets the design parameter range of the wind turbine generator set is obtained.

[0061] In an optional embodiment of the present invention, the step of determining the main beam positioning and the web positioning of the blade in the mold posture according to the pre-bending value X comprises: after obtaining the pre-bending value X, determining the chord length position of the blade in the two airfoil sections in the mold posture, so that the main beam is laid in a straight line along the span direction of the blade in the mold posture;

[0062] According to the positioning of the main beam and the distance between the web and the center line of the main beam, the web positioning is determined so that the web is arranged in the vertical direction under the mold posture.

[0063] Since the laying position of the main beam will affect the load reduction rate and power generation of the blade, when the main beam is laid close to the leading edge, the load reduction effect will be better, and when the main beam is laid close to the trailing edge, the power generation will be increased. Therefore, according to the design requirements, it can be determined whether the blade main beam is closer to the leading edge or the trailing edge of the blade as a whole. Therefore, according to another embodiment of the blade design method of the present invention, based on the above-mentioned design method steps, it also includes verifying the main beam position and then generating a design model of the blade.

[0064] That is to say, in the step of judging whether the sweep value meets the convergence threshold and in the step of calculating and verifying the design model of the blade according to the design parameters of the wind turbine generator set, the influence of the blade structure (main beam laying position and web position) is taken into account.

[0065] The blades obtained by the above blade design method can obtain the desired sweep value and pre-bend value, realize the load reduction function of the wind turbine generator set, and can also be manufactured according to the process of unswept blades, which simplifies the manufacturing process and improves the process feasibility.

[0066] Another aspect of the present invention further provides a blade obtained by the above blade design method, wherein the blade has a second zero-degree attitude line 20 whose included angle with the first zero-degree attitude line 10 is the above installation rotation angle R.

[0067] Another aspect of the present invention can also provide a wind turbine generator set, which includes a hub and a blade obtained by the above blade design method, and the blade is installed by aligning the second zero-degree attitude line with the zero-degree reference line on the hub, so that the blade has a desired pre-bend value and sweep value in the installed attitude. The pre-bend value X' of the blade in the installed attitude can be expressed by the following formula: X'=X*cos(R)= Y / sin(R)*cos(R).

[0068] According to the blade design method of the present invention, the swept design of the blade is obtained by turning the angle, and the blade pre-bending and swept back are coupled to make the blade main beam linearly placed in the blade mold without bending along the swept back curve. Therefore, the blade is more feasible in terms of process, and the problem of blade stiffness reduction caused by the main beam fiber can be avoided, and the stiffness characteristics of the main beam material can be maintained to the greatest extent.

[0069] In addition, according to the blade design method of the present invention, it is easier to model and calculate the optimization, and the swept design can be achieved without complex structural adjustments each time, which greatly speeds up the calculation iteration efficiency of the blade.

[0070] The embodiments of the present application are described above, but those skilled in the art may make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. However, it should be understood that, in the opinion of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present application defined by the claims.

Claims

1. A blade design method, characterized in that: The blade design method comprises: Determine the installation rotation angle R and sweep value Y of the blades according to the design parameters of the wind turbine generator set. The blade has a first zero-degree attitude line (10), and the installation rotation angle R is the angle between the first zero-degree attitude line (10) and a zero-degree reference line on the wind turbine generator set; Determine the pre-bending value X of the blade in the mold posture according to the corresponding relationship between the sweep value Y, the installation rotation angle R and the pre-bending value X of the blade in the mold posture; Determine the main beam positioning and web positioning of the blade in the mold posture according to the pre-bending value X, and obtain the design model of the blade. The step of determining the installation rotation angle R and the sweep value Y of the blades according to the design parameters of the wind turbine generator set comprises: Setting an initial pre-bending value X0 of the blade in the mold posture and setting an initial installation rotation angle R0; Determining an initial sweep value Y0 according to an initial pre-bend value X0 and an initial installation rotation angle R0 of the blade; Determine whether the initial sweep value Y0, the initial pre-bend value X0 and the initial installation rotation angle R0 meet the design parameters of the wind turbine generator set; The sweep value and the installation rotation angle that meet the design parameters of the wind turbine generator set are determined as the sweep value Y and the installation rotation angle R.

2. The blade design method according to claim 1, characterized in that: The installation rotation angle R and the initial installation rotation angle R0 have a value range of 2° to 10°, and The initial sweep value Y0 is determined according to the aerodynamic performance design parameters of the blade, the power design parameters of the wind turbine generator set and the initial installation rotation angle R0.

3. The blade design method according to claim 2, characterized in that: The step of judging whether the initial sweep value Y0, the initial pre-bend value X0 and the initial installation rotation angle R0 meet the design parameters of the wind turbine generator set comprises: Determine whether the initial sweep value Y0 is within a convergence threshold; 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 installation rotation angle R0 is determined as the installation rotation angle R.

4. The blade design method according to claim 3, characterized in that: If the initial sweep value Y0 is not within the convergence threshold, the installation rotation angle and / or the initial pre-bend value X0 are adjusted within the numerical range of the installation rotation angle until the sweep value Y within the convergence threshold is obtained.

5. The blade design method according to claim 2, characterized in that: The step of determining the sweep value Y also includes: performing aerodynamic simulation on the blade with the initial pre-bend value X0 and the initial installation rotation angle R0 to obtain the sweep values ​​at multiple positions; The initial sweep value Y0 of the blade at each position in the span direction is obtained by a spline curve fitting method.

6. The blade design method according to claim 1, characterized in that: The corresponding relationship among the sweep 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).

7. The blade design method according to claim 1, characterized in that: The sweep value Y and the pre-bend value X respectively include corresponding sweep values ​​Y and pre-bend values ​​X at a plurality of positions corresponding to a plurality of airfoil sections in the span direction of the blade.

8. The blade design method according to claim 1, characterized in that: The blade design method further comprises: after obtaining the design model of the blade, calculating and checking the design model of the blade according to the design parameters of the wind turbine generator set.

9. The blade design method according to claim 8, characterized in that: The blade design method further includes optimizing the installation rotation angle R and the sweep value Y according to the calculation and verification results, and determining the optimized installation rotation angle and the optimized sweep value as the installation rotation angle R and the sweep value Y; The pre-bending value of the blade in the mold posture is determined again until a design model of the blade that meets the design parameter range of the wind turbine generator set is obtained.

10. The blade design method according to any one of claims 1 to 9, characterized in that: The step of determining the main beam positioning and web positioning of the blade in the mold posture according to the pre-bending value X comprises: After obtaining the pre-bending value X, determining the chord length position of the blade in the two airfoil sections in the mold posture, so that the main beam is laid in a straight line along the span direction of the blade in the mold posture; According to the positioning of the main beam and the distance between the web and the center line of the main beam, the positioning of the web is determined so that the web is arranged in the vertical direction under the mold posture.

11. A blade, characterized in that: The blade is a final designed blade obtained by the blade design method according to any one of claims 1 to 10, The blade has a second zero-degree attitude line (20), and the 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 turbine generator set, characterized in that: The wind turbine generator set comprises a hub and a blade as claimed in claim 11, The blade is installed by aligning the second zero-degree attitude line (20) with the zero-degree reference line on the hub.

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