A wind power blade web profile line calculation method

Abstract

This invention provides a method for calculating the web profile of a wind turbine blade. The method comprises the following steps: S1, obtaining profile data for the web bonding position on the first or second shell, where the profile data consists of the coordinates of points on the curve; S2, calculating the layup thickness data of the first or second shell and the pultruded plate at the web bonding position; S3, determining the adhesive thickness data for bonding the web to the first or second shell according to requirements; S4, calculating the gap size between the pultruded plate below the web and the first or second shell, thereby obtaining the main beam cap thickness correction value; and S5, obtaining the web profile data. This method for calculating the web profile of a wind turbine blade corrects web profile deviations and ensures accurate main beam cap correction, resulting in a close fit between the main beam cap end face and the inner curved surface of the shell, reducing the gap between them and improving the structural strength of the wind turbine blade.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine blade manufacturing, and in particular relates to a method for calculating the web profile of a wind turbine blade. Background Technology

[0002] Wind turbine blades are mainly composed of three structural components: shell, main beam cap, and web. The two sides of the web need to be adapted to the shape of the two sides of the shell. Therefore, it is necessary to obtain the web profile data, that is, the shape and size change data of the two sides of the web along the blade axis, in order to produce a web with qualified dimensions.

[0003] In production, the web profile data is typically obtained by calculating the shell ply thickness and the main beam cap ply thickness based on the 3D model of the shell. The conventional method for manufacturing the main beam cap is to lay fiberglass cloth in the main beam cap mold, vacuum inject resin, and then cure it. At this point, the fiberglass cloth is tightly fitted to the main beam cap mold, and the main beam cap ply thickness is the same as the main beam cap thickness. When calculating the web profile, only the shell ply thickness and the main beam cap thickness need to be considered.

[0004] With technological advancements, the pultruded plate process has gradually replaced the original method for creating main beam caps. The pultruded plate process involves first pultruding glass fiber and resin to obtain a long strip of pultruded sheet of a certain width. Then, multiple pultruded sheets are laid on a main beam cap mold according to design requirements and poured to form the cap. Because the pultruded sheet is a flat plate, it lacks a surface shape that conforms to the main beam cap mold and possesses a certain degree of rigidity. This makes it difficult for the pultruded sheet to fit tightly against the mold. Therefore, after using the pultruded plate process, a gap appears between the bottommost pultruded sheet and the main beam cap mold, forming a resin-rich area after pouring. Consequently, the final thickness of the main beam cap is thicker than the pultruded plate layup thickness. The original calculation method for the web profile did not account for this gap, leading to deviations in the web profile calculation. Summary of the Invention

[0005] In view of this, the present invention aims to propose a method for calculating the web profile of wind turbine blades, in order to solve the problem that the existing web profile calculation method does not take into account the existence of this gap value, resulting in deviations in the web profile calculation.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A wind turbine blade includes a first shell and a second shell connected to one side thereon. The first shell is the windward side of the wind turbine blade, and the second shell is the leeward side of the wind turbine blade. Web plates are provided on the inner sides of the first shell and the second shell, respectively, and the two ends of the web plates are fixedly connected to the inner sides of the first shell and the second shell via main beam caps. A method for calculating the web profile of a wind turbine blade includes the following steps:

[0008] S1. Based on the three-dimensional model of the wind turbine blade, obtain the profile data of the corresponding web bonding position on the first or second shell. The profile data is the coordinates of each point on the curve.

[0009] S2. Calculate the layup thickness data of the first shell or second shell and pultruded plate at the web bonding location based on the layup process of the first shell or second shell and pultruded plate.

[0010] S3. Staff members determine the adhesive thickness data for bonding the web plate to the first or second shell according to requirements.

[0011] S4. Based on the three-dimensional model of the main beam cap mold, the pultruded plate layup thickness and the pultruded plate laying position, calculate the gap size between the pultruded plate under the web and the first shell or the second shell, thereby obtaining the main beam cap thickness correction value.

[0012] S5. Based on the shell 3D model, shell ply thickness data, pultruded plate ply thickness data, adhesive thickness data, and main beam cap thickness correction value, obtain the web profile data.

[0013] Furthermore, the method for obtaining the main beam cap correction value includes the following steps:

[0014] A1. In the 3D model, draw the edge line of the main beam cap, i.e. the edge line of the pultruded plate, on the main beam cap mold at the position corresponding to the main beam cap.

[0015] A2. Offset the edge line of the pultruded plate along the normal vector on the surface of the main beam cap mold. The offset amount is the width of the pultruded plate. Obtain the edge line position of each pultruded plate in the bottom layer, thereby forming the pultruded plate model.

[0016] A3. Take section A every a meters along the axial direction to obtain several sections A;

[0017] A4. Measure the gap size between the pultruded plate below the web and the main beam cap mold in each cross-sectional view, and linearly fit the gap size at each axial position to obtain the main beam cap thickness correction value.

[0018] Compared with the prior art, the wind turbine blade web profile calculation method of the present invention has the following beneficial effects: After the implementation of the method, the web profile deviation is corrected, the main beam cap correction value is accurate, the end face of the main beam cap fits with the inner curved surface of the shell, the gap between the two is reduced, and the structural strength of the wind turbine blade is improved. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the wind turbine blade according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the second shell assembly web and main beam cap according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the main beam cap section using the pultruded plate process described in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the second housing and the pultruded plate according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-First shell; 2-Second shell; 3-Web; 4-Main beam cap; 5-Blade root; 6-Blade tip; 7-Pultruded plate; 8-Correction value; 9-Main beam cap mold; 10-Web angle; 11-Bond thickness; 12-Layup thickness. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] like Figure 1-4 As shown, the wind turbine blade includes a first shell 1 and a second shell 2 connected to one side. The first shell 1 is the windward side of the wind turbine blade, and the second shell 2 is the leeward side of the wind turbine blade. A web plate 3 is provided on the inner side of the first shell 1 and the inner side of the second shell 2. The two ends of the web plate 3 are fixedly connected to the inner side of the first shell 1 and the inner side of the second shell 2 respectively through a main beam cap.

[0031] A method for calculating the type 3 curve of the web of a wind turbine blade includes the following steps:

[0032] S1. Based on the three-dimensional model of the wind turbine blade, obtain the profile data of the bonding position of the web 3 on the first shell 1 or the second shell 2. The profile data is the coordinates of each point on the curve.

[0033] S2. Based on the layup process of the first shell 1 or the second shell 2 and the pultruded plate 7, calculate the layup thickness 12 of the first shell 1 or the second shell 2 and the pultruded plate 7 at the bonding position of the web 3.

[0034] S3. Staff members determine the adhesive thickness data for bonding the web 3 to the first shell 1 or the second shell 2 according to the requirements.

[0035] S4. Based on the three-dimensional model of the main beam cap mold, the ply thickness 12 of the pultruded plate 7 and the plying position of the pultruded plate 7, calculate the gap size between the pultruded plate 7 below the web 3 and the first shell 1 or the second shell 2, and thus obtain the main beam cap thickness correction value 8.

[0036] S5. Based on the shell 3D model, shell ply thickness 12 data, pultruded plate 7 ply thickness 12 data, adhesive thickness data, and main beam cap thickness correction value 8, obtain the profile data of web 3.

[0037] The method for obtaining the main beam cap correction value 8 includes the following steps:

[0038] A1. In the 3D model, draw the edge line of the main beam cap on the main beam cap mold corresponding to the position of the main beam cap, that is, the edge line of the pultruded plate 7.

[0039] A2. Offset the edge line of pultruded plate 7 along the normal vector on the surface of the main beam cap mold. The offset amount is the width of pultruded plate 7. Obtain the edge line position of each pultruded plate 7 in the bottom layer, thereby forming the pultruded plate 7 model.

[0040] A3. Take section A every a meters along the axial direction to obtain several sections A;

[0041] A4. Measure the gap size between the pultruded plate 7 below the web 3 and the main beam cap mold in each cross-sectional view, and linearly fit the gap size at each axial position to obtain the main beam cap thickness correction value 8.

[0042] like Figure 2 As shown, the curvature at blade tip 6 is relatively large, and the error value of pultruded plate 7 is relatively large. Therefore, a typical value at blade tip 6 is used as an example. The blade model is the outer shape of the second shell 2. To calculate the profile of web 3, the shell coordinates of web 3 position ± the shell on the upper and lower sides of web 3, the thickness of the main beam cap, the correction thickness of pultruded plate 7, and the bonding thickness are required. Figure 4 As shown, the thickness of the second shell 2 and the main beam cap is the total thickness of the layup calculated based on the number of fabric layers. This thickness is in the normal direction and needs to be calculated as the thickness in the web 3 direction based on the angle of the web 3 (the angle of the web 3 can be calculated based on known data, and will not be elaborated on unless otherwise specified). The thickness of the pultruded plate 7 is corrected by measuring key points in the model, and approximate values ​​are taken for other points. The bonding thickness is 6 mm at all positions. The following three parts are the final web 3 profile data.

[0043] Table 1: Correction data for the second shell in the 3D model

[0044]

[0045] Table 2: Correction data for the first shell in the 3D model

[0046]

[0047]

[0048] Table 3: Final Web Profile Data

[0049] SS PS SS web angle PS abdominal angle -2995.974083 -3347.90672 99.80280643 91.73768756 -3104.823497 -3444.909973 99.97729459 91.65590118 -3216.072412 -3545.003324 100.141997 91.57171409 -3328.635158 -3646.135954 100.2779118 91.5001595 -3444.148628 -3749.508264 100.3703262 91.46366 -3558.076634 -3857.166659 99.83947638 90.79035084 -3670.366498 -3967.572391 99.24701203 90.05637127 -3791.385652 -4080.31266 98.57989296 89.28690837 -3916.02305 -4197.993177 98.0496246 88.66944804 -4042.995097 -4315.450014 97.48870282 87.91548282 -4171.754784 -4436.054871 96.58221831 86.86863774 -4304.595541 -4559.214024 95.5666342 85.77048326 -4440.899905 -4684.747031 94.48768583 84.63503879 -4579.905712 -4814.656411 93.31809206 83.46129103 -4723.360506 -4946.396753 92.40711301 82.42996476 -4868.268419 -5083.701072 91.80512243 81.77874304 -5019.290412 -5215.348219 91.33221985 81.50429045 -5174.731423 -5343.933074 91.51855208 81.91648616

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for calculating the web profile of a wind turbine blade, the wind turbine blade comprising a first shell (1) and a second shell (2) connected to one side thereof, wherein the first shell (1) is the windward side of the wind turbine blade, the second shell (2) is the leeward side of the wind turbine blade, a web (3) is provided on the inner side of the first shell (1) and the inner side of the second shell (2), and the two ends of the web (3) are respectively fixedly connected to the inner side of the first shell (1) and the inner side of the second shell (2) through a main beam cap (4), characterized in that: The web profile calculation method includes the following steps: S1. Based on the three-dimensional model of the wind turbine blade, obtain the profile data of the bonding position of the web (3) on the first shell (1) or the second shell (2). The profile data is the coordinates of each point on the curve. S2. Based on the layup process of the first shell (1) or the second shell (2) and the pultruded plate (7), calculate the layup thickness (12) data of the first shell (1) or the second shell (2) and the pultruded plate (7) at the bonding position of the web (3); S3. Staff members formulate adhesive thickness data for bonding the web (3) to the first shell (1) or the second shell (2) according to the requirements. S4. Based on the three-dimensional model of the main beam cap mold (9), the ply thickness (12) of the pultruded plate (7) and the ply position of the pultruded plate (7), calculate the gap size between the pultruded plate (7) below the web (3) and the first shell (1) or the second shell (2), thereby obtaining the thickness correction value (8) of the main beam cap (4). S5. Based on the three-dimensional model of the first shell (1) or the second shell (2), the shell ply thickness (12) data, the pultruded plate (7) ply thickness (12) data, the adhesive thickness data, and the main beam cap thickness correction value (8), obtain the profile data of the web plate (3). The method for obtaining the main beam cap correction value (8) includes the following steps: A1. In the three-dimensional model, draw the edge line of the main beam cap on the main beam cap mold corresponding to the position of the main beam cap, that is, the edge line of the pultruded plate (7); A2. Offset the edge of the pultruded plate (7) along the normal vector on the surface of the main beam cap mold. The offset amount is the width of the pultruded plate (7). Obtain the edge position of each pultruded plate (7) in the bottom layer, thereby forming the pultruded plate (7) model. A3. Take section A every a meters along the axial direction to obtain several sections A; A4. Measure the gap size between the pultruded plate (7) below the web (3) and the main beam cap mold in each cross section, and linearly fit the gap size at each axial position to obtain the main beam cap thickness correction value (8).

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