Wind turbine tower and preparation method thereof

Abstract

The present invention provides a wind turbine tower and a preparation method thereof, wherein the transverse cross-section edge of the tower is arranged as a periodic concave-convex groove structure, wherein stable vortices can be generated in the tooth grooves of the periodic concave-convex groove structure, and the existence of the vortices reduces the wall stress, thereby reducing the aerodynamic resistance, and the periodic concave-convex groove structure also lengthens the length of the flow wake, reduces the pulsation intensity of the far-field wake region, and suppresses vortex shedding, thereby reducing the pulsation resistance and the flutter of the tower, so that the wind turbine can stand in a wind field with strong wind, thereby solving the problem of the stability of the wind turbine tower and improving the safety and service life of the wind turbine.

Description

Technical Field

[0001] The invention belongs to the technical field of wind turbine towers, and in particular to a wind turbine tower and a preparation method thereof. Background Art

[0002] The tower is the main load-bearing component of the wind turbine, so the tower of the wind turbine, as a key component of the wind turbine, plays a key role in the service life of the wind turbine. With the continuous occurrence of wind turbine collapse incidents, the stability of the wind turbine tower has also received more and more attention. Therefore, improving the stability of the tower structure is of great significance for the safe operation of wind turbines. At present, the tower is a steel structure and a reinforced concrete structure. In order to improve the stability of the tower structure, two methods are often used. One is a strengthening design method of setting reinforcing ribs on the inner wall of the tower, such as the number of reinforcements, the size of reinforcements, etc.; the other method is to set a rigid structure on the outside of the tower to limit the left and right swing of the tower. Although both of the above methods have reinforced the tower, the above methods also have certain disadvantages. Because the amount of steel used in the tower is also increasing during the strengthening process, the manufacturing cost and volume weight of the tower have increased, which also brings inconvenience to the installation. The above method also does not consider the design and manufacture of the wind turbine tower from the perspective of fluid dynamics, and does not fundamentally solve the stability problem of the wind turbine tower. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a wind turbine tower and a preparation method thereof, and a periodic concave-convex groove structure is made on the edge of the transverse section of the tower. The structure has a good shock-absorbing mechanism, has a certain drag reduction effect on the flow around the column, can slow down the vortex-induced oscillation of the column, and further improve the design level of the wind turbine and the performance of the developed products.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a wind turbine tower, wherein the edge of the transverse section of the tower is a periodic concave-convex groove structure, wherein the periodic concave-convex groove structure is a closed curve obtained by scaling and circularly arranging a concave-convex groove fitting curve, and the concave-convex groove fitting curve is obtained by connecting the lowest point on one side of the convex fitting curve and the highest point on one side of the concave fitting curve.

[0005] Furthermore, the fitting curve equations of the convex fitting curve and the concave fitting curve are:

[0006]

[0007] Among them, k is the difference coefficient, k = 0.1-2; y1 = -0.15738x1 2 +2.13955x1-2.034,0≤x1≤13.4; y2=0.30836x2 2-2.15702x2+3.75654,0≤x2≤7.

[0008] Furthermore, the convex fitting curve and the concave fitting curve are obtained by extracting the cross-sectional shape contour of the periodic concave-convex grooves of the giant saguaro cactus and performing curve fitting.

[0009] Furthermore, the scaling factor j of the concave-convex groove fitting curve is determined by the vertical distance H between the highest point of the convexity and the lowest point on the left side of the convexity in the convex fitting curve and the transverse cross-sectional size of the tower.

[0010] The present invention also provides a method for preparing a wind turbine tower, the specific steps of which are as follows:

[0011] S1 uses concentric tooth top circle, center circle and tooth root circle to divide the cross-sectional shape contour of the periodic concave-convex groove of the giant saguaro cactus, extracts multiple convex shape curves between the tooth top circle and the center circle, and extracts multiple concave shape curves between the center circle and the tooth root circle;

[0012] S2 uses the average shape curves of the plurality of convex shape curves and the plurality of concave shape curves as the convex characteristic curve and the concave characteristic curve respectively;

[0013] S3 respectively fits the characteristic points of the convex characteristic curve and the concave characteristic curve to obtain a convex fitting curve and a concave fitting curve, and connects the lowest point on one side of the convex fitting curve and the highest point on one side of the concave fitting curve to obtain a bionic concave-convex groove fitting curve;

[0014] S4 scales the bionic concave-convex groove fitting curve according to the scaling factor j, and then performs a circular array to obtain the simulated saguaro cactus cross-sectional profile, so that the edge shape of the tower transverse section is the same as the simulated saguaro cactus cross-sectional profile, thus obtaining the simulated saguaro cactus tower.

[0015] Furthermore, in S2, multiple convex shape curves and multiple concave shape curves are respectively rotated onto the same rotation axis to obtain a convex shape curve set and a concave shape curve set, and the most central averaged shape curves in the convex shape curve set and the concave shape curve set are selected as the convex feature curve and the concave feature curve, respectively.

[0016] Furthermore, in S2, with the center of the characteristic circle as the rotation center and the line connecting the highest point of the convex shape curve and the center of the characteristic circle as the rotation axis of the convex shape curve, each convex shape curve is rotated, and the rotation axes of each convex shape curve are rotated and overlapped to obtain a convex shape curve set; the above operation is repeated for the concave shape curve to obtain a concave shape curve set.

[0017] Furthermore, in S3, an inverse reconstruction method is used to extract feature points of the convex feature curve and the concave feature curve, and nonlinear curve fitting is performed to obtain a convex fitting curve and a concave fitting curve, and the convex fitting curve and the concave fitting curve are scaled according to the sizes of the convex feature curve and the concave feature curve.

[0018] Further, in S3, the fitting curve equations of the convex fitting curve and the concave fitting curve are:

[0019]

[0020] Among them, k is the difference coefficient, k = 0.1-2; y1 = -0.15738x1 2 +2.13955x1-2.034,0≤x1≤13.4; y2=0.30836x2 2 -2.15702x2+3.75654,0≤x2≤7.

[0021] Furthermore, in S4, the calculation formula of the scaling factor j is:

[0022]

[0023] Wherein, R is the radius of the conventional wind turbine tower; h is the vertical distance between the top circle and the center circle; the distance between the highest point of the convex and the lowest point on the left side of the convex in the convex fitting curve is H; r1 is the radius of the top circle; r is the radius of the center circle; r2 is the radius of the root circle; r1 = (1.05-1.1) * r, r2 = 2r-r1; k is the difference coefficient, k = 0.1-2; a, b, c are the coefficients of the fitting curve equation y1 of the convex fitting curve: a = -0.15738, b = 2.13955, c = -2.034, y1 = -0.15738x1 2 +

[0024] 2.13955x1-2.034,0≤x1≤13.4.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] The present invention provides a wind turbine tower, wherein the edge of the transverse section of the tower is a periodic concave-convex groove structure, and stable vortices can be generated in the tooth grooves of the periodic concave-convex groove structure. The existence of the vortex reduces the wall stress, thereby reducing the aerodynamic resistance, and the periodic concave-convex groove structure also lengthens the length of the flow wake, reduces the pulsation intensity of the far-field wake area, and suppresses vortex shedding, which reduces the pulsation resistance and the flutter of the tower, so that the wind turbine can stand in a wind field with strong wind, solves the stability problem of the wind turbine tower, and improves the safety and service life of the wind turbine.

[0027] In order to fundamentally solve the tower stability problem, people have found that bionics, as a link between nature and science, can be applied to the design and manufacture of wind turbine towers, providing new ideas and methods for the design and manufacture of wind turbines. Therefore, the present invention extracts the tooth-shaped groove shape of the edge of the giant saguaro cactus cross section and applies it to the design and manufacture of wind turbine towers, further improving the design level of wind turbines and the performance of developed products.

[0028] The present invention also provides a method for preparing a wind turbine tower, wherein a plurality of single-period convex-convex grooves are extracted to obtain a plurality of single-period convex-convex shape curves and a plurality of single-period convex-convex shape curves, and the plurality of single-period convex-convex grooves are averaged to finally obtain a concave-convex groove fitting curve, and a saguaro-simulated cross-sectional profile that can reflect the cross-sectional profile of the periodic concave-convex grooves of the saguaro cactus is obtained by scaling and circularly arranging the concave-convex groove fitting curve, and the saguaro-simulated cross-sectional profile is applied to the design and manufacture of the wind turbine tower. Compared with a cylindrical wind turbine tower, the structure of the saguaro-simulated wind turbine tower with toothed grooves on the surface can further reduce the aerodynamic resistance suffered by the wind turbine tower, reduce the flutter of the tower, and enable the wind turbine to stand in a wind field with strong wind, thereby solving the problem of the stability of the wind turbine tower and improving the safety and service life of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The cross-sectional shape characteristic diagram of the giant saguaro cactus selected for the present invention;

[0030] Figure 2 Characteristic circle diagram of the cross section of the giant saguaro cactus selected for the present invention;

[0031] Figure 3 The convex shape diagram of the cross section of the giant saguaro cactus selected for the present invention;

[0032] Figure 4 The concave shape diagram of the cross section of the giant saguaro cactus selected for the present invention;

[0033] Figure 5 The convex characteristic line diagram of the cross section of the giant saguaro cactus selected for the present invention;

[0034] Figure 6 The concave characteristic line diagram of the cross section of the giant saguaro cactus selected for the present invention;

[0035] Figure 7 The convex fitting diagram of the cross section of the giant saguaro cactus selected for the present invention;

[0036] Figure 8The concave fitting diagram of the cross section of the giant saguaro cactus selected for the present invention;

[0037] Fig. 9 The convex-upper and concave-lower fitting diagram of the cross section of the giant saguaro cactus selected by the present invention;

[0038] Fig.10 The fitting cross-section diagram of the imitation saguaro cactus selected for the present invention;

[0039] Fig.11 The front view of the imitation giant saguaro cactus tower selected for the present invention;

[0040] Fig.12 A side view of a saguaro cactus-like tower selected for the present invention;

[0041] Fig.13 The front and side views of a conventional wind turbine tower;

[0042] Fig.14 A comparison diagram of a wind turbine with a saguaro-like tower selected for the present invention and a conventional wind turbine;

[0043] In the attached drawings: 1- tooth top circle, 2- center circle, 3- tooth root circle, 4- center of characteristic circle, 5- tooth top circle radius r1, 6- center circle radius r, 7- tooth root circle radius r2, 8- convex shape curve, 9- concave shape curve, 10- highest point of convex shape curve, 11- rotation axis of convex shape curve, 12- convex shape curve set, 13- convex characteristic curve, 14- lowest point on the left side of convex characteristic curve, 15- lowest point on the right side of convex characteristic curve, 16- lowest point of concave shape curve, 17- rotation axis of concave shape curve, 18- concave shape curve set, 19- concave characteristic curve, 20- concave characteristic curve 1-the highest point on the left side of the line, 21-the highest point on the right side of the concave characteristic curve, 22-the distance H between the highest point of the convex in the convex fitting curve and the lowest point on the left side of the convex, 23-the vertical distance h between the top circle and the center circle, 24-the radius of the conventional wind turbine tower, 25-the cross section of the conventional wind turbine tower, 26-the imitation giant saguaro tower, 27-the conventional wind turbine tower, 28-the convex fitting curve, 29-the concave fitting curve, 30-the concave-convex groove fitting curve, 31-the imitation giant saguaro cross section, 32-the imitation giant saguaro cross section line, 33-the lowest point of the concave characteristic curve, 34-the highest point of the convex characteristic curve. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] The present invention provides a wind turbine tower, wherein the edge of the transverse cross-section of the tower is a periodic concave-convex groove structure, wherein the shape of the periodic concave-convex groove structure is a closed curve shape obtained by scaling and circular arraying a concave-convex groove fitting curve 30, wherein the concave-convex groove fitting curve 30 is obtained by connecting the lowest point on one side of the convex fitting curve 28 and the highest point on one side of the concave fitting curve 29, and the fitting curve equations of the convex fitting curve 28 and the concave fitting curve 29 are:

[0046]

[0047] Among them, k is the difference coefficient, k = 0.1-2; y1 = -0.15738x1 2 +2.13955x1-2.034,0≤x1≤13.4; y2=0.30836x2 2 -2.15702x2+3.75654,0≤x2≤7.

[0048] The above-mentioned concave-convex groove fitting curve 30 is obtained by extracting the cross-sectional shape contour of the periodic concave-convex groove of the giant saguaro cactus through the method of extracting contour feature points; then the characteristic lines corresponding to the contour feature points of a single period are averaged and curve fitted to finally obtain the concave-convex groove fitting curve 30, and the concave-convex groove fitting curve 30 is circularly arrayed and scaled to obtain a closed cactus periodic concave-convex groove line that can reflect the cross-sectional shape contour of the periodic concave-convex groove of the giant saguaro cactus. The cactus periodic concave-convex groove line is applied to the design and manufacture of wind turbine towers to obtain a wind turbine tower imitating the giant saguaro cactus.

[0049] like Fig.11 , 12 As shown, the shape of the imitation saguaro cactus tower tube is designed according to the concave-convex characteristics of the cross section of the saguaro cactus. As a tall cylindrical plant that lives in the harsh environment of the desert, the saguaro cactus can be as high as 20 meters, but its diameter is very small relative to its height. Its cylindrical outer surface is distributed with concave-convex tooth-shaped grooves. Facing the severe wind and sand environment of the desert, it can still stand firm in the desert area with very strong winds and has good rigid-flexible coupling, which is related to the periodic concave-convex tooth-shaped groove structure on its surface.

[0050] Because the concave and convex tooth-shaped groove structure on the surface of the giant saguaro cactus can reduce the aerodynamic drag on its column, and the column with the concave and convex tooth-shaped groove structure on the surface of the giant saguaro cactus can withstand a small amplitude of pulsating drag, which can effectively reduce the amplitude of pulsating drag. In addition, vortices will form in the grooves of the concave and convex tooth-shaped groove structure on the surface of the giant saguaro cactus, weakening the wall stress, so that the column with the concave and convex tooth-shaped groove structure on the surface of the giant saguaro cactus has a better drag reduction effect than ordinary cylinders, and its vibration reduction effect is also better than that under ordinary column conditions. Therefore, the concave and convex tooth-shaped groove structure on the surface of the columnar cactus is the key to its resistance to strong winds in desert areas with strong winds. As a device that can convert wind energy into electrical energy installed on sparsely populated seas and lands, the wind turbine faces a strong wind environment. High wind speeds can cause violent vibrations of the tower, affecting the safe and stable operation of the wind turbine. Therefore, based on the good aerodynamic characteristics of the surface structure of the giant saguaro cactus, the present invention selects the concave and convex tooth-shaped groove structure on the surface of the giant saguaro cactus to replace the conventional columnar circular cross-sectional structure for bionic design. The cross-sectional shape of the giant saguaro cactus is as follows: Figure 1 shown.

[0051] The present invention also provides a method for preparing a wind turbine tower. In order to obtain the tooth-shaped groove structure characteristics of the giant saguaro cactus surface, the cross-sectional profile of the giant saguaro cactus is extracted. According to the cross-sectional shape profile of the periodic concave-convex grooves of the giant saguaro cactus, the tooth-shaped structure is divided into three characteristic circles: tooth top circle 1, center circle 2 and tooth root circle 3. The characteristic circles of the giant saguaro cactus cross section are as follows: Figure 2 As shown, the addendum circle 1, the center circle 2 and the root circle 3, their radii are the addendum circle radius r15, the center circle radius r6 and the root circle radius r27 respectively, wherein the center circle 2 is located at the center of the addendum circle 1 and the root circle, the addendum circle 1 is located above the center circle 2, the root circle 3 is located below the center circle 2, the centers of the three characteristic circles are all the characteristic circle center 4 at the same position, and the radius r of the center circle 2 is equal to the radius R of the conventional wind turbine tower. In order to further determine the specific positions of the addendum circle 1, the center circle 2 and the root circle 3, according to the cross-sectional shape profile characteristics of the periodic concave-convex grooves of the giant saguaro cactus, it can be determined that there is a certain proportional relationship between the three, that is, r1 = (1.05-1.1)*r, r2 = 2r-r1.

[0052] Taking the center of the characteristic circle 4 as the coordinate origin, the shape curve of the concave-convex groove structure of the giant saguaro cactus cross section is extracted by the inverse reconstruction method, including Figure 3 There are multiple convex curves 8 between the top circle 1 of the giant saguaro cactus and the center circle 2 of the giant saguaro cactus, as shown in FIG. Figure 4 A plurality of concave shaped curves 9 are shown between the saguaro cactus center circle 2 and the saguaro cactus tooth root circle 3 .

[0053] The convex shape curve 8 and the concave shape curve 9 are not parabolas of the same size and shape. In order to better obtain the averaged convex and concave shapes of the giant saguaro cactus cross section, the characteristic circle center 4 is used as the rotation center, and the line connecting the highest point 10 of the convex shape curve and the characteristic circle center 4 is used as the convex shape curve rotation axis 11. Each convex shape curve 8 is rotated, and each convex shape curve rotation axis 11 is rotated to overlap, so as to obtain a rotated convex shape curve set 12, as shown in FIG. Figure 5 As shown;

[0054] The above operation is repeated for the concave shape curve 9. With the characteristic circle center 4 as the rotation center and the line connecting the lowest point 16 of the concave shape curve and the characteristic circle center 4 as the concave shape curve rotation axis 17, each concave shape curve 9 is rotated. The concave shape curve rotation axes 17 are rotated until they overlap, and a rotated concave shape curve set 18 is obtained, as shown in FIG. Figure 6 shown.

[0055] The most central averaged shape curves of the convex shape curve set 12 and the concave shape curve set 18 are respectively selected as the convex characteristic curve 13 and the concave characteristic curve 19. The convex characteristic curve 13 and the concave characteristic curve 19 are the most representative profile features of the periodic concave-convex grooves.

[0056] The lowest point 14 on the left side of the convex characteristic curve and the lowest point 15 on the right side of the convex characteristic curve are two end points on the convex characteristic curve 13; the highest point 20 on the left side of the concave characteristic curve and the highest point 21 on the right side of the concave characteristic curve are two end points on the concave characteristic curve 19.

[0057] When extracting the characteristic points on the convex and concave characteristic curves of the giant saguaro cactus, the inverse reconstruction method is used to establish an xy coordinate system with the lowest point 14 on the left side of the convex characteristic curve as the coordinate origin to obtain the characteristic points x1 and y1 of the convex curve feature;

[0058] An xy coordinate system is established with a straight line passing through the highest point 20 on the left side of the concave characteristic curve as the y-axis and a straight line passing through the lowest point 33 of the concave characteristic curve as the x-axis to obtain characteristic points x2 and y2 of the concave characteristic curve;

[0059] Since the convex and concave characteristic curves of the concave-convex groove structure of the Saguaro cactus cross section are similar to parabolic lines, nonlinear curve fitting was performed on the convex characteristic points and the concave characteristic points.

[0060] like Figure 7 The nonlinear fitting curve corresponding to the characteristic points of the convex characteristic curve 13 of the middle giant saguaro cactus cross section is the convex fitting curve 28 of the giant saguaro cactus cross section; Figure 8The nonlinear fitting curve corresponding to the characteristic points of the concave characteristic curve 19 of the middle saguaro cactus cross section is the concave fitting curve 29 of the saguaro cactus cross section.

[0061] The obtained convex fitting curve 28 and concave fitting curve 29 of the cross section of the giant saguaro cactus are scaled according to the sizes of the convex characteristic curve 13 and the concave characteristic curve 19 of the cross section of the giant saguaro cactus, and the lowest endpoint 15 on the right side of the convex characteristic curve of the cross section of the giant saguaro cactus is connected with the highest endpoint 20 on the left side of the concave characteristic curve of the cross section of the giant saguaro cactus, or the lowest endpoint 14 on the left side of the convex characteristic curve of the giant saguaro cactus is connected with the highest endpoint 21 on the right side of the concave characteristic curve of the giant saguaro cactus, so as to obtain the concave-convex groove fitting curve 30 of the cross section of the giant saguaro cactus, as shown in FIG. Fig. 9 shown.

[0062] The fitting curve equations of the convex fitting curve 28 and the concave fitting curve 29 of the section of the giant saguaro cactus are:

[0063]

[0064] In order to make the above equation applicable to the cross-sectional profiles of giant saguaro cacti of different sizes, a difference coefficient k is introduced into the above equation, k = 0.1-2. Therefore, the equations y1 and y2 corresponding to the convex fitting curve 28 and the concave fitting curve 29 of the giant saguaro cactus cross section are y1 and y2, respectively. 1k and 2k .

[0065]

[0066] In order to apply the concave-convex groove fitting curve 30 of the giant saguaro cactus cross section to the processing and manufacturing of conventional wind turbine towers 27 of different sizes, Fig.13 It can be seen from the cross section 25 of the conventional wind turbine tower that the cross section of the conventional wind turbine tower 27 is a circle with a radius R. Therefore, the convex fitting curve and the concave fitting curve equations y for the cross sections of saguaro cacti of different sizes can be 1k and 2k Scaling is performed according to the size of a conventional wind turbine tower 27, with a scaling factor of j.

[0067] In order to determine the scaling factor j, it is necessary to associate the characteristic dimensions of the Saguaro cactus cross section with the dimensions of a conventional wind turbine tower. The dimensions of the center circle r can be determined according to the radius R of the conventional wind turbine tower, i.e., r=R. In this way, the dimensions of the addendum circle r1 and the root circle r2 can also be obtained, i.e., r1=(1.05-1.1)*r, r2=2r-r1. Since the highest point of the convex fitting curve is approximately tangent to the addendum circle, the ratio of the vertical distance h23 between the addendum circle and the center circle to the distance H22 between the highest point of the convex and the lowest point on the left side of the convex in the convex fitting curve is used as the scaling factor j. The vertical distance h between the addendum circle and the center circle is determined by the difference between the radius of the addendum circle and the center circle, i.e., h=r1-r. The distance H between the highest point of the convex and the lowest point on the left side of the convex in the convex fitting curve is determined according to the distance between the highest point 34 of the convex characteristic curve and the coordinate origin and the difference coefficient k. The ordinate of the highest point 34 of the convex characteristic curve is the distance between the highest point 34 of the convex characteristic curve and the coordinate origin: so In the equation, a, b, and c are the coefficients of the convex fitting curve y1: a=-0.15738, b=2.13955, c=-2.034.

[0068] The parameters involved in determining the scaling factor j are:

[0069] The specific relationship between the conventional wind turbine tower radius R24, the vertical distance h23 between the tooth top circle and the center circle, and the vertical distance H22 between the highest point of the convex and the lowest point of the convex side in the concave-convex groove fitting curve 30 can be expressed by the following expression:

[0070]

[0071] The curve corresponding to the concave-convex groove fitting curve 30 after j-fold scaling is a part of the final simulated giant saguaro cactus cross section 31. By forming a circular array of the concave-convex groove fitting curve 30, a complete simulated giant saguaro cactus cross section profile 32 can be obtained, as shown in FIG. Fig.10 shown.

[0072] According to the design requirements, the radius of the tower is the same as the radius of the center circle 2 on the imitation saguaro cactus cross-sectional profile 32, and the shape of the tower transverse cross-sectional edge is made the same as the shape of the imitation saguaro cactus cross-sectional profile 32, thereby obtaining the imitation saguaro cactus tower 26, and then a wind turbine with the imitation saguaro cactus tower can be manufactured;

[0073] like Fig.14As shown, the simulated saguaro cactus tower 26 is compared with the conventional wind turbine tower 28. According to the numerical simulation results, the periodic concave-convex tooth-shaped groove structure of the simulated saguaro cactus tower 26 reduces the aerodynamic drag, and the average drag coefficient is reduced by nearly 25% compared with the cylindrical tower; and the amplitude of the pulsating drag that the simulated saguaro cactus tower 26 can withstand is smaller than that of the conventional cylindrical tower body, and the amplitude of the pulsating drag can be reduced by nearly 60%. The research results show that: the tooth grooves of the simulated saguaro cactus tower 26 with a periodic concave-convex tooth-shaped groove structure generate stable vortices, and the presence of the vortices reduces the wall stress, thereby reducing the aerodynamic drag; in addition, the simulated saguaro cactus tower 26 lengthens the length of the flow wake, reduces the pulsation intensity of the far-field wake area, and the vortex shedding is suppressed, which reduces the pulsating drag.

Claims

1. A method for preparing a wind turbine tower, characterized in that: The specific steps are as follows: S1 divides the cross-sectional shape contour of the periodic concave-convex groove of the giant saguaro cactus using concentric tooth top circles (1), center circles (2) and tooth root circles (3), extracts a plurality of convex shape curves (8) between the tooth top circles (1) and the center circles (2), and extracts a plurality of concave shape curves (9) between the center circles (2) and the tooth root circles (3); S2 uses the averaged shape curves of the plurality of convex shape curves (8) and the plurality of concave shape curves (9) as the convex characteristic curve (13) and the concave characteristic curve (19); S3 respectively fits the characteristic points of the convex characteristic curve (13) and the concave characteristic curve (19) to obtain a convex fitting curve (28) and a concave fitting curve (29), and connects the lowest point on one side of the convex fitting curve (28) and the highest point on one side of the concave fitting curve (29) to obtain a bionic concave-convex groove fitting curve (30); S4 according to the scaling factor j Scaling the bionic concave-convex groove fitting curve (30), and then performing a circular array to obtain a saguaro-like cactus cross-sectional profile (32), so that the shape of the tower tube's transverse cross-sectional edge is the same as the shape of the saguaro-like cactus cross-sectional profile (32), thereby obtaining a saguaro-like cactus tower tube (26); The fitting curve equations of the convex fitting curve (28) and the concave fitting curve (29) are: in, k is the difference coefficient, k =0.1-2; ; ; The concave-convex groove fitting curve (30) is scaled by a scaling factor j The vertical distance between the highest point of the convexity and the lowest point on the left side of the convexity in the convexity fitting curve (28) is H And the transverse cross-sectional dimensions of the tower.

2. The method for preparing a wind turbine tower according to claim 1, characterized in that: In S2, a plurality of convex shape curves (8) and a plurality of concave shape curves (9) are respectively rotated onto the same rotation axis to obtain a convex shape curve set (12) and a concave shape curve set (18), and the most central averaged shape curves in the convex shape curve set (12) and the concave shape curve set (18) are selected as the convex feature curve (13) and the concave feature curve (19), respectively.

3. The method for preparing a wind turbine tower according to claim 1, characterized in that: In S2, the center of the characteristic circle (4) is used as the rotation center, and the line connecting the highest point (10) of the convex shape curve and the center of the characteristic circle (4) is used as the rotation axis (11) of the convex shape curve. Each convex shape curve (8) is rotated, and each convex shape curve rotation axis (11) is rotated and overlapped to obtain a convex shape curve set (12); the above operation is repeated for the concave shape curve (9) to obtain a concave shape curve set (18).

4. The method for preparing a wind turbine tower according to claim 1, characterized in that: In S3, the feature points of the convex feature curve (13) and the concave feature curve (19) are extracted by using the inverse reconstruction method, and nonlinear curve fitting is performed to obtain the convex fitting curve (28) and the concave fitting curve (29). The convex fitting curve (28) and the concave fitting curve (29) are scaled according to the size of the convex feature curve (13) and the concave feature curve (19).

5. The method for preparing a wind turbine tower according to claim 1, characterized in that: In S4, the scaling factor j The calculation formula is: in, R is the radius of the conventional wind turbine tower; h is the vertical distance between the top circle and the center circle; the distance between the highest point of the convex fitting curve and the lowest point on the left side of the convex H ; r 1 is the radius of the tooth tip circle; r is the radius of the center circle; r 2 is the tooth root circle radius; , ; k is the difference coefficient, k = 0.1-2; a, b, c are the fitting curve equations of the convex fitting curve (28) y The coefficients of 1: a=-0.15738, b=2.13955, c=-2.034, .

6. A wind turbine tower, characterized in that: The imitation saguaro cactus cross-sectional profile (32) is obtained by the method described in any one of claims 1 to 5, and the shape of the tower tube's transverse cross-sectional edge is made the same as the shape of the imitation saguaro cactus cross-sectional profile (32), thereby obtaining the imitation saguaro cactus tower tube (26).

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