CN117287349A

CN117287349A - Tower and self-aligned rotatable wind turbine support system

Info

Publication number: CN117287349A
Application number: CN202311517307.4A
Authority: CN
Inventors: 赵旺文
Original assignee: Hainan Qiangfeng Technology Development Co ltd
Current assignee: Hainan Qiangfeng Technology Development Co ltd
Priority date: 2023-11-14
Filing date: 2023-11-14
Publication date: 2023-12-26

Abstract

The embodiment of the invention provides a tower and a self-aligned rotatable wind turbine support system, and relates to the technical field of foundations of wind generating sets. Aims to solve the problem of high development cost of the high-capacity fan. The tower section of thick bamboo is the column, and the cross section of tower section of thick bamboo includes by arc section, first connecting wire, carbomer back of the body line and the contour line that the second connecting wire encloses in proper order end to end, and arc section, first connecting wire and second connecting wire enclose into tear drop molding or oval molding, and the opening width size of arc section of thick bamboo is big Yu Kam the opening width of back of the body line. The self-aligning rotatable wind turbine support system includes the tower described above and a rotating base. The tower cross-sectional structure is designed by aerodynamic shape to reduce longitudinal load, reduce tower weight and reduce wind load.

Description

Tower and self-aligned rotatable wind turbine support system

Technical Field

The invention relates to a support tower and foundation technology of a wind generating set, in particular to a tower barrel and a self-aligned rotatable wind turbine support system.

Background

Current wind turbines mostly employ horizontal axis turbines. The fixed base, the cylindrical tower and the active yaw control at the top of the tower are three basic elements of the current horizontal axis wind turbine support system, and the structural change is not caused basically for a long time.

In recent years, both onshore and offshore wind energy production is rapidly increasing. However, over the years of technological advances, leveling power costs (LCOE) remain relatively high, especially for offshore wind power, because specialized equipment is required to complete the construction of offshore wind turbine foundations. The most offshore wind power development projects require going to deeper waters and harsher sites than earlier, and thus leveling power costs (LCOE) are even higher.

In order to reduce the leveling electric power costs (LCOE), turbines of offshore wind farms have recently become larger. Although theoretically, as the base number decreases, the increase in turbine capacity will result in a reduction in the overall cost per megawatt of electricity. But this dependence is not a simple linear relationship, especially when selecting larger turbines results in a more expensive base form. For example, a jacket must be used instead of a mono pile foundation. Mono-piles are the cheapest form of foundation type, but as the turbines become larger, so too are their sizes, that they reach limits in terms of installation and manufacturing capacity. Thus, larger turbines or more difficult wind farms must use more expensive forms of foundations, such as jackets or more complex installation procedures. As site conditions become more challenging, water depths become deeper and costs increase which will affect the feasibility of offshore wind power development, thereby impeding the development of offshore wind power.

The use of currently popular wind turbine support systems may become a bottleneck against greater load demands due to feasibility problems of manufacturing/installation techniques and the high cost of offshore wind power development.

Disclosure of Invention

It is an object of the present invention to improve the problem of high cost development of high capacity fans by providing a tower and a self-aligning rotatable wind turbine support system.

Embodiments of the invention may be implemented as follows:

the embodiment of the invention provides a tower, which is columnar, wherein the cross section of the tower comprises an outline formed by sequentially connecting an arc section, a first connecting line, a carbomer back line and a second connecting line end to end, the arc section, the first connecting line and the second connecting line form a tear drop shape or an elliptic shape, and the opening width of the arc section is larger than that of the carbomer back line.

In addition, the tower provided by the embodiment of the invention can also have the following additional technical characteristics:

optionally, the cross section of the tower is about a line extending from the center of the arc segment to the center of the carbomer back line as a central symmetry axis.

Optionally, the first connecting line and the second connecting line are arc-shaped or straight.

Optionally, the arc section is semicircular; the opening width of the arc section is the diameter of the arc section.

Alternatively, at wind speeds of 5m/s to 50m/s, the Reynolds number is 1.125x10 ⁶ And 1.126x10 ⁷ In the range of L/D > 2.5, where L is the longest distance from the back line of the carbomer to the arc segment and D is the opening width of the arc segment.

Optionally, at reynolds number re=10 ⁵ In the case of (3), L/D > 3.9.

Embodiments of the present invention also provide a self-aligning rotatable wind turbine support system comprising a rotating base and a tower; the tower drum is rotatably arranged on the rotating base.

Optionally, the self-aligning rotatable wind turbine support system further comprises a swivel member; the tower drum is matched with the rotating base through the rotating member to form a yaw kinematic pair, the rotation center of the rotating member is coincident with the circle center corresponding to the arc section, or the rotation center of the rotating member is deviated from the circle center corresponding to the arc section, and the deviation distance is smaller than the circle radius corresponding to the arc section.

Optionally, the self-aligning rotatable wind turbine support system further comprises a nacelle; the engine room is fixedly connected with the tower barrel.

Optionally, the self-aligning rotatable wind turbine support system further comprises a passive yaw control system or a semi-active yaw control system; the passive yaw control system or the semi-active yaw control system is arranged in the rotating base and is used for performing yaw control on the nacelle and the tower.

The tower and self-aligning rotatable wind turbine support system of embodiments of the present invention may have beneficial effects including, for example:

the tower section of thick bamboo, tower section of thick bamboo are the column, and the cross section of tower section of thick bamboo includes by arc section, first connecting wire, carbomer back of the body line and the contour line that the second connecting wire encloses in proper order end to end, and arc section, first connecting wire and second connecting wire enclose into tear drop molding or oval molding, and the opening width size of arc section of thick bamboo is big Yu Kam the opening width of back of the body line.

The tower cross section structure is designed through aerodynamic shape, so that the weight of the tower is reduced, the wind load is reduced, the load of the supporting structure is reduced, the foundation construction cost of the wind turbine is reduced due to the reduction of the load, and the problem of higher development cost of the high-capacity fan is solved.

The self-aligned rotatable wind turbine support system comprises the tower and the rotating base matched with the tower, so that the problem of high development cost of a high-capacity fan of a wind turbine can be solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a tower according to the present embodiment;

FIG. 2 is a simplified cross-sectional schematic of a tower according to the present embodiment;

FIG. 3 is a simplified schematic diagram of a tower according to the present embodiment;

FIG. 4 is a schematic structural view of a self-aligning rotatable wind turbine support system provided by the present embodiment.

Icon: 100-tower drum; 110-arc segment; 120-a first connection line; 130-carbomer back line; 140-a second connecting line; 200-a self-aligning rotatable wind turbine support system; 210-a nacelle; 220-rotating the base.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

A tower 100 and a self-aligning rotatable wind turbine support system 200 provided in this embodiment are described in detail below with reference to fig. 1-4.

Referring to fig. 1 and 2, an embodiment of the present invention provides a tower 100, wherein the tower 100 is cylindrical, a cross section of the tower 100 includes a contour line formed by sequentially connecting an arc segment 110, a first connecting line 120, a kamu back line 130 and a second connecting line 140 end to end, the arc segment 110, the first connecting line 120 and the second connecting line 140 enclose a tear drop shape or an oval shape, and an opening width dimension of the arc segment 110 is Yu Kam larger than a width dimension of the back line 130. The card reader back line 130 is a straight or U-shaped line.

Specifically, the front of the tower 100 is a teardrop or oval configuration and the rear is a Kammback-carbomer, i.e., a U-shaped configuration. The front part of the tower 100 refers to the right end portion in fig. 2, and the rear part refers to the left end portion in fig. 2.

In the wind, both the fan impeller and the cylindrical tower are subjected to the thrust of the wind, and the tower transmits the wind to the underlying foundation. The wind forces experienced by the tower are mainly proportional to the so-called drag coefficient. The drag coefficient of the tubular circle is between 0.6 and 1.2, depending on the critical state defined by the reynolds number (Re). However, if it is formed into a teardrop shape or an oval tower 100, the wind resistance coefficient can be greatly reduced by up to 90%.

The drag of the tear drop shaped cross section results from surface friction effects and wake effects. To reduce drag, the tear drop design keeps the air passing through them from separating, so the wake effect is small. Coefficient of resistance C _D At Reynolds number 10 ⁶ To 10 ⁷ The range is the smallest. When the reynolds number re=10 ⁵ The ratio of length to width of the tear-drop section airfoil = 3.9 gives the drag coefficient C _D ＝0.06。

To simplify manufacture and avoid fatigue problems associated with stress concentrations at the tail, the tear-drop shaped cross-section is cut at the tail to form a straight back, like a Kammback-carbomer back, i.e., the portion of the carbomer back line 130 referred to in this embodiment.

The resistance change from cutting straight backs can be expressed by a formula related to the following total length ratio.

Referring to FIG. 1, ΔC _B For the number of wind index reductions, C _D0 For the wind index without Kammback-carbomer, ΔL is the length of Kammback-carbomer and L is the total length.

When the incision length DeltaL is about 20% of the total length L, deltaC _D =0.1, the drag coefficient varies from 0.06 to 0.16, still being significantly lower than the drag coefficient of a circle between 0.6 and 1.2.

The cross section of the tower 100 is configured as shown in fig. 1 with the tail portion al removed. Thus, the tower 100 adopts a teardrop-like and oval-like cross-sectional configuration, and is aerodynamically shaped to reduce longitudinal loading. The infrastructure cost is reduced due to the reduced load. And the manufacturing is simple, the installation is easy, and the structural overall design optimization can be performed. The interior of the tower 100 may be reserved for interior platforms, steel supports, equipment and personnel access.

Referring to fig. 1, 2 and 3, in the present embodiment, the cross section of the tower 100 is about a line extending from the center of the arc segment 110 to the center of the carbomer back line 130 as a center symmetry axis. The tower 100 is of symmetrical construction and is easy to manufacture.

Referring to fig. 1, 2 and 3, in the present embodiment, the first connection line 120 and the second connection line 140 are arc-shaped or straight.

The first connecting lines 120 and the second connecting lines 140 are symmetrically distributed, and the first connecting lines 120 and the second connecting lines 140 are plate-shell structures correspondingly arranged at two sides of the tower 100. The first connecting line 120 and the second connecting line 140 may be in an arc or in a straight line.

In the case where the first connection line 120 is in line with the second connection line 140, the tower 100 is convenient to manufacture and install, while being easy to structural optimize and weight-saving, and is considered to have a relatively small influence on the resistance coefficient.

Referring to fig. 1, 2 and 3, in the present embodiment, the arc segment 110 is a semicircular arc; the opening width of the arc segment 110 is the diameter of the arc segment 110. The adoption of the semicircular arc simplifies the manufacturing and the installation, and simultaneously, the structure is easy to optimize and the weight is reduced.

In this embodiment, the rear end is a U-shaped structure, which is easy to manufacture. The straight back plate may be rolled up with curved ends to achieve longitudinal welding away from high stress hot spots.

It should be noted that: the dimensions shown in fig. 2 represent the outer dimensions. The dimensional scale in fig. 2 is an example only, and the actual manufacturing process is not limited by this size. The final dimensions will be considered in combination with the need to balance the reduction of aerodynamic loads with the increase of bending strength of the longitudinal section, which tends to favor long and narrow sections, as well as reduced buckling resistance with longer sections and overall weight. The actual value of R in fig. 2 should be derived from the stiffness/load resistance requirement. The thickness of the tower 100 should be based on stiffness/load resistance requirements.

With reference to fig. 2 and 3, in this embodiment, the wind is in most cases directed exactly towards the circular head due to the self-alignment, so that the load and stress direction in the cross section is fixed and does not change with different wind directions, and the cross section of the tower 100 can thus be better optimized. An efficient lightweight structural design of the tower 100 can be achieved. The bending moment generated by wind force will always generate tensile stress on the circular front section and compressive stress on the carbomer back. The tension forces generated by the wind on the rounded front may counteract the compressive load generated by the weight of tower 100. The tower 100 has a higher bending strength along its long axis than the tubular section due to its narrower width. The flat edge of the straight back provides a larger cross-sectional area to resist compressive loads than the edge of the circular cross-section.

The tower 100 cross-sectional airfoil may be reduced to four easily manufactured sections, a front semicircular section, two side or curved panels, and a U-shaped straight back panel resembling a curved panel. By the simplified structure, a cost reduction is achieved, which makes the application range of the onshore and offshore wind turbine support system broader than the previous invention.

In the present embodiment, the Reynolds number is 1.125x10 at a wind speed of 5m/s to 50m/s ⁶ And 1.126x10 ⁷ In the range of (2), the optimal ratio L/D of the length L to the width D is 2.5 or more, where L is the longest distance from the card back line 130 to the arc segment 110, and D is the opening width of the arc segment 110. For wind speeds from 5m/s to 50m/s, when the diameter of the circle segment=3m, the Reynolds number is 1.125x10 ⁶ And 1.126x10 ⁷ Within a range of, i.e. about 10 ⁶ To 10 ⁷ Is not limited in terms of the range of (a). A larger aspect ratio may reduce more wind drag load, for example, an oval aspect ratio equal to 2, a drag coefficient of about 0.1, and a teardrop aspect ratio of 5.5, a drag coefficient of about 0.01. But a longer section requires more space and a narrower back requires more thickness to resist the load, potentially increasing overall weight. The large space causes problems of operability and manufacturability. These factors may lead to a decrease in overall economic efficiency. A length to width ratio of 2.5 would be a good compromise. However, this value is a reference value and is not fixed.

In this embodiment, at reynolds number re=10 ⁵ In the case of (3), L/D > 3.9. When the number re=10 ⁵ The ratio L/d=3.9 of the length to the width of the tear drop gives the smallest C _D ＝0.06。

Referring to fig. 3 and 4, embodiments of the present invention also provide a self-aligning rotatable wind turbine support system 200, comprising a rotating base 220 and a tower 100; the tower 100 is rotatably mounted on a swivel base 220.

The non-axisymmetric cross-section and the offset of the center of rotation enable self-alignment when wind is not blowing on the front of the tear drop portion. Figure 3 shows the flow and wake of wind from a 45 degree angle through the tower cross section. The total combined wind force creates a restoring moment to realign the wind direction. The tower 100 rotates by the rotation base 220 and can follow the change of the wind direction.

By combining the innovative tower 100 and swivel base 220, the use of the wind itself to align the impeller with the wind direction can reduce the load on the support structure and the weight of the structural components, thus greatly reducing the flattening electrical costs.

The wind force is utilized to restore the alignment of the wind direction and the longitudinal direction of the tower body, the transverse direction and the longitudinal direction of the section of the tower barrel form ninety degrees, and the transverse total thrust center is staggered from the rotation center of the tower barrel by a certain distance, so that the rotation moment is generated. When the moment pushes the fan to align with the wind direction, the thrust of the wind is in the same direction as the longitudinal center line and passes through the rotation center, the rotation moment is zero, and the wind is longitudinally aligned with the tower body.

The swivel base 220 provides bearing system support to provide minimal resistance to circular motion while withstanding gravity and horizontal loads and bending moments.

In this embodiment, self-aligning rotatable wind turbine support system 200 also includes a swivel member; the tower 100 forms a yaw kinematic pair through the cooperation of the rotary member and the rotary base 220, and the rotation center of the rotary member can be coincident with the circle center corresponding to the arc segment 110, or the rotation center of the rotary member deviates from the circle center corresponding to the arc segment 110 by a distance smaller than the circle radius corresponding to the arc segment 110. To ensure that the tower 100 has a restoring torque. I.e., offset distance, should ensure that the tower 100 structure has a restoring torque. For example, the center of rotation may be located away from the resultant wind center, causing wind loads on the cross-sectional side plates to create a large yaw recovery rotational moment that causes tower 100 to conform to the direction of the wind.

The center of rotation is located away from the resultant wind center, causing wind loading on the cross-sectional side panels to generate yaw recovery rotational moment that causes tower 100 to conform to the direction of the wind.

When the front of the tower 100 is not directly facing the wind, the wind will generate a force transverse to the cross section of the tower, and because the wind force on one side of the center of rotation is much greater than the wind force on the other side of the center of rotation, a rotational moment will be generated to restore the rotation of the tower 100 to align with the direction of the wind. For simplicity, the rotation center may be disposed at the center corresponding to the front circular arc line.

That is, tower 100 has the ability to self-align the wind driven fan wheel due to the asymmetric rotation and rotating base 220. When the direction of the wind changes and the central axis of the cross section is not in one direction, the wind force generates a moment to rotate the tower 100 in the same direction as the wind force, which can also be called a restoring moment, and the directions of the two sides of the central axis of the longitudinal section of the tower 100 are opposite, in this direction, the larger the deviation is, the larger the moment is, and if the deviation is zero, the moment is zero.

By the tear drop or oval cross-sectional shape, and the placement of the center of rotation of the base, the tower 100 can be aligned with the wind direction by rotation as the wind direction changes, thereby achieving self-alignment of the impeller with the wind direction.

In the present embodiment, self-aligning rotatable wind turbine support system 200 also includes nacelle 210; the nacelle 210 is fixed with respect to the tower 100. The nacelle 210 is rigidly connected to the tower 100, reducing dynamic loads at the hub.

In the present embodiment, self-aligning rotatable wind turbine support system 200 also includes a passive yaw control system or a semi-active yaw control system; disposed within the swivel mount 220 is a passive or semi-active yaw control system for yaw control of the nacelle 210 and the tower 100.

The self-alignment capability described above enables the use of a passive yaw control system on rotating bedplate 220. The rotating bedplate 220 incorporates a passive yaw control system, removes the overhead active yaw control system, overcomes disadvantages of current yaw control systems within the rotor nacelle 210 assembly, such as increasing the mass and cost of the rotor nacelle 210 assembly, introducing gyroscopic forces and torque into the support structure while applying steering forces, requiring extensive maintenance, and the overhead active yaw control system depending on the sensor and system response of the yaw control machine. When the tower 100 is employed to rotate with the wind and adjust the direction of the wind turbine's wheel according to the direction of the wind, the yaw control system may be passive without consuming the power of active yaw and a large number of wear parts, reducing the operating costs, while improving the power generation efficiency of wind power generation.

Or swivel mount 220 also contains semi-active yaw control for the following: excessive rotation is prevented and the cable is actively unwound, causing the turbine to move away from the wind direction.

By removing the yaw control system of the top hub, the rotating bedplate and the impellers are driven by the eccentric wind force to align with the wind direction, thereby increasing wind power production, reducing operating costs, and reducing wind load reaction forces of the bedplate.

According to the self-aligned rotatable wind turbine support system 200 provided in this embodiment, the principle of operation of the tower 100 is:

the tower 100 and support structure are not designed separately but rather the turbine, tower 100 and support are designed as a whole.

The tower section of the tower 100 is aerodynamically shaped to reduce wind loading and then simplified for ease of manufacture and installation, while being easily structurally optimized and lightweight. The tower section has the ability to wind drive the turbine wheel self-alignment due to its profile and tear drop cross section, as well as the rotatable base. The system uses the wind itself to align the impeller with the wind direction by combining the innovative tower 100 part design and rotatable base 220, thus it can greatly reduce the load on the support structure, a foundation with high gain ratio becomes a reality, and finally it can greatly reduce the flattening power cost.

The tower 100, as well as the self-aligning rotatable wind turbine support system 200, may be used for future large turbines, both offshore and onshore, floating or stationary. It can also be used to reuse existing offshore wind turbine mono-pile foundations and jacket foundations while increasing fan capacity.

The self-aligning rotatable wind turbine support system 200 provided by the present embodiment has at least the following advantages:

by designing the tower 100 tear drop cross-sectional configuration with aerodynamic shape, longitudinal loading is reduced, reducing infrastructure costs due to reduced loading.

The leveling power cost (LCOE) cost is reduced overall, including reducing loads, particularly loads of the support structure, and facilitating construction, reducing maintenance costs, and increasing power generation, thereby minimizing leveling power cost (LCOE).

Due to the design of the tower drum 100 of the aerodynamic tower, wind loads on the tower are reduced. By removing yaw control from the top rotor nacelle 210 assembly and the optimal tower 100 cross-section, the weight of the tower 100 is significantly reduced. Replacing the active yaw control of the rotor nacelle 210 assembly with the passive yaw control at the bottom eliminates the yaw forces applied at the dynamically most sensitive locations of the system, reduces the load of the tower from the top yaw action, and reduces the dynamic load at the hub. Dynamic response loads are reduced due to the rotatable base. Partial decoupling of the wind wave load due to the rotatable base 220 and passive yaw control reduces the mutual dynamic excitation effect from the wind wave combining process. Because the tower 100 is free to rotate, torsional loading of the tower 100 is eliminated or reduced. The non-axially symmetric tower 100 cross-sectional geometry allows the natural frequencies of the different modes of the tower to be separated more widely than a circular cross-section, thereby reducing any mutual dynamic excitation effects of the two modes. The significant difference in stiffness of the stronger and weaker axes of tower 100 results in lower dynamic sensitivity to coaxial excitation, where the two axes respond to the same applied resonant frequency, resulting in reduced loading of the foundation below rotating base 220.

The construction cost of the tower 100 is reduced. The cost of the rotor nacelle 210 assembly is not utilized because an active yaw control system is not utilized. The tower 100 is made in part from tear drop sections and in part from the contour of the Kammback-carbomer back, with a good tradeoff in terms of reduced wind load and manufacturability. For example, tower sections may use standard or thinner and smaller sheet tubing than other wind towers, thereby increasing availability of material supplies and thus reducing costs. The lower side of the swivel base 220 generates a foundation construction cost due to the reduced load. The total weight reduction and the reduction of load at the support structure interface not only provide an opportunity to reduce the basis weight, but also allow cheaper forms of foundation, such as mono-piles, to be used. The rigid connection between the tower and the Rotor Nacelle Assembly (RNA) thus reduces movable parts and reduces maintenance costs. By placing the passive yaw control at the bottom, maintenance cost is reduced, and operation can be quickly resumed when a fault occurs, so that power generation production efficiency is improved, and leveling electric power cost (LCOE) cost is reduced.

The rotational connection of the tower 100 to the swivel base 220 replaces the prior fixed and grouted or bolted connections. Construction cost can be saved, and the construction method is easy to disassemble in the retired stage.

Torque induced under wind loads of turbines has been a design challenge, particularly in designing jacket support structures. In this embodiment, the torsional loading of the turbine can be reduced to almost zero, because the tower 100 is configured with a rotating base 220 at the bottom so that the tower 100 with the nacelle 210 can rotate freely in the horizontal direction, subject only to passive constraints of passive yaw control.

The present invention is useful for new turbine support structures that can also be used to re-use existing onshore/offshore turbine support systems for newer and larger turbines because the loading of the same capacity turbine can be reduced.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a tower section of thick bamboo, its characterized in that, tower section of thick bamboo is the column, the cross section of thick bamboo includes by arc section (110), first connecting wire (120), carbomer back of the body line (130) and second connecting wire (140) end to end in proper order encloses the contour line that becomes, arc section (110) first connecting wire (120) and second connecting wire (140) enclose into tear drop molding or oval molding, the opening width size of arc section (110) is greater than the width of carbomer back of the body line (130).

2. A tower according to claim 1, wherein:

the cross section of the tower takes a connecting line extending from the center of the arc section (110) to the center of the carbomer back line (130) as a central symmetry axis.

3. A tower according to claim 2, wherein:

the first connecting line (120) and the second connecting line (140) are arc-shaped or straight.

4. A tower according to claim 2, wherein:

the arc section (110) is in a semicircular arc; the opening width of the arc line (110) is equal to the diameter of the arc line (110).

5. A tower according to any of claims 1-4, wherein:

at wind speeds of 5m/s to 50m/s, reynolds numbers are 1.125x10 ⁶ And 1.126x10 ⁷ In the range of L/D > 2.5, where L is the longest distance from the card back line (130) to the arc line (110) and D is the opening width of the arc line (110).

6. A tower according to claim 5, wherein:

at reynolds number re=10 ⁵ In the case of (3), L/D > 3.9.

7. A self-aligning rotatable wind turbine support system comprising a swivel base (220) and a tower according to any of claims 1-6; the tower is rotatably arranged on the rotary base (220).

8. A self-aligning rotatable wind turbine support system as claimed in claim 7 wherein:

the self-aligning rotatable wind turbine support system further includes a slewing member; the tower drum is matched with the rotating base (220) through the rotating member to form a yaw kinematic pair, the rotation center of the rotating member is coincident with the circle center corresponding to the arc line section (110), or the rotation center of the rotating member is deviated from the circle center corresponding to the arc line section (110), and the deviation distance is smaller than the circle radius corresponding to the arc line section (110).

9. A self-aligning rotatable wind turbine support system as claimed in claim 8 wherein:

the self-aligning rotatable wind turbine support system further comprises a nacelle (210); the nacelle (210) is fixedly connected with the tower.

10. A self-aligning rotatable wind turbine support system as claimed in claim 9 wherein:

the self-aligning rotatable wind turbine support system further comprises a passive yaw control system or a semi-active yaw control system; the passive yaw control system or the semi-active yaw control system is arranged in the rotating bedplate (220), and the passive yaw control system or the semi-active yaw control system is used for performing yaw control on the nacelle (210) and the tower.