CN210087551U - Wind turbine tower column imitating seal beard - Google Patents
Wind turbine tower column imitating seal beard Download PDFInfo
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- CN210087551U CN210087551U CN201920690045.4U CN201920690045U CN210087551U CN 210087551 U CN210087551 U CN 210087551U CN 201920690045 U CN201920690045 U CN 201920690045U CN 210087551 U CN210087551 U CN 210087551U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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Abstract
The utility model relates to a wind turbine tower column of imitative seal beard, the axis of wind turbine tower column is perpendicular to ground, be equipped with ellipse one and ellipse two that incline to the horizontal plane in the direction of height of wind turbine tower column in turn, the distance between the adjacent ellipse one and ellipse two central points is equal, the central point of wind turbine tower column half-height is ellipse one, each ellipse above wind turbine tower column half-height uses wind turbine tower column axis as the center anticlockwise rotation angle lambda in proper order for adjacent next ellipse; and each ellipse below the half-height of the wind turbine tower column rotates clockwise by an angle lambda relative to the adjacent previous ellipse by taking the axis of the wind turbine tower column as the center, and phase points corresponding to the adjacent first ellipse and the adjacent second ellipse are sequentially connected through a smooth cambered surface to form an appearance cambered surface of the wind turbine tower column. Each ellipse is rotated by an angle λ =2 ° to 5 °. The wind turbine tower column can reduce unsteady flow interference generated between the wake flow of the rotating blade and the tower column, reduce low-frequency aerodynamic noise and improve output power.
Description
Technical Field
The utility model relates to a wind energy conversion system pylon, in particular to wind energy conversion system pylon of imitative seal beard belongs to wind power generation equipment technical field.
Background
With the rapid development of the wind energy industry, the distance between a wind power plant and a residential area is closer and closer, the single-machine power of a wind turbine is continuously improved, the diameter of an impeller of the wind turbine is larger and larger, the diameter of a wind wheel exceeds 120m at present, and the next-generation 10MW wind turbine is also listed as a national key research and development plan. The problem of aerodynamic noise of wind turbines is increasingly prominent.
The aerodynamic noise of a wind turbine can be roughly divided into three categories: (1) broadband noise of incoming flow turbulence; (2) broadband noise generated by the action of the blade and airflow can be reduced by optimizing the airfoil profile or adding blade accessories such as a sawtooth tail edge, a vortex generator and the like; (3) the low frequency noise generated by the blade-tower interaction produces a significant unsteady flow interference phenomenon between the rotating blade wake and the stationary tower, the so-called tower shadow effect, which is an important source of low frequency aerodynamic noise for wind turbines. After the blade is enlarged, the problem of low-frequency interference noise becomes more and more prominent, and the low-frequency interference noise becomes one of important factors restricting the development of the wind turbine. In fact, this tower shadow phenomenon may be interference between the rotating blade and an arbitrary object, and since the rotating blade is periodically disturbed by an object in a short time, the generated noise is also periodic. Except for the field of wind power generation, the tower shadow interference noise exists in various rotating machines such as a helicopter propeller, a ship propeller, water jet propulsion and the like.
The frequency and amplitude of seal beard vortex-induced vibrations were analyzed and the conclusion showed that the whisker vibrations were significantly weaker in a uniform flow, which helped to improve the signal-to-noise sensitivity of seals in tracking hydraulic traces of prey. And numerical calculation simultaneously shows that under the condition of large-range Reynolds number, the average resistance and the pulsating resistance of the seal beards are respectively reduced by 40 percent and 90 percent, and the reduction amplitude of the pulsating lift force exceeds 94 percent. The continuously shedding vortex structures in the whisker wake appear further downstream and decay more rapidly than a smooth cylinder. The flow direction and longitudinal speed pulsation intensity is greatly reduced, the vortex shedding process is greatly inhibited, and the pulsating force on the cylindrical surface is reduced.
Therefore, the wind turbine tower column imitating the seal beard is provided based on bionics, and has very urgent theoretical research value and engineering application significance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that exists among the prior art, provide a wind turbine tower of imitative seal beard, can alleviate the unsteady flow interference that produces between rotating vane's wake and the wind turbine tower, reduce the aerodynamic noise of low frequency of wind turbine.
In order to solve the technical problem, the utility model discloses an imitative wind turbine pylon of seal beard, the axis of wind turbine pylon is perpendicular to ground, is equipped with ellipse one and ellipse two that incline to the horizontal plane in the direction of height of wind turbine pylon in turn, and the distance between the adjacent ellipse one and the ellipse two central point is equal, and the central point of wind turbine pylon half-height is ellipse one, and each ellipse above the wind turbine pylon half-height uses wind turbine pylon axis as the centre anticlockwise rotation angle lambda in proper order for adjacent next ellipse; and each ellipse below the half-height of the wind turbine tower column rotates clockwise by an angle lambda relative to the adjacent previous ellipse by taking the axis of the wind turbine tower column as the center, and phase points corresponding to the adjacent first ellipse and the adjacent second ellipse are sequentially connected through a smooth cambered surface to form an appearance cambered surface of the wind turbine tower column.
Compared with the prior art, the utility model discloses following beneficial effect has been obtained: the utility model discloses a structure and the seal of research analysis seal beard are excellent SNR sensitivity when tracking prey water conservancy vestige, carry out bionical modeling to the wind turbine tower from the geometry, through the good perception nature of seal beard model to the upstream disturbance, thereby mastered the work law of using seal beard as the wind turbine tower of prototype to a certain extent, under the low wind speed operating mode that is fit for the wind turbine operation, make the wind turbine receive very big suppression because the whirlpool process that causes of the interference of tower, especially when the wind turbine blade sweeps over the tower, reduce the interference that the wind turbine received the shadow effect of tower, can show improvement wind turbine aerodynamic performance, and reduce blade-tower interference noise. The tower column design of the utility model relates to simple process, convenient parametric design, and final numerical simulation results prove that under the same working condition, the wind turbine adopting the tower column of the utility model has larger output torque than the wind turbine adopting the traditional circular tower column, and the reduction of the output torque is small when being interfered by the tower shadow effect; the eddy quantity at the tower column is obviously reduced, and the noise caused by the blade-tower column interference is obviously smaller than that of a wind turbine adopting a traditional circular tower column, so that the blade-tower column interference noise at the same measuring point is reduced to different degrees. The utility model discloses wind turbine tower of imitative seal beard easily designs, and is feasible, has better engineering using value.
As the preferred scheme of the utility model, the length of the major axis of the ellipse I is 2a, the length of the minor axis is 2b, and the included angle between the major axis and the horizontal plane is theta 1; the length of the long axis of the ellipse II is 2A, the length of the short axis of the ellipse II is 2B, and the included angle between the ellipse II and the horizontal plane is theta 2; the angle theta 1 is 30-32 degrees, the angle theta 2 is 34-36 degrees, a = 1.38-1.42B, A = 1.2-1.22B, and A = 1-1.1 a. The wind direction of considering wind turbine actual operation is unstable, and this spiral wake that can make rotatory wind wheel takes place the incline, and then produces unsteady induced velocity in the wind wheel rotation plane for the wing section angle of attack constantly takes place undulantly on each cross-section of blade, the utility model discloses the pylon under the parameter includes a plurality of oval cross-sections that have certain inclination with the horizontal plane, can satisfy simultaneously and move under above-mentioned operating mode.
As the preferred scheme of the utility model, the distance D =5 ~ 5.2a between two central points of adjacent ellipse one and ellipse. The size of the D value determines the wavelength of the wave characteristic wall surface, the wave characteristic wall surface of the utility model enhances the momentum and energy exchange in the boundary layer to a certain extent, reduces the adverse pressure gradient and the low-energy airflow accumulation, and reduces the surface pressure pulsation of the tower column imitating the seal beard, thereby reducing the blade-tower column interference noise generated by the tower shadow effect; if the wavelength is too small, the curve change of the outer wall of the cylinder is too large, and if the wavelength is too large, the flow field around the wind turbine is influenced.
As a preferable embodiment of the present invention, each ellipse rotation angle λ =2 ° to 5 °. Each elliptical section rotates for a certain angle along with the central axis of the wind turbine tower column, so that the wind turbine can have certain drag reduction and vibration reduction effects under multiple yaw working conditions, the strength of the wind turbine tower column can be improved, and the application range of the wind turbine tower column can be enlarged.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.
Fig. 1 is a schematic structural view of a wind turbine tower column imitating seal beards of the utility model.
Fig. 2 is a simulation the utility model discloses little model is used in analysis of wind turbine tower of imitative seal beard.
Fig. 3 is an output torque comparison diagram of the wind turbine imitating the seal beard tower column and the wind turbine adopting the traditional circular tower column.
Fig. 4 is a visual comparison diagram of the surrounding flow field structure of the tower column of the present invention and the conventional circular tower column, which is based on the Q-Criterion standard.
Fig. 5 is a measuring point layout diagram of a wind turbine with the simulated seal beard tower column in the blade-tower column interference noise test.
Fig. 6 is a sound pressure contrast diagram of the blade-tower column interference noise at the measuring point 2 of the wind turbine adopting the seal beard-like tower column of the utility model and the wind turbine adopting the traditional circular tower column.
Fig. 7 is a comparison of the interference noise spectrum of the blade-tower of the wind turbine using the traditional circular tower and the simulated seal beard tower of the present invention at the measuring point 1.
Fig. 8 is a comparison of the interference noise spectrum of the blade-tower of the wind turbine using the traditional circular tower and the simulated seal beard tower of the present invention at the measuring point 2.
Fig. 9 is a comparison of the interference noise spectrum of the blade-tower of the wind turbine using the traditional circular tower and the simulated seal beard tower of the present invention at the measuring point 3.
Detailed Description
As shown in fig. 1, the axis of the wind turbine tower imitating seal beard of the utility model is perpendicular to the ground, a first ellipse and a second ellipse inclined to the horizontal plane are alternately arranged in the height direction of the wind turbine tower, the distance between the central points of the first ellipse and the second ellipse is equal, the central position of the half-height position of the wind turbine tower is the first ellipse, and each ellipse above the half-height position of the wind turbine tower is rotated counterclockwise by a rotation angle lambda in sequence by taking the axis of the wind turbine tower as the center relative to the next ellipse adjacent to the first ellipse; and each ellipse below the half-height of the wind turbine tower column rotates clockwise by an angle lambda relative to the adjacent previous ellipse by taking the axis of the wind turbine tower column as the center, and phase points corresponding to the adjacent first ellipse and the adjacent second ellipse are sequentially connected through a smooth cambered surface to form an appearance cambered surface of the wind turbine tower column.
The length of the long axis of the ellipse I is 2a, the length of the short axis of the ellipse I is 2b, and the included angle between the ellipse I and the horizontal plane is theta 1; the length of the long axis of the ellipse II is 2A, the length of the short axis of the ellipse II is 2B, and the included angle between the ellipse II and the horizontal plane is theta 2; the angle theta 1 is 30-32 degrees, the angle theta 2 is 34-36 degrees, a = 1.38-1.42B, A = 1.2-1.22B, and A = 1-1.1 a.
The distance D =5 ~ 5.2a between the center points of the adjacent ellipse I and ellipse II.
Each ellipse is rotated by an angle λ =2 ° to 5 °.
⑴ setting the total height of the wind turbine tower as H, the axis of the wind turbine tower is vertical to the ground;
⑵ designing a first ellipse section with the center position of the wind turbine tower column at half height as the center point, the length of the major axis of the ellipse being 2a, the length of the minor axis of the ellipse being 2b, the included angle with the horizontal plane being theta 1, defining the ellipse which is the same as the major axis and the minor axis of the first ellipse section and the included angle with the horizontal plane as ellipse I;
⑶ designing a second elliptical section right below the first elliptical section, the distance between the center point of the second elliptical section and the center point of the first elliptical section is D, the length of the major axis of the second elliptical section is 2A, the length of the minor axis of the second elliptical section is 2B, the included angle between the minor axis and the horizontal plane is theta 2, and the ellipse which is the same as the major axis and the minor axis of the second elliptical section and also has the same included angle with the horizontal plane is defined as ellipse II;
⑷ designing a third elliptical section right above the first elliptical section, wherein the distance between the center point of the third elliptical section and the center point of the first elliptical section is D, the third elliptical section is ellipse II, and the phase position of the third elliptical section is counterclockwise rotation angle lambda relative to the first elliptical section by taking the axis of the wind turbine tower as the center;
⑸ a fourth elliptical section is designed under the second elliptical section, the distance between the center point of the fourth elliptical section and the center point of the second elliptical section is D, the fourth elliptical section is ellipse I, and the phase of the fourth elliptical section is clockwise rotation angle lambda with the axis of the wind turbine tower as the center compared with the second elliptical section;
⑹ designing a fifth elliptical section right above the third elliptical section, wherein the distance between the center point of the fifth elliptical section and the center point of the third elliptical section is D, the fifth elliptical section is ellipse I, and the phase of the fifth elliptical section is counterclockwise rotation angle lambda relative to the third elliptical section by taking the axis of the wind turbine tower as the center;
⑺ a sixth elliptical section is designed under the fourth elliptical section, the distance between the center point of the sixth elliptical section and the center point of the fourth elliptical section is D, the sixth elliptical section adopts ellipse II, and the phase position of the sixth elliptical section is clockwise rotation angle lambda with the axis of the wind turbine tower column as the center compared with the fourth elliptical section;
⑻ a seventh elliptical section is designed right above the fifth elliptical section, the distance between the center point of the seventh elliptical section and the center point of the fifth elliptical section is D, the seventh elliptical section adopts ellipse II, and the phase of the seventh elliptical section is counterclockwise rotation angle lambda with the axis of the wind turbine tower as the center compared with the fifth elliptical section;
⑼ repeating the above steps until the height difference between the upper edge of the lowest elliptical section and the center point of the first elliptical section is greater than 0.5H, and the height difference between the lower edge of the uppermost elliptical section and the center point of the first elliptical section is also greater than 0.5H;
⑽ the phase points corresponding to each adjacent elliptical section are connected in turn by smooth arc surfaces to form the complete surface arc surface of the wind turbine tower;
⑾ the excessive part below the central point of the first ellipse section is cut off by the horizontal plane at 0.5H below the central point of the first ellipse section to obtain a horizontal bottom surface of the wind turbine tower, the excessive part above the central point of the first ellipse section is cut off by the horizontal plane at 0.5H above the central point of the first ellipse section to obtain a horizontal top surface of the wind turbine tower, and the horizontal top surface, the outer arc surface and the horizontal bottom surface enclose a complete wind turbine tower.
The angle theta 1 is 30-32 degrees, the angle theta 2 is 34-36 degrees, a = 1.38-1.42B, A = 1.2-1.22B, and A = 1-1.1 a. The distance D =5 ~ 5.2a between the center points of the adjacent ellipse I and ellipse II. Each ellipse is rotated by an angle λ =2 ° to 5 °.
Right the utility model discloses an imitative seal beard king pylon carries out pneumatic performance simulation with traditional circular pylon and compares, include: (1) under the same operating mode, adopt the utility model discloses the output torque contrast of the wind energy conversion system of pylon and the wind energy conversion system of adopting traditional circular pylon. (2) Under the same operating mode, the utility model discloses the flow field vorticity contrast around tower column and traditional circular tower column.
In order to facilitate the comparison and analysis by adopting simulation software, the wind turbine tower column imitating the seal beard of the utility model is reduced in the same proportion, the height H of the wind turbine tower column is 1.5m, the length 2a of the long axis of the first ellipse is 0.164m, the length 2b of the short axis is 0.118m, and the included angle theta 1 between the first ellipse and the horizontal plane is 30.54 degrees; the length 2A of the long axis of the second ellipse is 0.154m, the length 2B of the short axis of the second ellipse is 0.128m, and the included angle theta 2 between the second ellipse and the horizontal plane is 35.2 degrees; the distance D between the central points of the adjacent ellipses I and II is 0.42 m; the rotation angle lambda of the elliptic section along with the central axis of the tower column is 2 degrees. And determining the parameters, completing the modeling of the small model of the wind turbine tower simulating the seal beard, wherein the built small model is shown in figure 2.
Regard as the incoming flow direction with the projection of the major axis of first ellipse one on the horizontal plane, as the circular pylon of comparative example highly equal with the utility model discloses the simulation example highly equals, and the circular pylon of as the comparative example is equal at the ascending projection area of incoming flow direction the utility model discloses the simulation example is equal at the ascending projection area of incoming flow direction, promptly the circular pylon of comparative example with the utility model discloses the simulation example tests under the condition that windward area and height equal.
Numerical simulation research is carried out on a DTU-LN221 wing type three-blade wind turbine model with the blade radius of 0.75m by using Fluent simulation software, the change rule of a wind turbine blade-tower column flow field is analyzed in a large vortex simulation mode, an unsteady calculation strategy is selected, the rotating speed of the blade is 800r/min, the incoming flow speed is 8m/s, and the minimum distance h between the blade and the outer edge of the tower column is 0.12 m. When the three blades of the wind turbine rotate to form a positive herringbone shape, namely the azimuth angle of one blade at the position right above is defined as 0 degree. Fig. 3 is the output torque contrast of the wind turbine of the seal beard-like tower column and the wind turbine of the traditional circular tower column under the same working condition.
As can be known from the contrastive analysis of figure 3, because the interference of tower shadow effect, there is fluctuation in wind energy conversion system output torque along with phase change, especially is in vertical downward position at the blade of wind energy conversion system, when sheltering from the position of pylon promptly, instantaneous output torque is minimum, and the contrast is found the utility model discloses the wind energy conversion system pylon of imitative seal beard can obviously reduce the fluctuation of output torque, improves output.
FIG. 4 is a visual comparison of a flow field structure around a wind turbine blade-tower using the Q-Criterion standard. Specifically be under the same operating mode, the utility model discloses the flow field vorticity contrast around tower column and traditional circular tower column, wait the rotation value and all select 0.0001. Wherein, fig. 4(a) is the wind turbine flow field vortex structure of the traditional circular tower column, and fig. 4(b) is the wind turbine flow field vortex structure of the small model of the wind turbine tower column of the utility model. The graph shows that the blade tip vortexes generated by the traditional circular tower column wind turbine blades are very obvious, and the blade tip vortexes are carried downstream by the incoming flow. Meanwhile, a series of vortex flows exist in the wind turbine near the blade root part and the tower column part. And the utility model discloses the vorticity of wind energy conversion system pylon department reduces obviously, explains the utility model discloses the wind energy conversion system pylon has droing of suppression whirlpool, improves the ability of wind energy conversion system aerodynamic performance.
In order to test and adopt the utility model discloses the characteristic of the blade-column interference noise of the wind turbine of imitative seal beard king pylon and the wind turbine that adopts traditional circular pylon, after adopting the mode of big vortex simulation to analyze the flow field change law in Fluent emulation software, load FW-H acoustic model, respectively set up three measurement station along incoming flow wind speed direction apart from 1.5m of wind turbine pylon, wherein measurement station 1 is located the pylon dead ahead, measurement station 2 is located the pylon side direction, measurement station 3 is located the pylon dead behind, each measurement station is all 0.3m from ground, concrete test position is as shown in figure 5, the black point is each noise measurement station position in figure 5.
Fig. 6 is a sound pressure contrast of the blade-tower column interference noise at the measuring point 2 of the wind turbine adopting the seal beard-like tower column of the utility model and the wind turbine adopting the traditional circular tower column. Obviously, the wind turbine adopting the tower column of the utility model is obviously smaller than the wind turbine adopting the traditional circular tower column due to the sound wave disturbance generated by the blades and the tower column.
Fig. 7 to 9 show the spectrum comparison of interference noise between the wind turbine with the leopard beard-like tower and the conventional wind turbine with circular tower. From the noise spectrogram, the noise of the measuring points 1, 2 and 3 arranged in the flow field is reduced to different degrees.
In conclusion, it can be seen that the utility model discloses the wind energy conversion system of imitative seal beard king pylon not only can promote the output of wind energy conversion system under the same operating mode, can reduce moreover because the produced noise of blade-pylon interference.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.
Claims (4)
1. The utility model provides an axis perpendicular to ground, its characterized in that of wind turbine tower of imitative seal beard: the height direction of the wind turbine tower column is alternately provided with a first ellipse and a second ellipse which are inclined to the horizontal plane, the distance between the central points of the first ellipse and the second ellipse is equal, the central position of the half-height position of the wind turbine tower column is the first ellipse, and each ellipse above the half-height position of the wind turbine tower column rotates anticlockwise by a certain angle lambda relative to the next adjacent ellipse by taking the axis of the wind turbine tower column as the center; and each ellipse below the half-height of the wind turbine tower column rotates clockwise by an angle lambda relative to the adjacent previous ellipse by taking the axis of the wind turbine tower column as the center, and phase points corresponding to the adjacent first ellipse and the adjacent second ellipse are sequentially connected through a smooth cambered surface to form an appearance cambered surface of the wind turbine tower column.
2. The seal beard imitating wind turbine tower column according to claim 1, wherein: the length of the long axis of the ellipse I is 2a, the length of the short axis of the ellipse I is 2b, and the included angle between the ellipse I and the horizontal plane is theta 1; the length of the long axis of the ellipse II is 2A, the length of the short axis of the ellipse II is 2B, and the included angle between the ellipse II and the horizontal plane is theta 2; the angle theta 1 is 30-32 degrees, the angle theta 2 is 34-36 degrees, a = 1.38-1.42B, A = 1.2-1.22B, and A = 1-1.1 a.
3. The seal beard imitating wind turbine tower column according to claim 1, wherein: the distance D =5 ~ 5.2a between the center points of the adjacent ellipse I and ellipse II.
4. The seal beard imitating wind turbine tower column according to claim 1, wherein: each ellipse is rotated by an angle λ =2 ° to 5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920690045.4U CN210087551U (en) | 2019-05-15 | 2019-05-15 | Wind turbine tower column imitating seal beard |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920690045.4U CN210087551U (en) | 2019-05-15 | 2019-05-15 | Wind turbine tower column imitating seal beard |
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| CN210087551U true CN210087551U (en) | 2020-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989893A (en) * | 2019-05-15 | 2019-07-09 | 扬州大学 | A kind of the wind energy conversion system king-post and its design method of imitative sea dog beard |
-
2019
- 2019-05-15 CN CN201920690045.4U patent/CN210087551U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989893A (en) * | 2019-05-15 | 2019-07-09 | 扬州大学 | A kind of the wind energy conversion system king-post and its design method of imitative sea dog beard |
| CN109989893B (en) * | 2019-05-15 | 2023-05-19 | 扬州大学 | Wind turbine tower column imitating seal beard and design method thereof |
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