CN108953074B - A wind turbine blade vortex generator - Google Patents

Abstract

The invention discloses a wind power blade vortex generator, wherein a vortex generating part comprises a first vortex plate and a second vortex plate which are arranged in a splayed mirror image manner; the vortex generator further includes a flow guide portion disposed at a narrow end of the vortex generating portion. According to the wind power blade vortex generator provided by the invention, the flow guide part is arranged on the vortex generator to play a role in rectification, the flow in the air flow direction can be reduced, the pneumatic performance of the blade is improved, and meanwhile, the flow guide part is matched with the vortex generation part to further improve the pneumatic performance of the blade.

Description

A wind turbine blade vortex generator

technical field

The invention relates to the field of wind power generation equipment, in particular to a wind power blade vortex generator.

Background technique

With the prosperity and growth of the economy, the problem of global resource shortage has become more and more prominent. While saving non-renewable energy, people have increased the development and utilization of renewable energy. Among them, the utilization of wind energy has been widely studied and applied.

As an important device for utilizing wind energy, the amount of wind energy captured by wind turbine blades from the air will be directly related to the energy output of the wind turbine. At present, the main method to improve the aerodynamic performance of wind turbine blades is to add vortex generators on the blade surface. The size and installation position of the vortex generators have a great impact on the airflow flow on the blade surface, which is also directly related to the improvement of the blade aerodynamic performance. During the operation of the existing vortex generator, there are problems of low vortex strength and poor stability, and the effect of improving the aerodynamic performance is also limited.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a wind turbine blade vortex generator to improve the aerodynamic performance of the wind turbine blade.

Based on the above purpose, the present invention provides a vortex generator for wind turbine blades, the vortex generator includes a vortex generating part, and the vortex generating part includes a first vortex plate and a second vortex plate arranged in a "character" mirror image; the The vortex generator further includes a flow guide portion disposed at the narrow end of the vortex generating portion.

Preferably, the guide portion includes a first guide plate and a second guide plate, the first guide plate is in contact with the first vortex plate, the second guide plate is in contact with the second vortex plate, and the first guide plate is in contact with the second vortex plate. The flow plate is parallel to the axis of symmetry of the vortex generating portion or has an included angle of less than or equal to 5 degrees, and the second deflector is parallel to the axis of symmetry of the vortex generating portion or has an included angle of less than or equal to 5 degrees.

Preferably, the first angle formed by the first vortex plate and the axis of symmetry is equal to the second angle formed by the second vortex plate and the axis of symmetry, and is between 10 and 50 degrees, optionally, between 10 and 30 degrees between.

Preferably, the ratio of the height of the vortex generating portion to the chord length of the blade section at the installation location is between 0.4% and 4%.

Preferably, the ratio of the height of the guide portion to the height of the vortex generating portion is between 0.1-0.3 or between 0.5-0.8.

Preferably, the edge of the eddy current generating portion is provided with a front side arc, a connecting arc and a rear side arc, and the upper edge of the guide portion is arc-shaped, which forms a continuous arc with the front side arc.

Preferably, the flow guiding part and the vortex generating part are integrally formed.

Preferably, the vortex generator further includes a base plate, the flow guiding part and the vortex generating part are fixed on the base plate, and the base plate is installed on the wind turbine blade.

The invention also provides a wind power blade, which includes a suction surface, a pressure surface, a leading edge and a trailing edge, and any of the above wind power blade vortex generators are arranged on the suction surface.

Preferably, the ratio of the length of the vortex generator from the leading edge of the blade section in the chordwise direction to the chord length of the blade section is between 25% and 50%.

It can be seen from the above that the wind turbine blade vortex generator provided by the present invention can reduce the spanwise flow of the airflow and improve the aerodynamic performance of the blade by setting the guide part on the vortex generator to play a rectifying role. The flow part and the vortex generation part cooperate to further improve the aerodynamic performance of the blade.

The present invention provides a wind turbine blade vortex generator, the height of the guide part and the vortex generation part is designed according to the chord length of the blade section at the installation place, the size of the vortex generator is precisely matched with each installation position on the blade, and each position is effective Improve aerodynamic performance, thereby improving blade power generation efficiency.

In the wind power blade provided by the invention, the ratio of the position of the vortex generator on the suction surface from the leading edge of the blade section in the chord direction to the chord length of the blade section is a set range, which can effectively improve the aerodynamic performance of the blade.

Description of drawings

1 is a schematic structural diagram of a wind turbine blade according to an embodiment of the present invention;

2 is a schematic structural diagram of a wind turbine blade vortex generator provided by an embodiment of the present invention;

3 is a schematic top view of a vortex generator provided by an embodiment of the present invention;

4 is a schematic cross-sectional view of a wind turbine blade provided by an embodiment of the present invention;

5 is a schematic diagram of a rear view of a vortex generator provided by an embodiment of the present invention;

FIG. 6 is a schematic side view of a vortex generator provided by an embodiment of the present invention.

Among them, 1- suction surface, 2- pressure surface, 3- blade root, 4- blade tip, 5- leading edge, 6- trailing edge, 7- vortex generator, 8- guide part, 9- vortex generation part, 10- Base plate, 11- Blade section chord length, 12- Thickness, 13- Diversion part height, 14- Eddy current generating part height, 15- Front side arc, 16- Connecting arc, 17- Back side arc, 18 - Symmetry axis, 19 - first angle, 20 - second angle, 21 - length.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities with the same name but not the same or non-identical parameters. It can be seen that "first" and "second" It is only for the convenience of expression and should not be construed as a limitation to the embodiments of the present invention, and subsequent embodiments will not describe them one by one.

As shown in FIG. 1 , a wind turbine blade structure is provided in an embodiment of the present invention. The wind turbine blade includes a suction surface 1 , a pressure surface 2 , a leading edge 5 and a trailing edge 6 , and a vortex generator 7 is arranged on the suction surface 1 of the wind turbine blade. . Optionally, a plurality of vortex generators 7 are sequentially arranged along the direction from the blade root 3 to the blade tip 4 .

FIG. 2 and FIG. 3 show the structure of the wind turbine blade vortex generator 7 provided in the embodiment of the present invention. The vortex generator 7 includes a vortex generating portion 9, and the vortex generating portion 9 includes a first vortex plate and a second vortex plate that are mirrored in a "figure-eight"; The part 8, which is used to reduce the spanwise flow of the gas, plays the role of guide and rectification. The flow guide part 8 cooperates with the vortex generation part 9 to play the role of guide flow and increase the vortex flow, and improve the aerodynamic performance of the blade.

Further, the guide part 8 includes a first guide plate and a second guide plate, the first guide plate is in contact with the first vortex plate, the second guide plate is in contact with the second vortex plate, and the first guide plate is in contact with the second vortex plate. The plate is parallel to the axis of symmetry 18 of the vortex generating portion 9 or has an included angle of less than or equal to 5 degrees, and the second deflector is parallel to the axis of symmetry 18 of the vortex generating portion 9 or has an included angle of less than or equal to 5 degrees. At this time, the first deflector and the second deflector are approximately parallel, and when the wind passes by, the impact of the airflow entering the deflector on the first deflector and the second deflector is small; The flow part and the vortex generating part form an obtuse angle, and the airflow that does not enter the guide part encounters the first vortex plate and the second vortex plate with little resistance. Therefore, the eddy current generator can rectify and improve the eddy current while reducing the damage caused by external factors under extreme working conditions.

In some embodiments of the present invention, the guide portion 8 and the vortex portion 9 are integrally formed, specifically, the first guide plate and the first vortex plate are integrally formed, and the second guide plate and the second vortex plate are integrally formed.

It can be clearly seen from FIG. 3 that the angle of the vortex generator provided by the embodiment of the present invention is provided. Specifically, the first vortex plate and the second vortex plate of the vortex generating portion 9 are distributed on both sides of the symmetry axis 18 in the shape of an “eight”. , the first angle 19 formed by the first vortex plate and the axis of symmetry 18 is equal to the second angle 20 formed by the second vortex plate and the axis of symmetry 18, and is between 10 and 50 degrees, optionally, between 10 and 30 degrees between degrees. The setting of this angle is beneficial to the generation of eddy currents.

As shown in FIG. 4 , a schematic cross-sectional view of a wind turbine blade provided for an embodiment of the invention. The blade section chord 11 is the distance between the leading edge 5 and the trailing edge 6 . In some embodiments of the invention, the wind turbine blade is a blunt trailing edge airfoil.

In some embodiments of the present invention, as shown in FIGS. 4 and 5 , the ratio of the height 14 of the vortex generating portion to the chord length 11 of the blade section where it is installed is between 0.4% and 4%. From the blade root to the blade tip, the chord length of the wind turbine blade is constantly changing, and the height 14 of the vortex generating portion 9 is precisely set according to the chord length of the installation site, so as to improve the vortex strength. In addition, in the follow-up maintenance process, the eddy current generator 7 is inspected and replaced in a targeted manner, so as to improve the maintenance efficiency.

In some embodiments of the present invention, the ratio of the height 13 of the guide portion to the height 14 of the vortex generating portion is between 0.1-0.3 or between 0.5-0.8, which is beneficial for the guide portion 8 to bear less wind resistance to achieve guide rectification At the same time, it cooperates with the vortex generating part 9 to achieve a better vortex strength, bears a small wind resistance to prevent the airflow from flowing in the spanwise direction, and reduces the lift loss caused thereby.

In some embodiments of the present invention, as shown in FIG. 6 , it can be seen from the side view of the vortex generator 7 that the edge of the vortex generating portion 9 is provided with a front arc 15 , a connecting arc 16 and a rear arc 17 . Optionally, the upper edge of the guide portion 8 is arc-shaped, which forms a continuous arc with the front arc 15 . Specifically, the front arc 15 of the first vortex plate extends to the edge of the first deflector, and the front arc 15 of the second vortex plate extends to the edge of the second deflector. Such a circular arc design further ensures the strength of the vortex generator 7 and at the same time contributes to the improvement of aerodynamic performance.

In some embodiments of the present invention, the thicknesses 12 of the diversion portion 8 and the eddy current generating portion 9 are equal. Such an arrangement can effectively improve the working reliability of the vortex generator 7 and reduce the damage caused by external factors under extreme working conditions. damage destruction.

In some embodiments of the present invention, the vortex generator 7 further includes a base plate 10 , and the flow guiding part 8 and the vortex generating part 9 are fixed on the base plate 10 . When installing, the base 10 is used as the installation unit, and there is no need to adjust the positions of the guide part 8 and the eddy current generating part 9, which is easy to install. Optionally, in some embodiments of the present invention, the flow guiding part 8 , the eddy current generating part 9 and the base plate 10 are integrally formed.

In some embodiments of the present invention, the material of the vortex generator is polymer to ensure the lightning protection performance of the blade.

The present invention also provides a wind power blade, comprising a suction surface 1 , a pressure surface 2 , a leading edge 5 and a trailing edge 6 , and any one of the above vortex generators 7 is arranged on the suction surface 1 . Specifically, the guide portion 8 of the vortex generator 7 faces the leading edge 5 , and correspondingly, the vortex generating portion 9 faces the trailing edge 6 .

In some embodiments of the present invention, the ratio of the length 21 of the vortex generator 7 from the leading edge 5 of the blade section in the chordwise direction to the chord length 11 of the blade section is between 25% and 50% (as shown in FIG. 4 ), there are It is beneficial to improve the lift-to-drag ratio of the blade, thereby improving the aerodynamic performance of the wind turbine blade.

Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the spirit of the present invention, the above embodiments or There may also be combinations between technical features in different embodiments, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Embodiments of the present invention are intended to cover all such alternatives, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. a wind turbine blade vortex generator, it is characterized in that, described vortex generator (7) comprises vortex generation part (9), and described vortex generation part (9) comprises the first vortex plate that is set into " character of eight " mirror image and a second vortex plate; the vortex generator (7) further comprises a guide part (8) arranged at the narrow end of the vortex generating part (9), the guide part (8) comprising a first guide plate and The second deflector, the first deflector is in contact with the first vortex plate, the second deflector is in contact with the second vortex plate, and both the first deflector and the second deflector are in contact with the vortex generating part (9 ) is parallel to the axis of symmetry (18); The ratio of the height of the guide portion (13) to the height of the vortex generating portion (14) is between 0.5 and 0.8. 2. The wind turbine blade vortex generator according to claim 1, wherein the first angle (19) formed by the first vortex plate and the axis of symmetry (18) is equal to that formed by the second vortex plate and the axis of symmetry (18). The second included angle (20) is between 10 and 50 degrees, and optionally, between 10 and 30 degrees. 3. The wind turbine blade vortex generator according to claim 1, characterized in that the ratio of the height (14) of the vortex generating part to the chord length (11) of the blade section at the installation place is between 0.4% and 4%. 4. The wind turbine blade vortex generator according to claim 1, wherein the edge of the vortex generating part (9) is provided with a front arc (15), a connecting arc (16) and a rear arc (17) ), the upper edge of the guide portion (8) is arc-shaped, which forms a continuous arc with the front arc (15). 5. The wind turbine blade vortex generator according to claim 1, characterized in that the flow guiding part (8) and the vortex generating part (9) are integrally formed. 6. The wind turbine blade vortex generator according to claim 1, wherein the vortex generator (7) further comprises a base plate (10), the flow guiding part (8) and the vortex generating part (9) ) is fixed on the base plate (10), and the base plate (10) is mounted on the wind turbine blade. 7. A wind turbine blade, comprising a suction surface (1), a pressure surface (2), a leading edge (5) and a trailing edge (6), wherein the suction surface (1) is provided with claims 1-6 Any one of the wind turbine blade vortex generators. 8 . The wind power blade according to claim 7 , wherein the ratio of the length ( 21 ) of the vortex generator ( 7 ) from the leading edge ( 5 ) of the blade section in the chord direction to the chord length ( 11 ) of the blade section Between 25%-50%.

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