CN207064139U - Wind generator set blade - Google Patents

Abstract

The utility model provides a blade for a wind turbine generator set. The blade for a wind turbine generator set includes: a blade root; a blade tip; and a blade body, wherein the blade body is located between the blade root and the blade tip, and the blade body includes a leading edge of the blade body and a trailing edge of the blade body; wherein a tip winglet is formed at the blade tip, and the tip winglet includes a leading edge of the tip winglet and a trailing edge of the tip winglet, and the tip winglet is bent toward the leading edge of the blade body or the trailing edge of the blade body, and the camber angle of the tip winglet is zero. The blade for a wind turbine generator set according to the utility model can reduce blade noise, and has the characteristics of simple structure and light weight. The blade for a wind turbine generator set can increase blade lift, reduce blade resistance, and improve wind energy utilization coefficient.

Description

wind turbine blades

technical field

The utility model relates to the technical field of wind power generation, in particular to a blade of a wind power generating set.

Background technique

The blade of a wind turbine is a key component used to capture wind energy in a modern wind turbine. When the blade of a wind turbine is running, the pressure on the pressure side is higher than the suction side. Under the action of the pressure difference, the airflow on the pressure side bypasses the tip of the blade. Flow to the suction side, so that the streamline on the pressure side is inclined from the blade root to the blade tip, while the streamline on the suction side is biased from the blade tip to the blade root. Since the airflow on the pressure surface and the suction surface have different flow directions at the trailing edge, a tip vortex is formed at the blade tip, which leads to blade tip noise and reduces the overall aerodynamic efficiency of the wind turbine.

Referring to the winglets commonly used in civil aircraft, the blade design with tiplets can reduce blade tip noise and improve the overall aerodynamic efficiency of wind turbines. However, the current existing blade tiplets are usually set up as upturned tiplets tilted toward the pressure surface or suction surface, and the sweep angle, camber angle and twist angle of the blade tiplets are at the same time at the blade tip The transition section of the winglet changes continuously, and the weight of the tip winglet set in this way is relatively large and the effect of reducing drag is limited. In addition, such upturned tip winglets require stiffeners, resulting in a complex structure and increased weight.

Utility model content

In order to solve the problems of the energy loss caused by the blade tip vortex, the noise generated by the trailing edge, and the complicated structure and weight increase of the existing upturned blade tiplet, according to one aspect of the utility model, a blade tiplet blade is provided. Wind turbine blades in which the tiplets are curved towards the leading or trailing edge of the blade body.

According to one aspect of the present utility model, there is provided a blade of a wind power generating set, the blade of a wind power generating set includes: a blade root; a blade tip; and a blade body, the blade body is located between the blade root and the blade tip , the blade body includes a blade body leading edge and a blade trailing edge; wherein, a tiplet is formed at the blade tip, and the blade tiplet includes a tiplet leading edge and a tiplet trailing edge , the tiplet is bent toward the leading edge of the blade body or the trailing edge of the blade, and the camber angle of the tiplet is zero.

According to an exemplary embodiment of the present utility model, the leading edge of the tiplet and the trailing edge of the tiplet may respectively include n segments, and the segments are straight line segments or curved segments, wherein n is greater than or A natural number equal to 1.

According to an exemplary embodiment of the present invention, the leading edge of the tiplet may sequentially include a first straight line segment at the leading edge and a second straight line segment at the leading edge along the spanwise direction of the blade, and the trailing edge of the tiplet may extend along the The spanwise direction of the blade sequentially includes the first straight line segment of the trailing edge and the second straight line segment of the trailing edge, and satisfies the following conditional formula:

5°≤∣α1∣<80°,

0°＜∣α2∣≤75°,

5°≤∣β1∣<75°,

0°<∣β2∣≤70°,

∣α1+α2∣≤80°,

∣β1+β2∣≤75°,

Wherein, α1 represents the angle formed by the first straight line segment of the leading edge and the reference line extending along the length direction of the blade airfoil leading edge, and α2 represents the angle between the second straight line segment of the leading edge and the The included angle formed by the reference line extending along the span direction of the first straight segment of the leading edge, and β1 represents the first straight segment of the trailing edge and the reference line of the trailing edge of the blade extending along the length direction of the blade body The formed included angle, β2, represents the included angle formed by the second straight line segment of the trailing edge and a reference line extending along the blade span direction of the first straight line segment of the trailing edge.

According to another exemplary embodiment of the present invention, the leading edge of the tiplet may include a leading straight line, and the trailing edge of the tiplet may include a trailing straight line, and satisfy the following conditional formula:

5°≤∣α3∣≤80°,

5°≤∣β3∣≤75°,

Wherein, α3 represents the angle formed by the straight line of the leading edge and the reference line extending along the length direction of the blade airfoil leading edge, and β3 represents the angle between the straight line of the trailing edge and the trailing edge of the blade airfoil along the The included angle formed by the reference lines extending along the length direction of the blade body.

According to yet another exemplary embodiment of the present invention, the leading edge of the tiplet may include a continuous curve at the leading edge, and the trailing edge of the tiplet may include a continuous curve at the trailing edge, and satisfy the following condition :

0°≤∣α4∣≤90°,

0°≤∣β4∣<90°,

Wherein, α4 represents the angle formed by the tangent of the continuous curve of the leading edge and the reference line extending along the length direction of the airfoil of the leading edge of the airfoil, and β4 represents the tangent of the continuous curve of the trailing edge and the The included angle formed by the reference line extending along the length direction of the blade body at the trailing edge of the blade, and α4 and β4 change continuously along the spanwise direction of the blade.

Preferably, between the first straight line segment of the leading edge and the leading edge of the blade body, between the first straight line segment of the trailing edge and the trailing edge of the blade, between the second straight line segment of the leading edge and the front edge There may be a continuous smooth transition between the first straight line segments of the edge and between the second straight line segment of the trailing edge and the first straight line segment of the trailing edge.

Preferably, there may be a continuous smooth transition between the straight line of the leading edge and the leading edge of the airfoil and between the straight line of the trailing edge and the trailing edge of the blade.

Preferably, there may be a continuous smooth transition between the continuous curve of the leading edge and the leading edge of the airfoil and between the continuous curve of the trailing edge and the trailing edge of the blade.

Preferably, the transition between the tiplet and the airfoil may be continuous and smooth.

Preferably, the airfoil section of the tiplet may correspond to the section of the blade airfoil.

The blade of the wind power generating set according to the utility model can reduce blade noise, and has a simple structure and light weight. The blades of the wind power generating set can increase the lift force of the blades, reduce the resistance of the blades and increase the utilization coefficient of wind energy.

Description of drawings

Exemplary embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings, and the above and other characteristics and advantages of the present utility model will become clearer. In the accompanying drawings:

Fig. 1 is a perspective view of a wind turbine blade according to an exemplary embodiment of the present invention;

Fig. 2 is a top view of a wind turbine blade according to an exemplary embodiment of the present invention;

Fig. 3 is a schematic diagram of a tiplet of a wind turbine blade according to an exemplary embodiment of the present invention;

Fig. 4 is a schematic diagram of a tiplet of a wind turbine blade according to another exemplary embodiment of the present invention;

Fig. 5 is a schematic diagram of a tiplet of a wind turbine blade according to yet another exemplary embodiment of the present invention.

Detailed ways

Embodiments of the invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

The wind turbine blade and its tiplets according to an exemplary embodiment of the present utility model will be described below with reference to FIGS. 1 to 5 .

Fig. 1 is a perspective view of a blade of a wind power generating set according to an exemplary embodiment of the present invention; Fig. 2 is a top view of a blade of a wind power generating set according to an exemplary embodiment of the present invention.

As shown in Figures 1 and 2, a wind turbine blade 10 according to an exemplary embodiment of the present invention includes a blade root 11, a blade body 16, and a blade tip 12, wherein the blade root 11 is used to install the blade on the hub , the blade body 16 extends from the blade root 11 toward the blade tip 12 , and the blade tip 12 is located at an end opposite to the blade root 11 relative to the blade body 16 . Here, as shown in FIG. 2 , the airfoil 16 extends vertically downward for a certain length, therefore, the vertically downward direction in FIG. 2 is the length direction of the airfoil 16 . The airfoil 16 may have an airfoil leading edge 13 and an airfoil trailing edge 14 with a pressure side 15 and a suction side (not shown) extending between the leading edge 13 and the trailing edge 14 . Airfoil 16 typically has an aerodynamic airfoil such that blade 10 harvests wind energy using known aerodynamic principles.

Wherein, a tiplet 20 may also be formed at the tip 12 , and the tiplet 20 may be located at the end of the tip 12 along the spanwise direction of the blade. Here, the spanwise direction of the blade refers to the extending direction of the blade 10 from the blade body 16 toward the blade tip 12 . In some embodiments, the tiplet 20 may be a separate component from the airfoil 16 and mounted on the airfoil 16 . In other embodiments, the tiplet 20 and the blade airfoil 16 can be integrally formed to form an integral structure.

Preferably, the transition between the tiplet 20 and the airfoil 16 can be continuous and smooth.

Furthermore, it should be understood that the airfoil cross-section of the tiplet 20 may correspond to the cross-section of the airfoil 16 .

According to an exemplary embodiment of the present invention, the tiplet 20 may include a tiplet leading edge 23 and a tiplet trailing edge 24, and the tiplet 20 may face toward the leading edge 13 or the trailing edge of the blade body. 14 bends.

According to an exemplary embodiment of the present invention, the tiplet 20 may define a sweep angle, and the camber angle of the tiplet 20 may be zero, such that the tiplet 20 is tapered. The sweep angle represents the degree of bending of the tiplet 20 towards the leading edge 13 or the trailing edge 14 of the blade body, and the camber angle represents the degree of bending of the tiplet 20 towards the pressure surface or the suction surface. In this exemplary embodiment, the tiplet 20 is bent only towards the airfoil leading edge 13 or the blade trailing edge 14 , but not towards the pressure side or the suction side.

The tiplet 20 according to the exemplary embodiment of the present invention may satisfy the following conditional formula:

0°≤∣α∣≤90°,

0°≤∣β∣<90°,

Wherein, α denotes the sweep angle of the tiplet 20 at the leading edge 23 of the tiplet, and β denotes the sweep angle of the tiplet 20 at the trailing edge 24 of the tiplet. More specifically, the sweep angle α is formed by the reference line extending along the length direction of the airfoil 16 (as shown in FIG. 2 , vertically downward) between the blade tip winglet leading edge 23 and the blade airfoil leading edge 13 The included angle, β, represents the included angle formed by the blade tip winglet trailing edge 24 and the blade trailing edge 14 along the length direction of the blade body 16 (as shown in FIG. 2 , the vertical downward direction). In this specification, α and β Positive values at the same time; when the tiplet 20 bends toward the trailing edge 14 (that is, the leading edge 23 of the tiplet and the trailing edge 24 of the tiplet both bend toward the trailing edge 14), α and β are both negative value.

According to an exemplary embodiment of the present invention, the tiplet leading edge 23 and the tiplet trailing edge 24 of the tiplet 20 may include n segments respectively, and the segments are straight line segments or curved segments, wherein, n is a natural number greater than or equal to 1. That is, the tiplet leading edge 23 may include n straight segments connected to each other or n curved segments connected to each other, or may include both straight segments and curved segments. Likewise, the tiplet trailing edge 24 may also include n straight line segments connected to each other or n curved line segments connected to each other, or may include both straight line segments and curved line segments.

A specific example of the tiplet 20 will be described in detail below with reference to FIGS. 3 to 5 .

Fig. 3 is a schematic diagram of a tiplet 20 of a wind turbine blade 10 according to an exemplary embodiment of the present invention.

Referring to FIG. 3 , the tiplet leading edge 23 and the tiplet trailing edge 24 may respectively include two straight line segments. Specifically, the tiplet leading edge 23 may sequentially include a leading edge first straight segment 23a and a leading edge second straight segment 23b along the spanwise direction of the blade, and the tiplet trailing edge 24 may sequentially include a trailing edge segment along the blade spanwise direction. The first straight line segment 24a of the trailing edge and the second straight line segment 24b of the trailing edge, and the tiplet 20 can satisfy the following conditional formula:

5°≤∣α1∣<80°,

0°＜∣α2∣≤75°,

5°≤∣β1∣<75°,

0°<∣β2∣≤70°,

∣α1+α2∣≤80°,

∣β1+β2∣≤75°,

Wherein, α1 represents the angle formed by the first straight line segment 23a of the leading edge and the reference line extending along the length direction of the airfoil 16 of the leading edge 13 of the blade airfoil, and α2 represents the second straight line segment 23b of the leading edge and the first straight line segment of the leading edge 23a is the angle formed by the reference line extending along the span direction of the blade, and β1 represents the angle formed by the first straight line segment 24a of the trailing edge and the reference line extending along the length direction of the blade body 16 of the blade trailing edge 14, and β2 represents the rear The angle formed by the second straight line segment 24b at the edge and the reference line extending along the blade span direction of the first straight line segment 24a at the trailing edge.

In one example, the tiplet 20 may be preferably configured to satisfy the following conditional formula:

30°≤∣α1∣≤50°,

30°≤∣α2∣≤50°,

10°≤∣β1∣≤30°,

10°≤∣β2∣≤30°,

∣α1+α2∣≤80°,

∣β1+β2∣≤75°.

Preferably, between the first straight segment 23a of the leading edge and the leading edge 13 of the blade body, between the first straight segment 24a of the trailing edge and the trailing edge 14 of the blade, between the second straight segment 23b of the leading edge and the first straight segment 23a of the leading edge There can be a continuous and smooth transition between the second straight line segment 24b at the trailing edge and the first straight line segment 24a at the trailing edge.

Fig. 4 is a schematic diagram of a tiplet 20 of a wind turbine blade 10 according to another exemplary embodiment of the present invention.

Referring to FIG. 4 , both the tiplet leading edge 23 and the tiplet trailing edge 24 may include a straight line. Specifically, the tiplet leading edge 23 may include a leading edge straight line 23c, the tiplet trailing edge 24 may include a trailing edge straight line 24c, and the tiplet 20 may satisfy the following conditional formula:

5°≤∣α3∣≤80°,

5°≤∣β3∣≤75°,

Wherein, α3 represents the angle formed by the leading edge straight line 23c and the reference line extending along the length direction of the blade airfoil 16 of the leading edge 13 of the blade airfoil, and β3 represents the angle formed by the trailing edge straight line 24c and the blade airfoil trailing edge 14 along the length direction of the blade airfoil 16 The angle formed by the extended reference lines.

In one example, the tiplet 20 may be preferably configured to satisfy the following conditional formula:

30°≤∣α3∣≤60°,

10°≤∣β3∣≤50°.

Preferably, both the straight line 23c of the leading edge and the leading edge 13 of the airfoil, and the straight line 24c of the trailing edge and the trailing edge 14 of the blade can have continuous and smooth transitions.

Fig. 5 is a schematic diagram of a tiplet 20 of a wind turbine blade 10 according to yet another exemplary embodiment of the present invention.

Referring to FIG. 5 , both the tiplet leading edge 23 and the tiplet trailing edge 24 may comprise a continuous curve. Specifically, the tiplet leading edge 23 may include a leading edge continuous curve 23d, the tiplet trailing edge 24 may include a trailing edge continuous curve 24d, and the tiplet 20 may satisfy the following conditional formula:

0°≤∣α4∣≤90°,

0°≤∣β4∣<90°,

Wherein, α4 represents the angle formed by the tangent of the continuous curve 23d at the leading edge and the reference line extending along the length direction of the airfoil 16 at the leading edge 13 of the airfoil, and β4 represents the angle between the tangent of the continuous curve 24d at the trailing edge and the trailing edge 14 of the blade airfoil. The included angle formed by the reference line extending along the length direction of the blade body 16, and α4 and β4 change continuously along the spanwise direction of the blade.

Preferably, there can be a continuous smooth transition between the leading edge continuous curve 23d and the leading edge 13 of the blade body, and between the trailing edge continuous curve 24d and the blade trailing edge 14 .

The wind turbine blade according to the utility model can reduce the noise of the blade, and its structure is simple and light in weight because its tiplet is only bent toward the leading edge or the trailing edge of the blade body. In addition, according to the utility model, the blade of the wind power generating set with the blade tip winglet can increase the lift force of the blade, reduce the resistance of the blade and improve the utilization coefficient of wind energy.

Although the utility model has been specifically shown and described with reference to the exemplary embodiments of the utility model, those skilled in the art should understand that, without departing from the spirit and scope of the utility model defined by the claims, the utility model can be Various changes in form and detail are made to it.

Claims (10)

1. a kind of wind generator set blade (10), the wind generator set blade (10) includes：

Blade root (11)；

Blade tip (12)；And

Blade (16), between the blade root (11) and the blade tip (12), the blade (16) includes the blade (16) Blade leading edge (13) and blade trailing edge (14),

Characterized in that, at the blade tip (12) place formed with tip vane (20), it is small that the tip vane (20) includes blade tip Nose of wing (23) and tip vane trailing edge (24), the tip vane (20) is towards the blade leading edge (13) or the blade Trailing edge (14) is bent, and the camber angle of the tip vane (20) is zero.

2. wind generator set blade (10) according to claim 1, it is characterised in that the tip vane leading edge (23) Include n section respectively with the tip vane trailing edge (24), described section is straightway or curved section, wherein, n be more than or equal to 1 natural number.

3. wind generator set blade (10) according to claim 1 or 2, it is characterised in that the tip vane leading edge (23) opened up along blade to sequentially including leading edge first straight line section (23a) and leading edge second straight line section (23b), the tip vane Trailing edge (24) is opened up to sequentially including trailing edge first straight line section (24a) and trailing edge second straight line section (24b) along blade, and is met Following conditionals：

5 80 ° of 1 ∣ ＜ of ° ≤ ∣ α,

0 ° of ∣≤75 ° of ＜ ∣ α 2,

5 75 ° of 1 ∣ ＜ of ° ≤ ∣ β,

0 ° of ∣≤70 ° of ＜ ∣ β 2,

∣≤80 ° of ∣ α 1+ α 2,

∣≤75 ° of ∣ β 1+ β 2,

Wherein, α 1 represents the length along the blade (16) of the leading edge first straight line section (23a) and the blade leading edge (13) The angle that the reference line of direction extension is formed is spent, α 2 represents the leading edge second straight line section (23b) and the leading edge first straight line The angle that the reference line formation to extension is opened up along blade of section (23a), and β 1 represents the trailing edge first straight line section (24a) and institute The angle that the reference line of the length direction extension along the blade (16) of blade trailing edge (14) is formed is stated, β 2 represents the trailing edge Second straight line section (24b) and the angle that the reference line formation to extension is opened up along blade of the trailing edge first straight line section (24a).

4. wind generator set blade (10) according to claim 1 or 2, it is characterised in that the tip vane leading edge (23) a leading edge straight line (23c) is included, the tip vane trailing edge (24) includes a trailing edge straight line (24c), and meets Following conditionals：

∣≤80 ° of 5 ° ≤ ∣ α 3,

∣≤75 ° of 5 ° ≤ ∣ β 3,

Wherein, α 3 represents the length direction along the blade (16) of the leading edge straight line (23c) and the blade leading edge (13) The angle that the reference line of extension is formed, β 3 represent the trailing edge straight line (24c) and the blade trailing edge (14) along the blade (16) angle that the reference line of length direction extension is formed.

5. wind generator set blade (10) according to claim 1 or 2, it is characterised in that the tip vane leading edge (23) a leading edge full curve (23d) is included, the tip vane trailing edge (24) includes a trailing edge full curve (24d), And meet following conditionals：

∣≤90 ° of 0 ° ≤ ∣ α 4,

0 90 ° of 4 ∣ ＜ of ° ≤ ∣ β,

Wherein, α 4 represents the tangent line of the leading edge full curve (23d) and the blade leading edge (13) along the blade (16) Length direction extension the angle that is formed of reference line, β 4 represents the tangent line of the trailing edge full curve (24d) and the blade Trailing edge (14) along the blade (16) length direction extend reference line formed angle, and α 4 and β 4 along blade open up to Consecutive variations.

6. wind generator set blade (10) according to claim 3, it is characterised in that the leading edge first straight line section Between (23a) and the blade leading edge (13) and between the trailing edge first straight line section (24a) and the blade trailing edge (14), Between the leading edge second straight line section (23b) and the leading edge first straight line section (23a) and the trailing edge second straight line section It is continuously smooth transition between (24b) and the trailing edge first straight line section (24a).

7. wind generator set blade (10) according to claim 4, it is characterised in that the leading edge straight line (23c) with It is continuously smooth mistake between the blade leading edge (13) and between the trailing edge straight line (24c) and the blade trailing edge (14) Cross.

8. wind generator set blade (10) according to claim 5, it is characterised in that the leading edge full curve Between (23d) and the blade leading edge (13) and between the trailing edge full curve (24d) and the blade trailing edge (14) For continuously smooth transition.

9. wind generator set blade (10) according to claim 1, it is characterised in that the tip vane (20) and institute It is continuously smooth transition to state between blade (16).

10. the wind generator set blade (10) according to claim 1 or 9, it is characterised in that the tip vane (20) Aerofoil section it is corresponding with the section of the blade (16).