DE102009038768A1 - Airfoil section for complex geometric shaped rotor blade of wind turbine, has leading edge including flexible outer layer and extended with adjusting unit to ensure adjustment of outer contour of leading edge - Google Patents

Abstract

The section (1) has a leading edge (6) including a flexible outer layer and extended with an adjusting unit to ensure adjustment of an outer contour of the leading edge. The adjusting unit includes a pressure piece that is attached to an inner side of the leading edge. The pressure piece extends along a surface of inner side of the leading edge such that multiple areas of inner side of the leading edge accomplish a relative motion of the pressure plate. A printing unit includes a compression spring and a guide cylinder in which a piston is guided.

Description

The invention relates to a rotor blade profile section for a rotor blade of a wind power plant with a profile nose and a profile trailing edge.

State of the art:

Rotor blades of wind turbines have a complex geometric contour. A two-dimensional cross-sectional profile changes regularly with the length in terms of profile depth, profile thickness, curvature and twisting. The complex geometric contour is to be matched to the expected application. From the DE 102 35 496 A1 a rotor blade for a wind turbine is known, which consists of several rotor blade profile sections.

Object and advantages of the invention:

The invention has for its object to provide a rotor blade for a wind turbine, which is better adapted to changing conditions of use.

This object is solved by the features of claim 1. In the dependent claims advantageous and expedient developments of the invention are given.

The invention is based on a rotor blade profile section for a rotor blade of a wind power plant with a profile nose and a profile trailing edge. The rotor blade profile section preferably corresponds to an element which is obtained when a separation of the rotor blade is made at two points on a rotor blade transversely to its longitudinal extension.

The essential aspect of the invention is that the profile nose has a flexible outer skin, and that adjusting means are provided, with which the profile leading edge can be displaced so as to be able to adjust the outer contour of the profile nose.

This procedure can have a considerable influence on the aerodynamic values of a rotor blade. Rotor blade profiles according to the invention can be arranged in sections on a rotor blade. Several rotor blade profile sections can be arranged one behind the other in the longitudinal direction of a rotor blade. Also possible is a single rotor blade profile section, which essentially forms the rotor blade. In both cases, a continuous continuous flexible nose can be generated. However, only sections along the rotor blade may have an inventive design. A rotor blade profile section may be integrated in a rotor blade or the rotor blade is modularly assembled, of which a module represents the rotor blade profile section.

A flexible profile nose according to the invention can extend over a majority of the front edge along the rotor blade. It may already be great advantages to achieve if only a portion of 20% of the leading edge is configured in such a way. However, it is also possible shares of at least 30%, 40%, 50%, 60%, based on the leading edge of the profile or even larger proportions.

In addition to the aerodynamic influence on the rotor blade, a flexible profile nose is also an ideal deicing device for a rotor blade.

In a particularly preferred embodiment of the invention, the adjusting means comprise a fitting on the inside of the profile nose pressure piece whose position in the rotor blade profile section can be adjusted transversely to a longitudinal extent of the rotor blade. This makes it possible to change the profile nose with its leading edge so that the rotor blade Profilabschitt receives a buoyancy-reducing profile, a neutral profile or a buoyancy-enhancing profile by simple displacement of the pressure piece. To achieve this, the profile nose, for example, can be inclined transversely to a profile chord or center line of the profile in both directions.

The pressure piece can be designed in many ways. It is conceivable a tubular pressure piece, in particular along the flexible profile nose, z. B. extends on the inside of the profile leading edge. The pressure piece can be designed such that it can slide and / or roll on the inside of the profile nose, in particular flexible outer skin, for example, in order to achieve a relative movement between the pressure piece and all areas of the inner side of the flexible outer skin. The pressure piece may comprise a tube which is rotatable, for. B. via a sliding bearing, sitting on a support tube, which is connected to an adjusting mechanism. With a movement of the pressure piece, the rotatably mounted tube can roll on the inside of the flexible profile nose in such a construction. This procedure makes it possible to use flexible materials for the profile nose, which need not only achieve a pre-storage of the profile nose by shortening or expanding material areas around a profile leading edge fixed in the material. Rather, by the advantageous embodiment of the invention z. B. migrate the leading edge in the flexible material, so that a maximum elongation and shortening can remain limited.

Furthermore, it is particularly preferred if the adjusting means comprise pressure means which press the pressure piece from the inside against the flexible outer skin of the profile nose. This allows the flexible outer skin to be kept under pretension. In the simplest case, the pressure means may comprise a compression spring. Also conceivable is a construction based on a piston which moves in a guide cylinder, wherein the piston provides the pressure force. This can be done by the piston is pressurized by a compression spring. However, it is also conceivable a pneumatic or hydraulic pressurization, optionally coupled with elastic elements, such as a compression spring. Thus, the flexible outer skin does not necessarily have elastic properties. It can be flexible or limp. A necessary tension can be achieved by the pressure medium.

In order to be able to set a slope of the profile nose particularly effective, it is further suggested that the position of the pressure piece transversely, in particular perpendicular or substantially perpendicular, to a chord of the rotor blade profile section is displaced. Thus, the profile nose can be tilted up or down or take a "neutral position", which can be responded to aerodynamic requirements. This can be achieved, for example, by the pressure piece being able to shift by one pressure point. Profile chord is understood as a virtual connecting line of the profile leading edge with the lower profile edge.

It is also advantageous if the position of the pressure piece is displaceable along a chord of the rotor blade profile section. Thus, not only the leading edge of a flexible profile nose can be kept under tension, but it is also conceivable to make a configuration such that it allows the tread depth to increase or decrease. This can be realized, for example, in that the pressure piece can translate along a lever.

In order to obtain a desired aerodynamic behavior of the rotor blade with a flexible profile nose, it is further proposed that the flexible outer skin of the profile nose and the adjusting means are matched to one another such that the outer skin is completely tensioned in a setting position. This gives a defined surface of the profile nose, without possibly waves or wrinkles, with a predictable pressure resistance across, z. B. perpendicular to the surface.

In a preferred embodiment, the embodiment is realized in such a way that in each setting position results in a completely stretched outer skin of the profile nose.

The flexible outer skin can realize various flexible properties in isolation or in combination. The outer skin can be flexible and elastic at the same time. In this way, a large elastic adjustment can be achieved in a change in shape. In this case, the material may be designed so that it allows an elastic change in length as in a rubber material and / or an elastic twisting and / or bending as in an elastic sheet material. Also conceivable is a flexible or pliable outer skin with virtually no elastic properties, similar to a tent fabric or tarpaulin material. In this case, the adjustment means should provide an elastic force to reach a chamfered surface of the profile nose.

In a further preferred embodiment of the invention, the pressure piece is arranged on at least one pivotally mounted lever about an axis. The pivot axis of the lever preferably runs along the longitudinal extent of the rotor blade profile section, z. B. perpendicular to a chord. It is conceivable for a chord to cut the pivot axis, in particular when the rotor blade profile section is in an "aerodynamic neutral position".

A deflection of the lever about its pivot axis results in a displacement of the pressure piece transversely to a chord, so that rotor blade profiles are in particular continuously adjustable, for example from buoyancy-reducing through neutral to buoyancy-increasing.

In particular, in connection with a pivotally mounted lever, it is preferred if the adjusting means have a displacement unit for adjustability of the pressure piece transversely to a chord of the rotor blade profile section.

In one embodiment, an adjustment of the pivotally mounted lever by an interaction of spring and / or pneumatic or hydraulic tension and / or pressure elements can be realized. For example, the pivotally mounted lever is clamped in one place such that on one side of this point a compression spring and on the opposite side a pneumatic tension and / or pressure element acts. These elements in isolation are also possible.

Furthermore, it is preferred if the displacement unit is adjustable from outside the rotor blade profile section. This makes it possible, a rotor blade during operation from the outside to the current conditions of the site adapt, z. B. via hydraulic or pneumatic lines and / or an electrical connection to an actuator.

An adjustability from the outside can also bring advantages in order to be able to displace the position of the pressure piece along a chord of the rotor blade profile section, so that a tread depth can be changed controlled from the outside.

In order to obtain a high level of safety of a rotor blade profile section according to the invention, it is also proposed that the displacement unit is designed such that in the event of a power failure, the displacement unit assumes a predefined position, which in particular represents a safety position.

For an additional influencing of the contour of the flexible outer skin is further suggested that the flexible outer skin sections has a different flexibility. It is conceivable z. B. a plastic material having areas with different elasticity. A different elasticity can also be achieved by specifically predetermined material thickening of the flexible outer skin. In addition, elements can be stored in the outer skin and / or externally attached, which have a greater rigidity than the outer skin itself, possibly completely rigid. For example, the flexible outer skin contains local stiffening agents. This can still be obtained with high flexibility of a flexible profile nose a comparatively high stability of the flexible profile nose.

An inventive rotor blade profile section is preferably part of a rotor blade for a wind turbine.

With one or more rotor blade profile sections according to the invention, an adaptive rotor blade can be realized, whereby unwanted sharp edges, gaps or openings can be avoided in a comparatively large adjustment range due to the flexible outer skin.

By changing the profile nose contour, especially by changing the inclination of the profile nose with respect to the chord, the aerodynamic properties of the rotor blade profile, such as buoyancy value and drag coefficient, can be significantly influenced.

Thus, with an actively controllable in their inclination front edge of the profile nose control of a power of a rotor of a wind turbine can be achieved.

For a further improvement of an aerodynamic shape of an adjustable profile nose, it is further proposed in a preferred embodiment that volume-filling support means are provided in the profile nose, which support the inside of the flexible outer skin. The volume-filling support means preferably extend over the largest part of the volume of the adjustable profile nose on the inside. In particular, the volume-filling proppants occupy more than 50% of the volume of the adjustable profile nose, preferably 60, 70, 80 or even 90%.

The volume-filling support means may comprise hollow bodies and / or be designed as elastically resilient and thus deformable elements, for. B. in the form of one or more silicone pads.

In a further preferred embodiment of the invention, the volume-filling support means of an actuating element, for. B. penetrated a lever for the pressure piece. It is conceivable that the volume-filling support means occupy almost the entire area of an adjustable profile nose, wherein a recess is provided for a Hebelunterbringun in the volume-filling support means and also for a voltage applied to the profile nose edge pressure element. A volume-filling proppant can be one or more parts. It can be composed of differently shaped support elements having different material properties. For example, comparatively compliant elements can be combined with stiff elements to achieve a desired deformation characteristic when the profile nose changes.

Drawings:

Several embodiments of the invention are illustrated in the drawings and are explained in more detail below, giving further details and advantages.

Show it

1 in a perspective view of a rotor blade profile section,

2 in perspective view a profile nose with adjustment mechanism,

3 a profile nose according to 2 in a side view,

4 in perspective view a detail of another rotor blade section,

5 a side view of the representation 4 .

6 a side view of a profile nose in a schematic representation,

7 the profile nose off 6 in a different tilt position in a schematic side view and

8th another profile nose in a schematic side view

Description of the embodiments:

In 1 is a rotor blade profile section 1 pictured, which may be part of a rotor blade of a wind turbine. The rotor blade profile section 1 includes a rigid profile section 2 that goes up to a trailing edge 3 of the profile 1 extends as well as a flexible profile section 4 that goes up to a leading edge 5 extends. At a separation point 1a bump the two sections 2 and 4 each other. In the flexible profile section 4 is a profile nose 6 , So the front portion of the rotor blade section 1 , flexibly designed. The profile nose 6 has a rigid support frame 7 on which a flexible outer skin 8th is appropriate. A thickness d of the flexible outer skin 8th becomes the leading edge 5 lower. This favors that the profile nose 6 assumes a nose shape in its cross-sectional view.

To the profile nose 6 To give a tight outer contour is a pipe 9 provided on the inside of the flexible outer skin 8th the profile leading edge 5 lying opposite.

The pipe 9 is rotatable on an inner tube 10 stored. The storage can z. B. via rolling bearings or plain bearings 11 respectively.

The inner tube 10 is on one side of preferably several two-sided levers 12 mounted, with a pivot point 13 on a crossbeam 14 in the frame 7 is arranged. In order to obtain a stable construction, are in 2 two crossbeams 14 provided, between which at the fulcrum 13 the lever 12 is pivotally mounted.

By pivoting the lever 12 rolls the rotatably mounted pipe 9 , the Z. B. at a stop of the inner tube 10 on the lever 12 is divided, on an inside 15 the flexible outer skin 8th which reduces the position of the leading edge 5 the profile nose 6 in relation to the rest of the profile 1 changes. As a result, the buoyancy behavior of the rotor blade profile can be adjusted.

To adjust the lever position different solutions are conceivable. In 2 is that the pipe 9 opposite end of the two-sided lever 12 between a spring element 16 and a linear actuator 17 clamped. In the spring element 16 it can be a compression or tension spring. The linear actuator 17 can be configured as a tensile and / or pressure element.

The spring element 16 and the linear actuator 17 are on a mounting element 18 attached, as an abutment for receiving the forces from the spring element 16 or the linear actuator 17 serves. The mounting element is preferably on the support frame 7 , as in 2 shown, attached, z. B. also like the lever 12 between the crossbeams 14 ,

The system of spring element 16 and linear actuator 17 is preferably designed so that in case of a power failure associated with a pressure drop across the linear actuator 17 the lever 12 by the spring element 16 is brought into a position which represents a safe position for the rotor blade profile.

Depending on the position of the pipe 9 the rotor blade profile can provide various aerodynamic properties.

In 3 is one too 2 corresponding profile nose shown in the side view, but with the difference that the lever 12 not like in 2 as a rigid lever, but as a spring-loaded lever 19 is executed.

The spring-loaded lever 19 owns between the fulcrum 13 and the tube 9 a spring unit 20 , consisting of a guide cylinder 21 , a piston 22 who is in the lead cylinder 21 is guided and a compression spring 23 that in the guide cylinder 21 between a rear end of the guide cylinder 21 and one end of the piston 22 sitting.

The compression spring 23 is compressed, so the pipe 9 under pressure on the inside of the flexible outer skin 8th is applied. This can be ensured that in various pivotal positions, in 3 by a double arrow 24 are symbolized, the outer skin 8th always has a desired bias, so that a changed profile can be adjusted with the necessary stability.

In the 4 and 5 is a further embodiment of a rotor blade profile shown. Structurally, this embodiment corresponds to the realization according to 3 , but with the difference of a differently designed flexible outer skin 8th ,

First, the wall of the flexible outer skin 8th in the area of the front edge 5 around the pipe 9 around much thinner in thickness than the wall, extending to the support frame 7 continues. For example, the thinner wall area has less than half the thickness of the remaining wall areas of the flexible skin 8th , This can in particular a high deformability of the front portion of the profile nose 6 be achieved. The contour of the profile nose 6 can thus be controlled in a wide range.

In addition, in the flexible outer skin 8th a stiffening element 25 stored. This makes this area more stable than the other remaining areas of the profile nose 6 designed and around the stiffening element 25 around practically barely deformable. This also allows very specific influence on a desired contour of the profile nose 6 be taken. This is also possible because of the wall of the flexible outer skin 8th targeted thickening 26 has, which also strongly influence a bending behavior or an elastic deformability.

By wall thickness variation of the flexible outer skin 8th and / or incorporation of elements with different elasticity from the outer skin, possibly rigid elements, a contour influence of the profile nose can be achieved in a wide range.

A contour influencing the profile nose can also be by an embodiment according to the 6 to 8th to reach.

In 6 is a flexible profile nose 27 shown a flexible outer skin 8th includes. On the inside of the flexible outer skin is a rollable on the inside or against the inside sliding pressure piece 28 present, that at a lever 29 sitting around a pivot 30 is pivotable, which in a holding element 31 is positioned. Both sides of the lever 29 is a volume-filling fitting 32 educated. The fitting 32 can be one or more parts. In the embodiment according to 6 and 7 it takes the largest part of a volume 33 the flexible profile nose to the holding element 31 one. Through the fitting 32 becomes the flexible outer skin 8th given the desired shape. Even after a change in position of the pressure piece 28 by pivoting the lever 29 on the frame 31 can be ensured by a desired aerodynamic shape of the flexible profile nose (see 7 ).

The embodiment of a flexible profile nose 34 according to 8th differs from the embodiment according to the 6 and 7 in that a fitting 35 consisting of fitting areas 36 and 37 together with the lever 29 form a common structure, eg. B. such that the fitting 35 firmly with the lever 29 connected is. Upon movement of the lever then inevitably the fitting portions 36 and 37 moved. The fitting 35 can have elastically yielding properties. As in 8th shown, it may be formed as a hollow body. Through the fitting 35 in interaction with the swiveling lever 29 and the pressure piece 28 can be a desired aerodynamic shape of the flexible profile nose 34 be achieved.

LIST OF REFERENCE NUMBERS

1

Airfoil section

1a

separation point

2

rigid profile section

3

trailing edge

4

flexible profile section

5

leading edge

6

profile nose

7

holding frame

8th

flexible outer skin

9

pipe

10

inner tube

11

camp

12

lever

13

pivot point

14

crossbeam

15

inside

16

spring element

17

linear actuator

18

mounting element

19

Sprung lever

20

spring unit

21

guide cylinder

22

piston

23

compression spring

24

double arrow

25

stiffener

26

thickening

27

profile nose

28

Pressure piece

29

lever

30

pivot point

31

halt

32

fitting

33

volume

34

profile nose

35

fitting

36

Fitting area

37

Fitting area

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10235496 A1 [0002]

Claims (26)

Rotor blade profile section ( 1 ) for a rotor blade for a wind turbine with a profile nose ( 6 . 27 . 34 ) and a profile trailing edge ( 3 ), Characterized in that the profiled nose ( 6 . 27 . 34 ) a flexible outer skin ( 8th ) and that adjusting means ( 9 . 10 . 11 . 12 . 16 . 17 . 20 . 29 ) are provided, with which the profile leading edge ( 5 ), in order that the outer contour of the profile nose ( 6 . 27 . 34 ) to adjust. Rotor blade section according to claim 1, characterized in that the adjusting means ( 9 . 10 . 11 . 12 . 16 . 17 . 20 . 29 ) on the inside ( 15 ) the profile nose ( 6 . 27 . 34 ) fitting pressure piece ( 9 . 28 ) whose position in the rotor blade profile section is adjustable transversely to a longitudinal extension of the rotor blade profile section. Rotor blade section according to claim 1 or 2, characterized in that the adjusting means ( 9 . 10 . 11 . 14 . 16 . 17 . 20 . 29 ) on the inside ( 15 ) the profile nose ( 6 . 27 . 34 ) fitting pressure piece ( 9 . 27 . 34 ), which is designed such that the pressure piece ( 9 . 27 . 34 ) can shift along the surface of the inside, so that all areas of the inside a relative movement to the pressure piece ( 9 . 27 . 34 ) To run. Rotor blade section according to one of the preceding claims, characterized in that the pressure piece ( 9 . 27 . 34 ) is designed to unroll on the inside of the profile nose. Rotor blade section according to one of the preceding claims, characterized in that the adjusting means pressure medium ( 20 ), which the pressure piece ( 9 ) from the inside ( 15 ) against the flexible outer skin ( 8th ) the profile nose ( 6 ) to press. Rotor blade section according to one of the preceding claims, characterized in that the pressure means ( 20 ) a compression spring ( 23 ). Rotor blade section according to one of the preceding claims, characterized in that the pressure means ( 20 ) a piston ( 22 ) and a guide cylinder ( 21 ), in which the piston ( 22 ) is guided. Rotor blade section according to one of the preceding claims, characterized in that the position of the pressure piece ( 9 ) is displaceable transversely to a chord of the rotor blade profile section. Rotor blade profile section according to one of the preceding claims, characterized in that the pressure piece for carrying out a rotation about a pivot point ( 13 . 30 ) is designed and thereby a shift is made possible across the chord. Rotor blade section according to one of the preceding claims, characterized in that the position of the pressure piece ( 9 ) is displaceable along a chord of the rotor blade profile section. Rotor blade section according to one of the preceding claims, characterized in that the pressure piece ( 9 ) for performing a translation movement along a lever ( 12 ) is designed and thereby a shift towards chord is enabled. Rotor blade section according to one of the preceding claims, characterized in that the flexible outer skin ( 8th ) the profile nose ( 6 . 27 . 34 ) and the adjustment means ( 9 . 10 . 11 . 12 . 16 . 17 . 20 . 29 ) are matched to one another such that the outer skin ( 8th ) is fully tensioned in a setting position. Rotor blade section according to one of the preceding claims, characterized in that the pressure piece ( 9 . 27 . 34 ) is tubular. Rotor blade section according to one of the preceding claims, characterized in that the pressure piece ( 9 . 27 . 34 ) on at least one lever pivotally mounted about an axis ( 12 . 29 ) is arranged. Rotor blade profile section according to one of the preceding claims, characterized in that for an adjustability of the pressure piece ( 9 . 27 . 34 ) transverse to a chord of the rotor blade profile section, the adjusting means a displacement unit ( 16 . 17 . 20 . 29 ). Rotor blade section according to one of the preceding claims, characterized in that the displacement unit ( 16 . 17 . 20 . 29 ) is adjustable from outside the rotor blade section, preferably outside of a rotor blade or rotor. Rotor blade section according to one of the preceding claims, characterized in that the displacement unit ( 16 . 17 . 20 . 29 ) is designed such that in case of power failure, the displacement unit assumes a predefined position. Rotor blade section according to one of the preceding claims, characterized in that the flexible outer skin ( 8th ) has a different flexibility in sections. Rotor blade section according to one of the preceding claims, characterized in that the flexible outer skin ( 8th ) local stiffening agents ( 25 . 26 ) contains. Rotor blade section according to one of the preceding claims, characterized in that in the profile nose ( 27 . 34 ) are provided volume-filling support means, the inside of the flexible outer skin ( 8th ) support. Rotor blade profile section according to one of the preceding claims, characterized in that the volume-filling support means at least one body ( 32 . 35 ), which fills a large part of the adjustable profile nose. Rotor blade profile section according to one of the preceding claims, characterized in that the volume-filling support means comprises a hollow body ( 35 ). Rotor blade section according to one of the preceding claims, characterized in that the volume-filling support means are elastic and yielding. Rotor blade section according to one of the preceding claims, characterized in that the volume-filling support means an elastic form element ( 32 . 35 ). Rotor blade section according to one of the preceding claims, characterized in that the volume-filling support means of an actuating element ( 29 ), which the pressure piece ( 28 ), are penetrated. Rotor blade for a wind turbine with at least one rotor blade profile section according to one of the preceding claims.

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