WIND TURBINE ROTOR BLADE

Abstract

A wind turbine rotor blade (1) with a blunt, wide and/or cut off trailing edge (15) in a hub region (111), with an air-conducting channel (23) extending radially outward for conducting suctioned air from a suction region (21) to a blow-out region (22) arranged in the blade tip region (113) inside the wind turbine rotor blade (1), wherein and boundary layer suctioning occurs on the top side (13) of the wind turbine rotor blade (1), and a boundary layer fence (28) is provided in the hub region (111) near the hub fastening means (17) in order to prevent a flow in the direction of the hub fastening means (17).

Claims

1. A wind turbine rotor blade (1) having a top side (13), a bottom side (14), a leading edge (16), a trailing edge (15), a hub fastening means (17) and a blade tip (12) wherein the wind turbine rotor blade (1) has a hub region (111), a center region (112), and a blade tip region (113), and wherein a root region (11) is defined from the hub fastening means (17) to the maximum blade depth (Smax), wherein an air-conducting channel (23) is provided inside the wind turbine rotor blade (1) extending radially outward for conducting suctioned air from a suction region (21) to a blow-out region (22) arranged in the blade tip region (113), and a boundary layer suctioning occurs in a suction area (21) where a suctioning of the air from the top side (13) of the wind turbine rotor blade (1) occurs, a boundary layer fence (28) is provided in the hub region (111) near the hub fastening means (17) in order to prevent a flow in the direction of the hub fastening means (17), the trailing edge (15) in the hub region (111) and at least in the first section of the central region (112) connected thereto is blunt, wide and/or cut off running in the direction of the blade tip region (113), wherein this continues in the root region (11) towards the direction of the blade tip (12), the suction area (21) is arranged in the area in which a laminar air flow detaches from the top side (13) based on the rotor blade geometry, so that an attachment and continuation of laminar air flow along the top side (13) occurs, and the suction area (21) starting at or near the boundary layer fence (28) in the hub area (111) extends into the central region (112), wherein the suction area (21) extends over the root region (11) in the direction of the blade tip (12) in the center region (112).

2. The wind energy turbine rotor blade (1) according to claim 1, wherein the suction area (21) includes a plurality of openable and closable suction segments which can be opened and/or closed as a function of a relocation of the point at which laminar flow changes to turbulent (X) on the top surface (13) due to rotor blade geometry, which migrates due to a rotation of the rotor blade at the hub for adapting the angle of attack of the rotor blade to the wind, whereby a changeable suction line is formed.

3. The wind energy turbine rotor blade (1) according to claim 1, wherein the maximum blade depth (Smax) of the wind turbine rotor blade (1) is provided in the hub region (111) or in the first section of the central region (112) and the blade depth (Sgr) decreases from the maximum blade depth (Smax) to the boundary layer fence (28).

4. The wind energy turbine rotor blade (1) according to claim 1, wherein the suction area (21) is arranged in the section of the surface from 40% of the local blade depth (Sx) from the leading edge (16) to 5% of the local blade depth (Sx) from the trailing edge (15).

5. The wind energy turbine rotor blade (1) according to claim 4, wherein the suction area (21) in the hub region (111) is arranged in the section of the surface from 40% of the local blade depth (Sx) from the leading edge (16) to 30% of the local blade depth (Sx) from the trailing edge (15).

6. The wind energy turbine rotor blade (1) according to claim 1, wherein the blade inner body of the rotor blade (1) is used as an air-conducting channel.

7. The wind energy turbine rotor blade (1) according to claim 1, wherein a conventional rotor blade is retrofitted with add-on components.

8. The wind energy turbine rotor blade (1) according to claim 7, wherein the add-on components are segmented.

9. The wind energy turbine rotor blade (1) according to claim 1, wherein the blade tip (12) of a rotor blade known in the prior art is retrofitted with an add-on component which does not extend the rotor blade overall length.

10. The wind energy turbine rotor blade (1) according to claim 1, wherein the blade tip (12) of a conventional rotor blade is retrofitted by an extension component which extends the rotor blade in its total length by 0.5 to 7 m.

11. The wind energy turbine rotor blade (1) according to claim 8, wherein the segmented cultivating components have at least one boundary layer fence portion (28, 28′).

12. The wind energy turbine rotor blade (1) according to claim 1, wherein a valve for controlling the boundary layer influencing is arranged in the air-conducting channel (23).

13. The wind energy turbine rotor blade (1) according to claim 1, wherein transport means are provided for actively influencing the boundary layer by means of air conduction within the air-conducting channel (23), so that air can be transported both from the suction area (21) to the blow-out area (22) as well as in the opposite direction.

14. The wind energy turbine rotor blade (1) according to claim 1, wherein the openings of the suction region (21) and/or of the blow-out region (22) are designed as bores and/or slots.

Description

[0056] Exemplary embodiments of e invention are described in detail below with reference to the accompanying drawings.

[0057] Therein:

[0058] FIG. 1 is a schematic representation of an exemplary embodiment of a wind turbine rotor blade known in the prior art with the conversion according to the invention;

[0059] FIG. 2 is a schematic representation of a second exemplary embodiment of a wind energy turbine rotor blade as a new rotor blade;

[0060] FIG. 3 shows a schematic cross-section of a wind turbine rotor blade known in the prior art, showing the flow and the transition point;

[0061] FIG. 4 shows a schematic cross-section of the wind turbine rotor blade according to the invention, showing the flow and the transition point;

[0062] FIG. 5 shows a schematic representation of a third exemplary embodiment of a wind turbine rotor blade in a segmented construction in a three-dimensional representation;

[0063] FIG. 6 is a schematic representation of the third exemplary embodiment of a wind turbine rotor blade, shown in FIG. 5, in a segmented construction in a top view;

[0064] FIG. 7 is a schematic representation of the wind turbine rotor blade shown in FIG. 1 with sections at different points of the wind turbine rotor blade with different blade depths;

[0065] FIG. 8a) to g) are cross-sections through the wind turbine rotor blade shown in FIG. 1, with the ratios r/R= . . . , where a) is a section at 0.03, b) 0.05, c) 0.1, d) 0.2, e) 0.25, f) 0.3 and g) 0.4/0.5 spaced from the hub;

[0066] FIG. 9 shows a schematic illustration of a first exemplary embodiment of the wind energy turbine rotor blade according to the invention on a wind power installation;

[0067] FIG. 10 shows a schematic representation of a second exemplary embodiment of the wind turbine rotor blade according to the invention on a wind power installation, and FIG

[0068] FIG. 11 shows a schematic representation of a third exemplary embodiment of the wind energy turbine rotor blade according to the invention on a wind power installation.

[0069] FIG. 1 shows a schematic representation of an exemplary embodiment of a wind turbine rotor blade 1 known in the prior art, with the conversion according to the invention.

[0070] The wind energy turbine rotor blade 1 comprises a blade tip 12, a top side 13, a bottom side 14, a trailing edge 15, a leading edge 16 and a hub fastening means 17.

[0071] A suction component 31 with a suction area 21 provided therein as well as a blow-out component 32 with an extended rotor blade tip and winglet 29 are arranged on the existing wind turbine rotor blade 1. Furthermore, the air-conducting channel 23, which is arranged at the suction area 21 and is directed up to the blow-off area 22, is shown.

[0072] The wind energy turbine rotor blade 1 is divided into a hub region 111, a central region 112 and a blade tip region 113, which represent the respective wind turbine blade rotor sections.

[0073] In this illustration, the newly designed trailing edge 15, which has been reconfigured by the attached suction attachment part 31, is clearly visible. The trailing edge 15 is now designed to be blunt, wide and/or cut off starting from the new boundary layer fence 28 out to the transition point into the old trailing edge 15.

[0074] Furthermore, the arrangement of the suction area 21 can clearly be seen, which is not arranged as in the prior art on the trailing edge 15, on the top side 13 near the trailing edge 15, or undefined in the unclear areas of the top side 13, but rather is arranged along a transition point line in which the laminar flow of the air surrounding the wind energy turbine rotor blade 1 turns into a turbulent flow.

[0075] Only by means of this very special configuration is a considerable increase in efficiency possible compared to the known wind turbine rotor blades.

[0076] In the following, the same reference symbols as in FIG. 1 are used for the same elements. Reference is made to FIG. 1 for their principal function.

[0077] FIG. 2 shows a schematic illustration of a second exemplary embodiment of a wind turbine rotor blade 1 as a new rotor blade.

[0078] The suction region 21, the blow-out region 22 and the air-conducting channel 23 are shown.

[0079] FIG. 3 shows a schematic cross-section of a wind turbine rotor blade 1 known in the prior art, showing the flow and the transition point X.

[0080] At the transition point X, the initially laminar airflow begins to turn into a turbulent air flow, which leads to a worsening of the efficiency and also to an increased contamination of the top side 13 of the wind turbine rotor blade 1.

[0081] FIG. 4 shows a schematic cross section of the wind turbine rotor blade 1 according to the invention, showing the flow and the transition point X.

[0082] By means of the suction provided in the suction area 21 in combination with the blunt, wide and/or cut-off trailing edge 15 of the wind turbine rotor blade 1, the air flow which is still laminar remains attached at the transition point X to the additional flat element, whereby the energy yield of the overall wind energy installation W is increased by 15%. The turbulent flow does not develop until much later and, in combination with the blunt, wide and/or cut-off trailing edge 15, leads to a further increase in the energy output yield of the wind energy installation W.

[0083] FIG. 5 shows a schematic representation of a third exemplary embodiment of a wind turbine rotor blade 1 in a segmented construction embodiment in a spatial representation.

[0084] Six segments of the suction component 31 are installed on a wind turbine rotor blade 1 to be converted. Each of these segments 31 has a boundary layer fence 28 or 28′ on the left-hand side in the front-edge direction. During assembly, for example, in the open field, good transitions can be realized from an aerodynamic viewpoint as well as from a montage view.

[0085] FIG. 6 shows a schematic representation of the third embodiment of a wind turbine rotor blade 1 shown in FIG. 5 in a segmented construction embodiment in a top view of the top side 13.

[0086] FIG. 7 shows a schematic representation of the wind turbine rotor blade 1 shown in FIG. 1 with sections at different points of the wind turbine rotor blade 1 with different blade depths Smax, Sgr, Smb, Sx.

[0087] FIG. 8a) to g) show cross sections through the wind turbine rotor blade shown in FIG. 1 with the ratios r/R= . . . , where a) a section at 0.03, b) 0.05, c) 0.1, d) 0.2, e) 0.25, f) 0.3 and g) 0.4/0.5 spaced from the hub.

[0088] In this case, the larger circumferences of the cross sections represent the new design and the smaller cross sections the original design of an upgraded wind turbine rotor blade 1.

[0089] FIGS. 9, 10 and 11 show schematic illustrations of three exemplary embodiments of the wind turbine rotor blade 1 according to the invention on a wind power installation W.

[0090] The wind energy installation W consists of a wind turbine tower T mounted on a foundation, a generator housing mounted on the wind energy tower T, on which a hub with three wind turbine rotor blades 1 arranged thereon is provided.

[0091] In order to convert existing wind energy installations W, an assembly device M or work platform can be lowered from the generator housing or, alternatively, be raised from the below and raised up the wind energy installation tower T or to the wind energy turbine rotor blade 1 in order to connect the suction attachment part 31 or the segmented add-on part 31′ or as the case may be the blow-out component 32 as well as the air-conducting channel 23 (not shown).

REFERENCE LIST

[0092] 1 Wind energy turbine rotor blade

[0093] 11 Root region

[0094] 111 Hub region

[0095] 112 Center region

[0096] 113 Blade tip region

[0097] 12 Blade tip

[0098] 13 Top side

[0099] 14 Bottom side

[0100] 15 Trailing edge

[0101] 16 Leading edge

[0102] 17 Hub fastening means

[0103] 21 Extraction area

[0104] 22 Blow out area

[0105] 23 Air-conducting channel

[0106] 28, 28′ Boundary layer fence

[0107] 29 Winglet

[0108] 31, 31′ Suction component

[0109] 32 Air blow-out component

[0110] M Mounting device

[0111] Smax Maximum blade depth/shoulder depth

[0112] Sgr Blade/shoulder depth in the area of the boundary layer

[0113] Smb Blade/shoulder depth in the area of the center region

[0114] Sx Local blade depth at the point of the rotor blade

[0115] T Wind energy tower

[0116] W Wind energy installation

[0117] X Transition point laminar into turbulent flow

[0118] .fwdarw. Airflow