DE102011052982A1 - Wind power plant, has rotor comprising rotatably supported rotor blade, and guiding device arranged at blade and staying in effective fluid connection with collecting device, where air is guided along blade through guiding device - Google Patents

Abstract

The plant (10) has a rotor (20) comprising a rotatably supported rotor blade (26), and a collecting device for collecting air. A guiding device is arranged at the rotor blade, and stays in effective fluid connection with the collecting device, where the air is guided along the rotor blade through the guiding device. The collecting device is connected with the rotor in a torque-proof manner, where an axis of the collecting device is oriented parallel and coaxial to a rotational axis (21) of the rotor. A channel device stays in effective fluid connection with the collecting device. An independent claim is also included for a method for operating a wind power plant.

Description

The invention relates to a wind turbine, comprising at least one rotor with rotor blades, which is rotatably mounted.

Furthermore, the invention relates to a method for operating a wind turbine.

The invention has for its object to provide a wind turbine, which has a high efficiency even at lower wind speeds.

This object is achieved according to the invention in the wind turbine mentioned above in that a collecting device is provided, through which air can be collected, and a guide means is provided, which is arranged on a rotor blade and in fluidly effective connection with the collecting device and by which air along the corresponding rotor blade is feasible.

In the solution according to the invention, the collecting device ensures that air is "collected" and forwarded to a corresponding guide device of a rotor blade. Air can be guided along the rotor blade via the guide device. In particular, the centrifugal force on a rotating rotor ensures the conveyance of air to the guide device in the direction of the tip of a rotor blade.

By guiding the air along the rotor blade, there are different possibilities for influencing the rotation of the rotor. In one embodiment, boundary air flow is influenced by the guidance of air on an outer surface of the rotor blade. In an alternative or combined embodiment, air in the guide device is guided into a channel inside a rotor blade and blown out. The blowing out takes place, for example, in such a way that a recoil takes place on the rotor blade. Alternatively or additionally, it can take place in the region of a flow separation region and be influenced positively.

By means of the solution according to the invention, a flow influencing of the outer flow on a rotor blade can be achieved. This flow influencing can be influenced, for example, by the mass flow of the air guided in a guide device and can also be influenced by the flow behavior on the guide device.

The boundary layer of the outer flow on a rotor blade can be influenced in particular so that the wall friction is reduced. It can counteract a noise development. The material load on the rotor blade can be reduced. In particular, a flutter can also be reduced. A longer flow around the outside increases efficiency. Furthermore, the static strength including the rigidity can be increased. Furthermore, natural frequencies of the rotor blade can be influenced. If a recoil effect is achieved, then even low wind speeds (in particular below 3 m / s) can be used effectively for obtaining electrical energy.

In particular, the collecting device is arranged on a hub and / or in front of a hub of the rotor. "Before" refers to a wind direction. As a result, air can be effectively collected to supply to the rotor blade, whereby the direct application of wind to a rotor blade is minimally affected. The arrangement of the collecting device on the hub also allows air flows to be effectively divided among a plurality of rotor blades.

The collecting device may be rotatably connected to the at least one rotor or non-rotatably arranged with respect to a holding device, on which the at least one rotor is rotatably mounted. In a rotationally fixed arrangement of the collecting device on the at least one rotor can be easily achieved a division of the air currents to different rotor blades. In a rotationally fixed arrangement with respect to the holding device, the rotating mass can be reduced.

In one embodiment, the collector comprises one or more funnels. Such a funnel has a mouth opening, wherein a cross section of the funnel tapers away from the mouth opening towards the rotor blades. It can thereby collect air in a simple design and forward and also compress.

In particular, an axis of the collecting device is oriented parallel and in particular coaxially to a rotational axis of the at least one rotor. The axis of the collecting device is in particular an axis of symmetry and in particular an axis for a rotationally symmetrical design of the collecting device.

It may additionally be provided that a channel device is in fluid-effective connection with the collecting device, wherein the channel device supplies cooling air to a transmission device and / or braking device and / or generator device. It can thereby be branched off from the collector air and as cooling air for others Facilities of the wind turbine and in particular use a generator device.

In one embodiment, the collecting device and / or the guide device is associated with a compressor device. The compressor device provides as an alternative to centrifugal force or together with the centrifugal force for a promotion of air in a guide device. The compressor device is operated, for example, with electric current generated by the wind turbine. By the compressor device, the pressure in an air flow in the guide device can be increased or adjusted to an optimized value.

In one embodiment, the guide device has one or more channels, which are arranged in the rotor blade. Such a channel is hidden in the rotor blade positioned. The rotor blade can be guided through air and then blow out at a certain area, for example to achieve a recoil effect.

In particular, at least one blow-off element is assigned to the channel (s) through which air can be blown out on the rotor blade. Such a blow-out element has a blow-out opening, via which air can leave the rotor blade. For example, a blow-out element comprises a nozzle.

The at least one blow-out element is, for example, arranged and designed such that a blow-off direction is opposite to a direction of rotation of the at least one rotor. This can be a recoil effect. As a result, it is also possible to effectively use lower wind speeds for power generation.

Alternatively or additionally, it can also be provided that the at least one blow-off element is arranged and designed so that air can be blown out at a flow separation region on the rotor blade. As a result, a boundary layer for an outer flow on the rotor blade can be influenced and, for example, influenced in such a way that a flow resistance on the rotor blade for an outer flow is reduced.

In particular, the at least one blow-off element is located closer to a tip of the rotor blade than to a hub, and in particular, a distance of the at least one blow-off element to the tip is at most 10% of a total length of the rotor blade between the hub and the tip. As a result, an effective torque for generating a recoil can be achieved.

In an alternative or combined embodiment, the guide device has one or more channels, which are arranged on a surface of the rotor blade and in particular are open to an outer side. This makes it possible to positively influence a boundary flow on the rotor blade and in particular to influence it such that the flow resistance is reduced.

It is advantageous if the channel or channels are designed as turbulators and / or provided with a turbulence-generating device. As a result, an optimized separation point can be set, for example to minimize flutter of a rotor blade.

It is favorable if the channel or channels have a width which is at most 10% and in particular at most 5% and in particular at most 1% of a width of the rotor blade between a profile leading edge and a profile trailing edge. As a result, a corresponding channel can effectively act as a turbulator and at the same time negatively influence the flow outside of the turbulator formation on the rotor blade to a minimum extent.

The aforementioned object is further achieved according to the invention in that a plurality of successively arranged rotors is present, in particular with coaxial axes of rotation. It can also be used by small wind speeds effectively.

It is particularly advantageous if at least one first rotor and one second rotor are provided, which are arranged in opposite directions. As a result, even at low wind speeds, high effective speeds can be achieved as effective speeds between the first rotor and the second rotor.

It is advantageous if a first part of a generator device is non-rotatably connected to the first rotor and a second part of the generator device is non-rotatably connected to the second rotor, wherein electrical current can be generated by rotation of the first part and / or the second part. This results in an effective power generation. In particular, the power is generated by relative rotation of the first part to the second part. For example, one part is a stator and the other part is a rotor of the generator device.

It can be provided that the generator device is arranged between the first rotor and the second rotor. This results in an effective mass balance.

In one embodiment, the first rotor and the second rotor are associated with an outer shell, within which the first rotor and the second rotor are arranged, wherein in particular the outer jacket is arranged coaxially to a rotational axis of the first rotor and / or second rotor. This makes it possible to achieve an optimized flow guidance, in particular for the air supply to the second rotor.

It may be provided that the outer jacket has at least one region which has a constant cross section and / or has a tapering cross section away from the hub and / or has a widening cross section away from the hub. Depending on the design of the rotors and conditions, such areas can also be combined.

For example, the outer shell is formed as an expansion nozzle with a tapered region, followed by an expanding region. As a result, even low wind speeds (in particular below 3 m / s) can be used effectively.

It can be provided that the first rotor and the second rotor have a same diameter or have different diameters.

An effective air guide results, for example, when an air guiding device is arranged between the first rotor and the second rotor. This louver affects the flow of air which is supplied to the second rotor.

For example, the air guiding device comprises a guide grid, which in particular has a circular outer contour.

The invention is also based on the object to provide a method of the type mentioned, with which even lower wind speeds can be used effectively.

This object is achieved in the method mentioned above according to the invention that in the region of a hub at least one rotor air is collected and the collected air is guided along a rotor blade in the rotor blade and / or on an outer side of the rotor blade.

The method according to the invention has the advantages already explained in connection with the wind power plant according to the invention.

Further advantageous embodiments of the method according to the invention have also already been explained in connection with the wind turbine according to the invention.

The inventive method can be carried out in particular on the wind turbine according to the invention or the wind turbine according to the invention can be operated with the inventive method.

In one embodiment, air conducted in the rotor blade is blown out in a direction opposite to a direction of rotation of the rotor on the rotor blade. This results in a recoil for the rotor. In turn, even lower wind speeds (even below 3 m / s) can be effectively used or made usable.

It may alternatively or additionally be provided that air is blown out at a flow separation area on the rotor blade. This can effectively influence a boundary layer flow.

It may be advantageous if at least a first rotor and a second rotor, which are arranged one behind the other, are rotated in opposite directions to each other. As a result, high relative rotational speeds between the first rotor and the second rotor can be achieved, which in turn can be used effectively for power generation.

It may then be favorable if a first part of a generator device is rotated in the first rotor and a second part of a generator device is rotated in the second rotor. This results in high relative speeds for the effective generation of electricity.

The following description of preferred embodiments is used in conjunction with the drawings for further explanation of the invention. Show it:

1 an embodiment of a wind turbine in side view;

2 a schematic representation of an embodiment of a rotor with collecting device;

3 a plan view of the rotor according to 1 ;

4 a partial view of another embodiment of a rotor with collecting device;

5 (a) schematically the course of an air flow around a rotor blade with respect to a cross-sectional profile (line 5-5 according to 1 ) of the rotor blade;

5 (b) the flow path on the rotor blade according to 5 (a) when a guide means is disposed on the rotor blade;

6 an embodiment with a first rotor and a second rotor;

7 a further embodiment with a first rotor and a second rotor and an outer shell;

8th an embodiment with a first rotor and a second rotor and an intermediate louver;

9 a schematic sectional view of another embodiment with an outer sheath; and

10 a further embodiment with an outer sheath.

An embodiment of a wind turbine 10 ( 1 ) includes a mast or tower 12 , which is on a surface 14 is anchored. In the in 1 embodiment shown is the background 14 a floor. The ground can for example but also be a roof or the like.

At the mast 12 sits at a distance to the ground 14 a holding device 16 , The holding device 16 includes a storage facility 18 , on which (at least) one rotor 20 around a rotation axis 21 is rotatable (rotatable). The rotation axis 21 is oriented horizontally relative to the direction of gravity g, for example. It is transverse and in particular perpendicular to a height direction 22 aligned to the tower. The rotor 20 has a hub 24 on which a plurality of rotor blades 26 such as three rotor blades 26 is held. In one embodiment, the holding device is 16 around a rotation axis 28 rotatable, which parallel to the height direction 22 and transversely and in particular perpendicular to the axis of rotation 21 is. A rotational position about the axis of rotation 28 is detectable. This allows the rotor 20 align with a wind direction.

A rotor blade 26 has a profile leading edge 27 and a profile trailing edge 29 (see. 5 (a) ).

The holding device 16 is in particular on a housing 30 (Gondola) arranged. In the case 30 is in particular a generator device 32 arranged on which electrical power can be generated. Further, in the housing 30 a transmission device 34 arranged and in the housing 30 is a braking device 36 for braking a rotation of the rotor 20 arranged.

The rotor 20 may be a blade adjustment device 38 have, through which a position of a rotor blade 26 concerning the hub 24 is adjustable and in particular an angular position is adjustable.

In an embodiment which is shown schematically in the 2 and 3 is shown is the rotor 20 a collection device 40 assigned for air. The collecting device 40 is at the hub 24 arranged and arranged in particular in front of this. The collecting device 40 has, for example, a funnel 42 on, by which air in the area of the hub 24 is collectable. The funnel 42 is rotationally symmetrical with a (rotation) axis 44 , This rotation axis 44 in particular is coaxial with the axis of rotation 21 , The funnel 42 has a mouth opening 46 on, starting from which the funnel 42 rejuvenated.

The mouth opening 46 is in operation of the wind turbine 10 preferably in the wind direction 48 positioned.

The mouth opening 46 the collection device 40 especially lies in front of the rotor blades 26 relative to a direction along the axis of rotation 21 ,

At the rotor blades 26 is a leadership facility 50 designed for air, through which through the collecting device 40 collected air along the rotor blades 26 is feasible.

It is basically possible that each rotor blade 26 of the rotor 20 with a corresponding guide device 50 is provided or not all rotor blades 26 with the appropriate guide device 50 are provided.

The management device 50 is in fluidly effective communication with the collector 40 , Collected air can then be applied to the rotor blades 26 distribute and lead along this.

In one embodiment, a compressor device is 52 provided, which compresses collected air. This compressor device 52 is for example supplied with electric current, which by the generator device 32 is produced.

The compressor device 52 is for example at the collection facility 40 arranged.

In one embodiment, the collector is 40 rotatably with the rotor 20 connected. It is also possible that the collecting device 40 rotatably with the holding device 16 connected is. In this case, a transmission device is provided which ensures that collected Air the relatively rotating rotor blades 26 is supplied.

In one embodiment, the collector stands 40 also in fluid-effective connection with a channel device 54 , Through the channel device 54 is through the collecting device 40 collected air diverted and as cooling air, for example, the generator device 32 fed. The channel device 54 has one or more channels 56 on which a main flow direction parallel to the axis of rotation 21 provide. An appropriate channel 56 is for example on a shaft of the rotor 20 formed or aligned parallel to such a wave.

In one embodiment, the guide means comprises 50 (at least) one channel 58 which is in the corresponding rotor blade 26 is arranged, that is arranged in the interior thereof. The channel 58 extends along the corresponding rotor blade 26 , He has one or more Ausblaselemente 60 assigned by which air, which along the channel 58 was guided, is inflatable into the outside space.

The corresponding blow-out element 60 is arranged and formed in one embodiment, that a flow direction 62 ( 3 ) when blowing out a direction of rotation of the rotor 20 is opposite. This allows a recoil effect for the rotation of the rotor 20 to reach.

In particular, then a corresponding blow-out 60 on the rotor blade 26 near a peak 64 arranged. In particular, such a blow-out is 60 closer to the top 64 as to the hub 24 arranged. In particular, there is a distance between the blow-off element 60 and the top 64 at most 10% of a total length of the rotor blade 26 between the hub 24 and the top 64 ,

Alternatively or additionally, one or more blow-off elements 60 in a flow separation area of the rotor blade 26 arranged. This allows the detachment of a flow on an outer side of the rotor blade 26 influence positively. For example, this can cause a Störgrenzschichtausblasung to an internal flow at locations of external flow separation on the rotor blade 26 To blow out, so that they are on the profile of the rotor blade 26 applies and the flow resistance is reduced. This can achieve an increase in efficiency.

Due to the recoil effect over blow-off elements 60 it is also possible to use lower wind speeds. Even at lower startup speeds of the rotor 20 is an effective use possible.

In a further embodiment ( 4 ) is a rotor 66 provided, which in turn a collection device 40 (like reference numerals are used for like elements) which are in fluid communication with a guide means 68 on one or more rotor blades 70 of the rotor 66 stands. A leadership facility 68 includes at least one channel 72 which is on a surface 74 of the corresponding rotor blade 70 is arranged and along the rotor blade 70 runs. Such a channel 72 is open to an outside (in its longitudinal direction), ie is open to the outside. The corresponding channel 72 acts as a turbulator, which is a turbulent flow along the rotor blade 70 on the rotor blade 70 outside the canal 72 generated. It can also be on a channel 72 a turbulence generating device may be arranged, which comprises, for example, edge elements for turbulence promotion.

In particular, the width of a channel 72 in a width direction between the profile leading edge 27 and the profile trailing edge 29 of the rotor blade less than 10% of the width of the rotor blade 70 between the profile leading edge 27 and the profile trailing edge 29 , Preferably, the width of the channel 72 less than 5% and preferably less than 1% than the corresponding width of the rotor blade 70 ,

A channel 72 is in particular at the profile leading edge 27 arranged and runs along this on the rotor blade 70 , In 5 (a) schematically the flow pattern is shown on a rotor blade. At a transfer area 76 the laminar flow dissolves and turns into turbulent flow (in 5 (a) With 78 designated).

In the solution according to the invention ( 5 (b) ) there is an envelope in turbulent flow (indicated in 5 (b) by the reference numeral 79 ) earlier (ie closer to a profile leading edge 27 ) than in the example according to 5 (a) , This is done by the turbulator 72 causes. The turbulent flow is longer on the rotor blade 70 at; the detachment point 80 is in the direction of the profile trailing edge 29 postponed. It forms over a large width (between the profile leading edge 27 and profile trailing edge 29 ) and preferably over at least approximately the entire width of the corresponding rotor blade 70 a turbulent flow 82 out. The turbulent flow 82 So lies in the inventive solution with the guide device 68 longer than without guide device 68 with one or more channels 72 on a surface of the rotor blade 70 , This in turn leads to more buoyancy and the flow resistance is lower.

In the solution according to the invention is by the collector 40 Air collected and forwarded to the guide or the facility 50 respectively. 68 , (In one embodiment, guide means 50 and leadership facility 68 provided.) By blowing out collected air at blow-off elements 60 contrary to the direction of rotation can be the corresponding rotor 20 Give a recoil, so that even at low wind speeds, an increase in efficiency is possible.

Furthermore, can be made by blowing air to the blow-off 60 in a suitable area by guiding air in the open channels 72 influence a flow boundary layer such that the wall friction is reduced. By such a positive flow influencing can be on the corresponding rotor 20 respectively. 66 reduce the resulting noise. It can keep the material load lower. Furthermore, a flutter can be reduced. Even a disturbing turbulence development can be reduced.

Furthermore, an increase in efficiency can be achieved by a longer flow around.

By the inventive solution with a guide device 50 or guide device 68 Also, the static strength and stiffness of the corresponding rotor can be 20 . 66 increase. Furthermore, natural frequencies of the rotor blades can be 26 . 70 influence and in particular also influence such that they are outside of a disturbing area.

Depending on the application is a blow-out 60 an opening or is formed as a nozzle.

In a further embodiment of a wind turbine is a rotor device 84 ( 6 ), which has a first rotor 86 and a second rotor 88 includes. The first rotor 86 and the second rotor 88 each have a plurality of rotor blades.

The first rotor 86 is about a wave 90 around a rotation axis 92 rotatably mounted. The second rotor 88 is behind the first rotor 86 arranged and over a wave 94 around a rotation axis 96 rotatably mounted. The rotation axis 96 and the rotation axis 92 are coaxial with each other.

For example, the wave 94 an outer shaft or hollow shaft, in which the shaft 90 is guided.

The first rotor 86 is in rotationally fixed connection with a first part 98 a generator device 100 , The wave 94 is in rotationally fixed connection with a second part 102 the generator device 100 , The first part 98 and the second part 102 the generator device 100 are rotatable relative to each other, whereby electrical current is generated by this relative rotation (corresponding to the rotation between a generator stator and a generator rotor).

According to the invention, it is provided that the first rotor 86 and the second rotor 88 rotate in opposite directions, ie have opposite directions of rotation. This also rotates the first part 98 and the second part 102 in opposite directions.

It is possible that the first rotor 86 and / or the second rotor 88 a collecting device as described above according to the collecting device 40 assigned and that the first rotor 86 and / or the second rotor 88 with management facilities 50 and / or leadership facilities 68 are provided. It can also be provided that no additional air flow to the first rotor 86 and the second rotor 88 is provided.

By training with the first rotor 86 and the second rotor 88 Even small wind speeds can be used effectively.

At the in 6 the embodiment shown is the generator device 100 relative to a direction along the axis of rotation 92 behind the second rotor 88 arranged. It can also be provided that the generator device between the first rotor 86 and the second rotor 88 is arranged. This results in an effective mass balance.

In a further embodiment, a first rotor 104 and a second rotor 106 intended. These are arranged one behind the other with coaxial axes of rotation as described above. It is a generator device 108 provided, wherein a first part of the generator means rotatably connected to the first rotor 104 is connected and a second part of the generator means rotatably with the second rotor 106 connected is.

The corresponding rotor device 108 includes an outer jacket 110 , inside which the first rotor 104 and the second rotor 106 are arranged. An axis of symmetry of the outer jacket 110 falls in particular with a rotation axis 112 of the first rotor 104 and the second rotor 106 together.

In the embodiment shown, the outer jacket 110 a cylindrical outer shell, which along the axis of rotation 112 has a homogeneous cross-section.

Through the outer jacket 110 can the air flow for the air supply to the second rotor 106 influence.

It can also be provided as in 9 indicated that the first rotor 104 and the second rotor 106 an outer jacket 114 is assigned, within which the first rotor 104 and the second rotor 106 are located. This outer jacket 114 points from the first rotor 104 away to the second rotor 106 towards a tapered cross section.

In a further embodiment, which in 10 is shown is an outer jacket 116 provided, which of the first rotor 104 Away a rejuvenating area 118 (referring to a cross-section) and an area widening therewith 120 Has. At one point 122 between the first rotor 104 and the second rotor 106 has the outer jacket 116 a minimal cross-section. The outer jacket 116 This has the formation of an expansion nozzle with the tapered area 118 , a job 122 with the narrowest cross-section and an adjoining widening area 120 , This allows the second rotor 106 optimally supplying air.

In the embodiment according to the 6 and 7 have the first rotor 104 and the second rotor 106 the same diameter. In the embodiment according to 9 has the first rotor 104 a larger diameter than the second rotor 106 , In the embodiment according to 10 has the first rotor 104 a smaller diameter than the second rotor 106 ,

In a further embodiment, which is in 8th is indicated and a variant of the rotor device 84 where like numerals are used for like elements is between the first rotor 104 and the second rotor 106 a louver 124 arranged. This is in one embodiment rotatably with the shaft 90 Connected and thereby turns with this.

In one embodiment, the louver 124 no larger cross section than the first rotor 104 or the second rotor 106 on.

The louver has in particular a circular outer contour 126 , It includes, for example, a circular guide grid 128 ,

Through the louver 124 For example, air is supplied to the second rotor 106 swirled.

The arrangement according to 8th can also be combined with an outer jacket as described above. Furthermore, one or all rotors of the corresponding rotor device can be assigned a collecting device for air and corresponding guide devices.

According to the invention, a wind power plant is operated as follows:
The holding device 16 which the rotor 66 or the rotors 84 . 86 respectively. 104 . 106 stops, according to the wind direction 48 aligned.

This is also the mouth opening 46 the collection device 40 aligned accordingly. There air is collected and via the guide device 50 respectively. 68 on the rotor blades 26 distributed. At the management facilities 50 gets air inside the rotor blades 26 guided and in each case at one or more Ausblaselementen 60 blown out. As a result, a recoil is generated and / or a boundary layer flow is positively influenced.

In a leadership device 68 which acts in particular as a turbulator, is prevented by an early flow of laminar flow into turbulent flow early flow separation.

When the first rotor 84 . 104 and the second rotor 86 . 106 are provided, then these are rotated in opposite directions. This also turns the first part 98 and the second part 102 the generator device 100 in opposite directions.

The solutions according to the invention also make it possible to use low wind speeds in an optimized manner for generating electricity.

LIST OF REFERENCE NUMBERS

10

 Wind turbine

12

 mast

14

 underground

16

 holder

18

 Storage facility

20

 rotor

21

 axis of rotation

22

 Height extension direction

24

 hub

26

 rotor blade

27

 Leading edge

28

 axis of rotation

29

 Trailing edge

30

 casing

32

 generating means

34

 transmission device

36

 braking means

38

 Blade adjustment facility

40

 collecting device

42

 funnel

44

 axis of rotation

46

 mouth

48

 wind direction

50

 guide means

52

 compressor means

54

 passage means

56

 channel

58

 channel

60

 Discharge

62

 flow direction

64

 top

66

 rotor

68

 guide means

70

 rotor blade

72

 channel

74

 surface

76

 transfer area

78

 turbulent area

79

 envelope

80

 transfer area

82

 turbulent flow

84

 rotor means

86

 first rotor

88

 second rotor

90

 wave

92

 axis of rotation

94

 wave

96

 axis of rotation

98

 first part

100

 generating means

102

 second part

104

 first rotor

106

 second rotor

108

 rotor means

110

 outer sheath

112

 axis of rotation

114

 outer sheath

116

 outer sheath

118

 rejuvenating area

120

 expanding area

122

 Job

124

 Cowl

126

 outer contour

128

 guide grid

Claims (30)

Wind turbine, comprising at least one rotor ( 20 ; 66 ; 104 . 106 ) with rotor blades ( 26 ; 70 ), which is rotatably mounted, a collecting device ( 40 ), through which air can be collected, and a guide device ( 50 ; 68 ), which on a rotor blade ( 26 ; 70 ) in fluidly operative connection with the collecting device ( 40 ) and by which air along the corresponding rotor blade ( 26 ; 70 ) is feasible. Wind power plant according to claim 1, characterized in that the collecting device ( 40 ) on a hub ( 24 ) and / or in front of a hub ( 24 ) of the rotor ( 20 ; 66 ; 104 . 106 ) is arranged. Wind power plant according to claim 1 or 2, characterized in that the collecting device ( 40 ) rotatably with the at least one rotor ( 20 ; 66 ; 104 . 106 ) or rotationally fixed relative to a holding device ( 16 ) at which the at least one rotor ( 20 ; 66 ; 104 . 106 ) is rotatably mounted. Wind turbine according to one of the preceding claims, characterized in that the collecting device ( 40 ) one or more funnels ( 42 ). Wind turbine according to one of the preceding claims, characterized in that an axis of the collecting device ( 40 ) parallel and in particular coaxial with a rotation axis ( 21 ) of the at least one rotor ( 20 ; 66 ; 104 . 106 ) is oriented. Wind turbine according to one of the preceding claims, characterized in that a duct device ( 54 ) in fluidly effective communication with the collecting device ( 40 ), the channel device ( 54 ) Cooling air of a transmission device ( 34 ) and / or braking device ( 36 ) and / or generator device ( 32 ) feeds. Wind turbine according to one of the preceding claims, characterized in that the collecting device ( 40 ) and / or the management facility ( 50 ; 68 ) a compressor device ( 52 ) assigned. Wind turbine according to one of the preceding claims, characterized in that the guide device ( 50 ) one or more channels ( 58 ), which in the rotor blade ( 26 ) are arranged. Wind turbine according to claim 8, characterized in that the channel (s) ( 58 ) at least one blow-out element ( 60 ) is assigned by the air on the rotor blade ( 26 ) is inflatable. Wind turbine according to claim 9, characterized in that the at least one blow-out element ( 60 ) is arranged and designed such that a blow-out direction ( 62 ) counter to a direction of rotation of the at least one rotor ( 20 ). Wind turbine according to claim 9 or 10, characterized in that the at least one blow-out element ( 60 ) is arranged and formed so that air at a flow separation region on the rotor blade ( 26 ) is inflatable. Wind power plant according to one of claims 9 to 11, characterized in that the at least one blow-out element ( 60 ) closer to a peak ( 64 ) of the rotor blade ( 26 ) is arranged as one Hub ( 24 ) and in particular a distance of the at least one blow-off element ( 60 ) to the top ( 64 ) not more than 10% of a total length of the rotor blade ( 26 ) between the hub ( 24 ) and the top ( 64 ) is. Wind turbine according to one of the preceding claims, characterized in that the guide device ( 68 ) one or more channels ( 72 ), which on a surface ( 74 ) of the rotor blade ( 70 ) are arranged and in particular are open to an outside. Wind turbine according to claim 13, characterized in that the one or more channels ( 72 ) are designed as turbulators and / or are provided with a turbulence-generating device. Wind power plant according to claim 13 or 14, characterized in that the one or more channels ( 72 ) have a width which is at most 10% and in particular at most 5% and in particular at most 1% of a width of the rotor blade ( 70 ) between a profile leading edge ( 27 ) and a profile trailing edge ( 29 ) is. Wind turbine according to one of the preceding claims, characterized by a plurality of successively arranged rotors ( 86 . 88 ; 104 . 106 ), in particular with coaxial axes of rotation ( 92 . 96 ). Wind power plant according to claim 16, characterized by at least one first rotor ( 86 ; 104 ) and a second rotor ( 88 ; 106 ), which are in opposite directions. Wind power plant according to claim 17, characterized in that the first part ( 98 ) a generator device ( 100 ) rotatably with the first rotor ( 86 ; 104 ) and a second part ( 102 ) of the generator device ( 100 ) rotatably with the second rotor ( 88 ; 106 ), wherein by rotation of the first part ( 98 ) and / or the second part ( 102 ) Electric power can be generated. Wind power plant according to claim 17 or 18, characterized in that the generator device ( 100 ) between the first rotor ( 104 ) and the second rotor ( 106 ) is arranged. Wind power plant according to one of claims 17 to 19, characterized in that the first rotor ( 104 ) and the second rotor ( 106 ) an outer jacket ( 110 ; 114 ; 116 ) within which the first rotor ( 104 ) and the second rotor ( 106 ) are arranged, in particular the outer shell ( 110 ; 114 ; 116 ) coaxial with a rotation axis ( 92 ; 96 ) of the first rotor ( 104 ) and / or second rotor ( 106 ) is arranged. Wind power plant according to claim 20, characterized in that the outer jacket ( 110 ; 114 ; 116 ) has at least one region which has a constant cross section and / or from the hub ( 24 ) has a tapered cross section and / or from the hub ( 24 ) has a widening cross section. Wind power plant according to claim 21, characterized in that the outer casing ( 116 ) is designed as an expansion nozzle with a tapered area ( 118 ) on which an expanding area ( 120 ) follows. Wind turbine according to one of claims 17 to 22, characterized in that the first rotor ( 84 ; 104 ) and the second rotor ( 86 ; 106 ) have a same diameter or have different diameters. Wind turbine according to one of claims 17 to 23, characterized in that between the first rotor ( 104 ) and the second rotor ( 106 ) an air guiding device ( 124 ) is arranged. Wind power plant according to claim 24, characterized in that the air guiding device ( 124 ) a guide grid ( 118 ), which in particular has a circular outer contour. A method of operating a wind turbine, wherein in the region of a hub of at least one rotor air is collected and the collected air is guided along a rotor blade in the rotor blade and / or on an outer side of the rotor blade. A method according to claim 26, characterized in that in the rotor blade guided air is blown in a direction opposite to a rotational direction of the rotor on the rotor blade. A method according to claim 26 or 27, characterized in that air is blown out at a flow separation area on the rotor blade. Method according to one of claims 26 to 28, characterized in that at least one first rotor and a second rotor, which are arranged one behind the other, are rotated in opposite directions to each other. A method according to claim 29, characterized in that with the first rotor, a first part of a generator device is rotated and with the second rotor, a second part of a generator device is rotated.

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