DE102019125467A1 - Aircraft wind power plant - Google Patents

Abstract

The invention relates to an airborne wind power plant (10) with a “lighter-than-air” lifting body (13), wind rotor (11) in a wind tunnel (12), generator (31), tether (27). According to the invention, a solid structure is provided for forming the wind tunnel (12) and for receiving the wind rotor (11).

Description

The invention relates to an airborne wind power plant, with a “lighter-than-air” lifting body, a wind rotor in a wind tunnel, a generator and a tether.

Aircraft wind power plants of the type mentioned are from the EP 2 344 756 B1 and US 2014/0377066 A1 known. In both cases, a wind rotor is arranged in a wind tunnel. The wind tunnel is part of a float filled with light gas. The gas-filled float is connected to a ground station via a tether. The wind tunnel is designed to be relatively unstable, as is the anchoring of the wind rotor.

The DE 10 2007 020 632 A1 discloses an annular balloon with a strut supported rotor.

The WO 2010/006433 A1 discloses a zeppelin-like balloon with rotors on the outside of the wing tips.

The object of the present invention is to create an airborne wind power plant of the type mentioned, which is particularly suitable for stronger winds.

To achieve the object, the airborne wind power plant according to the invention has the features of claim 1. In particular, a solid structure is provided for forming the wind tunnel and for receiving the wind rotor. The solid structure can be a frame, a frame, a grid, a body with solid walls. It is important that the solid structure guarantees a rigid, permanently constant shape of the wind tunnel under all operating conditions permissible with regard to static and dynamic loads, as well as an exact and unchangeable positioning of the wind rotor in the wind tunnel. In the simplest case, the wind tunnel is essentially a pipe with a rigid wall. However, it is also possible to have a fixed grid or frame with a cover or film that is less rigid than the surface or covering.

The float is intended to be filled with hydrogen or filled with hydrogen. It is also possible to fill it with other gases that are lighter than air. The volume of the float in relation to the total mass of the aircraft wind power plant must then be adapted to the light gas used. The buoyancy body preferably extends annularly around the fixed structure. The buoyancy body should in particular have a flexible, resilient shell as a wall. An additional shaping support structure for the buoyancy body, for example a framework or a frame, is also possible.

According to a further concept of the invention, the wind tunnel can be tubular with a round cross-section and with a subsequent diffuser. The wind tunnel can predominantly or exclusively have a circular cross section. The adjoining diffuser has a cross section that increases in the wind direction (flow direction), in particular with a progressively increasing diameter in the flow direction, similar to an outlet opening on a trumpet or tuba. In a longitudinal section of the diffuser, this results in a convex contour on the inside. The energy yield of the wind rotor can be increased through the diffuser. The diffuser is preferably part of the solid structure.

According to a further concept of the invention, the wind tunnel can have an inlet opening with a screen for changing the cross section. The air inlet into the wind tunnel can be regulated by means of the cover. It is even possible to use a screen that completely closes the inlet opening.

According to a further concept of the invention, the diaphragm can be designed as an iris diaphragm. This is understood to mean a diaphragm analogous to an optical diaphragm, i.e. a diaphragm with a variable opening width, the opening of which can be changed with a fixed center point so that it remains approximately circular. “Approximately” because iris diaphragms used in optics are provided along a circumference arranged lamellae which can be moved relative to the center point. The slats are angled relative to each other. The more lamellas there are, the closer the shape of the opening is to the circular shape.

According to a further concept of the invention, a tail unit can be provided as a rudder, the tail unit being connected to the fixed structure. The tail unit is based on the fixed structure and extends in particular in a vertical, that is, upright direction, based on a desired flight position of the airborne wind power plant. However, several tail units angled against one another can also be provided as rudders. With the tail unit it is possible to set a stable flight attitude so that undesired rotations around a vertical axis or deviations from a desired flight attitude are avoided. The tail unit itself is preferably of a solid structure.

According to a further idea of the invention, the tail unit can penetrate the buoyancy body. The tail unit then extends through the float. Thus, despite the tail unit, the buoyancy body can surround the solid structure.

According to a further concept of the invention, adjustable airfoils for dynamic lift can be arranged on both sides of the fixed structure, the airfoils being connected to the fixed structure. In particular, the wings proceed from the solid structure in a common plane in a horizontal orientation. Due to the dynamic lift, the airborne wind power plant remains at a great height even in strong winds. The dynamic lift can be adjusted via the adjustable wings, in particular to adapt to the wind strength and the angle of the tether. The wings themselves are preferably of solid structure. The airfoils preferably extend through the buoyancy body and so penetrate it.

According to a further concept of the invention, the buoyancy body can be divided into closed segments which together form the buoyancy body and are in particular connected to one another for this purpose. The segments should be individually replaceable and fillable with the light gas. Segments that are preferably adjacent to one another can be connected to one another on the outside and / or via gas lines. In addition, transitions between individual segments can be covered windproof. The segments are preferably attached to the fixed structure, in particular to the wind tunnel and / or to the diffuser.

Gas hoses advantageously lead from the segments to the solid structure. Control valves for individual filling and emptying of the segments are preferably provided there. The control valves can be connected to a central gas line which leads along the tether to the ground.

According to a further concept of the invention, the segments can connect to one another around the fixed structure and thus form a ring around the fixed structure. Parting planes between the segments extend in particular parallel to the direction of flow or to an axis of the ring.

According to a further concept of the invention, the segments can each have an at least partially bi-convex or elliptical contour in a longitudinal section along the direction of flow. As a result, the segments can be adapted as best as possible to an outer contour of the wind tunnel with diffuser and at the same time form a stable shape, preferably with regard to a gas pressure inside the segments and a wind pressure acting on the segments from outside.

According to a further concept of the invention, the generator can be a ring generator with an annular rotor. Ring generators are known from, for example WO 2011/002979 A2 , DE 102 08 588 A1 and DE 10 2008 050 848 A1 . In particular, the ring generator is permanently excited. Due to the design as a ring generator, the rotor of the generator, that is to say the electric or magnetic rotor, is not in the wind tunnel but outside it, as is a stator of the generator.

According to a further concept of the invention, the wind rotor can have rotor blades, the radially outer ends of which are mounted in the rotor of the ring generator. This means that a central shaft and a central bearing for the wind rotor can be dispensed with. The wind rotor preferably has three rotor blades.

According to a further concept of the invention, the rotor of the generator can be magnetically supported. This means that there is no mechanical friction. Magnetic bearing ring generators are known from the DE 10 2017 106 434 A1 and from feasibility studies by the Fraunhofer Institute, see (accessed on August 29, 2019) https://doi.org/10.2314/gbv:804429278 and https://doi.org/10.2314/gbv:89712684x.

According to a further concept of the invention, the wind rotor can be arranged in the direction of flow just behind a smallest cross section of the diffuser, namely between the smallest cross section and 5-25% of the length in the direction of an outlet of the diffuser. The wind rotor is preferably arranged between 10% and 20% of the length in the direction of the outlet of the diffuser, starting from the smallest cross section. This leaves 80-90% of the length of the diffuser up to the outlet. The flow in the wind tunnel is thus optimally used.

According to a further concept of the invention, the wind rotor can be mounted radially in the center of the wind tunnel and held on struts. Alternatively or additionally, the generator can be arranged radially in the center.

According to a further concept of the invention, at least one electrical consumer can be arranged on the tether, in particular an antenna, a lamp or both. The electrical consumer is therefore a payload that is not required for the function of the aircraft wind power plant. A cellular radio antenna or directional radio antenna is preferably provided as the antenna.

• - Stromkabel für Strom des Generators zu einer Bodenstation,
• - Stromkabel für Strom des Generators zu einem elektrischen Verbraucher an der Halteleine,
• - Stromkabel für Strom von einer Bodenstation zu einem elektrischen Verbraucher an der Halteleine,
• - Datenkabel für elektrische Verbraucher an der Halteleine,
• - Datenkabel für eine Steuerung des Flugwindkraftwerks,
• - Schlauch für die Zufuhr von Wasserstoff zum Auftriebskörper.

According to a further concept of the invention, lines can be attached to the tether, namely at least one of the following lines:

• - Power cable for power from the generator to a ground station,
• - Power cable for power from the generator to an electrical consumer on the tether,
• - Power cable for power from a ground station to an electrical consumer on the mooring line,
• - Data cable for electrical consumers on the mooring line,
• - data cable for a control of the aircraft wind power plant,
• - Hose for the supply of hydrogen to the float.

A holding line is basically any flexible and retrievable connection between the aircraft wind power plant and a ground station, in particular a rope, a cable, a hose or a combination of the same or different components mentioned.

According to a further concept of the invention, a ground station with an anchorage for the tether can be provided. The anchorage or ground station is preferably provided with a foundation or foundation in order to absorb the tensile forces occurring by the airborne wind power plant and to direct them into the ground. The ground station can be located on land or on the sea floor. A floating ground station with anchoring in the seabed is also possible.

According to a further concept of the invention, a winding device can be provided for the tether, in particular also for lines on the tether. The winding device is preferably connected to the ground station or the anchorage.

According to a further concept of the invention, the ground station can be connected to a gas store, in particular for hydrogen. The light gas is stored in the gas storage tank and can be fed from there to the aircraft wind power plant via a pipe.

According to a further concept of the invention, gas storage, electrolyzer, fuel cell and / or battery can be provided. In particular, these devices are connected to the ground station or are arranged close to or in the ground station. The electricity generated by the aircraft wind power plant can be used to split water into hydrogen and oxygen by electrolytic means. The hydrogen can be stored under pressure in the gas storage tank and / or fed into the buoyancy body via a line. Additionally or alternatively, the current can be stored in a battery and / or used to supply a consumer. The consumer is preferably held on the tether or on the fixed structure. The stored hydrogen can be used together with atmospheric oxygen to generate electricity in the fuel cell, which is fed into the general electricity grid or stored in the battery. The electricity generated by the generator is preferably fed directly into the power grid.

• 1 ein Flugwindkraftwerk an einer Halteleine über einer Bodenstation,
• 2 das Flugwindkraftwerk in einer horizontalen Schnittansicht von oben, mit einer Schnittebene unmittelbar oberhalb von Tragflächen,
• 3 das Flugwindkraftwerk in einer Seitenansicht,
• 4 das Flugwindkraftwerk in einer Frontansicht mit Einlassöffnung,
• 5 eine feste Struktur des Windkraftwerks in perspektivischer Darstellung und mit sichtbarer Auslassöffnung,
• 6 die feste Struktur in einer Schnittansicht analog 2 und mit einer alternativen Ausführung eines Windrotors.

Further features of the invention can also be found in the description and in the claims. Advantageous embodiments of the invention are explained in more detail below with reference to drawings. Show it:

• 1 an aircraft wind power plant on a tether above a ground station,
• 2 the airborne wind power plant in a horizontal sectional view from above, with a sectional plane directly above the wings,
• 3rd the aircraft wind power plant in a side view,
• 4th the aircraft wind power plant in a front view with inlet opening,
• 5 a solid structure of the wind power plant in perspective and with a visible outlet opening,
• 6th the solid structure in a sectional view analogously 2 and with an alternative design of a wind rotor.

As in 1 recognizable, shows an airborne wind power plant 10 a wind rotor 11 in a wind tunnel 12th as well as one around the wind tunnel 12th ring-shaped circumferential float 13th on. The particularly balloon-like flexible float 13th consists of individual segments here 14th , which are designed the same or almost the same and in the circumferential direction of the wind tunnel 12th successive. Parting lines 15th between the segments 14th preferably extend parallel to one through an arrow 16 specified flow direction. The direction of flow should denote the direction of the wind and is correct if the airborne wind power plant is aligned accordingly 10 with a longitudinal axis 17th of the wind tunnel 12th match. The longitudinal axis 17th is preferably also the axis of rotation of the wind rotor 11 , please refer 2 .

The wind tunnel 12th is tubular, in particular with a circular, constant cross-section, that is to say cylindrical, and in the area of an inlet opening 18th with an iris diaphragm 19th Mistake. With the iris diaphragm 19th can be the effective cross section of the inlet opening 18th can be changed, in particular also completely closed and so on the wind rotor 11 accurate air flow regulate. In particular, the effective cross-section is reduced when the wind increases. This allows the aircraft wind power plant 10 can continue to be operated without being switched off even at higher wind speeds.

To the wind tunnel 12th a diffuser closes directly in the direction of flow 20th at. Its smallest cross section corresponds to the cross section of the wind tunnel 12th . Towards its outlet port 21 the diameter of the diffuser increases 20th disproportionately, so exponentially, so that the shape of the diffuser 20th in the area of the outlet opening 21 corresponds to an air outlet of a trumpet or tuba. That is, the diameter of the diffuser 20th increases progressively in the direction of flow. From inside the diffuser 20th seen from has a circumferential diffuser wall 22nd a convex shape in section, see in particular 2 and 6th .

The diffuser 20th and in particular its described shape, provide for an increased yield of kinetic energy from the wind tunnel 12th pouring wind. The diameter of the outlet opening 21 is about twice the diameter of the inlet opening 18th . In the direction of flow, the diffuser is approximately the same length as the wind tunnel.

The combination of a wind tunnel 12th and diffuser 20th forms the core of a solid structure to accommodate the wind rotor 11 . The solid structure is made of light but stable materials such as aluminum or carbon. The solid structure is inherently stiff, in contrast to a flexible balloon envelope.

An upright rudder unit is connected to the fixed structure 23 and wings arranged on both sides 24 . Vertical stabilizer 23 and wings 24 are also made stiff or solid, made of light but stable materials and firmly attached to the wind tunnel 12th connected.

The vertical stabilizer 23 consists of a fixed part of the body facing the wind direction 25th and a movable part body facing away from the wind direction 26th . Here is the part of the body 26th preferably on the part of the body 25th articulated and pivotable about a vertical axis. With the movable part of the body 26th can the aviation wind power plant 10 be maneuvered around a vertical axis. It is also possible to return to an initial orientation by rotating the aircraft wind power plant several times 10 around the vertical axis and thus a twisting of a tether 27 to avoid cables or hoses.

The wings 24 are profiled to create dynamic buoyancy. An angle of attack of the wings 24 to the wind is adjustable in order to increase the dynamic lift at higher wind speeds. At high wind speeds, this can mean that the dynamic lift is far greater than the static lift of the float 13th so that the aircraft wind power plant 10 is not pressed to the ground, but with a maximum deflection of 30 ° perpendicular to an anchorage 28 is in the air.

As stated above, the float extends 13th ring-shaped around the solid or rigid structure made of wind tunnel 12th with diffuser 20th . Vertical stabilizer 23 and wings 24 extend through the float 13th through. Preferably the segments are 14th arranged so that the rudder unit 23 and the wings 24 in the area of parting lines 15th between the segments 14th lie. A special design of the segments that are flexible, in particular balloon-like 14th for adaptation to vertical tail unit 23 and wings 24 is therefore not necessary or only necessary to a limited extent.

The moving part of the body 26th of the vertical stabilizer 23 stands in the radial direction outwards over the float 13th and is therefore significantly shorter overall than the part of the body 25th , see in particular 5 . The wings 24 are subdivided into a fixed profile located radially on the inside 29 and a movable profile adjoining it radially on the outside 30th . Only the moving profile 30th stands outwards over the float 13th above. The fixed profile 29 lies between the segments 14th and is normally not visible.

The volume of the float 13th is chosen so that the static lift of the airborne wind power plant is high enough to power the airborne wind power plant 10 who have favourited the tether 27 , to carry additional cables and hoses as well as one or more payloads and to generate enough lift in weak winds for the aircraft wind power plant 10 is not pushed towards the ground. As a light gas for filling the float 13th hydrogen is preferably provided.

The wind rotor 11 is with an electric generator 31 coupled, which here in the execution according to 2 a ring generator with magnetic bearings 32 , annular stator 33 and permanently excited rotor 34 is. The wind rotor 11 has three rotor blades here 35 on that radially outward with the annular rotor 34 of the generator 31 are connected. That is why the wind rotor needs 11 no central shaft and no central bearing either. The storage of the wind rotor 11 takes place only indirectly through the connection with the rotor 34 of the generator. Correspondingly are in the wind tunnel 12th or diffuser 20th no elements for mounting the wind rotor that interfere with the wind power 11 available.

The generator 31 is on the outer circumference of the diffuser 20th provided, close to the wind tunnel 12th . Preferably the wind rotor 11 , starting from the wind tunnel 12th , at about 10-20% of the length of the diffuser 20th arranged. That is, from the wind rotor 11 up to the outlet opening 21 This leaves about 80-90% of the length of the diffuser 20th .

One in proportion to 2 different embodiment shows 6th . The float 13th is not drawn but available. Deviating from 2 is the wind rotor 11 with a central bearing 36 Mistake. The warehouse 36 is in the diffuser 20th on struts 37 held, but can also be done in the wind tunnel 12th or in both (wind tunnel 12th and diffuser 20th ) be held. Here, too, are the rotor blades 35 with the rotor 34 of the generator 31 (as a ring generator) connected.

The tether 27 is preferably with the wind tunnel 12th connected, see 5 . In addition, a load distribution and / or stabilization effecting lines can be used 38 from a point of articulation 39 to the float 13th be provided. In doing so, the lines form 38 a rope spider, see 1 , 3rd and 4th .

As stated above, the mooring line is 27 in an anchorage 28 held on the ground. The anchorage 28 can one in the ground 40 be embedded foundation. On the mooring 28 is a winch 41 provided with the tether 27 can be retracted and extended. In addition to the anchoring 28 is a ground station 42 with a mains connection 43 intended. The foundation of the anchorage 28 can be cast from reinforced concrete or from easily transportable concrete blocks or other weights that are buried in the ground 40 are anchored. When using individual weights, it is also possible to simply dismantle and move the entire system to other locations. The anchorage 28 only needs the pulling power of the aircraft wind power plant 10 on the mooring line 27 and do not absorb any levering forces of a tower.

In the ground station 42 there may be an electrolyser with which hydrogen can be generated from water and electricity. With this hydrogen the hydrogen in the float can 13th can be refilled using a pump. In addition, excess electricity can be stored in the form of hydrogen when the electricity demand is low. A pressure vessel with a pump can be used to store the hydrogen. In addition, a water storage tank can be provided at the ground station for the generation of the hydrogen by electrolysis, which is either manually at regular intervals or via the surface of the airborne wind power plant 10 collected and over the mooring line 27 drained water is filled.

Excess electrical power can also be stored in a power storage battery and used for the emergency power supply of the aircraft wind power plant, for cushioning load peaks in the network or for generating hydrogen via the electrolyser. A fuel cell can also be used to convert the hydrogen stored in the pressure accumulator into electrical power to cushion load peaks in the network. In the ground station 42 can also be a control of the aircraft wind power plant 10 as well as converters, inverters and the grid connection 43 .

In the mooring line 27 Power cables for the power of the generator can be integrated or connected to this 31 to the ground station 42 , Power cable from the ground station 42 for electrical consumers on the mooring line 27 , Data cable for the electrical consumers and the control of the aircraft wind power plant 10 and / or a hose for hydrogen transport. You can also use the tether 27 and all of the aforementioned cables and hoses are bundled and surrounded by a protective sheath in order to achieve better aerodynamic properties and to prevent the individual components from swinging up in the wind.

Along the entire length of the mooring line 27 different payloads can be arranged and operated, like cell phone antennas 44 , Directional antennas 45 and other antennas, lamps or lights 46 . In the case of payloads that require constant alignment with a target, such as cellular radio antennas and directional radio antennas, the payload can be automatically tracked by motors (not shown) for rotation around the tether 27 and to change the inclination to the ground possible. Due to the great height of the airborne wind power plant 10 A cellular antenna can cover a much larger area above the ground, even on uneven terrain. A cellular antenna on an aircraft wind power plant is therefore well suited as a replacement for several radio masts in sparsely populated areas or on railway lines and motorways.

The winds 41 is with separate drums 47 for winding up the tether 27 and the other cables and hoses. About the mooring line 27 also finds the dissipation of electrostatic charge and lightning strikes in the aircraft wind power plant 10 about the foundation of the anchorage 28 instead of.

Over the winch 41 can be a support frame for the aircraft wind power plant 10 be arranged on which the aircraft wind power plant 10 can be turned off for easy maintenance.

The one with the tether 27 connected hose for the transportation of light gas from the ground station 42 to the aircraft wind power plant 10 preferably leads up close to the solid structure of the wind tunnel 12th and diffuser 20th approach. From there there are connection hoses to each segment 14th intended. Each segment has its own valve. The valves can be designed in such a way that pressure equalization is also possible during heating and cooling, with hydrogen being let off or pumped out at excess pressure and hydrogen being supplied if the pressure is too low.

The segments 14th are particularly attached to the solid structure made of wind tunnel 12th and diffuser 20th attached and / or on their respective adjacent segments. The transitions between the segments 14th are preferably covered to reduce drag. The complete outer skin of the float 13th can be used as a huge advertising space or designed as inconspicuously as possible in order to change the landscape as little as possible. The individual segments 14th have a balloon envelope or a similar material and are preferably metal-coated so that as little hydrogen as possible diffuses. The individual segments have a bi-convex contour in the longitudinal section, that is to say in the direction of flow, see in particular 2 .

Preferably form wind tunnel 12th , Diffuser 20th , Vertical tail 23 , Wings 24 and fixed part of the generator 31 a solid structure with a permanently constant shape, while the float 13th or its segments 14th have a balloon-like envelope.

Adjustment mechanisms for the moving parts of the aircraft wind power plant, especially for the tail unit 23 and wings 24 as well as control valves for the gas supply and the filling of the float 13th are known elements and not shown, as is an electronic control unit. The latter can be used in the aircraft wind power plant 10 or at the ground station 42 be provided. A division with control units in the aircraft wind power plant and at the ground station is also possible 42 .

The airborne wind power plant is preferably dimensioned in such a way that it generates several hundred kilowatts to several megawatts of power permanently and regardless of the weather at heights of a few hundred to a thousand meters above the ground. Due to its great height above the ground, the airborne wind power plant is also suitable for use inland at locations that cannot be operated economically with conventional wind power plants close to the ground.

List of reference symbols

10

Aircraft wind power plant

11

Wind rotor

12th

Wind tunnel

13th

Floats

14th

Segments

15th

Parting lines

16

Arrow (direction of flow)

17th

Longitudinal axis

18th

Inlet opening

19th

Iris diaphragm

20th

Diffuser

21st

Outlet opening

22nd

contour

23

Vertical stabilizer

24

Wings

25th

fixed part body

26th

movable part of the body

27

Tether

28

anchoring

29

Fixed profile

30th

movable profile

31

generator

32

Magnetic bearing

33

stator

34

Generator rotor

35

Rotor blades

36

camp

37

Bracing

38

linen

39

Pivot point

40

ground

41

Winch

42

Ground station

43

Mains connection

44

Cellular antenna

45

Directional antenna

46

to shine

47

drums

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• EP 2344756 B1 [0002]
• US 2014/0377066 A1 [0002]
• DE 102007020632 A1 [0003]
• WO 2010/006433 A1 [0004]
• WO 2011/002979 A2 [0018]
• DE 10208588 A1 [0018]
• DE 102008050848 A1 [0018]
• DE 102017106434 A1 [0020]

Claims (20)

Airborne wind power plant (10) with “lighter-than-air” buoyancy (13), wind rotor (11) in a wind tunnel (12), generator (31), tether (27), characterized by a solid structure to form the wind tunnel (12) ) and to accommodate the wind rotor (11). Aircraft wind power plant after Claim 1 , characterized in that the wind tunnel (12) is tubular with a round cross-section and with a subsequent diffuser (20). Aircraft wind power plant after Claim 1 or 2 , characterized in that the wind tunnel (12) has an inlet opening (18) with a diaphragm (19) for changing the cross section. Aircraft wind power plant after Claim 3 , characterized in that the diaphragm (19) is an iris diaphragm. Aircraft wind power plant according to one of the Claims 1 to 4th , characterized by a tail unit (23) as a rudder, the tail unit (23) being connected to the fixed structure and preferably penetrating the buoyancy body (13). Aircraft wind power plant according to one of the Claims 1 to 5 , characterized by adjustable support surfaces (24) arranged on both sides of the fixed structure for dynamic lift, the support surfaces (24) being connected to the fixed structure and preferably penetrating the buoyancy body (13). Aircraft wind power plant according to one of the Claims 1 to 6th , characterized in that the buoyancy body (13) is divided into closed segments (14) which together form the buoyancy body (13) and for this purpose are in particular connected to one another. Aircraft wind power plant after Claim 7 , characterized in that the segments (14) adjoin one another around the fixed structure and thus form a ring around the fixed structure. Aircraft wind power plant after Claim 7 or 8th , characterized in that the segments (14) each have an at least partially bi-convex or elliptical contour in a longitudinal section along a flow direction (arrow 16). Aircraft wind power plant according to one of the Claims 1 to 9 , characterized in that the generator (31) is a ring generator with an annular rotor (34). Aircraft wind power plant after Claim 10 , characterized in that the wind rotor (11) has rotor blades (35), the radially outer ends of which are mounted in the rotor (34) of the ring generator (31). Aircraft wind power plant after Claim 10 or 11 , characterized in that the rotor (34) of the generator (31) is magnetically supported. Aircraft wind power plant according to one of the Claims 1 to 12th , characterized in that the wind rotor (11) is arranged in the flow direction (arrow 16) just behind a smallest cross section of a diffuser (20), namely between the smallest cross section and 5-25% of the length in the direction of an outlet (21) of the Diffuser (20). Aircraft wind power plant according to one of the Claims 1 to 13th , characterized in that the wind rotor (11) is mounted radially in the center of the wind tunnel (12) and is held on struts (37). Aircraft wind power plant according to one of the Claims 1 to 14th , characterized by at least one electrical consumer arranged on the tether (27), in particular - an antenna (44, 45), - a lamp (46). Aircraft wind power plant according to one of the Claims 1 to 15th , characterized by lines attached to the tether (27), namely: - power cable for power from the generator (31) to a ground station (42), - power cable for power from the generator (31) to an electrical consumer (44, 45, 46) on the tether (27), - power cable for electricity from a ground station (42) to an electrical consumer (44, 45, 46) on the tether (27), - data cable for electrical consumers (44, 45, 46) on the tether (27), - data cable for a control of the aircraft wind power plant (10), - hose for the supply of hydrogen to the float (13). Aircraft wind power plant according to one of the Claims 1 to 16 , characterized by a ground station (42) with anchoring (28) for the tether (27). Aircraft wind power plant after Claim 17 , characterized by a winding device (41) for the tether (27) and for lines on the tether (27). Aircraft wind power plant after Claim 17 or 18th , characterized in that the ground station (42) is connected to a gas storage device, preferably for hydrogen. Aircraft wind power plant according to one of the Claims 1 to 19th , characterized by gas storage, electrolyser, fuel cell and / or battery.

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