EP2683939A2

EP2683939A2 - Rotor arrangement for an axial turbine and a method for mounting same

Info

Publication number: EP2683939A2
Application number: EP12710136.8A
Authority: EP
Inventors: Patrick Hennes; Alexander Sauer
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2011-03-10
Filing date: 2012-03-08
Publication date: 2014-01-15
Also published as: DE102011013547A1; JP2014507599A; WO2012119771A3; KR20140061302A; US20130302169A1; WO2012119771A8; WO2012119771A2; CA2825235A1

Abstract

The invention relates to a rotor arrangement which comprises a drive shaft with a corresponding rotational axis that defines an axial direction and a circumferential direction; a rotor with a plurality of rotor blades each of which comprises a profiled rotor blade section able to be impinged on in an axial direction, and a blade-securing section; and each blade-securing section comprising a first contact region and a second contact region, the first contact region being supported on the blade-securing section of a first adjacent rotor blade and the second contact region being supported on the blade-securing section of a second adjacent rotor blade, at least indirectly. The invention is characterised in that the blade-securing sections are secured to the drive shaft in a form-fitting manner and/or by means of a screw connection, such that a connection between the rotor blade and the drive shaft is formed on a blade-securing section axial end-face which lies opposite an axial end surface on the drive shaft when in an assembly position; and the junction between the profiled rotor blade section and the blade-securing section on each rotor blade having a constriction-free outer contour.

Description

Rotor arrangement for an axial turbine and method for its assembly

The invention relates to a rotor assembly for an axial turbine, in particular with a propeller-shaped rotor for a tidal power station or a

Wind turbine with horizontal axis of rotation, as well as a method for their assembly.

Tidal power plants with a horizontally oriented drive shaft revolving on a nacelle, driven by a propeller-shaped turbine, are known and correspond to the design of wind turbines in

Horizontal rotor design. For tidal power plants are the rotors

Generic axial turbines either designed as free-flow units or of a jacket with a Venturi geometry for

Flow acceleration cases. The following described

Rotor arrangement can be further transferred to other axial flow machines, such as fans.

For efficient energy utilization of slow water currents, such as

continuous ocean currents or tidal currents

large-sized rotors needed. Corresponding requirements arise in the field of wind power, especially for offshore installations. This results in high forces and moments on the area of the rotor blade connection to the hub, which is in rotationally rigid connection to the drive shaft. Accordingly, for tidal power plants, the highly loaded components for rotor blade connection must be designed with a sufficient safety margin, since the by

Moonstep conditional cyclic fluctuations of the tidal current are heavily overlaid by weather conditions. Thus, depending on the swell, the wind direction and the present relief on the river bottom for the respective plant location strong, meteorologically influenced currents occur, which lead to a fluctuating load on the rotor. Furthermore, a simplified system concept with rigidly hinged rotor blades is preferred for tidal power plants due to the difficult accessibility for maintenance. In many cases, in addition to a device for rotating the system is dispensed with the vertical axis and instead uses a rotor with bidirectionally flowable rotor blades. As a result, when the overload occurs, the rotor blades can not be transferred to the feathering position by means of a pitch angle adjustment, as is typically the case with the design used for wind turbines. The entire system can not turn out of the flow. Accordingly, there is a high

Requirement for the structural stability of the rotor blade connection for

Tidal power plants that are too heavy, bulky and expensive

Fixing components leads. The previously known rotor design for axial turbines of tidal power plants is based on a modular rotor for which the individual

Rotor blades are mounted separately on a hub. For this purpose, the hub

Recordings for Blattbefestigungsabschnitte the rotor blades. such

Blade attachment portions are typically cylindrically applied, with a transition region to the flow field interacting profiled rotor blade portions being provided with high structural stability. For this purpose, reference is made by way of example to WO 2010/125478 AI. The cylindrical

Blade attachment portions typically have a diameter that is less than the chord length of the immediately adjacent profiled one

Rotor blade sections and larger than the profile thickness in this area. So there is a constriction from which results a notch effect at a load of the rotor blades, which must be secured by additional structural reinforcements. Furthermore, the known blade attachment portions at the hub end typically have a mounting flange which serves to form a threaded connection between the blade attachment portion of the rotor blade and the adjoining hub portion of the rotating unit. For

Wind turbines, such a rotor blade attachment, for example, by US 6,305,905 Bl discloses. Appropriate mounting flanges for

Rotor blades on a hub of a tidal power station result from the

GB 2467226 A, wherein an integrally formed with the profiled rotor blade section, flange-shaped blade attachment portion for securing on

Hub part is covered by a mounting ring. For further

Rotor blade connections are referred to US 5173023 and GB 502409.

The invention has for its object to provide a rotor assembly for a

Specify axial turbine with a variety of individually mountable rotor blades, which is characterized by a high structural stability of the rotor blade mounts and by an efficient force and torque transmission to a subsequent drive shaft. In addition, a rotor blade design is desired that allows easy replacement of individual rotor blades. Furthermore, the

Rotor arrangement serve in particular for the operation of a tidal power plant and are preferably suitable for the formation of a bidirectionally flowable axial turbine. In this case, the rotor assembly in particular must be able to intercept asymmetric load peaks acting only on individual rotor blades and to simplify the design and manufacturing technology. Furthermore, an assembly method for such a rotor blade assembly is sought.

The invention is solved by the features of the independent claims. The inventors have recognized that instead of attaching individual rotor blades to a hub, the load capacity of a rotor blade holder increases by dispensing with an integral hub component. According to the invention, individual

Hub segments associated with the interchangeable rotor blades. These form mutually at least in the circumferential direction and at least indirectly supporting sheet attachment sections.

For bi-directionally drivable rotors, not only pressure forces in the circumferential direction between the blade attachment sections are preferably imparted, but tensile forces in the circumferential direction and axial force components are additionally absorbed by a releasable connection of adjacent blade attachment sections. As a releasable connection are preferably a screw and / or a positive connection in question, so at a

Plant maintenance individual rotor blades can be readjusted or replaced separately. The blade attachment portions form a segmented hub portion for an advantageous design after the assembly on the drive shaft has been performed by the interaction with the respective adjacent blade attachment portions.

Each rotor blade of the rotor blade assembly according to the invention comprises a profiled sheet section and one hereby preferably cohesively

connected sheet attachment portion, which is supported on a corresponding blade mounting portion of an adjacent rotor and / or releasably connected thereto. Here, the profiled rotor section of

Rotor blades with the flow field in a usable manner

interacting part of the rotor blade. When driven by a

Water flow is therefore the profiled rotor blade section of the

Hydrodynamically effective part of the rotor blade with an adapted blade profile. In the case of a bi-directionally impingable rotor for a tidal power station, symmetrical profiles are used for this purpose, wherein, for example, an elliptical geometry for a double-axis symmetrical profile can be present. Alternatively, point-symmetrical profiles with a profile curvature, ie S-shaped profiles, can be used. Particularly preferably, each rotor blade has a one-part design of the associated profiled rotor blade section and the associated

Blade mounting section on. In this case, the rotor blade can be made of a GRP or CFK material or steel, with investment areas on the

Blade mounting portions for power transmission

Blade mounting portions serve an adjacent rotor blade, preferably by the embedding of abrasion resistant materials, such as a coupling element made of metal, reinforced. For a further advantageous embodiment, the sheet fastening sections are produced as castings. These are made of steel, CFRP or GRP made profiled rotor blade sections cohesively.

For an alternative embodiment, stub wings are integrally attached to the blade attachment portion, which form a first part of the profiled rotor blade portion, wherein a second part of the profiled rotor blade portion with the

Stub wing is releasably connected. The transition from the first part to the second part of the profiled rotor blade section can be designed as a predetermined breaking point to secure the entire system from serious destruction in case of overload. Furthermore, it is possible to provide this transition region with an elasticity for realizing a bending rotational coupling of the rotor blade.

The blade attachment portions are positively secured and / or by means of a screw to a drive shaft of the rotor assembly, so that each individual rotor blade is rotationally rigidly connected to the drive shaft. These

Connection can be transmitted by one or more of the intermediate elements, so that the torsionally rigid articulation of the rotor blades is present at least indirectly. For the inventively designed rotor blade assembly is only a part of the introduced from the profiled rotor blade sections forces and

Moments transmitted to the respective connection of the rotor blades with the drive shaft, since another part of the force by the mutual

Supporting the adjacent blade attachment sections is intercepted. For a preferred embodiment, the connection between the rotor blade and the drive shaft is carried out on an axial end face of the blade mounting portion, which in the assembled position of an axial end face on the

Opposite drive shaft. This caused by the flow to a

Rotor blade in particular thrust loads in the axial direction, the force components in the circumferential direction of the contact areas adjacent

Guide leaf attachment sections. For this reason, covers for one

Advantageous embodiment of the invention, each blade mounting portion has a first contact area and a second contact area and the above-described third contact area to the drive shaft. Preferably, the first contact region ^" and the second contact region are spatially separated." Alternatively, the first contact region and the second contact region adjoin one another and merge into one another.

The first and the second investment area are defined by respective ones

Interaction with the directly adjacent arranged rotor blade. For a first embodiment, the first investment area is based on

Blade mounting portion of a first, directly adjacent rotor blade at least indirectly from and the second abutment region is based at least indirectly from the blade mounting portion of a second, directly adjacent rotor blade. In this way, it is possible to realize a rotor of an axial turbine in the leeward mode which is streamed from an axial direction. For a bidirectionally inflatable rotor, which is suitable both for the lee and for the windward operation, the first contact area and the second contact area preferably have means for detachable connection to the respectively adjacent one

Blade mounting portion of the adjacent rotor blade on. These can be in the form of a screw connection and / or as a positive connection

be educated. Particularly preferably, the contact areas are displaced into the mechanically less loaded intermediate blade areas. These intermediate sheet areas are defined by the fact that their angular offset in the circumferential direction to a

Parting plane between adjacent rotor blades is a maximum of ± 30 ° and preferably a maximum of ± 15 °. The dividing plane runs in the middle between

adjacent rotor planes, which are associated with individual rotor blades and are respectively spanned by the axis of rotation of the drive shaft and a further straight line which is characteristic of the transition from the profiled rotor blade section to the blade attachment section. In the simplest case, a rotor blade with a radial jet geometry is present, that is to say the threading lines of the profiled rotor blade sections follow a straight line in the radial direction. In this case, a rotor plane is defined by the threading line and the axis of rotation. However, it may be the case that the profiled rotor blade sections go sickled. So a design is conceivable for the profiled

Rotor blade sections, although in the rotor plane, as the axisymmetric to

Rotary axis is defined, run, but the Auffädellinien no straight line follow. Furthermore, it is conceivable that the profiled rotor blade sections are curved so that they leave the rotor plane. For such a way

spatially applied profiled rotor blade sections is used to define the rotor plane on a predetermined profile section in the transition from

Blade attachment portion to the profiled rotor blade section

characteristic point, for example, the point on the chord line at half tread depth selected. A straight line passing through this point in

Radial direction and the axis of rotation then define the rotor plane.

In the case of a rotor with more than three rotor blades are the

Interleaf areas preferably in an angular interval of 40 - 60% of the angle, by a section of the rotor plane adjacent to each other lying rotor levels is formed. For a rotor on which much higher shear forces act as torsional forces, the intermediate blade areas are in

Relative to the remaining areas of the blade mounting portions loaded less. In this area are advantageously the connecting elements for the blade mounting portions of adjacent rotor blades. These can, for example, represent form-fitting interlocking components, which can be fastened to one another by a relative movement in the axial direction of the rotor. According to an advantageous embodiment lies between adjacent blade attachment sections, in particular the facing each other

Investment areas, an elastic intermediate layer before. Come to this

heavy duty elastomers typically used to form

seawater resistant plain bearings are used, in question. These materials are typically resilient to pressure and have high abrasion resistance for hard / soft pairing. Due to the elastic intermediate layer, a certain relative movement of adjacent rotor blades, which arises due to impact loads, can be compensated. For a further design, it is conceivable, the detachable connection between the blade mounting sections of adjacent rotor blades by additional

To mediate intermediate elements. In contrast to the known IMabenbauteilen but these do not form an integral structure, but are designed as separate and spatially separated components. For one

Further embodiment of the invention, these intermediate elements are adapted to adapt the mounting position of the rotor blades to the respective location. This allows the use of standardized rotor blades and a change in the

Rotor blade geometry, in particular the angle of attack of the profiled

Rotor blade sections, by an appropriate choice of the intermediate elements. Particularly preferred is an embodiment for which the totality of

Blade mounting portions of the rotor in the fastened state surrounds a central open area, which serves to receive a shaft portion of a subsequent to the rotor drive shaft. Particularly preferably, the contour of the central free area is designed so that it deviates from the circular contour and transmits the drive torque generated by the rotor by a positive connection with a correspondingly complementary formed shaft stub.

In addition to the displacement of the connecting elements in the less loaded intermediate blade areas, the design of the invention allows the reduction of the notch effect in the transition from the profiled rotor blade sections to the blade mounting sections. This is achieved by replacing the hitherto customary cylindrical configuration of the blade attachment section for accommodation in a recess on a hub part by assigning a hub segment to a single rotor blade. This results in large-scale construction

Blade mounting sections without the segmented hub part resulting from the merging of the rotor blades experiencing an increase in size.

To reduce the notch effect are preferably in the range of

Radial section of the rotor blade, which defines a transition region between the profiled rotor blade sections and the blade attachment section, no constrictions. Particularly preferred is a transition region which leads above a limiting radius in the direction radially outward to a continuous taper of the rotor blade. Also conceivable is an alternative embodiment for which the profile areas which are essential for structural stability, i. the

Profile noses, protrude slightly beyond the transverse extent of the blade attachment section on the profiled rotor blade section. In this connection, the profile chord in this connection region can exceed the transverse extent of the blade attachment section by up to 20%, without a significant increase in the notch effect resulting. Embodiments will be explained in more detail with reference to figure representations. These represent the following:

Figure 1 shows a perspective view of a first embodiment of a rotor assembly according to the invention in the partially assembled state.

Figure 2 shows a second embodiment of an inventive

Rotor assembly partially assembled in perspective view.

FIG. 3 shows an alternative rotor design in axial plan view.

FIG. 4 shows a detail of FIG. 3 in an enlarged view.

FIG. 5 shows a rotor arrangement according to the invention with a rotor according to FIG

Figure 3 in the assembled state on a drive shaft.

FIG. 6 shows a further, alternative rotor design in an axial plan view.

FIG. 1 shows in a schematically simplified representation a rotor arrangement according to the invention with a drive shaft 1 and a rotor 20 with three

Rotor blades 2.1, 2.2, 2.3. The drive shaft 1 includes a rotation axis 21 that defines an axial direction 22 and a circumferential direction 23. Every rotor blade

2.1, 2.2, 2.3 comprises a profiled rotor blade section 3.1, 3.2, 3.3 for interaction with the flow field and a blade attachment section 4.1,

4.2, 4.3. The blade mounting sections 4.1, 4.2, 4.3 are torsionally rigidly connected to the drive shaft 1. For this purpose, the bores 17.1, ..., 17.n on a first axial end face 24, which correspond to threaded bores 27.1, ..., 27.n on the axial end face 26 of the drive shaft 1. It is for the rotor blade 2.1 of the profiled rotor blade section 3.1 for the illustrated, preferred design with the associated

Blade attachment portion 4.1 cohesively connected. Accordingly, the other rotor blades 2.2, 2.3 designed so that a material connection between the respective profiled rotor blade section 3.2, 3.3 and the associated blade mounting section 4.2, 4.3 exists. The rotor blades 2.1, 2.2, 2.3 can be made of different materials of construction. In addition to castings, steel and fiber composites based on GRP and CFRP, this is an option. The connection of different materials for the formation of the rotor blades 2.1, 2.2, 2.3 is conceivable.

Each blade mounting portion 4.1, 4.2, 4.3 includes a first axial end face 24 and a second axial end face 25 formed by spaced-apart plate-shaped members. At a first investment area 7.1, 7.2, 7.3 and at a second plant area 8.1, 8.2, 8.3 are the

plate-shaped elements by a mounted state in a

Axialschnittesebene the drive shaft 21 extending end plate connected, so that a lightweight but warp-resistant structure is formed by the side openings 32 in the box-shaped structure a simple

Accessibility for installation work offers.

In the assembled state, the first contact area 7.1, 7.2, 7.3 for a first rotor blade 2.1, 2.2, 2.3 is the second contact area 8.1, 8.2, 8.3 am

Blade attachment section 4.1, 4.2, 4.3 of a directly adjacent

Rotor blades 2.1, 2.2, 2.3 opposite. The first bearing areas 7.1, 7.2, 7.3 and the second bearing areas 8.1, 8.2, 8.3, which assign each other in the assembled state, serve for the mutual support of the sheet fastening sections 4.1, 4.2, 4.3 in the circumferential direction 23. For the direction of flow 28 shown in FIG. 1, the rotor 20 is located on the leeward side. As a result, the resulting thrust forces 30.1, 30.2, 30.3 on the

profiled rotor blade sections 3.1, 3.2, 3.3 in the blade mounting sections 4.1, 4.2, 4.3 to the outlined force components 29.1, 29.2 in the circumferential direction 23, which are intercepted by mutual contact of the blade mounting sections 4.1 and 4.3.

Figure 2 shows a further embodiment of the invention for a bidirectional

Anströmbare rotor assembly, wherein at the first bearing portions 7.1, 7.2, 7.3 and the second bearing areas 8.1, 8.2, 8.3 fastening means are present to intercept the outlined by the force components 29.3, 29.4 alternating compressive and tensile forces. Exemplary are this dovetail-shaped

Fastening elements 10.1, 10.5 shown, which allow a merging of the blade mounting sections 4.1, 4.2, 4.3 by an axial movement of the respective rotor blade 2.1, 2.2, 2.3 relative to the already mounted components. As an additional, releasable connection of the blade attachment sections 4.1, 4.2, 4.3 serve screw - this is exemplified in Figure 2

Fastener 6 shown. Another embodiment is shown in FIG. Shown is a plan view of the first axial end face 24 of the blade mounting sections 4.1, 4.2, 4.3 with holes 17.1 - 17. n for attachment to a drive shaft 1, which is outlined in Figure 5. FIG. 4 shows, as a section in the plane defined by the longitudinal axes 9.1, 9.2, 9.3 of the profiled rotor blade sections 3.1, 3.2, 3.3, the second contact area 8.2 on the blade fastening section 4.2 and the first one

Appendix area 7.3 on the blade mounting section 4.3 in an enlarged view. The contact areas 8.2, 7.3 can be released by bolts 11.1, 11.2

connected, which include an elastic intermediate element 13 and bias. For this purpose, an elastic sliding bearing material, for example, the elastomer is suitable Orkot®. The elastic intermediate element 13 allows a certain mobility of the rotor blades 2.1, 2.2, 2.3 in the case of an asymmetric load.

Furthermore, it can be seen from FIG. 4 that, for the illustrated preferred embodiment, a side opening 31 is made in the box-shaped manner

Blattbefestigungsabschnitten 4.2, 4.3 is present, the weight of

Reduced rotor blade connection and accessibility to those for the

Shaft connection used holes 17.1 - 17. n for mounting

allows.

Furthermore, it can be seen from FIG. 4 that the mutual support points of the blade attachment sections 4.1, 4.2, 4.3 in an intermediate blade area 18.1, 18.2, 18.3 between the force introduction areas at the transition to the

profiled rotor blade sections 3.1, 3.2, 3.3 are applied. For clarification, between the second abutment area 8.2 of the blade attachment section 4.1 and the first abutment area 7.2 of the blade attachment section 4.2, a separation plane 32 is sketched which lies at half the angle between the longitudinal axes 9.1 and 9.2 of the profiled rotor blade sections 3.1, 3.2, which in conjunction with the surface normal to the paper plane (Axial direction) define the rotor planes for the rotor blades 2.1, 2.2. Within one by one maximum

Angular offset of +/- 15 ° specified intermediate sheet area 18.1, 18.2, 18.3 are those areas that in relation to the other parts of

Blade mounting sections 4.1, 4.2, 4.3 are subjected to less load during operation of the rotor 20.

Another structural reinforcement results from an advantageous design of the transition regions 19.1, 19.2, 19.3 between the profiled

Blade sections 3.1, 3.2, 3.3 and the blade attachment sections 4.1, 4.2, 4.3. In this case, the advantageous embodiment according to Figure 3 shows an outer contour which is free of constrictions, so that the notch effect on the Rotor blade connections is reduced. Furthermore, from a certain radius, it is particularly preferable for a continuous taper to be present

Blade mounting portion for profiled rotor blade section 3.1, 3.2, 3.3 radially outward before.

In the assembled state form the releasably interconnected

Blade mounting sections 4.1, 4.2, 4.3 of the rotor blades 2.1, 2.2, 2.3 a segmented hub part 5, which has a central open area 14 for an advantageous embodiment. For the embodiment shown in FIG. 3, the central open area 14 is triangular with respect to a section in the rotor plane. Such, from the circular shape deviating central open area 14 of the segmented hub part 5 allows for the successive assembly of all

Rotor blades 2.1, 2.2, 2.3 of the rotor 20 pushing on a complementary shaped shaft stub 16 of a drive shaft 1, to which a positive connection is made. This is shown in Figure 5 as a plan view of the second axial end face 25 of the rotor 20. In this case, the concealed, first axial end face 24 with the not visible in Figure 5 holes 17.1, 17.n for attachment to the axial end surface 26 of the drive shaft 1 is located. A rotor 20 mounted in this way can be partially assembled for maintenance purposes by exchanging individual rotor blades 2.1, 2.2, 2.3 separately or readjusting them with respect to the relative position to the other rotor components or to the drive shaft 1. For this purpose, it is conceivable that the holes 17.1, 17.n through the use of

Slotted holes allow a certain amount of assembly. For a further design, not shown in detail adjoins the shaft stub 16 a releasably connected to the drive shaft 1 fuse element, which in the

Mounting position, the second axial end face 25 of the blade mounting sections 4.1, 4.2, 4.3 overlaps and axially secures.

For the embodiment shown in Figure 6 are for the realization of the detachable connection of the blade mounting sections 4.1, 4.2, 4.3 Intermediate elements 13.1, 13.2, 13.3 used. These represent separate, spatially separated components and serve to couple the rotor blades 2.1, 2.2, 2.3. For a further design not shown in the figures, the intermediate elements 13.1, 13.2, 13.3 have a positive connection to the shaft stub 16 of the drive shaft 1.

In addition, a configuration is conceivable for which system-specific adapted intermediate elements 13.1, 13.2, 13.3 are used, which realize a tilt adjustment of the rotor blades 2.1, 2.2, 2.3. The resulting unevenness in this case on the end face of the rotor 20, which points to the adjacent drive shaft 1, must for safe investment with

be supported according to adapted wedge elements. Further

Embodiments result from the following claims.

LIST OF REFERENCE NUMBERS

drive shaft

.1, 2.2, 2.3 Rotor blade

.1, 3.2, 3.3 profiled rotor blade section; 1, 4.2, 4.3 blade attachment section

segmented hub part

Fastening element.1, 7.2, 7.3 first contact area

.1, 8.2, 8.3 second area of investment

.1, 9.2, 9.3 longitudinal axis

0.1, ^'10 .6 positive locking element1.1, 11.2 bolt

2.1, 12.2, 12.3 elastic intermediate layer

3.1, 13.2, 13.3 Interleaf area

4 central outdoor area

6 shafts

7.1, 17.n bore

8.1, 18.2, 18.3 Rotor blade interspaces

9.1, 19.2, 19.3 transitional area

0 rotor

1 rotation axis

2 axial direction

3 circumferential direction

4 first axial end face

5 second axial end face

6 axial end surface

7.1, ..., 27.n threaded hole

8 direction of flow Force component Thrust side opening Parting plane Angular offset

Claims

claims

1. comprising rotor assembly

1.1 a drive shaft (1) having an associated axis of rotation (21) defining an axial direction (22) and a circumferential direction (23);

1.2 a rotor (20) with a plurality of rotor blades (2.1, 2.2, 2.3), each having a profiled rotor blade section (3.1, 3.2, 3.3), the in

Axialrichtung (22) is flowed, and a Blattbefestigungsabschnitt (4.1, 4.2, 4.3) include;

1.3 wherein each blade mounting portion (4.1, 4.2, 4.3) a first

Investment area (7.1, 7.2, 7.3) and a second investment area (8.1, 8.2, 8.3) includes and the first investment area (7.1, 7.2, 7.3) on

Blade mounting portion (4.1, 4.2, 4.3) of a first adjacent rotor blade and the second contact area (8.1, 8.2, 8.3) on

Blade mounting portion (4.1, 4.2, 4.3) of a second adjacent rotor blade (2.1, 2.2, 2.3) at least indirectly supported;

characterized in that

1.4, the sheet attachment sections (4.1, 4.2, 4.3) positively and / or

are fastened by means of a screw connection (17.1, 17.n) to the drive shaft (1), so that a connection between the rotor blade and

Drive shaft ah is an axial end face of the blade mounting portion, which faces in the assembled position of an axial end surface on the drive shaft; and

1.5 for each rotor blade (2.1, 2.2, 2.3) the transition from the profiled

Rotor blade section (3.1, 3.2, 3.3) to the blade mounting portion (4.1, 4.2, 4.3) has an outer contour which is free of constrictions.

2. Rotor arrangement according to claim 1, characterized in that the

Blade attachment sections (4.1, 4.2, 4.3) or the entirety of Blade mounting portions (4.1, 4.2, 4.3) and the intermediate elements (13.1, 13.2, 13.3) form a segmented hub part (5) of the rotor (20).

Rotor arrangement according to claim 1, characterized in that the first abutment region (7.1, 7.2, 7.3) and the second abutment region (8.1, 8.2, 8.3) each with the blade attachment portion (4.1, 4.2, 4.3) of a

adjacent rotor blade (2.1, 2.2, 2.3) are detachably connected and the detachable connections as screw and / or as

positive connections are formed.

Rotor arrangement according to claim 1, characterized in that the first abutment region (7.1, 7.2, 7.3) and the second abutment region (8.1, 8.2, 8.3) of the blade attachment sections (4.1, 4.2, 4.3) each in one

Intermediate sheet area (18.1, 18.2, 18.3) are arranged, whose

Angular offset in the circumferential direction to a parting plane (32) between adjacent rotor blades (2.1, 2.2, 2.3) is a maximum of +/- 30 °.

Rotor arrangement according to one of the preceding claims, characterized in that intermediate elements (13.1, 13.2, 13.3) with an elastic intermediate layer (12.1, 12.2, 12.3) are present between the blade attachment sections (4.1, 4.2, 4.3) of adjacent rotor blades (2.1, 2.2, 2.3) ,

Rotor arrangement according to one of the preceding claims, characterized in that the rotor (20) has a plurality of separate and spatially separated intermediate elements (13.1, 13.2, 13.3) which produce a releasable connection of adjacent blade attachment sections (4.1, 4.2, 4.3).

7. Rotor arrangement according to one of the preceding claims, characterized

characterized in that for each rotor blade (2.1, 2.2, 2.3) of the associated profiled rotor blade section (3.1, 3.2, 3.3) and the associated

Blade mounting portion (4.1, 4.2, 4.3) are materially connected.

Rotor arrangement according to one of claims 1-7, characterized in that a stub wing integrally connected to each blade attachment portion (4.1, 4.2, 4.3), which profiled a first part of the

Rotor blade section (3.1, 3.2, 3.3), wherein a second part of the profiled rotor blade section (3.1, 3.2, 3.3) is releasably connected to the stub wing.

Rotor arrangement according to one of the preceding claims, characterized in that the blade attachment sections (4.1, 4.2, 4.3) enclose a central open area (14) of the rotor (20).

Rotor arrangement according to claim 9, characterized in that the contour of the central clearance area (14) in a rotor plane of the

Circle contour deviates.

11. A method for assembling a rotor assembly comprising

11.1 a drive shaft (1) having an associated axis of rotation (21) defining an axial direction (22) and a circumferential direction (23);

11.2 a rotor (20) with a plurality of rotor blades (2.1, 2.2, 2.3), the. each a profiled rotor blade section (3.1, 3.2, 3.3), in

Axialrichtung (22) is anströmbar, and a blade mounting portion (4.1, 4.2, 4.3) include, wherein the transition from the profiled

Blade section (3.1, 3.2, 3.3) to the blade mounting portion (4.1, 4.2, 4.3) has an outer contour which is free of constrictions; and

11.3 wherein each blade attachment section (4.1, 4.2, 4.3) has a first

Investment area (7.1, 7.2, 7.3) and a second investment area (8.1, 8.2, 8.3) comprises and the first investment area (7.1, 7.2, 7.3) for at least indirect support against the blade attachment portion (4.1, 4.2, 4.3) of a first adjacent rotor blade and the second contact area (8.1, 8.2, 8.3) for at least indirect support against the

Blade mounting portion (4.1, 4.2, 4.3) of a second adjacent rotor blade (2.1, 2.2, 2.3) are guided; and

11.4 the blade mounting sections (4.1, 4.2, 4.3) are positively secured and / or by means of a screw (17.1, 17.n) to the drive shaft (1) so that a Verbindüng between the rotor blade and drive shaft formed on an axial end face of the blade mounting portion, in the assembly position an axial end surface opposite to the drive shaft.

12. The method according to claim 11, characterized in that the

Blade mounting portions (4.1, 4.2, 4.3) or the entirety of the blade mounting portions (4.1, 4.2, 4.3) and the intermediate elements (13.1, 13.2, 13.3) are arranged so that they form a segmented hub portion (5) of the rotor (20).