EP3146201A1 - Dispositif aérodynamique d'une pale de rotor d'une éolienne - Google Patents
Dispositif aérodynamique d'une pale de rotor d'une éolienneInfo
- Publication number
- EP3146201A1 EP3146201A1 EP15716486.4A EP15716486A EP3146201A1 EP 3146201 A1 EP3146201 A1 EP 3146201A1 EP 15716486 A EP15716486 A EP 15716486A EP 3146201 A1 EP3146201 A1 EP 3146201A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor blade
- aerodynamic device
- aerodynamic
- wind turbine
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000013461 design Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 3
- 239000013013 elastic material Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 9
- 238000013459 approach Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/10—Stators
- F05B2240/13—Stators to collect or cause flow towards or away from turbines
- F05B2240/132—Stators to collect or cause flow towards or away from turbines creating a vortex or tornado effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05B2240/305—Flaps, slats or spoilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05B2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape
- F05B2240/311—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape flexible or elastic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Definitions
- Aerodynamic device of a rotor blade of a wind turbine The invention relates to a rotor blade of a wind turbine, wherein the rotor blade comprises a rotor blade body and an aerodynamic device.
- the design of a wind turbine is influenced by a plurality of factors.
- One of the most important of these factors is the loading of the rotor blade, in particular the maximum allowable loading of the rotor blade.
- High loading of the rotor blade typically occurs during extreme operating conditions. These extreme operating situations include situations where the lift of the rotor blade is maximum and the relative speed of the rotor blade is high. These extreme operating conditions may occur at extreme turbulences, occurrence of gusts or emergency events such as a shutdown of the wind turbine at wind speeds which are close to the rated maximum wind speed allowed for the wind turbine.
- the maximum allowable load of the rotor blade has a direct impact on the structural requirements, e.g. the design limit, of the rotor blade.
- the problem of reducing high loads of the rotor blade is highly relevant and has been addressed in several ways in the past.
- a rotor blade assembly which comprises a spoiler assembly operable to alter a flow past a surface of the rotor blade is disclosed.
- the spoiler assembly is incrementally deployable from the surface of the rotor blade.
- a wind turbine blade which comprises an active elastic member arranged with access to the surface of the wind turbine blade is provided.
- the active elastic member is deformable from a first shape to a se- cond shape and thus the lift coefficient of the wind turbine blade is advantageously influenced by this active elastic member .
- a rotor blade of a wind turbine wherein the rotor blade comprises a rotor blade body and an aerodynamic device.
- the aerodynamic device comprises a first portion by which the aerodynamic device is attached to the rotor blade body, and a second portion which is movable with regard to the rotor blade body.
- the aerodynamic device is configured such that if load on the aerodynamic device exceeds a predetermined value, a torque is gen- erated on the second portion of the aerodynamic device such that the second portion is passively deflected; and due to the deflection of the second portion of the aerodynamic device, the airflow flowing from the leading edge section to the trailing edge section of the rotor blade is deviated such that load on the rotor blade is alleviated.
- the rotor blade is characterized in that the first portion and the second portion of the aerodynamic device are located at different spanwise positions of the rotor blade.
- a wind turbine refers to a device that can convert wind energy, i.e. kinetic energy from wind, into mechanical energy. The mechanical energy is subsequently used to generate elec- tricity.
- a wind turbine is also denoted a wind power plant.
- the aerodynamic device is attached to the rotor blade body at the trailing edge section.
- the aerodynamic device is also a part of the trailing edge section of the rotor blade.
- the aerodynamic device can be subdivided into the first portion and the second portion. Note that this division may be a purely virtual division and that the border between the first portion and the second portion may be invisible re- garding the aerodynamic device.
- the division into the first portion and the second portion rather comes from a functional perspective.
- the first portion of the aerodynamic device refers to the part of the aerodynamic device by means of which the aerodynamic device is firmly and durably at- tached to the rotor blade body of the rotor blade.
- the second portion refers to the part of the aerodynamic device which is aligned to the rotor blade body of the rotor blade but which is misaligned to the rotor blade body due to deflection of the aerodynamic device under certain conditions.
- continuous deflection of the second portion of the aerodynamic device occurs according to the load which is applied to the rotor blade.
- deflection of the second portion of the aerodynamic device occurs if the load which is applied to the rotor blade, in particular to the aerodynamic device, ex- ceeds a predetermined critical load.
- a threshold value of the load on the rotor blade is predetermined above which the second portion of the aerodynamic device passively deflects.
- the torque which is generated on the second portion of the aerodynamic device, is also referred to as the moment or moment of force.
- the torque is understood to be the product of distance of the point where the external loading force ap- plies from the axis of rotation times the external force.
- the first portion of the aerodynamic device is firmly attached to the rotor blade body of the rotor blade.
- a key aspect of the present invention is that due to the deflection of the aerodynamic device loading of the rotor blade is reduced.
- an effect of the described aerodynamic device is that it selectively influences the load of the rotor blade.
- An advantage of the described rotor blade is that the aerodynamic device does not need any external energy supply in order to be activated.
- the aerodynamic device is particularly activated at high loading, while it does not affect operation of the rotor blade during normal operation conditions. Distinction between normal operation conditions and high loads or extreme conditions can e.g. be made by an appropriate choice of the predetermined critical load above which the second portion of the aerodynamic device passively deflects. Note, however, that the aerodynamic device may also be designed such that it bends at medium loads, e.g. at loads which typically occur at wind speeds where the wind turbine reaches it rated power. Concretely, the aerodynamic device may start being deflected at wind speeds between 8 m/s and 14 m/s .
- the advantage of the inventive flap compared to the flap as e.g. disclosed in DK 9 500 009 U3 is that more design flexibility exists.
- Another advantage of the proposed solution is that it is in- expensive and durable as it can be manufactured by cheap materials and does not need significant maintenance.
- a beneficial result of using such a rotor blade is that also other components of the wind turbine such as the pitch bear- ing tower or the main frame of the wind turbine are less stressed and less loaded, thus allowing for either an up scaling of the wind turbine or a reduction of the costs of the components. Both options are beneficial for a reduction of the cost of energy produced by the wind turbine.
- the second portion of the aerodynamic device may either be in direct contact with the rotor blade body or be in close proximity to the rotor blade body .
- the aerodynamic device may be made of elastomeric polymer, in particular rubber.
- An advantage of manufacturing the aerodynamic device by elastomeric polymer is that elastomeric polymer is a material that is readily available, relatively inexpensive and well proven for the use in components of a wind turbine. Furthermore, elastomeric polymer has the capability to provide a reversible deflection of the second portion of the aerodynamic device over a long time span, even at harsh con- ditions under which the wind turbine may operate.
- the rotor blade may comprise a plurality of aerodynamic devices.
- the aerodynamic device may have a
- the aerodynamic device may have, for instance, a spanwise extension of 20 cm. Having in mind that the total spanwise extension of the rotor blade may easily exceed 50 meters or even 100 meters, it is therefore advantageous to provide a plurality of aerodynamic devices in order to efficiently impact the loading of the rotor blade.
- the aerodynamic devices of the plurality of aerodynamic devices are aligned along the spanwise direction of the rotor blade.
- the aerodynamic devices are beneficially aligned along the trailing edge.
- two neighboring aerodynamic devices of the plurality of aerodynamic devices are directly adjacent to each other. This has the advantage that the full area along the trailing edge is used and covered by aerodynamic devices. Thus, a maximum benefit can be drawn from the deformable aerodynamic devices .
- two neighboring aerodynamic devices of the plurality of aerodynamic devices are spaced apart from each other. This may be advantageous from a manufacturing point of view. Concretely, it may be easier to integrate the aerodynamic devices to the trailing edge section of the rotor blade if certain spacing between two neighboring aerodynamic devices is present.
- the aerodynamic device is shaped as a flap .
- the aerodynamic device may have an elongated shape comprising a long side and a short side.
- the aerodynamic device is orientated with its long side along the spanwise direction of the rotor blade.
- the second portion of the aerodynamic device advantageously deflects towards the suction side of the rotor blade.
- the aerodynamic device in particular the second portion of the aerodynamic device, is deflected or bent such that the airflow between the leading edge section and the trailing edge section of the rotor blade is disrupted in such a manner that flow separation is caused. Due to the flow separation the lift of the rotor blade is reduced and the load of the rotor blade is reduced as well.
- the aerodynamic device comprises a serrated trailing edge.
- a serrated trailing edge which is also referred to as a sawtooth trailing edge or serrated panels are a well-known feature to reduce noise which is generated by the rotor blade and/or to increase the efficiency of the rotor blade. It is beneficial to combine this feature with the deformable aero- dynamic device.
- the aerodynamic device is shaped as a Gurney flap and is situated at the pressure side of the rotor blade . Gurney flaps as such are also well-known for aircraft wings or rotor blades of a wind turbine to increase the lift. However, with conventional Gurney flaps which are mounted on the pressure side close to the trailing edge of a rotor blade the lift of the rotor blade is potentially increased over the whole range of relevant angles of attack of the rotor blade.
- the aerodynamic device shaped as a Gurney flap presented here has the advantage that in a loaded state of the rotor blade the Gurney flap is deflected and at least this part of the trailing edge thus bends away from the airfoil in a direction parallel to the airflow, flowing from the leading edge section to the trailing edge section of the rotor blade. As a consequence, the lift enhancing effect of the Gurney flap is lost or at least decreased, thus the load of the rotor blade is decreased, too.
- the aerodynamic device is rotatable mounted .
- the aerodynamic device has a predetermined rotational stiffness such that rotation of the aerodynamic device is only activated in a loaded state of the rotor blade .
- the aerodynamic device comprises an axis of rotation which is substantially parallel to the chord line of the airfoil profile of the rotor blade. The aerodynamic device is mounted rotatable about the axis of rotation to the rotor blade body.
- the orientation of the aerodynamic device can also be described such that the axis of rotation of the aerodynamic device is substantially parallel to the wind, i.e. the airflow, flowing from the leading edge section to the trailing edge section of the rotor blade.
- the wind flow is substantially parallel to the axis of rotation, there are still some components in the wind flow which induce a ro- tation of the aerodynamic device if e.g. the load exceeds a predetermined threshold value, namely the critical load.
- the aerodynamic device is rotationally symmetric about an axis of rotational symmetry, and the axis of rotation is different from the axis of rotational symmetry. Consequently, this leads to a preferred rotational direction of the aerodynamic device if the aerodynamic device is deflected .
- the fourth embodiment does not necessarily involve a structural change of the aerodynamic device. In other words, while in the previous embodiments the shape of the aerodynamic device changes due to the deflection above a certain load, in the fourth em- bodiment the structure of the aerodynamic device may remain unchanged. However, an orientation of the aerodynamic device with regard to the rotor blade body of the rotor blade occurs.
- the first portion of the aerodynamic device which is firmly attached to the rotor blade body can be referred to the area around the axis of rotation, in other words around the hinge where the aerodynamic device is connected to the rotor blade body.
- the remaining part of the aerodynamic device can be referred to as the second portion.
- the arrangement of the axis of rotation and the axis of rotational symmetry of the aerodynamic device can be chosen such that in a loaded state of the rotor blade, e.g. for loads exceeding the critical load, two neighboring aerodynamic devices are rotated, i.e. deflected in the same direction of rotation.
- the axis of rotation and the axis of rotational symmetry of two neighboring aerodynamic devices are chosen such that in the loaded state of the rotor blade the two neighboring aerodynamic devices are rotated in opposite directions of rotation.
- Which one of the two options is advantageous depends on the specific design of the rotor blade body of the rotor blade as well as the operational mode of the rotor blade.
- the rotor blade body comprises an airfoil profile which has a flatback profile at its trailing edge section.
- the trailing edge section does not comprise a sharp trailing edge but features rather a blunt trailing edge .
- the described aerodynamic device is applied to an aeroelastically tailored rotor blade.
- These type of rotor blades are also referred to as swept or curved rotor blades .
- the aerodynamic device may also have a cascading functionality. This includes a first passive bending of the aerodynamic device for a first load applied to the rotor blade and a second passive bending of the aerodynamic de- vice.
- Figure 1 shows a wind turbine
- Figure 2 shows a rotor blade of a wind turbine
- FIG. 3A and B show a first embodiment of an aerodynamic device in an unloaded state and a loaded state of the rotor blade, respectively;
- FIGS. 4A and 4B show a second embodiment of an aerodynamic device in an unloaded state and a loaded state of the ro- tor blade, respectively;
- 5A and 5B show a third embodiment of an aerodynamic device in an unloaded state and a loaded state of the rotor blade, respectively;
- FIGS. 6A to 6C show a fourth embodiment of an aerodynamic device in an unloaded state and loaded states of the rotor blade, respectively;
- FIG. 8 shows the influence of the aerodynamic device on the curve of the lift coefficient with regard to the angle of attack.
- the illustration in the drawings is in schematic form. It is noted that in different figures, similar or identical elements may be provided with the same reference signs.
- a wind turbine 10 is shown.
- the wind turbine 10 comprises a nacelle 12 and a tower 11.
- the nacelle 12 is mounted at the top of the tower 11.
- the nacelle 12 is mounted rotatable with regard to the tower 11 by means of a yaw bearing.
- the axis of rotation of the nacelle 12 with regard to the tower 11 is referred to as the yaw axis.
- the wind turbine 10 also comprises a hub 13 with three rotor blades 20 (of which two rotor blades 20 are depicted in Figure 1) .
- the hub 13 is mounted rotatable with regard to the nacelle 12 by means of a main bearing.
- the hub 13 is mounted rotatable about a rotor axis of rotation 14.
- the wind turbine 10 furthermore comprises a main shaft, which connects the hub 13 with a rotor of a generator 15.
- the hub 13 is connected directly to the rotor, thus the wind turbine 10 is referred to as a gearless, direct driven wind turbine.
- the hub 13 may also be connected to the rotor via a gearbox. This type of wind turbine is referred to as a geared wind turbine.
- the generator 15 is accommodated within the nacelle 12. It comprises the rotor and a stator. The generator 15 is arranged and prepared for converting the rotational energy from the rotor into electrical energy.
- FIG. 2 shows a rotor blade 20 of a wind turbine.
- the rotor blade 20 comprises a root section 21 with a root 211 and a tip section 22 with a tip 221.
- the root 211 and the tip 221 are virtually connected by the span 26 which follows the shape of the rotor blade 20. If the rotor blade were a rectangular shaped object, the span 26 would be a straight line. However, as the rotor blade 20 features a varying thickness, the span 26 is slightly curved or bent as well. Note that if the rotor blade 20 was bent itself, then the span 26 would be bent, too.
- the rotor blade 20 furthermore comprises a leading edge section 24 with a leading edge 241 and a trailing edge section 23 with a trailing edge 231.
- the trailing edge section 23 surrounds the trailing edge 231.
- the leading edge section 24 surrounds the leading edge 241.
- chord line 27 which connects the leading edge 241 with the trailing edge 231 can be defined. Note that the chord line 27 is perpendicular to the span 26.
- the shoulder 28 is defined in the region where the chord line comprises a maximum chord length.
- the rotor blade 20 can be divided into an in- board section which comprises the half of the rotor blade 20 adjacent to the root section 21 and an outboard section which comprises the half of the rotor blade 20 which is adjacent to the tip section 22.
- Figures 3A and 3B show a first embodiment of an aerodynamic device 32 which is mounted and attached to a rotor blade body 31 of a rotor blade. Specifically, in Figures 3A and 3B two aerodynamic devices 32 are shown, which are spaced apart.
- Figure 3A shows the rotor blade in an unloaded state. In other words, the rotor blade is loaded by a load which is smaller than the critical load. Note that the critical load is defined as the threshold value where parts of the aerodynamic device 32 are deflected. In Figure 3A no deflection of the aerodynamic device 32 occurs.
- the aerodynamic devices 32 are mounted at the trailing edge section 23 of the rotor blade.
- Figures 3A and 3B show a perspective view on a part of the rotor blade regarding at the suction side 252 of the rotor blade. Note that the pressure side 251 of the rotor blade is opposite to the suction side 252.
- Figure 3B shows the same rotor blade as in Figure 3A but in a loaded state, i.e. in a state where the rotor blade is loaded with a load that exceeds the critical load.
- a first portion 321 of the aerodynamic device 32 is still firmly attached and connected with the rotor blade body 31 of the rotor blade.
- a second portion 322 now is misaligned with the rotor blade body 31 thus the aerodynamic device 32 is partly deflected. This deflection of the aerodynamic device 32 has the consequence that the wind flow is deflected in such a manner that the lift and the load of the rotor blade are decreased.
- FIGS 4A and 4B show a second embodiment of an aerodynamic device 32.
- the difference to the first embodiment is that serrations 35 are added to the flap which incorporates the aerodynamic device 32.
- the serrations 35 have the advantage that noise which is generated by the rotor blade is reduced and/or efficiency of the rotor blade is increased.
- FIGS 5A and 5B show a third embodiment of an aerodynamic device 32.
- the aerodynamic device 32 which is shaped as a Gurney flap is attached to the trailing edge section 23 of the rotor blade at the pressure side 351.
- FIG. 5A shows four aerodynamic devices 32 which are aligned adjacent to each other along the trailing edge of the rotor blade.
- Each of the aerodynamic devices comprises a first portion 321 and a second portion 322.
- the aerodynamic device 32 In an unloaded state of the rotor blade, the aerodynamic device 32 is fully aligned with the trailing edge of the rotor blade.
- wind flow that is flowing from the leading edge section 24 to the trailing edge section 23 on the pressure side 251 is deflected such that lift of the rotor blade is increased.
- FIG. 5B shows three aerodynamic devices 32 aligned one next to each other along the trailing edge of the rotor blade.
- Each of the aerodynamic devices comprises a first portion 321 which is firmly attached to the trailing edge section 23 of the rotor blade.
- the second portion 322 of the aerodynamic device is deflected leading to a misalignment of the second portion 322 with regard to the trailing edge 231. The deflection occurs in parallel with the wind flow flowing from the leading edge section 24 to the trailing edge section 23.
- a technical effect of the deflection of the second portion 322 of the aerodynamic device 32 is that the lift enhancement effect of the aerodynamic device 32 is reduced.
- the lift enhancement of the rotor blade is reduced, but also the loading of the rotor blade is reduced.
- Figures 6A to 6C illustrate a fourth embodiment of an aerodynamic device 32.
- Figure 6A shows a plurality of aerodynamic devices 32 spaced apart from each other and located at a trailing edge section 23 of a rotor blade. In an unloaded state of the rotor blade, which is shown in Figure 6A, the aerodynamic devices 32 are flush with the rotor blade body 31 of the rotor blade.
- Figure 6B shows a loaded state of the rotor blade where the load exceeds the critical load.
- a rotation of the aerodynamic devices 32 is activated.
- these aerodynamic devices 32 are no longer flush with the rotor blade body, in particular with the trailing edge 231.
- a wind flow flowing from the leading edge section 24 to the trailing edge section 23 is disturbed in such a manner that the lift of the rotor blade is reduced.
- each aerodynamic device is substantially parallel to the chord line 27 of the rotor blade. If the axis of rotation 33 of the aerodynamic device 32 were coinciding with an axis of rotational symmetry 34 of the aerodynamic device 32, then no direction of rotation would be preferred. However, in Figure 6A the aerodynamic de- vices 32 are arranged such that the axis of rotation 33 and the axis of rotational symmetry 34 do not coincide. This has the effect that a direction of rotation at least a preferred direction of rotation is predetermined.
- Figure 6A shows a first option where the aerodynamic devices 32 are hinged such that counter-rotating pairs of aerodynamic devices result.
- Figure 6C shows another option where all aerodynamic devices 32 are hinged in a similar manner so that they all have the same preferred direction of rotation. Note that in the embodiments of Figures 3A, 3B, 4A, 4B, 6A, 6B and 6C a torque in substantially chordwise direction is generated, while in the embodiments of Figures 5A and 5B a torque in substantially flapwise direction is generated.
- Figure 7A shows a first preferred location where the aerodynamic device 32 is preferably located on the rotor blade. More specifically, Figure 7A shows a preferred location outboard at the trailing edge section 23 of the rotor blade.
- Figure 7B shows another preferred location of the aerodynamic devices 32. Additionally to the outboard location a second location approximately in the spanwise center of the rotor blade is disclosed. Finally Figure 7C shows a continuous placement of aerodynamic devices 32 along almost the entire trailing edge section 23, from the shoulder of the rotor blade until almost the tip of the rotor blade.
- Figure 8 shows a dependency of the lift coefficient CL with regard to the angle of attack AoA of the rotor blade.
- a first curve 41 shows a conventional rotor blade without any aerodynamic devices as described in this patent application. It can be seen that during a large range of considered angle of attacks AoA the lift coefficient increases. The point where the lift coefficient has its maximum may be referred to a maximum loading of the rotor blade.
- the curve 42 shows a rotor blade with an aerodynamic device as described in this patent application. It can be seen that the lift coefficient is the same for small angle of attacks AoA but deviates from the first curve 41 for high angle of attacks AoA.
- the second curve 42 deviates in a way that the lift coefficient is reduced for high angles of attack AoA. Particularly, the maximum of the second curve 42 is considerably smaller than the maximum of the first curve 41. This results in a reduced maximum loading of the rotor blade. This is advantageous with regard to for example the structural requirements of the rotor blade or the range in which the wind turbine can be operated.
- This third curve 43 represents a rotor blade with an aerodynamic device as described in this patent application. It can be seen that the third curve 43 deviates from the first curve representing a conventional rotor blade in the whole range of considered angles of attack AoA.
- the third curve 43 has an increased lift coefficient CL for small angles of attack AoA, but a reduced lift coefficient for high angles of attack AoA. This is a highly advantageous behavior as for small loading the lift coefficient is increased while for a high loading of the rotor blade where a further loading due to the aerodynamic device is not desired this lift coefficient is reduced.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14169666 | 2014-05-23 | ||
PCT/EP2015/057802 WO2015176868A1 (fr) | 2014-05-23 | 2015-04-10 | Dispositif aérodynamique d'une pale de rotor d'une éolienne |
Publications (1)
Publication Number | Publication Date |
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EP3146201A1 true EP3146201A1 (fr) | 2017-03-29 |
Family
ID=50771193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15716486.4A Withdrawn EP3146201A1 (fr) | 2014-05-23 | 2015-04-10 | Dispositif aérodynamique d'une pale de rotor d'une éolienne |
Country Status (2)
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EP (1) | EP3146201A1 (fr) |
WO (1) | WO2015176868A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10612517B2 (en) | 2017-03-09 | 2020-04-07 | General Electric Company | Flexible extension for wind turbine rotor blades |
CN111379662A (zh) * | 2018-12-29 | 2020-07-07 | 中材科技风电叶片股份有限公司 | 风电叶片及风机 |
CN112128050B (zh) * | 2020-10-29 | 2022-02-11 | 上海电气风电集团股份有限公司 | 降噪结构、叶片及风力发电机组 |
EP4080039A1 (fr) * | 2021-04-19 | 2022-10-26 | Siemens Gamesa Renewable Energy A/S | Pale de turbine éolienne et éolienne |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2937558A1 (fr) * | 2014-04-23 | 2015-10-28 | Siemens Aktiengesellschaft | Dispositif de déviation d'écoulement d'une éolienne |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DK200300670A (da) * | 2003-05-05 | 2004-11-06 | Lm Glasfiber As | Vindmölleving med opdriftsregulerende organer |
EP2336555A1 (fr) * | 2009-12-14 | 2011-06-22 | Lm Glasfiber A/S | Volet actif magnétique |
US9033661B2 (en) * | 2012-02-15 | 2015-05-19 | General Electric Company | Rotor blade assembly for wind turbine |
-
2015
- 2015-04-10 WO PCT/EP2015/057802 patent/WO2015176868A1/fr active Application Filing
- 2015-04-10 EP EP15716486.4A patent/EP3146201A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2937558A1 (fr) * | 2014-04-23 | 2015-10-28 | Siemens Aktiengesellschaft | Dispositif de déviation d'écoulement d'une éolienne |
Non-Patent Citations (1)
Title |
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See also references of WO2015176868A1 * |
Also Published As
Publication number | Publication date |
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WO2015176868A1 (fr) | 2015-11-26 |
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