GB2588258A - Wind turbine blade with a flow controlling element - Google Patents

Wind turbine blade with a flow controlling element Download PDF

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Publication number
GB2588258A
GB2588258A GB2004396.4A GB202004396A GB2588258A GB 2588258 A GB2588258 A GB 2588258A GB 202004396 A GB202004396 A GB 202004396A GB 2588258 A GB2588258 A GB 2588258A
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GB
United Kingdom
Prior art keywords
vortilon
blade
projecting
wind turbine
lateral surface
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Withdrawn
Application number
GB2004396.4A
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GB202004396D0 (en
Inventor
Hertel Nilsson Van Kalken Jordy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LM Wind Power AS
Original Assignee
LM Wind Power AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LM Wind Power AS filed Critical LM Wind Power AS
Priority to GB2004396.4A priority Critical patent/GB2588258A/en
Publication of GB202004396D0 publication Critical patent/GB202004396D0/en
Publication of GB2588258A publication Critical patent/GB2588258A/en
Withdrawn legal-status Critical Current

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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
    • F03D1/0608—Rotors characterised by their aerodynamic shape
    • F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
    • 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
    • F05B2240/12—Fluid guiding means, e.g. vanes
    • F05B2240/122—Vortex generators, turbulators, or the like, for mixing
    • 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
    • F05B2240/303—Details of the leading edge
    • 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
    • F05B2240/306—Surface measures
    • F05B2240/3062—Vortex generators
    • 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

Abstract

A wind turbine blade 10 comprises a root end 17 and a tip end 15, and a pressure side and a suction side extending between a leading edge 18 and a trailing edge 20, and a number of spaced flow-controlling vortilons 44 on the pressure side of the blade. The vortilons 44 each comprise a part 46 which projects forwardly of the leading edge 18 of the blade 10, a lateral surface 52, and a leading vortilon edge 50. The lateral surface 52 of the projecting vortilon part 46 is angled by an angle A relative to the local chord plane of the blade, at least over the projecting part 46, in order to divert the impacting local air flow. The vortilons 44 may have a rounded or pointed leading edge 50 and may be thin-walled, eg of plastic material. Additional non-angled vortilons (54, fig.6) may also be provided.

Description

Wind turbine blade with a flow controlling element Field of the Invention The present invention relates to a wind turbine blade provided with a flow controlling element.
Background of the Invention
It is known to provide wind turbine blades with a flow controlling element such as e.g. a vortex generator or stall fences on the suction side of the blade. These elements may have a negative side effect on the performance of the blade. Stall fences prevent formation of crossflows along the longitudinal direction of the blade, however, low pressure areas are formed in the wake of the stall fences towards the trailing edge of the blades, resulting in flow separation and resulting in a reduction in blade performance. Vortex generators provide vortexes propagating along the suction side of the blade and pulling faster flowing air from the free air stream into the boundary layer so as to avoid flow separation and premature stall.
However, vortex generators will add additional drag, also in the operating range when their positive effect on lift is not required, i.e. at low angles of attack.
Summary of the Invention
The present invention provides a wind turbine blade for a rotor of a wind turbine having a root end and a tip end as seen in a longitudinal direction along a longitudinal axis of the blade and a transverse direction transversely of the longitudinal direction, the blade further comprises a pressure side and a suction side extending between a leading blade edge and a trailing blade edge, as well as a local chord having a chord length C of a local section of the blade and extending between the leading blade edge and the trailing blade edge and a chord plane extending through the chord perpendicularly to the longitudinal axis of the blade, the wind turbine blade additionally comprises at least one vortilon provided on the pressure side of the blade, wherein the vortilon comprises a projecting vortilon part projecting forward of the leading blade edge and a first lateral surface and a leading vortilon edge, the first lateral surface of the projecting vortilon part being at least over a portion of the extend thereof angled by an angle A relative to the local chord plane of the blade in order to divert the impacting local air flow, the vortilon preferably additionally comprises a trailing vortilon part extending rearwardly of the leading blade edge in continuation of the projecting vortilon part.
The projecting vortilon part projects in upstream direction forward of a plane through the leading blade edge perpendicular to the local chord and the air flow impacting the angled portion of the first lateral surface of the projecting vortilon part creates a vortex traveling over the suction side of the blade keeping the air flow attached to the suction side of the blade and thereby reducing or preventing local stall and increasing the effectiveness of the blade. As per design the vortilon will have a lower impact on drag than vortex generators, especially in the operating range where the vortilons are not required to have a positive effect on lift i.e. at low angles of attack. Vortilons affect only the targeted operation angles of attack and therefore minimize the drag impact on the operating angles outside the targeted angles of attack. Additionally, a sudden drop in lift at stall can be avoided, thereby stall induced vibrations are reduced and the operation is stabilised, and the effective angle of attack can be increased, and the power output thereby increased. Additionally, vortilons can advantageously be retrofitted to blades by being adhesively attached to the surface thereof.
The trailing vortilon part advantageously extends essentially in the local chord plane or essentially in a plane forming the angle A with the local chord plane.
The angled portion of the lateral surface of the projecting vortilon part can be a leading portion of the first lateral surface of the projecting vortilon part.
The first lateral surface can over the entire extend of the projecting vortilon part form the angle A with the local chord plane of the blade.
The angle A can be between 1° and 25°, The angle A can be between 2° and 15°, 2° and 10° or 3° and 8°.
The angled portion of the first lateral surface can be planar over the extend of the projecting vortilon part.
Thus, the first lateral surface forms a constant angle A with the local chord plane of the blade.
The angled portion of first lateral surface can be convex curved over the extend of the projecting vortilon part.
The angle A can be measured as the angle between the tangent plane at the leading edge of the curved portion of the first lateral surface of the projecting vortilon part and the local chord plane.
The projecting vortilon part can have a length P of 10/0 to 150/0, such as 1°/c, to 100/0 of the local chord length C as measured along the local chord.
The angled portion of the first lateral surface can have a length p of 10% to 100% of the length P of the projecting vortilon part as measured along the local chord.
The projecting length of the projecting vortilon part can decrease as seen in the longitudinal direction from the root end towards the tip end.
Correspondingly, the height of the projecting vortilon part as measured perpendicular to the surface of the pressure side of the blade decreases as seen in the longitudinal direction from the root end towards the tip end.
The projecting vortilon part can extend up to the leading edge of the blade. The extend of the projecting vortilon part will depend on the specific operation conditions and airfoil geometry. It is preferred that the front part or leading edge of the vortilon extends above the stagnation point at the angles of attack where the vortilon is supposed to work. When the angles get smaller the stagnation point moves upwards outside the vortilon influenced area. As a result, the vortilon has no influence on the suction side of the airfoil. Thereby, the drag is not increased on the suction side of the airfoil which is the case of a vortex generator on the suction side.
The angled portion of the first lateral surface of the projecting vortilon part can be angled so as to divert the impacting air flow in the direction of the tip end of the blade.
At least one or a number of vortilons of the above type can be arranged at any position of the pressure side of the blade, advantageously in the outer 600/n of the length of the blade as seen in the longitudinal direction of the blade.
The angled portion of the first lateral surface of the projecting vortilon part can be angled so as to divert the impacting air flow in the direction of the root end of the blade.
At least one or a number of the vortilons of the above type can be arranged at any position of the pressure side of the blade, advantageously in the outer 60% of the length of the blade as seen in the longitudinal direction of the blade.
The leading edge of the projecting vortilon part can have a rounded shape, such as an essentially circular shape.
The leading edge of the projecting vortilon part can have a pointed shape, such as being essentially wedge-shaped.
A wind turbine blade according to the invention can as seen perpendicular to the pressure side comprise a wedge-shaped projecting vortilon part projecting forward of the leading blade edge and in addition to the first lateral surface a second lateral surface arranged opposite the first lateral surface, the first and second lateral face intersecting each other in the leading vortilon edge in a local chord plane, the second lateral surface being optionally symmetrical with the first lateral surface about the local chord plane being a symmetry plane of the vortilon.
The vortilon can comprise a vortilon base attached to the pressure side of the blade and a plate-shaped vortilon web extending outwardly from the base and comprising the first lateral surface and optionally also the second lateral surface.
The wind turbine blade according to the invention can comprise a plurality of vorUlons being arranged mutually spaced as seen in the longitudinal direction of the blade.
Additionally, a wind turbine blade according to the invention can comprise at least one vortilon having a projecting vortilon part projecting forward of the leading blade edge, the projecting vortilon part extending essentially along the local chord plane and being without any angled lateral surface.
Brief Description of the Figures
The invention is explained in detail below with reference to embodiments or examples shown in the drawings, in which Fig. 1 is a diagrammatical perspective view of an exemplary wind turbine, Fig. 2 is a diagrammatical perspective view of an exemplary wind turbine blade according to the present invention, Fig. 3 is a diagrammatical side view of a blade according to the invention provided with a vortilon having a rounded leading vortilon edge, Fig. 4 is a diagrammatical side view of a blade according to the invention provided with a vortilon having a pointed leading vortilon edge, Fig. 5, 6 and 7 are enlarged diagrammatical perspective views of examples of vortilons arranged on the pressure side of a blade, Fig. 8 is a diagrammatical illustration of a vortilon similar to the vortilon shown in Fig. 5; in the upper view as seen towards the pressure side of a blade and in the lower view as seen towards the leading edge of the blade, Fig. 8a is a modification of the vortilon shown in Fig. 8; in the upper view as seen towards the pressure side of a blade and in the lower view as seen towards the leading edge of the blade, Fig. 8b is a modification of the vortilon shown in Fig. 8; in the upper view as seen towards the pressure side of a blade and in the lower view as seen towards the leading edge of the blade, Fig. 9 is a diagrammatical illustration of a vortilon similar to the vortilon shown in Fig. 6; in the upper view as seen towards the pressure side of a blade and in the lower view as seen towards the leading edge of the blade, Fig. 10 is a diagrammatical illustration of a vortilon similar to the vortilon shown in Fig. 7; in the upper view as seen towards the pressure side of a blade and in the lower view as seen towards the leading edge of the blade, Fig. 10a is a modification of the vortilon shown in Fig. 10; in the upper view as seen towards the pressure side of a blade and in the lower view as seen towards the leading edge of the blade, and Fig. 11 is a diagrammatical illustration of a vortilon; in the upper view as seen towards the pressure side of a blade and in the lower view as seen towards the leading edge of the blade,
Detailed Description of the Invention
The invention is explained below with reference to embodiments shown in the drawings, in which Fig. 1 illustrates a conventional modern upwind wind turbine 2 according to the so-called "Danish concept" with a tower 4, a nacelle 6 and a rotor with a substantially horizontal rotor shaft. The rotor includes a hub 8 and three blades 10 extending radially from the hub 8, each having a blade root 16 nearest the hub and a blade tip 14 furthest from the hub 8.
Fig. 2 shows a schematic view of an exemplary wind turbine blade 10. The wind turbine blade 10 has the shape of a conventional wind turbine blade with a root end 17 and a tip end 15 as seen in a longitudinal direction along a longitudinal axis of the blade and a transverse direction transversely of the longitudinal direction. The blade comprises a root region 30 closest to the hub, a profiled or an airfoil region 34 furthest from the hub and a transition region 32 between the root region 30 and the airfoil region 34. Additionally, the blade 10 comprises a leading edge 18 facing the direction of rotation of the blade 10, when the blade is mounted on the hub, and a trailing edge 20 facing the opposite direction of the leading edge 18 and a local chord 28 having a chord length C as well as a chord plane extending through the local chord 28 perpendicular to the longitudinal axis L of the blade. Further, the blade 10 comprises a number of vortilons 44 provided on the pressure side of the blade. The vortilons 14 comprise a projecting vortilon part 46 projecting forward of the leading blade edge 18 and a trailing vortilon part 48 extending rearwardly of the leading blade edge 18 in continuation of the projecting vortilon part 46. The number of vortilons 44 are arranged mutually spaced as seen in the longitudinal direction of the blade in the airfoil region 34 of the blade at the tip end and at the root end and in the transition region 32 of the blade. The size of the vortilons 44 and of the projecting vortilon part 46 thereof can decrease as seen in the longitudinal direction of the blade from the root end towards the tip end. However, it should be noted that vortilons can be arranged at any portion of the blade as seen in the longitudinal direction of the blade.
The airfoil region 34 (also called the profiled region) has an ideal or almost ideal blade shape with respect to generating lift, whereas the root region 30 due to structural considerations has a substantially circular or elliptical cross-section, which for instance makes it easier and safer to mount the blade 10 to the hub.
The diameter (or the chord) of the root region 30 may be constant along the entire root region 30. The transition region 32 has a transitional profile gradually changing from the circular or elliptical shape of the root region 30 to the airfoil profile of the airfoil region 34. The chord length of the transition region 32 typically increases with increasing distance from the hub. The airfoil region 34 has an airfoil profile with a chord 28 extending between the leading edge 18 and the trailing edge 20 of the blade 10. The length C of the chord decreases with increasing distance from the hub. A shoulder 40 of the blade 10 is defined as the position, where the blade 10 has its largest chord length C. The shoulder 40 is typically provided at the boundary between the transition region 32 and the airfoil region 34.
It should be noted, that the chords of the different sections of the blade normally do not lie in a common plane, since the blade may be twisted and/or curved (i.e. pre-bent), thus providing the chord plane with a correspondingly twisted and/or curved course, this being most often the case in order to compensate for the local velocity of the blade being dependent on the radius from the hub.
The wind turbine blade 10 can typically comprise a blade shell comprising two blade shell parts or half shells, a first blade shell part and a second blade shell part, typically made of fibre-reinforced polymer.
The wind turbine blade 10 may comprise additional shell parts, such as a third shell part and/or a fourth shell part. The first blade shell part is typically a pressure side 24 or upwind blade shell part. The second blade shell part is typically a suction side 26 or downwind blade shell part. The first blade shell part and the second blade shell part are fastened together with adhesive, such as glue, along bond lines or glue joints extending along the trailing edge 20 and the leading edge 18 of the blade 10. Typically, the root ends of the blade shell parts have a semi-circular or semi-oval outer cross-sectional shape. The blade shell parts define the aerodynamic shape of the wind turbine blade.
As shown in Fig. 3 and Fig. 4 the projecting vortilon part 46 of the vortilon 44 projects a length P forward of the leading blade edge 18. The length P is in the drawings typically shown about 10/c. to 5°/o of the length C of the local chord. The vortilon shown in Fig. 3 has a leading vortilon edge 50 having a rounded shape and being as shown essentially circular, while the vortilon shown in Fig. 4 has a pointed shape and being as shown essentially wedge shaped. Additionally, Fig. 3 and Fig. 4 show in dotted lines vortilons 44 extending up to the leading edge 18 of the blade 10. The extend of the projecting vortilon part will depend on the specific operation conditions and airfoil geometry. It is preferred that the front part or leading edge of the vortilon extends above the stagnation point at the angles of attack where the vortilon is supposed to work. When the angles get smaller the stagnation point moves upwards outside the vortilon influenced area. As a result, the vortilon has no influence on the suction side of the airfoil. Thereby the drag is not increased on the suction side of the airfoil. The projecting vortilon part 46 has a first lateral surface 52 that over the entire extend thereof is angled by an angle A relative to the local chord plane through the local chord in order to divert the impacting air flow, as more clearly shown in Fig. 5 and Fig. 7. In the examples shown the angle A is typically 2° to 5°. The trailing vortilon part 48 extends in the local vortilon plane of the local chord. The first lateral surface 52 can be angled to divert the impacting air flow towards the tip end 15 of the blade as show in Fig. 7 where the arrow T indicates the direction towards the tip end, or towards the root end 17 of the blade as shown in Fig. 5, where the arrow R indicates the direction towards the root end 17. As shown in Fig. 6 the wind turbine blade 10 may in addition to at least one vortilon having a projecting vortilon part having a first lateral surface being angled at least over a portion of the extend thereof, comprise a different vortilon 54 without any angled projecting vortilon part 56 and where the projecting vortilon part 56 and the trailing vortilon part 58 extend essentially in the local chord plane of the local chord.
Reference is now made to Fig. 8 to Fig. 10 disclosing diagrammatical illustrations of various vortilons as seen towards the pressure side 24 of the blade and as seen towards the leading edge of the blade in the direction of the chord plane of the local chord 28, the leading vortilon edge 50 of the projecting vortilon part 46 of the vortilon 44. The leading vortilon edge 50 is hatched to distinguish the leading vortilon edge from the rest of the vortilon. The vortilons are in the examples shown thin-walled and made of a plastic material, such as by injecting moulding, 3D printing or possibly by additive manufacturing methods. The projecting vortilon part of the shown vortilons extends towards the suction side 26 of the blade as shown in the lower parts of the figures.
Fig. 8 discloses a vortilon 44 similar to the vortilon 44 shown in Fig. 5 and comprises a trailing vortilon part 48 extending rearwardly of the leading blade edge 18 in the local chord plane of the local chord and a projecting vortilon part 46 projecting forward of the leading edge of the blade 10 and being angled by an angle A relative to the local chord plane of the local chord to provide a first lateral surface 52 diverting the impacting air flow towards the root end of the blade 10.
Fig. 8a discloses a rectilinear vortilon 64 having a projecting vortilon part 66 and a trailing vortilon part 68 and being arranged in a plane angled by an angle A relative to the local chord plane of the local chord. Thus, the first lateral surface 52 of the projecting vortilon part 66 is angled by an angle A relative to the chord plane and diverting the impacting air flow towards the root end of the blade 10.
Fig. 8b discloses a modified vortilon 74 comprising a trailing vortilon part 78 extending rearwardly of the leading blade edge 18 in the local chord plane of the local chord and a projecting vortilon part 76 projecting forward of the leading blade edge 18. The projecting vortilon part 76 comprises an inner portion 70 being arranged in the local chord plane, and an outer angled portion 72. The outer angled portion has in the example shown a length p being about half the length P of the projecting vortilon part. The first lateral surface 52 of the outer angled portion 72 is angled by an angle A relative to the local chord plane, so that impacting air flow is diverted towards the root end of the blade 10.
Fig. 9 discloses a different vortilon 54 similar to the vortilon shown in Fig. 6 and comprises a projecting vortilon part being rectilinear as seen towards the pressure side 24 of the blade and arranged in the local chord plane of the local chord. The different vortilon comprises a trailing vortilon part extending rearwardly of the leading blade edge 18 and a projecting vortilon part 56 projecting forward or the leading blade edge.
Fig. 10 discloses a vortilon 44 similar to the vortilon 44 shown in Fig. 7 and comprises a trailing vortilon part 48 extending rearwardly of the leading blade edge 18 in the local chord plane of the local chord and a projecting vortilon part 46 projecting forward of the leading edge of the blade 10 and being angled by an angle A relative to the local chord plane of the local chord to provide a first lateral surface 52 diverting the impacting air flow towards the tip end of the blade 10. The vortilon shown in Fig. 10 differs from that shown in Fig. 8 in that the projecting vortilon part is angled to divert impacting air flow towards tip end of the blade, whereas the projecting vortilon part of the vortilon shown in Fig. 8 is angled to divert impacting air flow towards root end of the blade.
Fig. 10a discloses a rectilinear vortilon 64 having a projecting vortilon part 66 and a trailing vortilon part 68 and being arranged in a plane angled by an angle A relative to the local chord plane of the local chord. Thus, the first lateral surface 52 of the projecting vortilon part 66 is angled by an angle A relative to the chord plane and impacting air flow is diverted towards the tip end of the blade 10. The vortilon shown in Fig. 10a differs from that shown in Fig. 8a in that the projecting vortilon part is angled to divert impacting air flow towards tip end of the blade, whereas the projecting vortilon part of the vortilon shown in Fig. 8a is angled to divert impacting air flow towards root end of the blade.
Fig.11 discloses an additional vortilon 84 comprising a projecting vortilon part 86 projecting forward of the leading blade edge 18 and a trailing vortilon part 88 extending rearward of the leading blade edge 18. The vortilon is symmetrical about a central symmetry plane 92 extending in the local chord plane of the local chord. The trailing vortilon part 88 has opposite parallel side faces, whereas the projecting vortilon part 86 has a first lateral surface 94 being angled by an angle A relative to the local chord plane and angled to divert impacting air flow towards the tip end of the blade and an opposite second lateral surface 96 angled by an angle A relative to the local chord plane and angled to divert impacting air flow towards the root end of the blade 10. The first and second lateral surfaces intersect each other in the local chord plane and form the leading vortilon edge 90.
LIST OF REFERENCE NUMERALS
2 wind turbine 4 tower 6 nacelle 8 hub blade 14 blade tip tip end 16 blade root 17 root end 18 leading blade edge 20 trailing blade edge 24 pressure side 26 suction side 28 local chord root region 32 transition region 34 airfoil region shoulder 44 vortilon 46 projecting vortilon part 48 trailing vortilon part leading vortilon edge 52 first lateral surface 54 different vortilon 56 projecting vortilon part 58 trailing vortilon part 64 rectilinear vortilon 66 projecting vortilon part 68 trailing vortilon part inner projecting vortilon portion 72 angled projecting vortilon portion 74 modified vortilon 76 projecting vortilon part 78 trailing vortilon part 84 addition vortilon 86 projecting vortilon part 88 trailing vortilon part leading vortilon edge 92 symmetry plane 94 first lateral surface 96 second lateral surface A angle * chord length longitudinal axis P projecting vortilon part length length of angled portion of P * arrow * arrow

Claims (15)

  1. Claims 1. A wind turbine blade for a rotor of a wind turbine having a root end and a tip end as seen in a longitudinal direction along a longitudinal axis of the blade and a transverse direction transversely of the longitudinal direction, the blade further comprises a pressure side and a suction side extending between a leading blade edge and a trailing blade edge, as well as a local chord having a chord length C of a local section of the blade and extending between the leading blade edge and the trailing blade edge and a chord plane extending through the chord perpendicularly to the longitudinal axis of the blade, the wind turbine blade additionally comprises at least one vortilon provided on the pressure side of the blade, wherein the vortilon comprises a projecting vortilon part projecting forward of the leading blade edge and a first lateral surface and a leading vortilon edge, the first lateral surface of the projecting vortilon part being at least over a portion of the extend thereof angled by an angle A relative to the local chord plane of the blade in order to divert the impacting local air flow, the vortilon preferably additionally comprises a trailing vortilon part extending rearwardly of the leading blade edge in continuation of the projecting vortilon part.
  2. 2. A wind turbine blade according to claim 1, wherein the angled portion of the lateral surface of the projecting vortilon part is a leading portion of the first lateral surface of the projecting vortilon part.
  3. 3. A wind turbine according to claim 1 or 2, wherein the first lateral surface over the entire extend of the projecting vortilon part forms the angle A with the local chord plane of the blade.
  4. 4. A wind turbine according to any of the preceding claims wherein the angle A is between 1° and 25°.
  5. 5. A wind turbine blade according to claim 4, wherein the angle A is between 2° and 15°, 2° and 15°, 2° and 100 or 3° and 8°.
  6. 6. A wind turbine blade according to any of the preceding claims, wherein the angled portion of the first lateral surface is planar over the extend of the projecting vortilon part.
  7. 7. A wind turbine blade according to any of the claims 1 to 5, wherein the angled portion of the first lateral surface is convex curved over the extend of the projecting vortilon part.
  8. 8. A wind turbine blade according to any of the preceding claims, wherein the projecting vortilon part has a length P of 1% to 15%, such as 1% to 100/0 of the local chord length C as measured along the local chord.
  9. 9. A wind turbine blade according to any of the preceding claims, wherein the angled portion of the first lateral surface has a length p of 100/a to 1000/0 of the length P of the projecting vortilon part as measured along the local chord.
  10. 10. A wind turbine blade according to any of the preceding claims, wherein the angled portion of the first lateral surface of the projecting vortilon part is angled so as to divert the impacting air flow in the direction of the tip end of the blade.
  11. 11. A wind turbine blade according to any of the preceding claims 1-9, wherein the angled portion of the first lateral surface of the projecting vortilon part is angled so as to divert the impacting air flow in the direction of the root end of the blade.
  12. 12. A wind turbine blade according to any of the preceding claims, wherein the leading edge of the projecting vortilon part has a rounded shape, such as essentially circular.
  13. 13. A wind turbine blade according to any of the preceding claims 1-11, wherein the leading edge of the projecting vortilon part has a pointed shape, such as essentially wedge-shaped.
  14. 14. A wind turbine blade according to any of the preceding claims comprising as seen perpendicular to the pressure side a wedge-shaped projecting vortilon part projecting forward of the leading blade edge and comprising in addition to the first lateral surface a second lateral surface arranged opposite the first lateral surface, the first and second lateral face intersecting each other in the leading vortilon edge in a local chord plane, the second lateral surface being optionally symmetrical with the first lateral surface about the local chord plane being a symmetry plane of the vortilon.
  15. 15. A wind turbine blade according to any of the preceding claims comprising a plurality of vortilons being arranged mutually spaced as seen in the longitudinal direction of the blade.
GB2004396.4A 2020-03-26 2020-03-26 Wind turbine blade with a flow controlling element Withdrawn GB2588258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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GB2588258A true GB2588258A (en) 2021-04-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865081A (en) * 2010-07-01 2010-10-20 北京大学 Device for utilizing front edge rudder pieces to adjust output power of rotating blade and method thereof
US20120051936A1 (en) * 2011-11-02 2012-03-01 Drew Eisenberg Secondary airfoil mounted on stall fence on wind turbine blade
WO2014016326A1 (en) * 2012-07-25 2014-01-30 Lm Wp Patent Holding A/S Wind turbine blade having a shaped stall fence or flow diverter
EP2801720A1 (en) * 2013-05-07 2014-11-12 General Electric Company Airflow modifying assembly for a rotor blade of a wind turbine
US20150252778A1 (en) * 2012-10-16 2015-09-10 Wobben Properties Gmbh Wind turbine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865081A (en) * 2010-07-01 2010-10-20 北京大学 Device for utilizing front edge rudder pieces to adjust output power of rotating blade and method thereof
US20120051936A1 (en) * 2011-11-02 2012-03-01 Drew Eisenberg Secondary airfoil mounted on stall fence on wind turbine blade
WO2014016326A1 (en) * 2012-07-25 2014-01-30 Lm Wp Patent Holding A/S Wind turbine blade having a shaped stall fence or flow diverter
US20150252778A1 (en) * 2012-10-16 2015-09-10 Wobben Properties Gmbh Wind turbine
EP2801720A1 (en) * 2013-05-07 2014-11-12 General Electric Company Airflow modifying assembly for a rotor blade of a wind turbine

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