CN114320736A - Wind power blade and blade dynamic stall control method thereof - Google Patents
Wind power blade and blade dynamic stall control method thereof Download PDFInfo
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- CN114320736A CN114320736A CN202210002381.1A CN202210002381A CN114320736A CN 114320736 A CN114320736 A CN 114320736A CN 202210002381 A CN202210002381 A CN 202210002381A CN 114320736 A CN114320736 A CN 114320736A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000000338 in vitro Methods 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 3
- 238000004401 flow injection analysis Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000000758 substrate Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 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
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Abstract
The invention provides a wind power blade and a blade dynamic stall control method thereof. The wind power blade comprises a blade base body and a front edge in-vitro part positioned at the front edge of the blade, wherein the front edge in-vitro part is fixedly connected with the blade base body, a gap is formed between the front edge in-vitro part and the blade base body, and an in-vitro jet flow jet groove is formed in the upper edge of the front edge in-vitro part; the blade base body is provided with a blade base body trailing edge, and the opening angle of the flap relative to the blade base body trailing edge is adjustable. The invention can reduce the trailing edge noise characteristic of the turbulent boundary layer on the upper surface of the blade and control the dynamic stall of the blade.
Description
Technical Field
The invention relates to the technical field of dynamic stall of wind turbine blades, in particular to a wind turbine blade and a dynamic stall control method of the wind turbine blade.
Background
In recent years, wind power has received much attention from various countries as a large-scale, commercially clean, renewable energy source. With the rapid development of wind power industry in China, wind turbines are continuously enlarged, wind power blades are core components for capturing wind energy of the wind turbines, and the running state of the wind power blades is directly related to the utilization efficiency of the wind energy.
At present, the stalling of the wind power blade is mainly divided into dynamic stalling and static stalling. When the included angle between the incoming wind speed and the chordwise direction of the blade exceeds a certain critical value, the lift coefficient is reduced along with the increase of the included angle, and the drag coefficient is increased instantaneously, so that the static stall of the blade is caused. The wind turbine blade is influenced by the surrounding environment in the operation process, the wind turbine blade is often in the states of shearing, yawing and variable pitch in the actual working process, and the deformation of the blade enables the wind turbine to work in an abnormal complex flow field, so that the blade generates a dynamic stall phenomenon. When the blade is in a dynamic stall state, a lift coefficient, a drag coefficient and a pitching moment coefficient all generate a hysteresis loop, and the generation of the hysteresis loop can cause strong disturbance to airflow on the surface of the blade, so that the wind energy utilization efficiency of the blade is reduced, and the blade can be damaged or subjected to safety accidents.
At present, a control method of blade dynamic stall can be divided into two modes of active control and passive control, because most of dynamic stall vortexes are formed at the leading edge of an airfoil profile, most of the control methods of the dynamic stall vortexes are used for restraining the dynamic stall vortexes at the leading edge of the airfoil profile, for example, a variable leading edge, a micro cylinder and a leading edge pasting vortex generator are additionally arranged at the leading edge, but the structure can increase blade noise.
Disclosure of Invention
The invention aims to provide a wind power blade and a dynamic stall control method of the wind power blade, which can reduce the phenomenon of dynamic stall of the blade and reduce the noise of the blade.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a wind power blade comprises a blade base body and a front edge in-vitro part located on the front edge of the blade, wherein the front edge in-vitro part is fixedly connected with the blade base body, a gap exists between the front edge in-vitro part and the blade base body, and an in-vitro jet flow jet groove is formed in the upper edge of the front edge in-vitro part;
the wind power blade further comprises a flap arranged at the rear edge of the blade base body, and the flap is arranged on the upper surface of the blade and is adjustable relative to the opening angle of the upper surface of the blade.
Further, on the spanwise section of the wind power blade, the front edge separation part is circular and tangent to the front edge point of the wind power blade.
Further, the radius of the circular front edge separation part is equal to the radius of the front edge of the wind power blade.
Furthermore, the size range of the gap is 1-2 mm.
Further, the width range of separation efflux jet-propelled groove is 1 ~ 2 mm.
Further, the flap is positioned in the position range of 60% -80% of the chord length of the blade.
Further, the length range of the flap is 10% -15% of the chord length of the blade.
Further, the flap is formed by injection molding.
Further, the flap is connected with the blade base body through a hinge.
Furthermore, the blade base body is provided with an opening clamping sleeve, a connecting shaft is nested in the opening clamping sleeve, and the flap is rotatably connected with the upper surface of the blade through the connecting shaft.
A method of dynamic stall control of a wind turbine blade as claimed in any preceding claim, comprising:
in the process that the blade is pitched through the pitching motion center, a separation jet is sprayed through the separation jet spraying groove, and the opening angle of the flap relative to the upper surface of the blade is gradually increased;
during the pitch of the blade through the centre of pitch, the jet of detached jet is stopped and the opening angle of the flap with respect to the upper surface of the blade is gradually reduced until it reaches zero degrees.
Compared with the prior art, the invention has the following advantages:
according to the wind power blade, the separated jet flow is arranged on the front edge separated part along the edge, the flap is arranged on the upper surface of the rear edge of the blade, and the trailing edge vortex shedding phenomenon of the turbulent boundary layer on the upper surface of the blade is effectively broken through the front edge separated jet flow and the opening angle between the flap and the upper surface of the blade, so that the turbulent boundary layer noise on the surface of the blade is effectively reduced, the dynamic stall phenomenon of the blade is effectively reduced, and the operation of the blade is protected.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are an embodiment of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts according to the drawings:
FIG. 1 is a schematic illustration of dynamic stall of a blade according to an embodiment of the present invention;
FIG. 2 is a schematic view of a flap opening angle at pitch on a blade according to an embodiment of the present invention;
FIG. 3 is a schematic view of an in-vitro fluidic arrangement of a leading edge of a blade provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of a flap according to an embodiment of the present invention mounted on an upper surface of a blade;
FIG. 5 is a schematic view of a flap coupled to a coupling shaft according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in fig. 1 to 5, the wind power blade provided by the invention comprises a blade substrate 2 and a front edge in-vitro part 6 located at the front edge of the blade, wherein the front edge in-vitro part 6 is fixedly connected with the blade substrate 2, a gap d exists between the front edge in-vitro part 6 and the blade substrate 2, and an in-vitro jet flow jet groove 7 is arranged on the upper edge of the front edge in-vitro part 2; the wind power blade further comprises a flap 3 arranged at the rear edge of the blade base body 2, and the flap 3 is arranged on the upper surface of the blade and is adjustable relative to the opening angle of the upper surface of the blade.
The blade presents two motion states of upward pitching and downward pitching due to the dynamic stall, and the dynamic stall control method of the wind power blade comprises the following steps: in the process that the blade is pitched through the pitching motion center 1, the separated jet flow is sprayed through the separated jet flow spraying groove 7, and the opening angle of the flap 3 relative to the upper surface of the blade is gradually increased; during the pitch down of the blade through the centre of pitch motion 1, the jet of detached jet is stopped and the opening angle of the flap 3 with respect to the upper surface of the blade is gradually reduced until it is zero degrees.
The principle of the dynamic stall control of the wind power blade is as follows:
referring to fig. 1, the process of the blade in the dynamic stall state is mainly divided into two stages, namely an upward-downward stage and a downward-upward stage, and the main motion law is as follows:
α(t)＝α0+αm·sin(2πft)
in the formula: alpha (t) is the instant incoming flow attack angle; alpha is alpha0Is the average angle of attack; alpha is alphamIs the vibration amplitude; f is the oscillation frequency; t is time.
When the blade starts pitching from a static state, when the blade starts to pitch upwards and downwards, the attack angle of incoming flow gradually increases, the separated flow area of the surface of the blade also gradually increases, the upper edge of the blade front edge separation part 6 starts to spray separation jet flow, the flap 3 starts to rotate, and the opening angle of the flap 3 on the upper surface of the blade is gradually increased. The upper edge of the blade leading edge separation part 6 sprays separation jet flow, so that the flow separation of the blade leading edge can be inhibited, and the positive vortex shed from the trailing edge in the movement process of the flap 3 is neutralized with the negative vortex shed from the upper surface of the blade, so that the flow separation vortex on the surface of the blade is reduced, the dynamic stall of the blade is controlled, and the separation vortex noise on the surface of the blade is reduced.
When the blade starts to change from the upward-pitching stage (I) to the downward-pitching stage (II), the incoming flow attack angle of the blade is gradually reduced, the separation vortex on the upper surface of the blade is also gradually reduced, the jet flow of the front edge separation part 6 is closed, the flap 3 on the upper surface of the blade is gradually closed, and the opening angle (IV) between the flap 3 and the upper surface of the blade is also gradually reduced.
Therefore, according to the wind power blade, the separation jet flow is arranged on the front edge separation part 6, the flap 3 is arranged on the upper surface of the rear edge of the blade, and the vortex shedding phenomenon of the trailing edge of the turbulent boundary layer on the upper surface of the blade is effectively broken through the front edge separation jet flow and the opening angle between the flap 3 and the upper surface of the blade, so that the noise of the turbulent boundary layer on the surface of the blade is effectively reduced, the dynamic stall phenomenon of the blade is effectively reduced, and the operation of the blade is protected.
In an embodiment, the front edge part of the wind power blade can be divided to obtain the front edge separation part 6 and the blade substrate 2, and then the front edge separation part 6 is connected with the blade substrate 2 at two ends of the blade by adopting a connecting piece mode, and meanwhile, the interval between the front edge separation part 6 and the blade substrate is kept as the gap d. In another implementation manner, the blade base body 2 and the leading edge separation portion 6 may be integrally formed in the wind turbine blade forming process, and the gap between the two is the gap d.
Optionally, on the spanwise cross section of the wind power blade, the front edge separation part 6 is circular and tangent to the front edge point of the wind power blade. Further, the radius of the circular leading edge separated part 6 is equal to the radius of the leading edge of the wind power blade.
Optionally, the size range of the gap d is 1-2 mm. The gap d should not be too large where vortices would otherwise occur.
Optionally, the width range of the separation jet flow jet groove 7 is 1-2 mm. The width of the in-vitro jet flow jet groove 7 is not large, otherwise the jet effect of the in-vitro jet flow is influenced.
Optionally, the flap 3 is arranged in a position range of 60% -80% of the chord length of the blade, and can be formed by injection molding, and the length range of the flap is 10% -15% of the chord length of the blade.
In order to facilitate the rotation of the flap 3 relative to the upper surface of the blade, the flap 3 is hinged to the blade base body 2. Specifically, the blade base body 2 is provided with an opening clamping sleeve, a connecting shaft 5 is embedded in the opening clamping sleeve in a nesting mode, and the flap 3 is rotatably connected with the connecting shaft 5, namely the flap 3 can rotate around the connecting shaft 5, so that the upper surface of the blade is rotatably connected with the upper surface of the blade through the connecting shaft 5.
In conclusion, the invention achieves the effects of reducing the trailing edge noise characteristic of the turbulent boundary layer on the upper surface of the blade and controlling the dynamic stall of the blade by arranging the separated jet flow on the separated part of the front edge and arranging the flap on the upper surface of the trailing edge of the blade.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (11)
1. The wind power blade is characterized by comprising a blade base body and a front edge in-vitro part positioned at the front edge of the blade, wherein the front edge in-vitro part is fixedly connected with the blade base body, a gap exists between the front edge in-vitro part and the blade base body, and the upper edge of the front edge in-vitro part is provided with an in-vitro jet flow jet groove;
the wind power blade further comprises a flap arranged at the rear edge of the blade base body, and the flap is arranged on the upper surface of the blade and is adjustable relative to the opening angle of the upper surface of the blade.
2. The wind blade as set forth in claim 1 wherein, in spanwise cross section of the wind blade, the leading edge off-body portion is circular and tangent to a leading edge point of the wind blade.
3. The wind blade as set forth in claim 2 wherein the radius of the rounded leading edge section is equal to the leading edge radius of the wind blade.
4. The wind blade as set forth in claim 1, wherein the clearance is in the range of 1-2 mm.
5. The wind power blade as claimed in claim 2, wherein the width of the in-vitro jet flow injection groove is in the range of 1-2 mm.
6. The wind blade of claim 1 wherein the flap is positioned within the range of 60% to 80% of the chord length of the blade.
7. The wind blade of claim 1 wherein the length of the flap is in the range of 10% to 15% of the chord length of the blade.
8. The wind turbine blade of claim 1 wherein the flap is injection molded.
9. The wind turbine blade as claimed in claim 1, wherein the flap is connected to the blade base by a hinge.
10. The wind turbine blade as claimed in claim 9, wherein the blade base body is provided with an open cutting sleeve, a connecting shaft is nested in the open cutting sleeve, and the flap is rotatably connected with the upper surface of the blade through the connecting shaft.
11. A method of dynamic stall control of a wind turbine blade according to any of claims 1 to 10, comprising:
in the process that the blade is pitched through the pitching motion center, a separation jet is sprayed through the separation jet spraying groove, and the opening angle of the flap relative to the upper surface of the blade is gradually increased;
during the pitch of the blade through the centre of pitch, the jet of detached jet is stopped and the opening angle of the flap with respect to the upper surface of the blade is gradually reduced until it reaches zero degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210002381.1A CN114320736A (en) | 2022-01-04 | 2022-01-04 | Wind power blade and blade dynamic stall control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210002381.1A CN114320736A (en) | 2022-01-04 | 2022-01-04 | Wind power blade and blade dynamic stall control method thereof |
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| Publication Number | Publication Date |
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| CN114320736A true CN114320736A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210002381.1A Pending CN114320736A (en) | 2022-01-04 | 2022-01-04 | Wind power blade and blade dynamic stall control method thereof |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0260586A2 (en) * | 1986-09-15 | 1988-03-23 | Hans-Joachim Riedelsheimer | Wing |
| US20050001104A1 (en) * | 2003-04-14 | 2005-01-06 | Gilles Arnaud | Rotary flap |
| US20070158503A1 (en) * | 2006-01-12 | 2007-07-12 | Burg Donald E | Fluid dynamic foil with Coanda energizer |
| WO2008141622A2 (en) * | 2007-05-23 | 2008-11-27 | Eads Deutschland Gmbh | Method and device for flow control on a high lift system on the airfoil of an aircraft |
| WO2008141618A2 (en) * | 2007-05-23 | 2008-11-27 | Eads Deutschland Gmbh | Method and device for reducing noise on a high lift system on the airfoil of an aircraft |
| EP2336555A1 (en) * | 2009-12-14 | 2011-06-22 | Lm Glasfiber A/S | Magnetic active flap |
| CN102137793A (en) * | 2008-08-28 | 2011-07-27 | 空中客车营运有限公司 | High lift system for an aircraft with a high lift flap and method for adjusting the high lift flap |
| CN205639000U (en) * | 2016-04-26 | 2016-10-12 | 浙江理工大学 | Blade leading edge takes axial fan that groove structure and blade root blew |
| CN107110112A (en) * | 2014-10-10 | 2017-08-29 | 维斯塔斯风力系统有限公司 | wind turbine blade with trailing edge flap |
| CN107810140A (en) * | 2015-01-24 | 2018-03-16 | 迪特尔·勒姆 | Multi-functional wing flap as backflow wing flap |
| CN112313407A (en) * | 2018-05-04 | 2021-02-02 | 通用电气公司 | Flexible extension for wind turbine rotor blade |
-
2022
- 2022-01-04 CN CN202210002381.1A patent/CN114320736A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0260586A2 (en) * | 1986-09-15 | 1988-03-23 | Hans-Joachim Riedelsheimer | Wing |
| US20050001104A1 (en) * | 2003-04-14 | 2005-01-06 | Gilles Arnaud | Rotary flap |
| US20070158503A1 (en) * | 2006-01-12 | 2007-07-12 | Burg Donald E | Fluid dynamic foil with Coanda energizer |
| WO2008141622A2 (en) * | 2007-05-23 | 2008-11-27 | Eads Deutschland Gmbh | Method and device for flow control on a high lift system on the airfoil of an aircraft |
| WO2008141618A2 (en) * | 2007-05-23 | 2008-11-27 | Eads Deutschland Gmbh | Method and device for reducing noise on a high lift system on the airfoil of an aircraft |
| CN102137793A (en) * | 2008-08-28 | 2011-07-27 | 空中客车营运有限公司 | High lift system for an aircraft with a high lift flap and method for adjusting the high lift flap |
| EP2336555A1 (en) * | 2009-12-14 | 2011-06-22 | Lm Glasfiber A/S | Magnetic active flap |
| CN107110112A (en) * | 2014-10-10 | 2017-08-29 | 维斯塔斯风力系统有限公司 | wind turbine blade with trailing edge flap |
| CN107810140A (en) * | 2015-01-24 | 2018-03-16 | 迪特尔·勒姆 | Multi-functional wing flap as backflow wing flap |
| CN205639000U (en) * | 2016-04-26 | 2016-10-12 | 浙江理工大学 | Blade leading edge takes axial fan that groove structure and blade root blew |
| CN112313407A (en) * | 2018-05-04 | 2021-02-02 | 通用电气公司 | Flexible extension for wind turbine rotor blade |
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