CN110594096B - Blade boundary layer flow control system and wind generating set comprising same - Google Patents

Blade boundary layer flow control system and wind generating set comprising same Download PDF

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Publication number
CN110594096B
CN110594096B CN201911029930.9A CN201911029930A CN110594096B CN 110594096 B CN110594096 B CN 110594096B CN 201911029930 A CN201911029930 A CN 201911029930A CN 110594096 B CN110594096 B CN 110594096B
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blade
boundary layer
control system
flow control
layer flow
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CN110594096A (en
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赵越
金孝龙
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Shanghai Electric Wind Power Group Co Ltd
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Shanghai Electric Wind Power Group Co Ltd
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    • 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
    • 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
    • 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
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022—Adjusting aerodynamic properties 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
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/20—Wind motors characterised by the driven apparatus
    • F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
    • 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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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Power Engineering (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses a blade boundary layer flow control system and a wind generating set comprising the same, wherein the blade boundary layer flow control system comprises: the fan blade is an elastic body and is provided with a suction surface, a pressure surface, a blade front edge and a blade rear edge, wherein a blade cavity is formed inside the fan blade; the first flow guide section is communicated with the blade cavity; and the second flow guide section is communicated with the first flow guide section, is arranged on one side of the suction surface close to the rear edge of the blade and is provided with a flow guide air hole. According to the invention, under the conditions of not using extra air pump, air extractor and other air flow generating equipment and not consuming extra energy, the flow control is carried out on the blade boundary layer only by utilizing the air flow generated by the elastic deformation of the fan blade in the running process of the wind turbine generator, so that the effects of inhibiting the separation of the blade boundary layer, delaying the stall of the fan blade, improving the pneumatic performance of the fan blade and improving the generating capacity of the wind turbine generator are realized.

Description

Blade boundary layer flow control system and wind generating set comprising same
Technical Field
The invention relates to a blade boundary layer flow control system and a wind generating set comprising the same.
Background
When the wind generating set operates, if the attack angle of the blade is too large, the blade can generate a boundary layer flow separation phenomenon called as blade stall, the lift force of the blade can be rapidly reduced due to the flow separation, the resistance can be rapidly increased, the aerodynamic performance of the blade can be reduced, and the power generation amount loss is serious. With the maximization of wind power blades, the requirements on the blade structure are higher and higher, and the airfoil profile with large thickness and blunt trailing edge becomes the first choice of the airfoil profile at the end of the blade root. In the operation process of the wind turbine generator, boundary layer flow separation is easy to occur in a blade root area using a large-thickness airfoil, and then three-dimensional flow along the span direction of the blade is generated, so that the aerodynamic performance of the blade is reduced.
The airfoil boundary layer flow control technology is an effective means for inhibiting boundary layer flow separation and delaying blade stall, and comprises technologies such as a vortex generator and surface blowing and sucking.
Chinese patent document CN108087193A relates to a blade, a blade synergistic system and a wind turbine generator system, in which a draft tube is embedded in a suction surface and a pressure surface of the blade, and an air pump is controlled to suck air or inject air through the draft tube based on wind speed and incoming flow attack angle, so as to achieve the purpose of flow control and further avoid stall.
Chinese patent document CN106762402A relates to a wind turbine blade flow control device based on a combined jet technology and a control method thereof, the device is provided with a high-pressure air chamber and a front edge jet orifice on the front edge of the blade, a low-pressure air chamber and a rear edge suction port on the rear edge, the high-pressure air chamber is connected with the front edge jet orifice, the low-pressure air chamber is connected with the rear edge suction port, the high-pressure air chamber and the low-pressure air chamber are connected with an air pump device, and through the combination of the front edge jet orifice and the rear edge suction, the cut-in speed of the blade can be effectively reduced, the.
According to the scheme, extra air flow generating equipment such as an air pump and an air extractor is needed to blow and suck air to the surface of the blade, extra electric energy is consumed, and if the energy consumed by the air flow generating equipment such as the air pump and the air extractor is more than the generated energy increased by the wind turbine generator through the flow control means, energy loss is caused, and the significance of increasing work is lost.
Disclosure of Invention
The invention aims to overcome the defects that in the prior art, extra electric energy is consumed for blowing and sucking air to the surface of a blade, energy loss is caused, and the significance of power increase is lost, and provides a blade boundary layer flow control system and a wind generating set comprising the same.
The invention solves the technical problems through the following technical scheme:
a blade boundary layer flow control system, comprising:
the fan blade is an elastic body and is provided with a suction surface, a pressure surface, a blade root end, a blade tip end, a blade front edge and a blade rear edge, wherein a blade cavity is formed inside the fan blade;
the first flow guide section is communicated with the blade cavity;
the second flow guide section is communicated with the first flow guide section and is arranged on one side, close to the trailing edge of the blade, of the suction surface, and provided with a flow guide air hole, wherein when the blade cavity is contracted, internal air is sprayed out of the flow guide air hole, and when the blade cavity is expanded, external air is sucked in from the flow guide air hole.
The blade boundary layer flow control system provided by the invention utilizes the gas flow generated by the elastic deformation of the fan blade in the operation process of the wind generating set to blow and suck the gas in the blade boundary layer. When the internal volume of the blade cavity is reduced, the extruded air can flow through the first flow guide section, is sprayed out from the second flow guide section to the flow guide air holes, and is injected with high-energy gas into the boundary layer by blowing, so that the boundary layer is further developed towards the rear edge, the boundary layer separation is delayed, the load of the fan blade is reduced, the pneumatic performance of the fan blade is improved, and the power generation is improved;
when the internal volume of the blade cavity is increased, external air is sucked into the blade cavity from the guide air holes of the second guide section by the low pressure in the blade cavity, and low-energy gas in a blade boundary layer is sucked into the blade cavity, so that external high-energy gas is supplemented into the boundary layer, the boundary layer can be further developed towards the rear edge, the boundary layer separation is delayed, the blade load is reduced, the pneumatic performance of the fan blade is improved, and the generating capacity is improved.
Therefore, the boundary layer flow control system can perform flow control on the boundary layer of the blade by only utilizing the airflow change generated by the elastic deformation of the fan blade in the running process of the wind turbine generator set without using additional airflow generation equipment such as an air pump and an air extractor and without additionally consuming energy, thereby realizing the effects of inhibiting the separation of the boundary layer of the blade, delaying the stall of the fan blade, improving the pneumatic performance of the fan blade and improving the power generation capacity of the wind turbine generator set.
Preferably, a blade root baffle is arranged inside the blade root end, a vent hole and a manhole cover are arranged on the blade root baffle, and the first flow guide section is communicated with the blade cavity through the vent hole. Through the setting of the air vent on the blade root baffle, the shell of the fan blade can be prevented from being perforated, and therefore the structural strength of the fan blade cannot be reduced. The vent hole is used as the only inlet and outlet of the airflow in the blade cavity and is connected with the first flow guide section.
Preferably, the blade root end is connected to the hub, and the first flow guide section is wound out from the inside of the hub to the outer side of the blade root end and communicated with the second flow guide section. The first flow guide section bypasses the hub, and extension between the inner side and the outer side of the blade root end is achieved.
Preferably, the first flow guiding section is a soft pipe, the second flow guiding section is a hard pipe, wherein one end of the second flow guiding section is connected with the first flow guiding section, and the other end of the second flow guiding section is sealed. The soft tube facilitates extension of the first flow guide section between the inner side and the outer side of the root end of the blade.
Preferably, the second flow guide section extends from the root end towards the tip end. Therefore, the covering distance of the second guide section along the longitudinal direction of the fan blade can be increased, particularly, the phenomenon of boundary layer flow separation is easily generated at the end of the blade root, and therefore the aerodynamic performance can be obviously improved.
Preferably, the ventilation hole has a raised portion relative to the root baffle, and the raised portion is in sealing connection with the first flow guide section.
Preferably, one side of the suction surface, which is close to the trailing edge of the blade, is provided with the second guide section, and one side of the suction surface, which is close to the leading edge of the blade, is provided with the second guide section or the vortex generator. The second guide section and the vortex generator which are arranged close to one side of the front edge of the blade can further improve the aerodynamic performance of the fan blade.
Preferably, the length of the second flow guiding section near the trailing edge of the blade is the same as the length of the second flow guiding section or the vortex generator near the leading edge.
Preferably, the length of the second guide section is 0-50% of the total length of the fan blade.
Preferably, a plurality of rows of the second guide sections are arranged on one side of the suction surface close to the trailing edge of the blade. The multiple rows of the second guide sections can further reduce the phenomenon of boundary layer flow separation, so that the aerodynamic performance can be obviously improved.
Preferably, the second guide section has a first surface facing upward and a second surface facing the trailing edge of the blade, wherein the first surface is streamlined, and the guide air holes are disposed on the second surface. The streamlined first surface minimizes its effect on the aerodynamic profile of the fan blade. The orientation of the second surface enables the blowing and sucking air of the diversion air holes to act on the boundary layer more accurately.
Preferably, the angle formed by the normal direction of the second surface and the tangential direction of the suction surface facing the trailing edge direction of the blade is in the range of 0 ° to 45 °.
Preferably, the second flow guide section is attached to the suction surface through a double-sided tape or an adhesive layer, the thickness of the double-sided tape or the adhesive layer is less than 1mm, and the height of the second flow guide section in the normal direction of the suction surface is less than 10 mm. Therefore, the height of the second guide section is reduced as much as possible, and the influence on the aerodynamic shape of the fan blade is reduced.
A wind park according to any of the preceding claims, characterised in that the wind park comprises the blade boundary layer flow control system.
The positive progress effects of the invention are as follows: the boundary layer flow control system can perform flow control on the boundary layer of the blade by only utilizing the air flow generated by the elastic deformation of the fan blade in the running process of the wind turbine generator set under the conditions of not using additional air pump, air extractor and other air flow generating equipment and not additionally consuming energy, thereby realizing the effects of inhibiting the separation of the boundary layer of the blade, delaying the stall of the fan blade, improving the pneumatic performance of the fan blade and improving the generating capacity of the wind turbine generator set.
Drawings
FIG. 1 is a schematic top view of a blade boundary layer flow control system according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a fan blade according to embodiment 1 of the present invention.
FIG. 3 is a schematic side view of a blade boundary layer flow control system according to embodiment 1 of the present invention.
Fig. 4 is a schematic cross-sectional view of a second flow guide section in embodiment 1 of the present invention.
Fig. 5 is a schematic structural view of a blade root baffle of a fan blade according to embodiment 1 of the present invention.
Fig. 6 is a schematic view of connection of a root end of a fan blade according to embodiment 1 of the present invention.
Fig. 7 is a schematic structural view of a wind turbine generator system according to embodiment 1 of the present invention.
FIG. 8 is a schematic top view of a blade boundary layer flow control system according to embodiment 2 of the present invention.
FIG. 9 is a schematic side view of a blade boundary layer flow control system according to embodiment 2 of the present invention.
FIG. 10 is a schematic top view of a blade boundary layer flow control system according to embodiment 3 of the present invention.
FIG. 11 is a schematic side view of a blade boundary layer flow control system according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1-7, the present embodiment discloses a blade boundary layer flow control system, wherein the blade boundary layer flow control system includes a fan blade, a first guide section and a second guide section.
As shown in fig. 1 and 3, the blade boundary layer flow control system of the present embodiment includes a fan blade 1, where the fan blade 1 is an elastic body and has a suction surface 13, a pressure surface 14, a root end 16, a tip end 15, a leading edge 11, and a trailing edge 12, and a blade cavity 17 is formed inside the fan blade 1.
As shown in fig. 1, 5 and 7, the vane boundary layer flow control system of the present embodiment includes a first guide section 21 and a second guide section 22. Wherein the first flow guiding section 21 is in communication with the blade cavity 17. As shown in fig. 1 and 4, the second flow guiding section 22 is communicated with the first flow guiding section 21, the second flow guiding section 22 is disposed on one side of the suction surface 13 close to the trailing edge 12 of the blade, and the second flow guiding section 22 has a flow guiding air hole 23, wherein when the blade cavity 17 is contracted, the internal air is ejected from the flow guiding air hole 23, and when the blade cavity 17 is expanded, the external air is sucked from the flow guiding air hole 23.
The blade boundary layer flow control system provided by the invention utilizes the air flow generated by the self elastic deformation of the fan blade 1 in the operation process of the wind generating set to blow and suck air to the blade boundary layer. When the internal volume of the blade cavity 17 is reduced, the extruded air flows through the first guide section 21 and is ejected from the second guide section 22 to the guide air holes 23, and high-energy gas is injected into the boundary layer by blowing air, so that the boundary layer is further developed to the rear edge 12, the boundary layer separation is delayed, the load of the fan blade 1 is reduced, the aerodynamic performance of the fan blade 1 is improved, and the power generation is improved;
when the internal volume of the blade cavity 17 is increased, external air is sucked into the blade cavity 17 from the guide air holes 23 of the second guide section 22 by the low pressure in the blade cavity 17, and low-energy gas in a blade boundary layer is sucked into the blade cavity 17, so that external high-energy gas is supplemented into the boundary layer, the boundary layer can be further developed to the trailing edge 12, the boundary layer separation is delayed, the blade load is reduced, the aerodynamic performance of the fan blade 1 is improved, and the power generation amount is improved.
Therefore, the boundary layer flow control system can perform flow control on the blade boundary layer by only utilizing the airflow change generated by the elastic deformation of the fan blade 1 in the running process of the wind turbine generator set without using additional airflow generation equipment such as an air pump and an air extractor and without additional energy consumption, so that the effects of inhibiting the separation of the blade boundary layer, delaying the stall of the fan blade 1, improving the pneumatic performance of the fan blade 1 and improving the power generation amount of the wind turbine generator set are realized.
As shown in fig. 2, 5 and 6, the fan blade 1 of the present embodiment has a blade root end 16, a blade root baffle 161 is disposed inside the blade root end 16, the blade root baffle 161 is provided with a vent 162 and a manhole cover 163, and the first flow guiding section 21 is communicated with the blade cavity 17 through the vent 162. Due to the arrangement of the vent holes 162 in the blade root baffle 161, the fan blade 1 can be prevented from being perforated in the housing, and therefore, the strength of the fan blade 1 is not reduced. The vent 162 serves as the sole inlet/outlet of the vane chamber 17 and is connected to the first inducer 21.
As shown in fig. 7, the root end 16 is connected to the hub 5, and the first flow guiding section 21 is wound from the inside of the hub 5 to the outside of the root end 16 and communicated with the second flow guiding section 22. The first inducer 21 bypasses the hub 5 and extends between the inboard and outboard sides of the blade root end 16.
In this embodiment, the first flow guiding section 21 is a soft pipe, and the second flow guiding section 22 is a hard pipe, wherein one end of the second flow guiding section 22 is connected to the first flow guiding section 21, and the other end is sealed. The soft tube facilitates the extension of the first inducer 21 between the inner and outer sides of the root end 16.
As shown in fig. 2, the second flow guiding section 22 of the present embodiment extends from the root end 16 towards the tip end 15 of the fan blade 1. This increases the covering distance of the second flow guiding section 22 in the longitudinal direction of the fan blade 1, and in particular the root end 16 is prone to boundary layer flow separation, which significantly improves aerodynamic performance.
As shown in fig. 6, the ventilation hole 162 of the present embodiment has a convex portion 1621 opposite to the blade root baffle 161, and the convex portion 1621 is connected to the first flow guiding section 21 in a sealing manner.
As shown in fig. 1 and 3, in the present embodiment, the second guide section 22 is disposed on the suction surface 13 near the trailing edge 12 of the blade, and no other structure is disposed on the suction surface 13 near the leading edge 11 of the blade. Wherein, the arrangement length of the second guide section 22 is 0% -50% of the total length of the fan blade 1.
In other embodiments, the suction surface 13 is provided with a plurality of rows of second flow guiding sections 22 on a side close to the trailing edge 12 of the blade. The multiple rows of second flow guide sections 22 can further reduce boundary layer flow separation, thereby significantly improving aerodynamic performance.
As shown in fig. 4, the second guide section 22 of the present embodiment has a first surface 221 facing upward and a second surface 222 facing the blade trailing edge 12, wherein the first surface 221 is streamlined, and the guide air holes 23 are disposed on the second surface 222. The streamlined first surface 221 minimizes its effect on the aerodynamic profile of the fan blade 1. The second surface 222 is oriented so that the blowing and sucking air of the guide air holes 23 can more accurately act on the boundary layer.
Wherein, the included angle formed by the normal direction of the second surface 222 and the tangential direction of the suction surface 13 towards the trailing edge 12 of the blade in the embodiment is in the range of 0-45 °.
As shown in fig. 4, the second flow guiding section 22 of the present embodiment is attached to the suction surface 13 by a double-sided tape or an adhesive layer 223 having a thickness of less than 1mm, and the height of the second flow guiding section 22 in the normal direction of the suction surface 13 is less than 10 mm. This reduces the height of the second flow guide section 22 as much as possible, and reduces the influence on the aerodynamic shape of the fan blade 1.
As shown in fig. 7, the present embodiment also discloses a wind park, wherein the wind park comprises a blade boundary layer flow control system. The wind power plant further comprises a nacelle 3, a tower 4 and a hub 5. The fan blade 1 is connected to a hub 5.
Example 2
As shown in fig. 8 and 9, in the present embodiment, the suction surface 13 is provided with a second guide section 22 on a side close to the trailing edge 12 of the blade, and the suction surface 13 is provided with a vortex generator 6 on a side close to the leading edge 11 of the blade. The vortex generators 6 arranged close to the side of the blade leading edge 11 can further improve the aerodynamic performance of the fan blade 1.
In this embodiment, the length of the second guide section 22 near the trailing edge 12 of the blade is the same as the length of the vortex generator 6 near the leading edge 11. Other structures in this embodiment are the same as those in embodiment 1, and therefore are not described herein.
Example 3
As shown in fig. 10 and 11, in the present embodiment, a second flow guiding section 22 is disposed on the suction surface 13 near the trailing edge 12 of the blade, and a second flow guiding section 22 is also disposed on the suction surface 13 near the leading edge 11 of the blade. The second flow guiding section 22 arranged near one side of the blade leading edge 11 can further improve the aerodynamic performance of the fan blade 1.
In the present embodiment, the length of the second guide section 22 near the trailing edge 12 of the blade is the same as the length of the second guide section 22 near the leading edge 11. Other structures in this embodiment are the same as those in embodiment 1, and therefore are not described herein.
In summary, the following steps: the boundary layer flow control system can perform flow control on the boundary layer of the blade by only utilizing the air flow generated by the elastic deformation of the fan blade in the running process of the wind turbine generator set under the conditions of not using additional air pump, air extractor and other air flow generating equipment and not additionally consuming energy, thereby realizing the effects of inhibiting the separation of the boundary layer of the blade, delaying the stall of the fan blade, improving the pneumatic performance of the fan blade and improving the generating capacity of the wind turbine generator set.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (14)

1. A blade boundary layer flow control system, comprising:
the fan blade is an elastic body and is provided with a suction surface, a pressure surface, a blade root end, a blade tip end, a blade front edge and a blade rear edge, wherein a blade cavity is formed inside the fan blade;
the first flow guide section is communicated with the blade cavity;
the second flow guide section is communicated with the first flow guide section and is arranged on one side, close to the trailing edge of the blade, of the suction surface, and provided with a flow guide air hole, wherein when the blade cavity is contracted, internal air is sprayed out of the flow guide air hole, and when the blade cavity is expanded, external air is sucked in from the flow guide air hole.
2. The blade boundary layer flow control system of claim 1, wherein a blade root baffle is disposed inside the blade root end, the blade root baffle is provided with a vent hole and a manhole cover, and the first flow guiding section is communicated with the blade cavity through the vent hole.
3. The blade boundary layer flow control system of claim 2, wherein the root end is connected to a hub, and the first inducer portion is routed from inside the hub to outside the root end and is in communication with the second inducer portion.
4. The blade boundary layer flow control system of claim 3, wherein the first flow guiding section is a soft pipe and the second flow guiding section is a hard pipe, wherein one end of the second flow guiding section is connected with the first flow guiding section and the other end is sealed.
5. The blade boundary layer flow control system of claim 2, wherein the second flow section extends from the root end toward the tip end.
6. The blade boundary layer flow control system of claim 2, wherein the air vent has a raised portion with respect to the root baffle, the raised portion being sealingly connected to the first inducer.
7. The blade boundary layer flow control system of claim 1, wherein the suction surface is provided with the second inducer proximate a trailing edge of the blade, and wherein the suction surface is provided with the second inducer or a vortex generator proximate a leading edge of the blade.
8. The blade boundary layer flow control system of claim 7, wherein a length of the second inducer portion proximate a side of the blade trailing edge corresponds to a length of the second inducer portion proximate a side of the blade leading edge or the vortex generator.
9. The blade boundary layer flow control system of claim 8, wherein the second inducer is disposed at a length between 0% and 50% of a total length of the fan blade.
10. The blade boundary layer flow control system of claim 1, wherein a side of the suction surface proximate the trailing edge of the blade is provided with a plurality of rows of the second inducer.
11. The blade boundary layer flow control system of claim 1, wherein the second inducer has a first surface facing upward and a second surface facing the blade trailing edge, wherein the first surface is streamlined and the inducer air holes are disposed in the second surface.
12. The blade boundary layer flow control system of claim 11, wherein a normal to the second surface forms an angle in a range of 0 ° -45 ° with a tangent to a direction of the suction surface toward the trailing edge of the blade.
13. The blade boundary layer flow control system of claim 1, wherein the second flow guiding section is attached to the suction surface by double-sided tape or adhesive, the double-sided tape or adhesive having a thickness of less than 1mm, the second flow guiding section having a height of less than 10mm normal to the suction surface.
14. A wind park according to any of claims 1-13, wherein the wind park comprises a blade boundary layer flow control system.
CN201911029930.9A 2019-10-25 2019-10-25 Blade boundary layer flow control system and wind generating set comprising same Active CN110594096B (en)

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CN108468619B (en) * 2018-03-26 2019-09-03 南京航空航天大学 A kind of centrifugal wind machine blade jet stream power enhancer

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