CN114215684A - Wind power blade and wind power generation device - Google Patents

Wind power blade and wind power generation device Download PDF

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Publication number
CN114215684A
CN114215684A CN202111543989.7A CN202111543989A CN114215684A CN 114215684 A CN114215684 A CN 114215684A CN 202111543989 A CN202111543989 A CN 202111543989A CN 114215684 A CN114215684 A CN 114215684A
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wind
main wing
wing
blade
wind power
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CN202111543989.7A
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Chinese (zh)
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李福军
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Individual
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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
    • 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
    • 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
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • 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)
  • Wind Motors (AREA)

Abstract

The application relates to the technical field of wind power generation, in particular to a wind power blade and a wind power generation device, and aims to solve the problem that wind receiving rate and wind energy conversion rate of the wind power blade are low. The utility model provides a wind-powered electricity generation blade, connect in the pivot, wind-powered electricity generation blade includes main wing and auxiliary wing, the first end of main wing extends and is connected with the pivot along the axis direction of pivot, the second end of main wing extends and is connected with auxiliary wing along the axis direction of keeping away from the pivot, one end through keeping away from the pivot at the main wing sets up auxiliary wing, can increase the area of contact of wind-powered electricity generation blade and incoming air current, reduce the air leakage rate, improve and receive the wind rate, through forming the angle of gathering wind between main wing and auxiliary wing, can increase wind-powered electricity generation blade's the ability of gathering wind, improve wind energy conversion, receive the improvement of wind rate and wind energy conversion and can make the pivot of being connected with wind-powered electricity generation blade obtain bigger shaft power.

Description

Wind power blade and wind power generation device
Technical Field
The application relates to the technical field of wind power generation, in particular to a wind power blade and a wind power generation device.
Background
Wind power generation refers to converting kinetic energy of wind into electric energy. Wind energy is not only a clean and pollution-free renewable energy source, but also has a huge amount of wind energy, so that the wind energy is increasingly paid attention by various countries in the world.
In the correlation technique, the wind power blades that wind power generation set adopted are slender body blades, and the blade is installed in the pivot, and the blade reduces gradually from the one end that is close to the pivot to the one end cross-sectional area of keeping away from the pivot, and the surface of blade is smooth surface, and in the length direction of blade, there is not the shape sudden change in the surface of blade.
However, the wind receiving rate and the wind energy conversion rate of the wind power blade are low.
Disclosure of Invention
The application provides a wind power blade and wind power generation set, aims at solving the lower problem of wind receiving rate and wind energy conversion rate of wind power blade.
In order to achieve the above object, in a first aspect, the present application provides a wind power blade connected to a rotating shaft, the wind power blade including a main wing and an auxiliary wing, a first end of the main wing extends along an axial direction of the rotating shaft and is connected to the rotating shaft, and a second end of the main wing extends along an axial direction away from the rotating shaft and is connected to the auxiliary wing;
a wind gathering angle is formed between the second end of the main wing and the auxiliary wing.
The utility model provides a wind-powered electricity generation blade, connect in the pivot, wind-powered electricity generation blade includes main wing and auxiliary wing, the first end of main wing extends and is connected with the pivot along the axis direction of pivot, the second end of main wing extends and is connected with auxiliary wing along the axis direction of keeping away from the pivot, one end through keeping away from the pivot at the main wing sets up auxiliary wing, can increase the area of contact of wind-powered electricity generation blade and incoming air current, reduce the air leakage rate, improve and receive the wind rate, through forming the angle of gathering wind between main wing and auxiliary wing, can increase wind-powered electricity generation blade's the ability of gathering wind, improve wind energy conversion, receive the improvement of wind rate and wind energy conversion and can make the pivot of being connected with wind-powered electricity generation blade obtain bigger shaft power.
In the wind turbine blade, optionally, the main wing has a spiral structure; and/or the wind gathering angle is an obtuse angle.
In the wind power blade, optionally, the width of the main wing gradually decreases in a direction from the first end of the main wing to the second end of the main wing;
and/or the thickness of the main wing gradually decreases in the direction from the first end of the main wing to the second end of the main wing;
and/or the width of the end surface of the first end of the main wing is larger than the thickness of the end surface of the first end of the main wing.
In the wind power blade, optionally, the main wing includes a first windward surface and a first leeward surface, the first windward surface is an inward-concave rough surface, and the first leeward surface is an outward-convex smooth surface;
and/or the main wing comprises a first windward side edge and a first leeward side edge, wherein the first windward side edge is a curved surface, and the first leeward side edge is a curved line;
the thickness of the main wing gradually decreases in the direction from the first windward side edge to the first leeward side edge.
In the wind power blade, optionally, the width of the auxiliary wing gradually decreases in a direction from one end close to the main wing to one end far away from the main wing;
and/or the thickness of the auxiliary wing gradually decreases from one end close to the main wing to one end far away from the main wing;
and/or a pin shaft is arranged between the main wing and the auxiliary wing, and the main wing and the auxiliary wing are rotationally connected through the pin shaft.
In the wind turbine blade, optionally, the main wing includes a first main wing, a second main wing and a middle wing, one end of the middle wing close to the first main wing is connected to the first main wing, and one end of the middle wing far from the first main wing is connected to the second main wing.
In the wind turbine blade, optionally, one end of the middle wing close to the first main wing is connected with the first main wing in an inserting manner, and one end of the connecting wing far from the first main wing is connected with the second main wing in an inserting manner.
In the wind power blade, optionally, the auxiliary wing includes a second windward surface and a second leeward surface, the second windward surface is an inward-concave rough surface, and the second leeward surface is an outward-convex smooth surface;
and/or the auxiliary wing comprises a second windward side edge and a second leeward side edge, wherein the second windward side edge is a curved surface, and the second leeward side edge is a curved line;
the thickness of the auxiliary wing gradually decreases in the direction from the second windward side edge to the second leeward side edge.
In the wind turbine blade, optionally, a width of one end of the auxiliary wing close to the main wing is greater than a width of a second end of the main wing.
In a second aspect, the present application provides a wind power generation apparatus, including a rotating shaft and a plurality of wind power blades as described above, the plurality of wind power blades are installed on the rotating shaft.
The application provides a wind power generation device, including pivot and many wind-powered electricity generation blades, many wind-powered electricity generation blades can follow the circumference of pivot and equidistant setting in the pivot, are favorable to balanced atress, can improve wind energy conversion, can also improve wind power generation device's working life. The wind power blade comprises a main wing and an auxiliary wing, the first end of the main wing extends along the axis direction of a rotating shaft and is connected with the rotating shaft, the second end of the main wing extends along the axis direction of the rotating shaft and is connected with the auxiliary wing, the auxiliary wing is additionally arranged at one end of the main wing far away from the rotating shaft, the contact area between the wind power blade and an incoming wind flow can be increased, the wind leakage rate is reduced, the wind receiving rate is improved, a wind collecting angle is formed between the main wing and the auxiliary wing, the wind collecting capacity of the wind power blade can be increased, the wind energy conversion rate is improved, and the rotating shaft connected with the wind power blade can obtain larger shaft power by the improvement of the wind receiving rate and the wind energy conversion rate.
The construction of the present application and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, but the present application is not limited to the embodiments, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a front view of a wind turbine blade provided by an embodiment of the present application;
FIG. 2 is a top view of a wind turbine blade provided by an embodiment of the present application;
FIG. 3 is a sectional view A-A of the wind turbine blade shown in FIG. 2 according to an embodiment of the present application;
fig. 4 is a sectional view of a connection portion of a main wing and a rotating shaft of a wind turbine blade provided in an embodiment of the present application.
Description of reference numerals:
100-wind power blades; 110-main wing;
111-a first main wing; 112-a second main wing;
113-middle wing; 114-a first windward side;
115-a first leeward side; 116-a first windward skirt;
117-first leeward skirt; 118-bumps;
120-auxiliary wing; 121-a second windward side;
122-a second leeward side; 123-a second windward side edge;
124-a second leeward skirt; 125-pin shaft;
126-third windward side margin; 127-a third leeward side edge;
200-rotating shaft.
Detailed Description
At present, in China and abroad, various new energy sources emerge endlessly just in the window period of rapid development of the new energy sources. The wind power industry stands out in numerous energy industries, and in the related art, wind power blades adopted by a wind power generation device are all slender blades, the blades are installed on a rotating shaft, the cross-sectional area of the blades is gradually reduced from one end close to the rotating shaft to the end far away from the rotating shaft, the outer surfaces (windward side and leeward side) of the blades are all smooth surfaces, and in the length direction of the blades, the outer surfaces of the blades do not have shape mutation, such as protrusion or depression. However, when the slender blade arranged on the wind power generation device contacts with the incoming wind current, the windward area of the blade is too small, so that the wind receiving rate of the wind power blade is low, and the wind gathering capacity of the blade is weak, so that the wind energy conversion rate of the wind power blade is low.
Based on foretell technical problem, the application provides a wind-powered electricity generation blade and wind power generation set, wind-powered electricity generation blade connects in the pivot, wind-powered electricity generation blade includes main wing and auxiliary wing, the first end of main wing extends and is connected with the pivot along the axis direction of pivot, the second end of main wing extends and is connected with auxiliary wing along the axis direction of keeping away from the pivot, auxiliary wing is add through the one end of keeping away from the pivot at the main wing, the area of contact of wind-powered electricity generation blade and incoming air current can be increased, the air leakage rate is reduced, the rate of receiving wind is improved, through forming the angle of collecting wind between main wing and auxiliary wing, the ability of collecting wind of wind-powered electricity generation blade can be increased, the wind energy conversion rate is improved, the improvement of rate of receiving wind and wind energy conversion rate can make the pivot of being connected with wind-powered electricity generation blade obtain bigger shaft power.
In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a front view of a wind turbine blade provided in an embodiment of the present application. Fig. 2 is a top view of a wind turbine blade provided in an embodiment of the present application. FIG. 3 is a sectional view A-A of the wind turbine blade shown in FIG. 2 according to an embodiment of the present application. Fig. 4 is a sectional view of a connection portion of a main wing and a rotating shaft of a wind turbine blade provided in an embodiment of the present application.
Referring to fig. 1 to 4, a wind turbine blade 100 provided by an embodiment of the present application is connected to a rotating shaft 200, where the wind turbine blade 100 includes a main wing 110 and an auxiliary wing 120, a first end of the main wing 110 extends along an axial direction of the rotating shaft 200 and is connected to the rotating shaft 200, a second end of the main wing 110 extends along an axial direction away from the rotating shaft 200 and is connected to the auxiliary wing 120, and a wind collecting angle is formed between the second end of the main wing 110 and the auxiliary wing 120.
The utility model provides a wind power blade 100, connect on pivot 200, wind power blade 100 includes main wing 110 and auxiliary wing 120, the first end of main wing 110 extends and is connected with pivot 200 along the axis direction of pivot 200, the second end of main wing 110 extends and is connected with auxiliary wing 120 along the axis direction of keeping away from pivot 200, auxiliary wing 120 is add through the one end of keeping away from pivot 200 at main wing 110, can increase wind power blade 100 and the area of contact of incoming air current, reduce the air leakage rate, improve and receive the wind rate, through forming the angle of gathering between main wing 110 and auxiliary wing 120, can increase wind power blade 100's the ability of gathering wind, improve wind energy conversion rate, receive the improvement of wind rate and wind energy conversion rate and can make the pivot 200 of being connected with wind power blade 100 obtain bigger shaft power.
The first end of the main wing 110 refers to an end of the main wing 110 close to the rotating shaft 200, and the second end of the main wing 110 refers to an end of the main wing 110 far from the rotating shaft 200.
The wind receiving rate is a ratio of a total windward area of the wind power blade 100 to an area of a rotating sweep circle formed when the wind power blade 100 rotates around the rotating shaft 200, that is, the wind receiving rate of the wind power blade 100 is a measure of a mutual contact degree between a windward side of the wind power blade 100 and an incoming wind flow in the area of the rotating sweep circle of the wind power blade 100.
The wind leakage rate is a ratio of a difference between an area of a rotating sweep circle formed when the wind turbine blade 100 rotates around the rotating shaft 200 and a total windward area of the wind turbine blade 100 to an area of a rotating sweep circle formed when the wind turbine blade 100 rotates around the rotating shaft 200, that is, the wind leakage rate of the wind turbine blade 100 reflects a part where the incoming wind current in the rotating sweep circle area of the wind turbine blade 100 is not in contact with the windward side of the wind turbine blade 100 and is lost.
It can be understood that if the contact area between the wind power blade 100 and the incoming wind flow is too small, i.e. the wind receiving rate is too low, most of the incoming wind flow is wasted, and only a small amount of wind energy can be converted into mechanical energy for rotating the wind power blade 100, so that it is difficult to obtain a high wind energy conversion rate. Wind-powered electricity generation blade 100 among the correlation technique adopts the blade of elongated body mostly, and the width to length ratio undersize of blade leads to wind-powered electricity generation blade 100 and the area of contact of coming wind air current undersize, receives the wind rate lower, and is mostly less than 30%, and the rate of leaking out is higher, and most exceeds 70%. Therefore, the width-to-length ratio of the wind power blade 100 is increased by changing the structure of the blade to increase the windward area, and thus increasing the wind receiving rate of the wind power blade 100 is the key to increasing the wind energy conversion rate.
The shaft power of the rotating shaft 200 refers to the power obtained by the rotating shaft 200 when converting wind energy into mechanical energy of the rotating shaft 200. The wind receiving rate of the wind power blade 100 reflects the wind energy utilization rate, that is, the larger the wind receiving rate is, the larger the wind energy that can be utilized is, and on the contrary, the smaller the wind receiving rate is, the smaller the wind energy that can be utilized is. The wind energy conversion rate of the wind power blade 100 reflects the degree of converting the wind energy that can be utilized into the mechanical energy of the rotation of the wind power blade 100, that is, the larger the wind energy conversion rate is, the more the mechanical energy of the unit wind energy conversion is, on the contrary, the smaller the wind energy conversion rate is, the less the mechanical energy of the unit wind energy conversion is, and therefore, the shaft power of the rotating shaft 200 connected with the wind power blade 100 can be increased through the improvement of the wind receiving rate and the wind energy conversion rate.
Referring to fig. 2, the wind convergence angle may be represented as α in the wind direction, and after entering the wind convergence angle, the incoming wind flows flow along the wall surface forming the wind convergence angle to form a rotating airflow, and the rotating airflow generates a centrifugal force in the wind direction in the wind convergence angle, and the centrifugal force may generate a rotating boost force for the main wing 110 and the auxiliary wing 120, which is beneficial to improving the wind energy conversion rate and the shaft power of the rotating shaft 200. The direction of the incoming wind flow is as indicated by the arrows in fig. 2 to 4, i.e. the wind direction is along the axial direction of the rotating shaft 200, and in fig. 1, the direction of the incoming wind flow is towards the inside of the page. Referring to fig. 1, a wind collecting angle may be represented by β in a rotation direction of the wind turbine blade 100, that is, a rotation direction of the rotation shaft, and by providing the auxiliary wing 120 at an end of the main wing 110 away from the rotation shaft 200, a contact area between the wind turbine blade 100 and an incoming wind flow may be increased, a wind receiving rate of the wind turbine blade 100 may be increased, a wind collecting angle in the rotation direction of the wind turbine blade 100 may be formed by the main wing 110 and the auxiliary wing 120, a circumferential centrifugal force may be formed in a region close to the wind collecting angle, and the circumferential centrifugal force may generate a rotation boosting force to the main wing 110 and the auxiliary wing 120, and a wind energy conversion rate of the wind turbine blade 100 and an axial power of the rotation shaft 200 may be greatly increased.
As one possible implementation, the main wing 110 has a helical configuration.
It should be noted that, as shown in fig. 1 and fig. 2, by extending the first end of the main wing 110 along the axial direction of the rotating shaft 200, the width of the wind power blade 100 may be increased, and a wide blade is formed, that is, the width-to-length ratio of the wind power blade 100 is increased, and the wide blade may improve the connection strength between the wind power blade 100 and the rotating shaft 200. Wherein, the width direction of the wind power blade 100 is the axial direction of the rotating shaft 200. Through setting up the main wing 110 to helical structure, can be so that wind-powered electricity generation blade 100's windward side be the helicoid, can also make the wide body blade have bigger windward area in the incoming wind direction, increase wind-powered electricity generation blade 100 and the area of contact of the air current that comes, the wind rate is received in the increase, and simultaneously, the helicoid can also play certain effect of gathering wind, improves wind energy conversion, and then makes the pivot 200 of being connected with wind-powered electricity generation blade 100 obtain bigger shaft power. Referring to fig. 4, the main wing 110 has a wind angle, which may be represented by γ, and the wind angle gradually increases from a first end of the main wing 110 to a second end of the main wing 110. Since the second end of the main wing 110 is twisted at a certain angle with respect to the first end of the main wing 110 to form a spiral structure, the wind angle of the main wing 110 gradually increases along the length direction of the main wing 110, i.e., the radial direction of the rotating shaft 200.
In one possible implementation, the wind collection angle is an obtuse angle.
It should be noted that, referring to fig. 1 and fig. 2, a wind-gathering angle formed by the main wing 110 and the auxiliary wing 120 is set to be an open obtuse angle, specifically, along the wind direction, the wind-gathering angle α is greater than 90 °, and along the rotation direction of the wind power blade 100, the wind-gathering angle β is greater than 90 °, so that the wind power blade 100 has a larger wind-gathering angle, and has a stronger wind-gathering capability, thereby improving the wind energy conversion effect, and the length of the wind power blade 100 can be increased, that is, the contact area between the wind power blade 100 and the incoming wind current is increased, and the wind-receiving rate is increased, thereby increasing the shaft power of the rotating shaft 200. The length direction of the wind turbine blade 100 refers to the radial direction of the rotating shaft 200.
Specifically, the auxiliary wing 120 is arranged at one end of the main wing 110 far away from the rotating shaft 200, and a wind-gathering obtuse angle is formed at the connecting position of the main wing 110 and the auxiliary wing 120, so that the purposes of improving the wind receiving rate and the wind energy conversion rate of the wind power blade 100 and the shaft power of the rotating shaft 200 can be achieved, and the following 10 aspects can be embodied.
1) The auxiliary wing 120 is connected to the main wing 110 to form a wind-gathering obtuse angle, so that the contact area of the wind power blade 100 and the incoming wind current can be increased, the wind-receiving rate is improved, the incoming wind current can be converged, the wind energy conversion rate is improved, and the shaft power of the rotating shaft 200 is further improved.
2) The wind energy conversion efficiency is improved by the aid of the structure that the main wing 110 and the auxiliary wing 120 are connected, namely, the wind gathering corner can be used for obviously converging the incoming wind, the incoming wind can generate a thick boundary layer at the wind gathering corner, so that turbulent micro-vortex at the wind gathering corner is increased, the additional density and the additional viscosity of the gas are increased, the shearing force of the gas is increased, and the pressure of the gas is increased. The boundary layer is a thin flow layer with non-negligible viscous force close to the object surface in the high Reynolds number streaming, and is also called as a flow boundary layer and a boundary layer.
3) The auxiliary wing 120 is connected to the main wing 110 to form a wind-gathering obtuse angle, so that the incoming wind flow is gathered and compressed at the wind-gathering obtuse angle to form a pressure cone, the impact of the incoming wind flow on the wind power blade 100 for the first impact can be increased, and the wind energy conversion rate and the shaft power of the rotating shaft 200 are improved.
4) By connecting the auxiliary wings 120 to the main wings 110 and forming the wind-gathering obtuse angle, when the incoming wind flows along the surface of the wind power blade 100, the flow direction of the wind flows is changed, so that the secondary impulse of the boundary layer to the wind power blade 100 is increased, and the wind energy conversion rate and the shaft power of the rotating shaft 200 are improved.
5) When the wind current flows on the surface of the wind power blade 100, friction force is generated, and the friction force works on the wind power blade 100, so that the wind energy conversion rate and the shaft power of the rotating shaft 200 are improved.
6) In the flowing process of the pressure cone formed by the incoming wind flow on the wind power blade 100, the pressure is gradually reduced, and the volume is gradually increased, so that the pressure cone can be continuously expanded to apply work to the wind power blade 100, and the wind energy conversion rate and the shaft power of the rotating shaft 200 are improved.
7) The main wing 110 and the auxiliary wing 120 form an arc-shaped wind gathering area at a wind gathering angle, the airflow forms a rotating airflow in the wind gathering area and generates various circumferential centrifugal forces, and the various circumferential centrifugal forces can apply work to the wind power blade 100, so that the wind energy conversion rate and the shaft power of the rotating shaft 200 are improved.
Specifically, the circumferential centrifugal force applied to the wind turbine blade 100 mainly includes the following three types:
the first method comprises the following steps: along the wind direction, after entering the wind-gathering angle formed by the main wing 110 and the auxiliary wing 120, the incoming wind flows will flow along the wall surface forming the wind-gathering angle to form a rotating airflow, and the rotating airflow mainly occurs in the plane where the incoming wind flows.
And the second method comprises the following steps: along the direction of rotation of wind power blade 100, after the incoming wind stream and main wing 110 take place the impact for the first time, part incoming wind stream can throw away along wind power blade 100's radial, then meets the auxiliary wing 120 of being connected with main wing 110 obtuse angle, and then produces rotatory air current, and this rotatory air current mainly takes place in wind power blade 100's rotation plane.
And the third is that: the windward surfaces of the main wing 110 and the auxiliary wing 120 are both concave surfaces, and the incoming wind flow generates a rotating airflow in the concave surfaces, and the rotating airflow mainly occurs in the vertical plane of the length of the wind power blade 100.
8) The auxiliary wing 120 is disposed at one end of the main wing 110 away from the rotating shaft 200, so that a greater air pressure can be formed on the windward side of the wind power blade 100, and the air pressure on the leeward side is basically kept unchanged, thereby increasing the lifting thrust of the wind power blade 100, and improving the wind energy conversion rate and the shaft power of the rotating shaft 200.
9) The flap 120 can also generate lift thrust by providing the flap 120 at an end of the main wing 110 remote from the rotation shaft 200. The lift thrust is a pressure difference generated on both sides (windward side and leeward side) of the auxiliary wing 120, and the pressure difference is used to drive the auxiliary wing 120 to rotate, thereby increasing the wind energy conversion rate and the shaft power of the rotating shaft 200.
10) The auxiliary wing 120 is arranged at one end, far away from the rotating shaft 200, of the main wing 110, various acting forces applied to the wind power blade 100 by airflow can be increased, most of the acting forces are concentrated on the tail portion, far away from one end of the rotating shaft 200, of the wind power blade 100, large rotating moment can be achieved, the acting effect on the wind power blade 100 can be improved, and the wind energy conversion rate and the shaft power of the rotating shaft 200 are improved.
As one possible embodiment, the width of the main wing 110 is gradually reduced in a direction from the first end of the main wing 110 to the second end of the main wing 110.
It should be noted that, referring to fig. 1 and fig. 2, the width of the main wing 110 may be represented by W1, and by setting the width of the main wing 110 to gradually decrease from the first end to the second end, the connection end of the main wing 110 and the rotating shaft 200 may have a larger connection area in the width direction, so as to ensure sufficient connection strength between the main wing 110 and the rotating shaft 200, and also reduce the weight of the cantilever end of the main wing 110, and reduce the risk of the cantilever end of the main wing 110 bending and deforming under the effect of the incoming wind flow. The cantilever end of the main wing 110 is an end of the main wing 110 away from the rotation axis, i.e. a second end of the main wing 110.
As another possible implementation, the width of the main wing 110 is maintained constant in a direction from the first end of the main wing 110 to the second end of the main wing 110.
It should be noted that, by setting the width of the main wing 110 to be constant in the direction from the first end to the second end, the structure of the main wing 110 can be simplified, the processing and manufacturing difficulty and the cost of the main wing 110 can be reduced, the area of the first windward side 114 of the main wing 110 can be increased, the contact area with the incoming airflow can be increased, and the wind receiving rate can be increased. In one possible implementation, the thickness of the main wing 110 gradually decreases in a direction from the first end of the main wing 110 to the second end of the main wing 110.
It should be noted that, referring to fig. 1, the thickness of the main wing 110 may be represented by H1, and by setting the thickness of the main wing 110 to gradually decrease from the first end to the second end, the connection end of the main wing 110 and the rotating shaft 200 may have a larger connection area in the thickness direction, so as to ensure sufficient connection strength between the main wing 110 and the rotating shaft 200, and also reduce the weight of the cantilever end of the main wing 110, and reduce the risk of the cantilever end of the main wing 110 bending and deforming under the action of the incoming airflow.
In one possible implementation, the width of the end surface of the first end of the main wing 110 is greater than the thickness of the end surface of the first end of the main wing 110.
It should be noted that, referring to fig. 4, the width of the end face of the first end of the main wing 110 may be represented by W2, the thickness of the end face of the first end of the main wing 110 may be represented by H2, the thickness of the end face of the first end includes the thickness of the end face of the windward end and the thickness of the end face of the leeward end, the thickness of the end face of the windward end may be represented by H21, and the thickness of the end face of the leeward end may be represented by H22, which satisfy the following relations: h2 ═ H21+ H22, H22 > H21. The width of the end surface of the first end of the main wing 110 is set to be greater than the thickness of the end surface of the first end of the main wing 110, so that the first end of the main wing 110 is distributed along the axial direction of the rotating shaft 200, the resistance of the incoming airflow to the root of the main wing 110 can be reduced, and the fracture resistance of the main wing 110 is improved. Meanwhile, the end surface of the first end of the main wing 110 may have a smaller windward angle γ, for example, the windward angle γ may range from 5 to 15 °, so as to improve the lift and rotation performance of the root of the main wing.
As an implementation, the main wing 110 includes a first windward side 114 and a first leeward side 115, the first windward side 114 is a concave rough side, and the first leeward side 115 is a convex smooth side.
It should be noted that, as shown in fig. 2 and fig. 3, by making the first windward side 114 of the main wing 110 be an inward concave rough surface, for example, a plurality of protruding points 118 may be arranged on the first windward side 114 at intervals, the shape of the protruding points 118 may be a hemisphere or a polyhedron, and the like, wherein the surface of the protruding points 118 may be a rough surface, that is, the protruding points 118 are set as rough protruding points, and the specific shape of the protruding points 118 is not limited in the embodiment of the present application, and a user may select the protruding points as needed.
The first leeward side 115 is a convex smooth side, and has the following advantages: macroscopically, according to the wing lift theory, the first leeward surface 115 is an outward-convex smooth surface, the airflow is mainly in a laminar flow state, the resistance is small, and the flow velocity of the airflow is high to form a low-pressure area. The first windward side 114 is an inward concave rough surface, and the flow velocity of the airflow is slow to form a high pressure region, so that a pressure difference is generated on two sides of the main wing 110, and the pressure difference is a lifting thrust acting on the main wing 110 and can be used for pushing the wind power blade 100 to rotate circumferentially.
Meanwhile, the first windward side 114 is an inward concave rough surface, which can change the flow direction of the airflow along the first windward side 114, and generate the reverse impulse of the secondary flow on the first windward side 114, thereby further enhancing the acting force for pushing the wind power blade 100 to rotate. Microscopically, the first leeward surface 115 is a convex smooth surface, so that the resistance is small, and the relative sliding between airflow and the wind power blade 100 is facilitated, and the first windward surface 114 is a concave rough surface, so that the wind speed can be reduced, the lifting thrust can be improved, more importantly, secondary impulse and airflow friction can be generated on the first windward surface 114, a new wind energy conversion mechanism can be formed, a turbulent flow boundary layer can be generated on the first windward surface 114, the turbulent flow additional viscosity, additional pressure and additional impulse can be generated, and the wind energy conversion rate and the shaft power of the rotating shaft 200 can be improved.
Specifically, when the elongated blade in the related art faces the wind, two forces are mainly applied: the lifting thrust (the pressure difference generated by the airflow on two opposite sides of the blade) and the impulse (the impulse of the airflow on the blade) only work on the blade by the lifting thrust and the impulse, so that the wind energy conversion rate and the shaft power of the rotating shaft 200 are lower, namely the wind energy conversion mechanism mainly comprises two mechanisms. The wing profile of the main wing 110 of the embodiment of the present application adopts a convex-concave different-surface design, that is, the first windward surface 114 is an inward-concave rough surface, and the first leeward surface 115 is an outward-convex smooth surface, so that the main wing 110 can receive the following 8 acting forces, and the wind energy conversion mechanism mainly includes 8.
1) The first windward side 114 is an inward-concave rough surface with large resistance, low flow rate and large pressure, and the first leeward side 115 is an outward-convex smooth surface with small resistance, high flow rate and low pressure, so that the lifting thrust acts on the main wing 110 to apply positive power to the wind power blade 100.
2) The incoming wind airflow may impact the first windward surface 114 at a certain windward angle, and the impulsive force acts on the main wing 110 to apply positive work to the wind turbine blade 100.
3) When the incoming wind flows along the width and/or length direction of the first windward surface 114, a boundary layer is formed under the absorption of the first windward surface 114 and the vortex spin absorption of the micro-roughness surface, and the boundary layer generates additional impulse to act on the main wing 110, so as to apply positive work to the wind turbine blade 100.
4) The first windward side 114 is an inward concave rough surface, incoming wind airflow is easy to generate layer flow direction turbulence conversion on the first windward side 114, the turbulence increases the density, pressure, additional viscosity, shearing force and the like of gas, turbulence additional impulse is generated, and the turbulence additional impulse acts on the main wing 110 and can do positive work on the wind power blade 100.
5) The first windward side 114 is an inward concave rough surface, and the incoming wind flow passes through the rough surface along the width and/or length direction of the first windward side 114 to generate a large friction force, and the airflow friction force acts on the main wing 110 to apply positive work to the wind power blade 100.
Wherein, the width of the blade of the slender body in the related art is too narrow, and the air flow friction force does little or negligible positive work.
6) After the incoming wind flow impacts the first inward-concave windward surface 114, the wind flow is compressed to form a high-pressure area, the compressed wind flow performs secondary flow along the width and/or length direction of the first windward surface 114 and gradually expands in the flowing process, and the expansion force acts on the main wing 110 to perform positive work on the wind power blade 100.
Wherein, the width of the slender blade in the related art is too narrow, and the air current expansion force has little or negligible positive work.
7) The incoming wind flow easily forms a rotating flow at the concave part of the first windward side 114, and also forms a rotating flow at a wind-gathering angle region enclosed by the main wing 110 and the auxiliary wing 120, the rotating flow can generate a circumferential centrifugal force in the rotation direction of the wind power blade 100, and the circumferential centrifugal force acts on the main wing 110 and can apply positive work to the wind power blade 100.
8) The first windward side 114 is an inward concave rough surface, so that a spiral vortex formed on the first windward side 114 can be increased, the first leeward side 115 is an outward convex smooth surface, the spiral vortex formed on the first leeward side 115 can be reduced, and the spiral vortex acting on the main wing 110 can perform positive work on the wind power blade 100.
The spiral vortex of the first windward side 114 acts on the main wing 110 and can apply positive power to the wind power blade 100, and the spiral vortex of the first leeward side 115 acts on the main wing 110 and can apply negative power to the wind power blade 100.
It should be noted that the acting force acting on the wind turbine blade 100 is caused by a change in the density of the incoming wind flow and/or a change in the speed of the wind flow, and is also caused by a change in the direction of the incoming wind flow.
In one possible implementation, the main wing 110 includes a first windward side edge 116 and a first leeward side edge 117, the first windward side edge 116 is a curved surface, the first leeward side edge 117 is a curved line, and the thickness of the main wing 110 gradually decreases in a direction from the first windward side edge 116 to the first leeward side edge 117.
Note that, as shown in fig. 1, the thickness of the main wing 110 may be represented by H1, and as shown in fig. 3, the first windward side edge 116 of the main wing 110 is formed into a curved surface, and the first leeward side edge 117 is formed into a curved line, whereby the resistance of the first windward side edge 116 to the incoming airflow can be reduced. By setting the thickness of the main wing 110 to be gradually reduced in the direction from the first windward side edge 116 to the first leeward side edge 117, it is also possible to reduce the resistance of the airflow flowing from the first windward side edge 116 to the first leeward side edge 117, and improve the wind energy conversion rate.
As one possible embodiment, the width of the subsidiary wing 120 is gradually reduced in a direction from an end close to the main wing 110 to an end far from the main wing 110.
It should be noted that, referring to fig. 2, the width of the auxiliary wing 120 may be represented by W3, and by setting the width of the auxiliary wing 120 to gradually decrease from the end close to the main wing 110 to the end away from the main wing 110, the connection end of the auxiliary wing 120 and the main wing 110 may have a larger connection area in the width direction, so as to ensure sufficient connection strength between the auxiliary wing 120 and the main wing 110, and also reduce the weight of the cantilever end of the auxiliary wing 120, and reduce the risk of the cantilever end of the auxiliary wing 120 bending and deforming under the action of the incoming wind flow.
In one possible implementation, the thickness of the subsidiary wing 120 gradually decreases in a direction from an end close to the main wing 110 to an end far from the main wing 110.
It should be noted that, referring to fig. 1, the thickness of the auxiliary wing 120 may be represented by H3, and by setting the thickness of the auxiliary wing 120 to gradually decrease from the end close to the main wing 110 to the end away from the main wing 110, the connection end of the auxiliary wing 120 and the main wing 110 may have a larger connection area in the thickness direction, so as to ensure sufficient connection strength between the auxiliary wing 120 and the main wing 110, and also reduce the weight of the cantilever end of the auxiliary wing 120, and reduce the risk of the cantilever end of the auxiliary wing 120 bending and deforming under the effect of the incoming wind flow.
In a possible implementation manner, a pin 125 is disposed between the main wing 110 and the auxiliary wing 120, and the main wing 110 and the auxiliary wing 120 are rotatably connected by the pin 125.
It should be noted that, as shown in fig. 2, a pin 125 is disposed between the main wing 110 and the auxiliary wing 120, and the main wing 110 and the auxiliary wing 120 are rotatably connected by the pin 125, so that on one hand, the wind gathering angle can be adjusted, the controllability of the auxiliary wing is improved, and on the other hand, the folding connection between the main wing 110 and the auxiliary wing 120 can be realized. Specifically, a locking block may be further disposed on the pin 125, and when the wind gathering angle is adjusted to a desired angle, the position is locked by the locking block, so as to improve the stability of the wind turbine blade 100.
As an implementation, the main wing 110 includes a first main wing 111, a second main wing 112, and a middle wing 113, wherein an end of the middle wing 113 close to the first main wing 111 is connected to the first main wing 111, and an end of the middle wing 113 far from the first main wing 111 is connected to the second main wing 112.
It should be noted that, referring to fig. 1 and fig. 2, the main wing 110 is configured as a first main wing 111, a second main wing 112, and an intermediate wing 113 connecting the first main wing 111 and the second main wing 112, and the length of the main wing 110 is adjusted by changing the connection length of the intermediate wing 113 between the first main wing 111 and the second main wing 112, so as to avoid that the blade of the wind turbine blade 100 is too long and the blade tip linear velocity is too large and there is a blade segment that performs negative power, thereby preventing the wind energy conversion rate from being reduced.
Specifically, when the wind turbine blade 100 rotates, the backward geometric movement speed (related to the linear speed of rotation and the wind angle of the blade segment) of the wind turbine blade 100 in the wind speed direction can be usedVLeaf of Chinese characterThe wind speed can be represented by VWind powerIs represented by VLeaf of Chinese characterAnd VWind powerThe magnitude relationship of (a) affects the wind energy conversion rate of the wind turbine blade 100.
1) If VLeaf of Chinese character<VWind powerThen, the wind current impacts the wind power blade 100 to do positive work, and the shaft power of the rotating shaft 200 generated by the blade segment is greater than zero.
2) If VLeaf of Chinese character＝VWind powerThen, the work done by the wind current impacting the wind power blade 100 is zero, and the shaft power of the rotating shaft 200 generated by the blade segment is equal to zero.
3) If VLeaf of Chinese character>VWind powerThe wind power blade 100 in turn applies work to the incoming wind flow, and the shaft power of the rotating shaft 200 generated by the blade segment is smaller than zero (negative value).
Therefore, in the length direction of the wind power blade 100, if the angular velocity of the wind power blade 100 is too high and/or the length of the wind power blade 100 is too long, the linear velocity of the end portion of the wind power blade 100 far away from the rotating shaft 200 is easily too high, and the wind power blade 100 may perform work in a three-stage manner. That is, in the length direction from the position close to the rotating shaft 200 to the position far away from the rotating shaft 200 of the wind power blade 100, the wind power blade 100 includes a positive power section, a zero power section and a negative power section.
If the angular velocity of the wind turbine blade 100 is not changed, the linear velocity of the wind turbine blade 100 at a certain point is proportional to the length of the point. If the length of the wind turbine blade 100 is too long, so that the linear velocity of the blade segment far from the rotating shaft 200 is greater than the wind speed, the blade segment will perform negative work. Not only causes various costs of the wind turbine blade 100 to increase, but also severely reduces the wind energy conversion rate. Therefore, in actual use, the zero power blade segment and the negative power blade segment of the wind turbine blade 100 should be avoided.
When the wind power blade 100 is actually used, if the maximum linear velocity of the ultra-long wind power blade 100 is controlled within the range of positive power by greatly reducing the angular velocity of the wind power blade 100, the linear velocity of most blade segments is too small, the working capacity of fluid is not fully exerted, and the wind energy conversion rate is too low. Therefore, the angular velocity of the wind turbine blade 100 cannot be too low, and the linear velocity of the wind turbine blade 100 cannot be too high, which are a pair of contradictory requirements. The relation curve of the fan energy conversion rate (wind energy conversion rate) and the fan speed ratio is close to a normal distribution curve, and the fan speed ratio is too high or too low to be beneficial to fan energy conversion, so that the embodiment of the application provides the fan speed ratio equivalence principle and the optimization principle of different blade sections (leaf elements) in the length direction of the wind power blade 100, namely the wind energy conversion rate is improved, and the embodiment of the application is realized by changing the angular speed of the wind power blade 100 and the length of the wind power blade 100. Specifically, the wind turbine blade 100 is configured as a variable-length blade. When the wind speed is large, the angular velocity of the wind turbine blade 100 may be increased while increasing the length of the wind turbine blade 100. When the wind speed is low, the angular speed of the wind power blade 100 can be reduced, the length of the wind power blade 100 is reduced, the working capacity of the wind power blade 100 is fully exerted, and a negative-work blade section is avoided.
At present, the wing-shaped blade in the related art is disposed on the rotating shaft 200, and when the wing-shaped blade drives the rotating shaft 200 to rotate, an actual wind angle of the wing-shaped blade increases gradually from an end close to the rotating shaft 200 to an end far from the rotating shaft 200 in a length direction of the blade (i.e., a radial direction of the rotating shaft 200), but the wind angle gradually decreases, so that a lifting thrust of the wing-shaped blade decreases. When the wind angle is small to a certain extent, the lift thrust of the blade segment (i.e. the blade element segment) of the airfoil blade is reduced to a negative value, and the blade segment with the negative lift thrust can be called as the stall segment of the airfoil blade, so that the wind energy conversion rate of the airfoil blade is greatly reduced. Therefore, the length of the wing-shaped blade must be limited to a certain extent, and therefore, the length of the wind power blade 100 is adjusted by arranging the middle wing 113 in the embodiment of the present application, so that the blade section that does negative work due to the overlong blade is avoided, and meanwhile, the main wing 110 of the embodiment of the present application is of a spiral structure, and the windward angle of the main wing 110 gradually increases from the end close to the rotating shaft 200 to the end far from the rotating shaft 200.
In an embodiment, one end of the middle wing 113 close to the first main wing 111 is plugged into the first main wing 111, and one end of the connection wing far from the first main wing 111 is plugged into the second main wing 112.
It should be noted that, as shown in fig. 1 and fig. 2, the intermediate wing 113 is respectively inserted into the first main wing 111 and the second main wing 112, so as to facilitate the adjustment of the length of the main wing 110. Specifically, when the length of the main wing 110 needs to be increased, the insertion length of the middle wing 113 with the first main wing 111 and/or the second main wing 112 is decreased. Conversely, when the length of the main wing 110 needs to be reduced, the insertion length of the middle wing 113 with the first main wing 111 and/or the second main wing 112 is increased.
In a possible implementation manner, slots may be provided on the first main wing 111 and the second main wing 112, and insertion blocks are provided at two ends of the middle wing 113, and the insertion blocks are inserted into the slots. In another possible implementation manner, insertion blocks may be disposed on the first main wing 111 and the second main wing 112, and insertion slots are disposed at two ends of the middle wing 113, and the insertion blocks are inserted into the insertion slots.
As an implementation, the auxiliary wing 120 includes a second windward side 121 and a second leeward side 122, the second windward side 121 is a concave rough side, and the second leeward side 122 is a convex smooth side.
It should be noted that, by making the second windward surface 121 of the auxiliary wing 120 an inward-concave rough surface and the second leeward surface 122 an outward-convex smooth surface, the following advantages are provided: macroscopically, according to the wing lift theory, the second leeward surface 122 is an outward convex smooth surface, the airflow is mainly in a laminar flow state, the resistance is small, and the flow velocity of the airflow is fast to form a low-pressure area. The second windward surface 121 is an inward concave rough surface, and a high pressure region is formed when the flow rate of the airflow is low, so that a pressure difference is generated on two sides of the auxiliary wing 120, and the pressure difference is a lifting thrust acting on the auxiliary wing 120 and can be used for pushing the wind turbine blade 100 to rotate in the circumferential direction. Meanwhile, the second windward side 121 is an inward concave rough surface, which can also change the flow direction of the airflow along the second windward side 121, and generate a reverse impulse of the secondary flow on the second windward side 121, thereby further enhancing the acting force for pushing the wind power blade 100 to rotate. Microscopically, the second leeward surface 122 is a convex smooth surface, which has small resistance and is beneficial to relative sliding between airflow and the wind power blade 100, and the second windward surface 121 is a concave rough surface, which not only can reduce the wind speed and improve the lifting thrust, but also can generate secondary impulse and airflow friction on the second windward surface 121 to form a new wind energy conversion mechanism, and can also generate a turbulent flow boundary layer on the second windward surface 121 to generate turbulent flow additional viscosity, additional pressure and additional impulse, thereby improving the wind energy conversion rate and the shaft power of the rotating shaft 200.
The wing profile of the auxiliary wing 120 in the embodiment of the present application adopts a convex-concave different-surface design, that is, the second windward surface 121 is an inward-concave rough surface, and the second leeward surface 122 is an outward-convex smooth surface, so that the auxiliary wing 120 can receive the following 8 acting forces, and the wind energy conversion mechanism mainly includes 8 acting forces.
1) The second windward side 121 is an inward concave rough surface with large resistance, low flow rate and large pressure, and the second leeward side 122 is an outward convex smooth surface with small resistance, high flow rate and low pressure, so that the lifting thrust acts on the auxiliary wings 120 to apply positive power to the wind power blade 100.
2) The incoming wind airflow may impact the second windward surface 121 at a certain windward angle for the first time, and the impulsive force acts on the auxiliary wing 120 to apply positive work to the wind turbine blade 100.
3) When the incoming wind flows along the width and/or length direction of the second windward surface 121, a boundary layer airflow is formed under the absorption of the second windward surface 121 and the vortex rotational absorption of the micro-roughness surface, and the boundary layer airflow generates a friction force to act on the auxiliary wing 120, so as to apply positive work to the wind turbine blade 100.
4) The second windward side 121 is an inward concave rough surface, incoming wind airflow is prone to generate layer flow direction turbulence conversion on the second windward side 121, the turbulence increases the density, pressure, additional viscosity, shearing force and the like of gas, turbulence additional impulse force is generated, and the turbulence additional impulse force acts on the auxiliary wing 120 and can apply positive work to the wind power blade 100.
5) The second windward surface 121 is an inward concave rough surface, and when airflow passes through the rough surface along the width and/or length direction of the second windward surface 121, a large friction force is generated, and the airflow friction force acts on the auxiliary wing 120 and can apply positive work to the wind power blade 100.
6) After the incoming wind current impacts the second inward-concave windward surface 121, the wind current is compressed to form a high-pressure area, the compressed wind current flows for the second time along the width and/or length direction of the second windward surface 121 and gradually expands in the flowing process, and the expansion force acts on the auxiliary wing 120 to apply positive work to the wind power blade 100.
7) The incoming wind flow easily forms a rotating flow at the concave part of the second windward surface 121, or forms a rotating flow at the intersection of the main wing 110 and the auxiliary wing 120, and forms a circumferential centrifugal force, and the circumferential centrifugal force acts on the auxiliary wing 120 and can apply positive work to the wind power blade 100.
8) The second windward side 121 is an inward concave rough surface, so that a spiral vortex formed on the second windward side 121 can be increased, and the second leeward side 122 is an outward convex smooth surface, so that the spiral vortex formed on the second leeward side 122 can be reduced, and the spiral vortex acting on the auxiliary wing 120 is favorable for doing positive work on the wind power blade 100.
The spiral vortex of the second windward side 121 acts on the auxiliary wing 120 to apply positive power to the wind power blade 100, and the spiral vortex of the second leeward side 122 acts on the auxiliary wing 120 to apply negative power to the wind power blade 100.
It should be noted that the acting force on the wind turbine blade 100 is caused by a change in the density of the airflow and/or a change in the speed of the airflow, and is also caused by a change in the direction of the airflow.
In one possible implementation, the auxiliary wing 120 includes a second windward side edge 123 and a second leeward side edge 124, the second windward side edge 123 is a curved surface, the second leeward side edge 124 is a curved line, and the thickness of the auxiliary wing 120 gradually decreases in a direction from the second windward side edge 123 to the second leeward side edge 124.
Referring to fig. 1, the thickness of the flap 120 may be represented by H3, and the resistance of the second windward side edge 123 to the airflow may be reduced by providing the second windward side edge 123 of the flap 120 with a curved surface and the second leeward side edge 124 with a curved line. By setting the thickness of the auxiliary wing 120 to be gradually reduced in the direction from the second windward side edge 123 to the second leeward side edge 124, it is also possible to reduce the resistance of the airflow flowing from the second windward side edge 123 to the second leeward side edge 124, and to improve the wind energy conversion rate.
In one possible implementation, the auxiliary wing 120 includes a third windward side edge 126 and a third leeward side edge 127, the third windward side edge 126 is a curved surface, the third leeward side edge 127 is a curved line, and the thickness of the auxiliary wing 120 gradually decreases in a direction from the third windward side edge 126 to the third leeward side edge 127.
Referring to fig. 1, the thickness of the flap 120 may be represented by H3, and the resistance of the airflow caused by the circumferential rotation of the third windward side edge 126 can be reduced by providing the third windward side edge 126 of the flap 120 with a curved surface and providing the third leeward side edge 127 with a curved line. By setting the thickness of the auxiliary blade 120 to be gradually reduced in the direction from the third windward side edge 126 to the third leeward side edge 127, it is also possible to reduce the resistance of the airflow flowing from the third windward side edge 126 to the third leeward side edge 127, and improve the wind energy conversion rate.
As an implementation, the width of one end of the subsidiary wing 120 near the main wing 110 is greater than the width of the second end of the main wing 110.
It should be noted that, referring to fig. 2, the width of the auxiliary wing 120 may be represented by W3, and the width of the main wing 110 may be represented by W1, and the width of one end of the auxiliary wing 120 close to the main wing 110 is set to be greater than the width of the second end of the main wing 110, so that the diversion distance of the airflow along the width direction of the auxiliary wing 120 may be increased, the rotating work amount of the airflow may be increased, the lift force of the auxiliary wing 120 may be increased, and the output power of the wind turbine blade 100, that is, the shaft power of the rotating shaft 200 may be increased.
In a possible implementation, the height of the projection of the auxiliary wing 120 on the vertical plane is greater than the height of the projection of the main wing 110 on the vertical plane.
As shown in fig. 1, by setting the height of the projection of the auxiliary wing 120 on the vertical plane to be greater than the height of the projection of the main wing 110 on the vertical plane, the area of the wind collecting region formed at the wind collecting angle is increased although the wind collecting angle is constant, so that the wind collecting capability of the wind turbine blade 100 can be improved, and the wind energy conversion rate can be improved.
As one possible embodiment, the first end of the main wing 110 extends in the axial direction of the rotating shaft 200 and has a windward angle.
It should be noted that, as shown in fig. 1 to 4, by extending the first end of the main wing 110 along the axial direction of the rotating shaft 200, the connection strength between the wind turbine blade 100 and the rotating shaft 200 in the axial direction of the rotating shaft 200 can be improved, and a small wind angle is provided at the first end of the main wing 110, for example, the value range of the wind angle γ may be 5 to 15 °, that is, the first wind-facing side edge 116 of the first end of the main wing 110 is not directly opposite to the wind direction, but forms a certain angle of attack, which is beneficial for generating lift force to drive the wind turbine blade 100 to rotate rapidly when the wind turbine blade 100 contacts with the incoming wind flow. The first end of the main wing 110 refers to the root of the main wing 110, and the wind energy conversion mechanism of the blade section of the wind power blade 100 close to the rotating shaft 200 is mainly the lifting thrust mechanism of the airflow and is assisted by the impulse mechanism; the wind energy conversion mechanism of the blade section of the wind power blade 100 far away from the rotating shaft 200 is mainly an impulsive force mechanism and assisted by a lifting thrust mechanism; the impulse mechanism and the lift thrust mechanism are equally important in the wind energy conversion mechanism of the middle blade section of the wind turbine blade 100.
The wind power generation device provided by the embodiment of the application comprises a rotating shaft 200 and a plurality of wind power blades 100, wherein the plurality of wind power blades 100 are arranged on the rotating shaft 200.
The application provides a wind power generation device, including pivot 200 and many wind-powered electricity generation blades 100, many wind-powered electricity generation blades 100 can be along the equidistant setting in pivot 200 of the circumference of pivot 200, are favorable to balanced atress, can improve wind energy conversion, can also improve wind power generation device's life. The wind power blade 100 comprises a main wing 110 and an auxiliary wing 120, a first end of the main wing 110 extends along the axial direction of a rotating shaft 200 and is connected with the rotating shaft 200, a second end of the main wing 110 extends along the axial direction far away from the rotating shaft 200 and is connected with the auxiliary wing 120, the auxiliary wing 120 is additionally arranged at one end of the main wing 110 far away from the rotating shaft 200, the contact area between the wind power blade 100 and the incoming wind can be increased, the wind leakage rate is reduced, the wind receiving rate is improved, the wind gathering capacity of the wind power blade 100 can be increased by forming a wind gathering angle between the main wing 110 and the auxiliary wing 120, the wind energy conversion rate is improved, and the rotating shaft 200 connected with the wind power blade 100 can obtain larger axial power by improving the wind receiving rate and the wind energy conversion rate.
As one possible implementation, the wind turbine blade 100 includes 3-6 blades.
It should be noted that, in the related art, the wind power generation device generally adopts 3 slender wind power blades 100, and the 3 wind power blades 100 are disposed on the rotating shaft 200 at equal intervals in the circumferential direction of the rotating shaft 200. Because the adopted wind power blades 100 are small in width and length and small in number, the total contact area between the wind power blades 100 and the incoming wind is too small, that is, the wind receiving rate is too low, most of the incoming wind is wasted, only a small amount of wind energy can be received and utilized and converted into mechanical energy of the rotating shaft 200, and it is difficult to obtain high wind energy conversion rate and shaft power of the rotating shaft 200, wherein the shaft power of the rotating shaft 200 is the input power of the wind power generation device. According to the embodiment of the application, the wind power blades 100 are set to have a large width-length ratio and 3-6, the wind receiving rate, the wind energy conversion rate and the input power of the wind power generation device of the wind power blades 100 can be improved, the input cost of unit output can be reduced, when the wind power generation device is actually used, a user can select 3, 4, 5 or 6 wind power blades 100 according to needs, and the wind power generation device is not limited in the embodiment of the application. The input power of the wind turbine generator is the shaft power of the rotating shaft 200.
In the description of the embodiments of the present application, it should be understood that the terms "mounted," "connected," and "connected" are used broadly and can refer to a fixed connection, an indirect connection through intermediary media, communication between two elements, or an interaction between two elements, for example, unless explicitly stated or limited otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. The terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like refer to an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application. In the description of the present application, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A wind power blade is characterized by being connected to a rotating shaft, and comprises a main wing and an auxiliary wing, wherein the first end of the main wing extends along the axis direction of the rotating shaft and is connected with the rotating shaft, and the second end of the main wing extends along the axis direction far away from the rotating shaft and is connected with the auxiliary wing;
a wind gathering angle is formed between the second end of the main wing and the auxiliary wing.
2. The wind blade as set forth in claim 1 wherein said main wing is of a helical configuration; and/or the wind gathering angle is an obtuse angle.
3. The wind blade as set forth in claim 1 wherein the main wing gradually decreases in width in a direction from the first end of the main wing to the second end of the main wing;
and/or the main wing gradually decreases in thickness in a direction from the first end of the main wing to the second end of the main wing;
and/or the width of the end surface of the first end of the main wing is larger than the thickness of the end surface of the first end of the main wing.
4. The wind blade of claim 1 wherein said main wing includes a first wind-facing surface and a first leeward surface, said first wind-facing surface being an inwardly concave rough surface and said first leeward surface being an outwardly convex smooth surface;
and/or the main wing comprises a first windward side edge and a first leeward side edge, wherein the first windward side edge is a curved surface, and the first leeward side edge is a curved line;
the thickness of the main wing gradually decreases in a direction from the first windward side edge to the first leeward side edge.
5. The wind power blade as claimed in claim 1, wherein the width of the secondary wing gradually decreases in a direction from the end close to the main wing to the end far from the main wing;
and/or the thickness of the auxiliary wing gradually decreases from one end close to the main wing to one end far away from the main wing;
and/or a pin shaft is arranged between the main wing and the auxiliary wing, and the main wing and the auxiliary wing are rotationally connected through the pin shaft.
6. The wind blade as claimed in any one of claims 1 to 5, wherein the main wing comprises a first main wing, a second main wing and a middle wing, wherein one end of the middle wing close to the first main wing is connected with the first main wing, and one end of the middle wing far from the first main wing is connected with the second main wing.
7. The wind turbine blade as claimed in claim 6, wherein the end of the intermediate wing close to the first main wing is spliced with the first main wing, and the end of the connection wing far from the first main wing is spliced with the second main wing.
8. The wind blade of any one of claims 1-5 wherein the secondary wing comprises a second windward side and a second leeward side, the second windward side being an inwardly concave rough side and the second leeward side being an outwardly convex smooth side;
and/or the auxiliary wing comprises a second windward side edge and a second leeward side edge, wherein the second windward side edge is a curved surface, and the second leeward side edge is a curved line;
the thickness of the auxiliary wing gradually decreases in the direction from the second windward side edge to the second leeward side edge.
9. Wind turbine blade according to any of claims 1 to 5, wherein the width of the secondary wing at the end close to the main wing is larger than the width of the second end of the main wing.
10. A wind power plant comprising a shaft and a plurality of wind power blades as claimed in any one of claims 1 to 9, said plurality of wind power blades being mounted on said shaft.
CN202111543989.7A 2021-12-16 2021-12-16 Wind power blade and wind power generation device Pending CN114215684A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101225794A (en) * 2008-01-25 2008-07-23 严强 Blade structure, wind wheel and generator device of vertical axis wind power generator
CN201297234Y (en) * 2008-10-10 2009-08-26 王金楼 Impeller unit for vertical axis wind and hydroelectric generators
DE102010046711A1 (en) * 2009-09-28 2011-04-21 Smart Blade Gmbh Rotor blade for wind power plant, has main wing including leading edge, profile surface and trailing edge, and auxiliary wing arranged at specific distance from profile surface of main wing during operation
FR2975138A1 (en) * 2011-05-12 2012-11-16 Benoit Castagnou VERTICAL AXIS ROTOR OF THE DARRIEUS TYPE AND WIND TURBINE EQUIPPED WITH SUCH A ROTOR
WO2014006542A2 (en) * 2012-07-05 2014-01-09 Nelson Mandela Metropolitan University Turbine arrangement
CN109826749A (en) * 2019-02-21 2019-05-31 清华大学 A kind of auxiliary wing variable pitch and can self-starting large-scale darrieus blower

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101225794A (en) * 2008-01-25 2008-07-23 严强 Blade structure, wind wheel and generator device of vertical axis wind power generator
CN201297234Y (en) * 2008-10-10 2009-08-26 王金楼 Impeller unit for vertical axis wind and hydroelectric generators
DE102010046711A1 (en) * 2009-09-28 2011-04-21 Smart Blade Gmbh Rotor blade for wind power plant, has main wing including leading edge, profile surface and trailing edge, and auxiliary wing arranged at specific distance from profile surface of main wing during operation
FR2975138A1 (en) * 2011-05-12 2012-11-16 Benoit Castagnou VERTICAL AXIS ROTOR OF THE DARRIEUS TYPE AND WIND TURBINE EQUIPPED WITH SUCH A ROTOR
WO2014006542A2 (en) * 2012-07-05 2014-01-09 Nelson Mandela Metropolitan University Turbine arrangement
CN109826749A (en) * 2019-02-21 2019-05-31 清华大学 A kind of auxiliary wing variable pitch and can self-starting large-scale darrieus blower

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