CN220470112U - Wind driven generator blade and wind driven generator system - Google Patents

Abstract

The application discloses a wind driven generator blade and a wind driven generator system. The wind driven generator blade comprises a blade body and a plurality of sawtooth panels, wherein the blade body is fixedly connected with the sawtooth panels, and the plurality of sawtooth panels are continuously or discontinuously distributed at the tail edge position of the middle part of the blade body. The aerodynamic add-on device sawtooth panel can generate additional lifting force for the wind driven generator blade, so that annual energy production of the wind driven generator system is improved.

Description

Wind driven generator blade and wind driven generator system

Technical Field

The application relates to the technical field of wind power generation, in particular to a wind driven generator blade and a wind driven generator system.

Background

Wind power generation is to convert kinetic energy of wind into electric energy, wherein the wind energy is clean and pollution-free renewable energy source and is used by people for a long time. The wind power generation is very environment-friendly, and the wind energy reserve is huge, so that the wind power generation is the main force for reducing carbon emission and realizing the aim of double carbon. The wind power generation installation of China has become the first world, is spread over plains, islands, hills, offshore and other areas, and advances to Sha Ge barren areas, and has great significance for improving the proportion of national green energy sources and improving the national energy source safety.

The principle of wind power generation is that wind power is utilized to drive wind power generator blades to rotate and drive a generator to generate power, the power generation efficiency of the wind power generator has a great relationship with the design of the wind power generator blades, and how to improve the power generation efficiency of the wind power generator by changing the shape of the wind power generator blades is always the subject of research; in addition, the wind turbine blade is noisy during operation due to turbulence near the trailing edge of the blade.

It should be noted that the statements herein merely provide background information related to the present application and may not necessarily constitute prior art.

Disclosure of Invention

In view of the above, the present application proposes a wind turbine blade and a wind turbine system that overcomes or at least partially solves the above-mentioned problems.

The embodiment of the application adopts the following technical scheme:

in a first aspect, embodiments of the present application provide a wind turbine blade, the wind turbine blade includes a blade body and a plurality of sawtooth panels, the blade body with sawtooth panel fixed connection, and a plurality of sawtooth panels are continuous or discontinuous to be distributed in the trailing edge position department at blade body middle part.

Optionally, the blade body is adhered to and fixed with the serrated panel.

Preferably, the saw tooth panel comprises a panel connecting portion and panel saw teeth, the panel saw teeth adopt structures with the same shape, and the panel saw teeth comprise at least one triangle structure.

Preferably, the serrated panel is secured at the trailing edge position of the blade body by the panel connection.

Optionally, the plurality of serrated panels are fixed at the tail edge position of the blade body through the panel connecting part after being continuously spliced and fixed.

Preferably, the plurality of sawtooth panels are unfolded and fixed along the tail edge towards two sides by taking the maximum chord length of the blade as a center.

In a second aspect, embodiments of the present application also provide a wind turbine system comprising a plurality of wind turbine blades as described in any of the first aspects.

The above-mentioned at least one technical scheme that this application embodiment adopted can reach following beneficial effect:

the aerodynamic additional device is arranged at the tail edge position of the middle part of the blade body of the wind driven generator to improve the lift force of the maximum chord length area of the blade, so that the torque and annual energy generation capacity AEP (Annual energy production) generated by the blade of the wind driven generator are improved. The aerodynamic attachment in the present application comprises a serrated panel which has a noise reducing effect in addition to an increase in annual energy production AEP.

The foregoing description of the embodiments of the present application is merely an overview of the embodiments of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above and other objects, features and advantages of the present application more readily apparent, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is an overall schematic of a wind turbine blade according to an embodiment of the present application;

FIG. 2 is a schematic view of a saw tooth face structure in a blade of a wind turbine in an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of a blade of a wind turbine in an embodiment of the present application;

FIG. 4 is a simulated CFD diagram of an embodiment of the present application;

FIG. 5 is a graph of tangential force lift versus an embodiment of the present application.

Detailed Description

For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The conception of this application lies in, to how to improve the lifting force of current aerogenerator blade, proposes the improvement of a aerogenerator blade structure, through set up a plurality of continuous or discontinuous sawtooth panels in the trailing edge position at blade body middle part, improves the lifting force of aerogenerator blade to improve aerogenerator's annual energy production, can reduce the noise in the operation of aerogenerator blade to a certain extent simultaneously.

The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.

The physical principle of blade rotation of wind generators is mainly aerodynamic. According to Bernoulli's principle, when the air flow passes the suction side of the blade, the wind speed is faster, the pressure is smaller, and the wind speed is slower and the pressure is greater on the pressure side of the blade, thus creating a pressure difference across the blade, which pushes the movement of the blade. Changes in wind direction and speed, weight and stiffness of the blades, capacity of the drive train, etc. also affect the movement of the blades. Therefore, these factors need to be taken into account in designing and optimizing wind power blades to achieve higher efficiency and reliability.

Aerodynamic analysis of wind turbine blades is required at the beginning of their design in order to increase the lift in the maximum chord area of the blade as much as possible, thereby increasing the torque produced and Annual Energy Production (AEP). The maximum chord area of the blade is a unification of aerodynamics and structure. The cross section of the blade is relatively thick (typically greater than 30% of the thickness to chord) to ensure adequate structural rigidity; however, this means that aerodynamic performance is affected. Blade designers cannot create a geometry that produces optimal lift to produce optimal lift. In this case, the application uses aerodynamic appendages to generate additional lift.

The embodiment of the application provides a wind driven generator blade and wind driven generator system, as shown in fig. 1, and provides a schematic diagram of the wind driven generator blade in the embodiment of the application, as can be seen from fig. 1, the wind driven generator blade includes a blade body 1 and a plurality of saw tooth panels 2, the blade body 1 and the saw tooth panels 2 are fixedly connected, and the plurality of saw tooth panels 2 are continuously or discontinuously distributed at the tail edge position of the middle part of the blade body.

In a specific example of the present application, the blade body 1 and the serration panel 2 are fixed by an adhesive, such as a strong glue. In this way, wind turbine blades without a serrated panel may be retrofitted to increase the lifting force of the blade.

The length of the sawtooth panel of the blade used in the large wind driven generator is set according to the result of computational fluid dynamics CFD simulation, for example, a specific sawtooth panel can be set to be 50cm, each sawtooth panel is provided with a plurality of triangular sawteeth which are distributed continuously, and the number of the triangular sawteeth on one sawtooth panel is also required to be determined according to the result of computational fluid dynamics CFD simulation, for example, four sawtooth panels can be used as shown in fig. 2. The specific number of the saw tooth panels and the positions of the saw tooth panels on the blades are obtained through simulation calculation. Because the blades used by different wind driven generator systems are different in size, the blades of different types are required to be subjected to simulation calculation respectively to obtain the optimal number of the sawtooth panels and specific parameters of the sizes, and then the blades are adhered to the tail edge positions of the blade bodies after being manufactured. In order to achieve a better effect of the lifting force of the blade, the plurality of saw-tooth panels are unfolded and fixed to two sides along the tail edge by taking the maximum chord length of the blade as the center. As an optimal layout, the longitudinal symmetry axis of the plurality of saw tooth panels after being pasted coincides with the central axis at the maximum chord length.

In some examples of the present application, the blade body is affixed to the serrated panel. Because the complexity of the wind driven generator blade manufacturing die is very high, the difficulty of integrally forming the sawtooth panel on the blade body is very high, and the structural stability of the blade can be influenced to a certain extent by using the fastening device, even the running noise can be increased, so that the sawtooth panel is bonded with the blade body through a specific adhesive as a possible implementation mode, and the sawtooth panel is firm and more consistent with aerodynamic design.

In some examples of the present application, the serrated panel includes a panel connection and panel serrations employing the same shaped structure.

As shown in fig. 2, in the embodiment of the application, the saw-tooth panel 2 is composed of a connecting portion 21 at the lower part of the panel and triangular saw-teeth 22 at the upper part, and the two parts can be adhered or integrally formed by using an adhesive, wherein the triangular saw-teeth have the same shape or different shapes, and in practical application, the saw-tooth shapes are specifically set according to the CFD simulation result. FIG. 2 is only one example of a serration panel of the present application, the size of which and the number of triangular serrations, after CFD simulation, determines the optimal configuration according to the size of the wind turbine blade.

In some examples of the present application, the serrated panel is secured 21 by the panel connection at the trailing edge position of the blade body.

As shown in fig. 3, in the enlarged partial view of the blade of the wind turbine in the embodiment of the present application, it can be seen that the saw tooth surface plate is fixed at the tail edge position of the blade body by the connection portion at the lower portion of the saw tooth surface plate, and the triangular saw teeth at the upper portion of the saw tooth surface plate are protruded outside the middle position of the blade tail edge, so as to be used as the extension of the blade tail edge.

In some examples of the present application, the fixing 21 of the panel connecting portion is fixed at the trailing edge position of the blade body after a plurality of saw-tooth panels are continuously spliced, so that structural errors caused by splicing and installation of the saw-tooth panels are avoided, and the lifting force of the wind turbine blade is affected.

In some examples of the present application, the plurality of serrated panels are fixed along the trailing edge on both sides with the maximum chord length of the blade as a center.

Since the blade sizes of different wind power generator systems are different, the size and number of saw tooth panels to be attached to the blade body are also different. For a specific blade, the installation positions of the sawtooth panels are unfolded and fixed towards two sides along the tail edge by taking the maximum chord length of the blade as the center, and the number and the size of the specific sawtooth panels are determined according to CFD simulation results.

As shown in fig. 4, a full rotor three-dimensional Computational Fluid Dynamics (CFD) simulation was performed for the wind turbine blade in the present application. CFD simulation is used to optimize the configuration positions and number of configurations of the serrated panels, including span positions and installation lengths of the serrated panel settings. So as to optimize the blade lifting force maximally by modifying the structure. As can be seen from fig. 4, the installation position of the saw-tooth panel is spread along the trailing edge on both sides with the maximum chord length of the blade as the center, and the saw-tooth panel is adhered and fixed to the blade by using an adhesive.

As shown in fig. 5, a tangential force contrast plot was extracted from the entire blade CFD simulation. Tangential force is the torque driving the rotor or turbine and is therefore also power. It can be seen that the addition of a serrated panel to the wind turbine blade significantly increases the forces around the application area. According to simulation calculations, installation of the serrated panel will increase Annual Energy Production (AEP) by about 0.4-0.6% in IEC wind class II.

The wind driven generator blade in the application uses the saw-tooth panel of the aerodynamic additional device, so that not only can extra lifting force be generated, but also the noise in the running process of the wind driven generator blade is reduced to a certain extent.

The embodiment of the application also provides a wind driven generator system which comprises a plurality of wind driven generator blades. Reference is made to the prior art for other parts of the wind turbine system, which are not described in detail herein.

It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above", "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "under" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is level less than the second feature.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (8)

1. A wind turbine blade, the wind turbine blade comprising: blade body and a plurality of sawtooth panel, the blade body with sawtooth panel fixed connection, just a plurality of sawtooth panel are continuous or discontinuous distributes in the trailing edge position department at blade body middle part.

2. The wind turbine blade of claim 1, wherein the blade body is affixed to the serrated panel.

3. The wind turbine blade of claim 1, wherein the serrated panel includes a panel connection and panel serrations, the panel serrations having the same shape.

4. A wind turbine blade according to claim 3, wherein the panel serrations comprise at least one triangular formation.

5. A wind turbine blade according to claim 3, wherein the serrated panel is secured at the trailing edge of the blade body by the panel connection.

6. The wind turbine blade of claim 5, wherein the plurality of serrated panels are secured to the blade body at a trailing edge position after being continuously spliced.

7. The blade of claim 5, wherein the plurality of serrated panels are secured along the trailing edge on both sides centered at the maximum chord of the blade.

8. A wind turbine system comprising a plurality of wind turbine blades according to any of claims 1-7.