CN219220643U - A trailing edge thickening aerodynamic accessory for blade power augmentation - Google Patents

Abstract

The utility model belongs to the technical field of blade power enhancement, and relates to a trailing edge thickening aerodynamic accessory for blade power enhancement, including a connecting piece and a spoiler; the connecting piece is wrapped on the blade trailing edge, and the spoiler is connected to the connecting piece The lower surface of the tail end; the end of the connector connected to the blade trailing edge is composed of an upper flange and a lower flange, and a special-shaped groove for wrapping the blade trailing edge is formed between the upper flange and the lower flange, and the inner surface of the upper flange It is bonded to the suction surface of the blade trailing edge, and the inner surface of the lower flange is bonded to the pressure surface of the blade trailing edge. The connector extends the chord length of the blade section, which can increase the area of the blade to capture wind energy to achieve the goal of increasing the power generation of the unit; Sensitivity to the roughness of the leading edge; the added spoiler can increase the pressure difference between the upper and lower surfaces of the airfoil and improve the vortex, and together achieve the purpose of increasing the power and efficiency of the blade.

Description

A trailing edge thickening aerodynamic accessory for blade power augmentation

technical field

The utility model belongs to the technical field of blade power augmentation, in particular to a trailing edge thickening pneumatic accessory for blade power augmentation.

Background technique

Wind turbine blades are the components used by wind turbines to capture wind energy. During the design of the blades, aerodynamic performance, structural safety, and impact on the environment must be considered comprehensively. Most early wind turbine blades were designed with sharp trailing edges to ensure that the impact of aerodynamic noise is small. In recent years, with the development of wind power technology, more and more long and flexible blades have begun to consider adopting the blunt trailing edge design to achieve the purpose of reducing the roughness sensitivity of the leading edge of the blade and improving quality and efficiency. The blades of the unit are still troubled by the degradation of the aerodynamic performance of the blades and the early separation of the airflow caused by factors such as front edge dirt and corrosion. The main reason is that after long-term operation of the in-service wind turbines, the leading edge of the wind turbines in service is affected by insect corpses, surface pitting, wind and sand erosion, dust and dirt, etc. As the airflow continues to flow along the chord direction of the blade, the adhesion decreases due to the premature transition, and it is easy to develop a vortex at the trailing edge, which in turn affects the flow state of the airflow near the leading edge, and a dynamic stall phenomenon occurs.

For the above problems, the industry is increasingly adopting the method of installing aerodynamic power increasing and drag reducing accessories on the outer surface of the blade to improve the ability of the blade to capture wind energy or reduce the roughness sensitivity of the leading edge. Common methods are mainly Gurney flaps or trailing edge dovetails, both of which only improve the trailing edge Kutta conditions, and the wind energy capture capacity is still relatively weak.

Therefore, the aerodynamic optimization design of airfoils and blades and the power booster are still one of the research hotspots for improving the quality and efficiency of wind turbines in service at the current stage.

Utility model content

The purpose of the utility model is to provide a trailing edge thickened aerodynamic accessory for increasing blade power, which solves the problem of single function of the existing aerodynamic power increasing and drag reducing accessories.

The utility model is realized through the following technical solutions:

An aerodynamic accessory for thickening the trailing edge for blade power enhancement, including a connecting piece and a spoiler, the connecting piece is used for thickening the trailing edge of the blade and increasing the chord length of the section;

The connecting piece is wrapped around the trailing edge of the blade, and the spoiler is connected to the lower surface of the tail end of the connecting piece;

The end of the connecting piece connected to the blade trailing edge is composed of an upper flange and a lower flange. A special-shaped groove for wrapping the blade trailing edge is formed between the upper flange and the lower flange. The inner surface of the upper flange and the suction force of the blade trailing edge Surface bonding, the inner surface of the lower flange is bonded to the pressure surface of the blade trailing edge;

The shape of the bonded area follows the corresponding suction and pressure surfaces of the blade trailing edge.

Further, the connecting piece is glued to the trailing edge of the blade.

Further, the inner surfaces of the upper flange and the lower flange are bonding areas, and the bonding areas are rough surfaces.

Further, the length from the front edge of the lower flange to the minimum thickness of the bonding area of the connector is L1, and the length from the front edge of the upper flange to the minimum thickness of the bonding area of the connector is L2;

30mm<L1<0.1*c, 30mm<L2<0.1*c;

Among them, c represents the chord length of the blade body section corresponding to the bonding position.

Further, the minimum thickness of the bonding area of the connector is Ld, the thickness of the most edge of the trailing edge of the original blade in the bonding area is d, and Ld>d+3mm.

Further, the thickness of the trailing edge of the connecting piece is Td, and Td satisfies: d<Td<L, L is the length from the trailing edge of the connecting piece to the minimum thickness of the bonding area of the connecting piece, and d is the thickness of the trailing edge of the original blade in the bonding area.

Further, the height of the spoiler is Fh, 0mm≤Fh≤50mm.

Further, the thickness of the spoiler is Fd, 1mm<Fd<3mm.

Further, the included angle between the spoiler and the trailing edge of the connector is θ, and 90°≤θ≤180°.

Further, the spanwise length LL of the connector satisfies 200mm≤LL≤500mm.

Compared with the prior art, the utility model has the following beneficial technical effects:

The utility model provides a trailing edge thickening aerodynamic accessory for blade power augmentation, which is an aerodynamic power augmentation accessory covering blade trailing edge thickening, chord extension and flow turbulence, including a connecting piece and a spoiler, The connector extends the chord length of the blade section, which can increase the area of the blade to capture wind energy to achieve the goal of increasing the power generation of the unit; Sensitivity to the roughness of the leading edge; the added spoiler can increase the pressure difference between the upper and lower surfaces of the airfoil and improve the vortex, and together achieve the purpose of increasing the power and efficiency of the blade.

Further, the angle between the spoiler and the trailing edge of the connector is θ, and θ satisfies 90°≤θ≤180°, increasing the pressure difference between the pressure surface and the suction surface and changing the Kutta condition.

Furthermore, in order to ensure safe and efficient installation, the spanwise length LL of the attachment should satisfy 200mm≤LL≤500mm. After exceeding 500mm, the angle of attack corresponding to the maximum lift-to-drag ratio becomes smaller, which affects the overall aerodynamic performance of the original blade.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a trailing edge booster aerodynamic accessory;

Fig. 2 is a front view of Fig. 1 .

Wherein, 1. connecting piece; 2. spoiler; 11. upper flange; 12. lower flange.

Detailed ways

In order to make the purpose, technical solution and advantages of the present utility model clearer, further detailed description will be given below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present utility model, and are not used to limit the present utility model, that is, the described embodiments are only some embodiments of the present utility model, rather than all embodiments.

The components described and shown in the drawings and embodiments of the present invention can be arranged and designed in various configurations, therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the claimed invention The scope of the utility model, but only represents a selected embodiment of the utility model. Based on the drawings and embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

It should be noted that the term "comprises", "comprises" or any other variant thereof is intended to cover a non-exclusive inclusion such that a process, element, method, article or device comprising a set of elements includes not only those elements, but also includes other elements not expressly listed, or also includes elements inherent in the process, element, method, article or apparatus. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for better description of the present utility model, rather than requiring that the devices, components or equipment shown must have this Specific orientation, therefore, should not be construed as a limitation of the present invention.

Below in conjunction with embodiment the feature and performance of the present utility model are described in further detail.

As shown in Figure 1, the utility model discloses a trailing edge thickening aerodynamic accessory for blade power enhancement, including a connecting piece 1 and a spoiler 2, the connecting piece 1 can realize blade trailing edge thickening and section chord length Increase. The connector 1 is bonded to the trailing edge of the blade, and the shape of the bonding area follows the corresponding suction surface and pressure surface of the trailing edge of the blade.

One end of the connector 1 connected to the trailing edge of the blade is composed of an upper flange 11 and a lower flange 12. A special-shaped groove for wrapping the trailing edge of the blade is formed between the upper flange 11 and the lower flange 12. The inner part of the upper flange 11 The surface is bonded to the suction surface of the blade trailing edge, and the inner surface of the lower flange 12 is bonded to the pressure surface of the blade trailing edge.

As shown in Figure 2, the position indicated by A is the connection area between this accessory and the blade body, the length of L2 corresponds to the suction surface (SS surface) of the blade trailing edge; L1 corresponds to the pressure surface (PS surface) of the blade trailing edge, and the connection method is to use One-component catalytic structural adhesive or multi-component rapid structural adhesive bonding form.

During installation, the surface roughness of the bonding area A needs to be polished to improve bonding reliability.

As shown in FIG. 2 , L1 is the length from the front edge of the lower flange 12 to the minimum thickness of the bonding area of the connector 1 , and L2 is the length from the front edge of the upper flange 11 to the minimum thickness of the bonding area of the connector 1 .

30mm<L1<0.1*c, c indicates the chord length of the blade body section corresponding to the bonding position, the minimum initial length is not less than 30mm to ensure the firmness, reliability and safety of the bonding, the same 30mm<L2<0.1*c;

More preferably, the pressure surface side of the attachment is in contact with the external airflow and the area B close to the leading edge surface can be properly roughened, so as to affect the influence of the trailing edge shedding vortex on the upper surface airflow separation;

Ld represents the minimum thickness of the bonding area of connector 1, and d represents the thickness of the trailing edge of the original blade in the bonding area. In order to avoid problems such as empty glue and no glue, it is necessary to ensure that Ld>d+3mm.

The thickness of the trailing edge of the connector 1 is Td, and Td should satisfy: d<Td<L, where L is the length from the trailing edge of the connector 1 to the minimum thickness of the bonding area of the connector 1.

The spoiler 2 is arranged on the lower surface of the tail end of the connector, and its height Fh, thickness Fd and angle with the connector 1 are all optional designs; as shown in Figure 2, for the spoiler 2, 0mm≤Fh≤ 50mm, 1mm<Fd<3mm, θ satisfies 90°≤θ≤180°, increase the pressure difference between the lower surface, that is, the pressure surface and the upper surface (suction surface), and change the Kutta conditions.

As shown in Figure 1, in order to ensure safe and efficient installation, the spanwise length LL of the attachment should satisfy 200mm≤LL≤500mm. After exceeding 500mm, the angle of attack corresponding to the maximum lift-drag ratio becomes smaller, which affects the overall aerodynamic performance of the original blade.

The accessory materials can be produced with 2-3 layers of biaxial fiberglass cloth and epoxy resin and other homologous materials for the blades, or high-strength plastics can be selected for production. When selecting high-strength plastics, a weather resistance test should be carried out to ensure that its strength can meet 20 year life requirements.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible Any modification or equivalent replacement made to the specific implementation of the present utility model without departing from the spirit and scope of the present utility model shall be covered within the protection scope of the claims of the present utility model.

Claims (10)

1. A trailing edge thickening aerodynamic accessory for blade power augmentation, characterized in that it comprises a connector (1) and a spoiler (2), and the connector (1) is used to thicken the blade trailing edge and increase the section chord length; The connecting piece (1) is wrapped around the trailing edge of the blade, and the spoiler (2) is connected to the lower surface of the tail end of the connecting piece (1); One end of the connector (1) connected to the trailing edge of the blade is composed of an upper flange (11) and a lower flange (12), and an upper flange (11) and a lower flange (12) are formed between the upper flange (11) and the lower flange (12) for wrapping the trailing edge of the blade. The special-shaped groove, the inner surface of the upper flange (11) is bonded to the suction surface of the blade trailing edge, and the inner surface of the lower flange (12) is bonded to the pressure surface of the blade trailing edge; The shape of the bonded area follows the corresponding suction and pressure surfaces of the blade trailing edge. 2. A trailing edge thickening aerodynamic accessory for blade power increase according to claim 1, characterized in that the connecting piece (1) is glued to the blade trailing edge. 3. A trailing edge thickened aerodynamic accessory for blade power augmentation according to claim 1, characterized in that, the inner surfaces of the upper flange (11) and the lower flange (12) are bonded areas, the The bonding area is a rough surface. 4. A trailing edge thickening aerodynamic accessory for blade power augmentation according to claim 1, characterized in that, the distance from the front edge of the lower flange (12) to the minimum thickness of the bonding area of the connecting piece (1) The length is L1, and the length from the front edge of the upper flange (11) to the minimum thickness of the bonding area of the connector (1) is L2; 30mm<L1<0.1*c, 30mm<L2<0.1*c; Among them, c represents the chord length of the blade body section corresponding to the bonding position. 5. A kind of trailing edge thickened aerodynamic accessory for blade power augmentation according to claim 1, it is characterized in that, the minimum thickness of the bonding area of the connector (1) is Ld, and the trailing edge of the original blade in the bonding area The thickness of the most edge is d, Ld>d+3mm. 6. A trailing edge thickened aerodynamic accessory for blade power augmentation according to claim 1, characterized in that the thickness of the trailing edge of the connector (1) is Td, and Td satisfies: d<Td<L, L is the length from the trailing edge of the connecting piece (1) to the minimum thickness of the bonding area of the connecting piece (1), and d is the thickness of the trailing edge of the original blade in the bonding area. 7. A trailing edge thickening aerodynamic accessory for blade power increase according to claim 1, characterized in that the height of the spoiler (2) is Fh, 0mm≤Fh≤50mm. 8. A trailing edge thickening aerodynamic accessory for blade power augmentation according to claim 1, characterized in that the thickness of the spoiler (2) is Fd, 1mm<Fd<3mm. 9. A trailing edge thickening aerodynamic accessory for blade power augmentation according to claim 1, characterized in that the angle between the spoiler (2) and the trailing edge of the connector (1) is θ, 90° ≤θ≤180°. 10. The trailing edge thickening aerodynamic accessory for blade power augmentation according to claim 1, characterized in that the spanwise length LL of the connecting piece (1) satisfies 200mm≤LL≤500mm.

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