A blade with a vortex generator

Abstract

The present invention belongs to the technical field of wind power generation, and specifically relates to a blade with a vortex generator, including a blade and a vortex generator, wherein the blade is provided with a vortex generator, and the vortex generator is a spherical convex vortex generator protruding outwardly on the surface of the blade to form a spherical convexity or a spherical concave vortex generator concave inwardly. The present invention generates a disturbed vortex by arranging a vortex generator on the blade, thereby realizing the function of the vortex generator to delay or prevent flow separation, thereby improving the wind energy capture efficiency of the blade.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a blade with a vortex generator. Background Art

[0002] Blades are the core components of wind turbines. The aerodynamic characteristics of blades directly affect their efficiency in capturing wind energy, and thus the power output of wind turbines. Modern wind turbine blades are usually equipped with vortex generators to delay or prevent flow separation that may occur at the root of the blade or most of the blade span, so that the blades maintain good lift characteristics and ensure the power output of the wind turbine.

[0003] Existing vortex generators generally add specific pneumatic accessories to the surface of the blade, which requires additional production of pneumatic accessories and positioning and gluing and fixing them on the blade surface. The positioning process of such pneumatic accessories is complicated, and the gluing and fixing process also needs to be tested after long-term operation, which increases the engineering cost and operation and maintenance cost of wind turbines. Summary of the invention

[0004] The present invention provides a blade with a vortex generator to solve the technical problem of difficult positioning and installation of a conventional vortex generator and improve the lift characteristics of the blade.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A blade with a vortex generator comprises a blade and a plurality of vortex generators arranged on the blade. The vortex generators are convex vortex generators protruding outwards on the blade surface to form spherical protrusions or concave vortex generators concave inwards.

[0007] A further improvement of the present invention is that the width of the vortex generator is 10 mm to 300 mm, and the length of the protrusion or depression is 10 mm to 100 mm.

[0008] A further improvement of the present invention is that the width of the vortex generator is 1 to 10 times the length of its corresponding protrusion or depression.

[0009] A further improvement of the present invention is that the cross section of the vortex generator is elliptical, teardrop-shaped or streamlined.

[0010] A further improvement of the present invention is that the vortex generators are arranged in one or more rows on the surface of the blade (1) along the airflow direction, and are all located in the area between the suction surface flow separation starting line corresponding to the cut-in wind speed of the wind turbine and the suction surface flow separation starting line corresponding to the cut-out wind speed.

[0011] A further improvement of the present invention is that when the plurality of vortex generators are arranged in multiple rows on the blade (1), they can be arranged in series, in staggered rows, or in an uneven and irregular arrangement.

[0012] A further improvement of the present invention is that the width of the vortex generator and the length of the protrusion or depression are gradually reduced along the direction from the blade root to the blade tip.

[0013] A further improvement of the present invention is that: the blade has a plurality of vortex generators connected end to end to form a transverse rib or transverse groove structure.

[0014] A further improvement of the present invention is that the vortex generator and the blade (1) are integrally made by injection molding.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention provides a vortex generator on the blade to generate a disturbed vortex, thereby realizing the function of the vortex generator to delay or prevent flow separation, thereby improving the wind energy capture efficiency of the blade.

[0017] 2. The present invention integrally molds the vortex generator and the blade by injection molding, which eliminates the need for additional production of pneumatic accessories and the need for positioning and gluing and fixing on the blade surface, thereby improving the stability and reliability of the vortex generator during long-term operation.

[0018] 3. The vortex generator of the present invention is used in the range from the tip to the root of the blade, which can reduce the aerodynamic noise of the blade while enhancing the aerodynamic characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of a spherical convex vortex generator and a blade of a blade with a vortex generator according to the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of a spherical convex vortex generator having a blade of a vortex generator according to the present invention;

[0022] Figure 3 It is a schematic diagram of the overall structure of a spherical concave vortex generator and a blade of a blade with a vortex generator according to the present invention;

[0023] Figure 4 The present invention is a schematic diagram of the structure of a spherical concave vortex generator having a blade with a vortex generator.

[0024] The meanings of the reference numerals are as follows:

[0025] 1. Blade; 2. Spherical convex vortex generator; 3. Spherical concave vortex generator. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0027] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0028] like Figure 1-4 As shown, the present invention provides a blade with a vortex generator, comprising a blade 1 and a plurality of vortex generators, wherein the blade 1 is provided with a plurality of vortex generators.

[0029] The vortex generator is a spherical convex vortex generator 2 that protrudes outwardly on the blade surface to form a spherical protrusion or a spherical concave vortex generator 3 that is concave inwardly.

[0030] The width of the vortex generator is 10 mm to 300 mm, and the length of the protrusion or depression is 10 mm to 100 mm.

[0031] The width of the vortex generator is 1 to 10 times the length of the corresponding protrusion or depression.

[0032] The cross section of the vortex generator is elliptical, teardrop-shaped or streamlined.

[0033] The vortex generators are arranged in one or more rows on the blade surface along the airflow direction and are all located in the area between the suction surface flow separation starting line corresponding to the cut-in wind speed and the suction surface flow separation starting line corresponding to the cut-out wind speed of the wind turbine.

[0034] When the vortex generators are arranged in multiple rows on the blade, they can be arranged in series, staggered, or unevenly and irregularly.

[0035] The width of the vortex generator and the length of the protrusion or depression gradually decreases from the blade root to the blade tip.

[0036] The vortex generator and the blade 1 are integrally formed by injection molding.

[0037] The blade is provided with a plurality of vortex generators which are connected end to end to form a transverse rib or transverse groove structure.

[0038] The working principle of the vortex generator for wind power generation of the present invention is as follows: during the operation of the wind turbine set, the airflow passes over the vortex generator on the surface of the blade 1, generating a disturbed vortex, which brings the energy of the high-speed fluid outside the boundary layer on the blade surface into the boundary layer, thereby increasing the ability of the boundary layer to overcome the adverse pressure gradient and delaying the separation point of the flow boundary layer, thereby increasing the maximum lift coefficient of the blade 1 in the operating condition, improving the lift-to-drag ratio, and further improving the wind energy capture efficiency of the blade 1.

[0039] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A blade with a vortex generator, characterized in that: It comprises a blade (1) and a plurality of vortex generators arranged on the blade (1); The vortex generator is a spherical convex vortex generator (2) protruding outwardly on the surface of the blade to form a spherical protrusion, or a spherical concave vortex generator (3) concave inwardly; the width of the vortex generator is 10 mm to 300 mm, and the length of the protrusion or concave is 10 mm to 100 mm; the width of the vortex generator is 1 to 10 times the length of the corresponding protrusion or concave; The vortex generators are arranged in multiple rows on the surface of the blade (1) along the airflow direction, and are all located in the area between a suction surface flow separation starting line corresponding to a cut-in wind speed of the wind turbine and a suction surface flow separation starting line corresponding to a cut-out wind speed; the plurality of vortex generators are arranged in a staggered pattern on the blade (1); the width of the vortex generators and the length of the protrusions or depressions gradually decrease along the direction from the blade root to the blade tip; the blade (1) and the vortex generators are integrally formed by injection molding.

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