KR20200018837A - A Guiding Duct for a Wind Generator and the Wind Generator with the Same - Google Patents

Abstract

The present invention relates to a guiding duct for a wind power generator and a wind power generator having the same and, specifically, to a guiding duct for a wind power generator, capable of improving power generation efficiency of a wind power generator by effectively guiding a fluid to a rotation blade of the wind power generator, and a wind power generator having the same. The guiding duct for a wind power generator includes: an inlet (11) in which wind flows; an outlet (13) discharging the wind rotating the blade; and a flow path (12) connecting the inlet (11) and the outlet (13) and having the surface of a cycloid structure. The cross-section area of the inlet (11) is smaller than that of the outlet (13). Also, the length of the flow path (12) is the same as or smaller than the radius of an inflow cross-section area of the inlet (11).

Description

A guiding duct for a wind generator and the wind generator with the same}

The present invention relates to an induction duct for a wind generator and a wind generator having the same, and more particularly, to an induction duct for a wind generator and a wind generator having the same to effectively induce fluid into a rotary blade of the wind generator to improve the power generation efficiency of the wind generator. It is about.

Wind power, which uses electricity to generate electricity, is a clean energy that becomes renewable energy and does not cause environmental pollution. As the natural conditions suitable for wind power generation are formed, the structural design needs to be made accordingly. And the structural design needs to be made in a way that can efficiently induce wind and convert it into electrical energy. Various structures for improving the efficiency of wind power generation are known in this field, and Patent Publication No. 10-2010-0135058 uses a dual rotor to continuously generate power even at low wind speeds, and a duct is provided to increase wind flow rate. The duct-type wind power generator of the dual rotor system to increase the power generation efficiency is disclosed. International Publication No. WO 2015/158788 also discloses an air duct for a wind power plant which is formed for directing air along the circumference of an ellipse. The duct disclosed in the prior art is formed to be inclined from the inlet to the outlet, or formed of a plurality of segments. However, such a duct structure is not based on analysis of various fluid flows, and thus has a disadvantage in that it is insufficient to improve the efficiency of wind power generation. Wind power needs to be designed based on the pressure inside or outside the duct, for example based on Bernoulli's law or Betz's law. And it is advantageous to be designed to minimize the noise generated during the wind power generation process. However, the prior art does not disclose a duct structure having such a structure.

The present invention is to solve the problems of the prior art has the following object.

Prior Art 1: Patent Publication No. 10-2010-0135058 (Gwangju Institute of Science and Technology, released on December 24, 2010) Dual rotor type duct type wind power generator Prior Art 2: International Publication No. WO 2015/158788 (Arepa Vint GmbH, published October 22, 2015) Air ducts for wind power plants, methods for manufacturing wind power plants, air ducts and methods for retrofitting wind power plants with air ducts

It is an object of the present invention to provide an induction duct for a wind generator and a wind generator having the same, in which the inlet and the outlet are connected in a cycloid shape while the outlet has a narrow cross-sectional area and an outlet having a wide cross-sectional area, thereby improving power generation efficiency.

According to a preferred embodiment of the present invention, an induction duct for a wind generator and a wind generator having the same include: an inlet through which wind is introduced; An outlet through which wind for rotating the blades is discharged; And a flow path having a surface of the cycloid structure connecting the inlet and the outlet, wherein the cross-sectional area of the inlet is smaller than the cross-sectional area of the outlet, and the length of the flow path is equal to or smaller than the radius of the inlet cross-sectional area of the inlet.

According to another suitable embodiment of the present invention, it further comprises a visor formed on the circumferential surface of the outlet.

According to another suitable embodiment of the present invention, there is provided an apparatus, comprising: an induction duct in which the inflow cross section is smaller than the outlet cross section and the inner circumferential surface of the flow path is a cycloid structure; And a rotating blade disposed adjacent the outlet in the interior of the induction duct, wherein the inflow cross section is circular, and the length of the flow path is equal to or smaller than the radius of the inflow cross section.

Wind turbine duct according to the present invention is designed based on the change in pressure of the inside and outside of the fluid flow to increase the efficiency of wind power generation. The duct according to the invention allows the pressure to be effectively controlled at the site where the stream contacts the blade by forming a visor at the outlet. In addition, the wind generator according to the present invention is to improve the power generation efficiency while the noise is reduced by allowing the wind flows through the duct formed in the inner surface of the cycloid structure.

1 shows an embodiment of a duct according to the invention.
2 shows an embodiment of the geometry of a duct according to the invention.
Figure 3 illustrates an embodiment of a structure in which a duct according to the present invention is installed in a wind generator.
4 shows an embodiment of a wind generator according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the embodiments set forth in the accompanying drawings, but the embodiments are provided for clarity of understanding and the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, and thus are not repeatedly described unless necessary for the understanding of the invention, and well-known components are briefly described or omitted. It should not be understood to be excluded from the embodiment of.

1 shows an embodiment of a duct according to the invention.

Referring to FIG. 1, the wind generator duct includes an inlet 11 through which wind is introduced; An outlet 13 through which wind for rotating the blades is discharged; And a flow path 12 having a surface of a cycloid structure connecting the inlet 11 and the outlet 13, the cross-sectional area of the inlet 11 being smaller than the cross-sectional area of the outlet 13. The length of 12 is equal to or smaller than the radius of the inlet cross-sectional area of the inlet 11.

The duct may have a function of directing wind or air to the blades of the wind generator, and the wind or air guided into the interior of the duct may rotate the blades and discharge out of the duct. The blade may be installed adjacent to the inlet 11, flow path 12 or outlet of the duct, and the duct may be sized such that the blade can be placed inside, front or back, depending on the structure of the blade.

Wind may enter the interior of the duct through the inlet 11, and the inlet 11 may have a variety of cross-sectional areas, but may preferably have a circular cross-sectional area. Wind introduced through the inlet 11 can flow along the flow path 12 forming a stream. And the blade disposed inside the duct can be rotated and discharged to the outside through the outlet (13). The outlet 13 may have the same or different cross-sectional shape as the inlet 11 and may preferably have a circular cross-sectional area. In this way, the wind flowing through the inlet 11 flows along the flow path 12 and is discharged through the outlet 13 so as to efficiently rotate the blades, so that it is necessary to produce the maximum power. . For this purpose, the size of the cross-sectional area of the inlet may be smaller than that of the outlet 13. For example, the size of the cross-sectional area of the inlet 11 may be 1/15 to 4/15, preferably 1/5 to 3/5, most preferably 1/4 of the size of the cross-sectional area of the outlet 13 It is not limited. Once the relative sizes of the inlet 11 and outlet 13 are determined, the length of the flow path 12 can be determined based thereon. The length of the flow path 12 means a linear distance connecting the center of the inlet 11 and the center of the outlet 13 or the shortest distance from the inlet 11 to the outlet 13. The length of this flow path 12 may be equal to or smaller than the radius of the cross-sectional area of the inlet 11, for example the length of the flow path 12 may be from one fifth of the radius of the cross-sectional area of the inlet 11. 4/5, preferably 2/5 to 3/5, most preferably 1/2. Wind introduced into the duct by the structure of the duct can effectively rotate the blades and be discharged to the outside of the duct. Due to the inlet 11 and the outlet 13 having different sizes of cross sections, the flow velocity and pressure of the air may be different at different positions in the longitudinal direction of the flow path 12. In order to properly adjust the flow of air in the flow path 12 to maximize the rotational speed of the rotating blade, the inner surface of the flow path 12 which is in contact with the air has a cycloid structure along the length direction. It is advantageous. In such a cycloid structure the pressure or speed may vary non-linearly along the flow path of air and the rotating blade may be located inside the flow path 12 based on the change in pressure or speed. This cycloid structure of the flow path 12 will be described again below. As shown in FIG. 1, the duct may be generally trumpet shaped, and the inlet 11 and outlet 13 may each have a circular cross section. In such a structure, the outlet diameter D2 may be 1.5 to 3 times the inlet diameter D1. Alternatively the inlet 11 and outlet 13 can be determined in the size of the cross-sectional area, as described above. And the flow space length (L1) may be 1/10 to 1/2 of the inlet diameter (D1), for example, may be a quarter of the inlet diameter (D1), but is not limited thereto.

2 shows an embodiment of the geometry of a duct according to the invention.

Referring to FIG. 2, when the duct is viewed in the direction of the inlet 11, the duct may have a torus or circular band shape, and the visor 21 may be coupled to the outlet 13 of the duct. The visor 21 may have a structure that can be coupled to the outlet 13, and may have a circular band or annular shape whose inner diameter is the same as the outer diameter of the outlet 13. And the width along the radial direction of the annular visor 21 may be 1/10 to 1/2, preferably 1/5 to 2/5, most preferably 1/4 of the radius of the inlet 11 This is not restrictive. The visor 21 may be coupled to the circumferential surface of the outlet 13 in a direction perpendicular to the flow path of the air, whereby a vortex is generated in the rear portion of the visor 21 or the rear of the visor 21. Ensure the part is kept at low pressure. This allows the air in the duct to be discharged to the outside of the duct at a high speed. The coupling of the visor 21 to the outlet 13 can create a resistance to the flow of air at the outer circumferential surface of the duct. As a result, air may not be smoothly introduced into the inlet 11. In order to solve this problem, the visor 21 may be coupled to the outlet 13 so as to be inclined with respect to the flow direction of the air, whereby the flow of air along the outer circumferential surface of the duct may be made flexible. Alternatively, the visor 21 may be coupled to the outlet 13 to have elasticity, and for example, the visor 21 may be formed to be inclined with respect to the flow path when the wind speed is above a predetermined level. The visor 21 may for example be at least 100 degrees with respect to the direction of the flow path. Alternatively, the inclination adjustment means of rubber or elastic synthetic resin material may be coupled to the inner circumferential surface of the visor 21, and the inclination adjustment means is connected to the outlet 13 so that the visor 21 is perpendicular to the flow path by an adhesive means. Can be combined. As such, the inclination angle may be adjusted according to the flow velocity of air of the visor 21 coupled to the outer circumferential surface of the outlet 13 by the inclination adjusting means. The visor 21 may be made in a vertical or inclined structure while being coupled to the outlet 13 in a rigid structure. Alternatively, the visor 21 may be coupled to the outlet 13 in a structure capable of tilt adjustment according to the flow speed of air flowing along the outer circumferential surface of the flow path 12.

Referring to the lower part of FIG. 2, the inner circumferential surface connecting the inlet 11 and the outlet 13 may be a linear inclined surface SL but preferably a cycloid curved surface C1, C2, C3. have. The linear inclined surface SL has a structure in which the inlet 11 and the outlet 13 are connected in a conical shape. Cycloid curved surfaces C1, C2, C3 or hypercyloid curved surfaces may be created by rotating circles having different radii along a linear sloped surface SL. Each point on the circumference forming the inlet 11 is connected to each other by a cycloid curve with each point on the circumference forming the outlet, whereby the flow path 12 has various forms of cycloid curved surfaces C1 and C2. , C3). As the inlet strip In flowing through the inlet 11 flows along the cycloid curved surfaces C1, C2, and C3, the pressure or speed may be changed nonlinearly. And the rotary blades can be rotated by the nonlinear streams FS1, FS2 formed in the flow path 12, and the flow speed or pressure of air at each position of the flow path 12 can be calculated. And based on that, the blade position BP may be selected. In the illustrated embodiment, the blade position BP is shown as the end of the cycloid surfaces C1, C2 and C3, but this is illustrative and the rotating blades are the shape of the cycloid surfaces C1, C2 and C3 and the resulting analysis. It may be arranged in various locations based on the base and is not limited to the embodiment shown.

3 illustrates an embodiment of a structure in which a duct according to the present invention is installed in a wind generator.

Referring to FIG. 3, the wind generator includes an induction duct in which the inflow cross section is smaller than the outlet cross section and the inner circumferential surface of the flow path is a cycloid structure; And a rotating blade 32 disposed adjacent the outlet in the interior of the induction duct, wherein the inflow cross section is circular, and the length of the flow path is equal to or smaller than the radius of the inflow cross section.

A nacelle may be installed above the tower 31 for installation of the wind generator, and the rotary blade 32 may be coupled to the front of the nacelle. A rotating blade 32 may be installed inside the induction duct, and the induction duct may be fixed to the tower 31 so as to direct the flow of air to the rotating blade 32. Air introduced through the inlet 11 having a relatively small cross-sectional area may be guided and flow along the flow path 12 to rotate the rotating blade 32. Flow path 12 connecting inlet 11 and outlet 13 may be a cycloid curved shape. The inlet 11 and the outlet 13 can both be circular, the cross-sectional area of the inlet 11 is smaller than the cross-sectional area of the outlet 13, the linear length of the flow path 12 is circular inlet 11 It may be smaller than the radius of. The air introduced through the inlet 11 flows along the flow path 12 to rotate the rotating blade 32 and thus generate power in the nacelle. The power generation characteristics can be determined by the flow characteristics of the air in the flow path 12, and the power generation characteristics of the wind generator having the same or similar structure can be improved by making the induction duct into the structure described above.

4 shows an embodiment of a wind generator according to the present invention.

In order to test the power generation characteristics according to the duct structure according to the present invention, the power generation characteristics were tested by coupling various types of ducts to the wind generator shown in FIG. 4. The test is based on the case in which the visor 21 is formed in the duct according to the present invention and the case in which the visor 21 is not formed, and a control duct having a different structure from that of the duct according to the present invention. Was executed on the basis of Ducts according to the invention were made to the following specifications.

Example Duct

Radius of the inlet and outlet 13: 20 cm and 40 cm

Linear length of flow path 12: 10 cm

Inside diameter and width of the visor (21): 40 cm and 5 cm

Cycloidal surface: A surface with a circular rotation with a radius of 10 cm

Ducts with and without visors 21 become Examples 1 and 2, respectively

Comparative example

(I) when the duct is not coupled (Comparative Example 1), (ii) when the linear length of the flow path 12 is 20 cm (Comparative Example 2), (iii) The case where (12) became a linear inclined plane (comparative example 3) was set as a control duct, respectively, and the size of the inlet 11 and the outlet 13 of a control duct was set to be the same as the duct of an Example. Power generation was measured for different wind speeds, the measurement results are presented in Table 1, and the power generation was expressed in watts (W).

Table 1: Power Generation Test Results Wind speed (m / s) Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 0.9 1.05 1.01 0.47 0.67 0.93 1.5 2.87 2.75 1.37 1.93 2.54 1.9 3.16 3.01 1.39 2.01 2.63 2.4 7.47 7.12 2.08 5.31 6.54 2.8 8.74 8.15 2,97 6.28 7.21 3.0 9.87 9.02 3.29 6.42 8.01 3.5 11.11 10.09 4.13 6.51 8.94 4.3 11.95 10.38 4.76 6.73 9.23

As can be seen from the power generation test results, when the duct is installed, the power generation amount is increased, and the power generation efficiency can be improved by the installation of the visor 21, and it can be seen that the power generation efficiency can be further improved by the cycloid surface. .

Wind turbine duct according to the present invention is designed based on the change in the pressure inside and outside of the fluid flow to increase the efficiency of wind power generation. The duct according to the invention allows the pressure to be effectively controlled at the site where the stream contacts the blade by forming a visor at the outlet. In addition, the wind generator according to the present invention is to improve the power generation efficiency while the noise is reduced by allowing the wind flows through the duct formed in the inner surface of the cycloid structure.

Although the present invention has been described in detail above with reference to the presented embodiments, those skilled in the art may make various modifications and modifications without departing from the technical spirit of the present invention with reference to the presented embodiments. . The invention is not limited by the invention as such variations and modifications but only by the claims appended below.

11: inlet 12: flow path
13: exit 21: visor
31: tower 32: rotating blade
BP: Blade positions C1, C2, C3: Cycloidal surface
D1: inlet diameter D2: outlet diameter
FS1, FS2: Nonlinear Stream In: Inlet Strip
L1: Flow Space Length SL: Linear Slope

Claims (3)

In the wind power generator duct,
An inlet 11 through which wind is introduced;
An outlet 13 through which wind for rotating the blades is discharged; And
A flow path 12 having a surface of a cycloid structure connecting the inlet 11 and the outlet 13,
The cross-sectional area of the inlet (11) is smaller than the cross-sectional area of the outlet (13), the length of the flow path (12) is characterized in that the wind turbine duct, characterized in that it is equal to or smaller than the radius of the inlet cross-sectional area. The wind generator duct of claim 1, further comprising a visor (21) formed on the circumferential surface of the outlet (13). In a wind generator,
An induction duct in which the inflow cross section is smaller than the outlet cross section and the inner circumferential surface of the flow path is a cycloid structure; And
A rotary blade 32 disposed adjacent the outlet in the interior of the induction duct,
The inflow cross-section is circular, the length of the flow path is a wind generator duct, characterized in that the same or smaller than the radius of the inflow cross-sectional area.

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