A power generation device based on vortex-induced effect of improved cross-section cylinder

Abstract

The present invention relates to a power generation device based on the vortex-induced effect of an improved cross-section cylinder, comprising a bracket, an energy capture member and a power generation module, the two ends of the energy capture member are rotationally connected to the bracket through a rotating assembly, and the output end is connected to the power generation module, the energy capture member is a rigid cylinder, the radial cross section of the energy capture member includes N straight line units, the two ends of each straight line unit are extended and intersected with the extension line of the adjacent straight line unit to obtain a polygon, and the endpoints of the adjacent straight line units are connected by a curve segment. Compared with the prior art, the present invention has the advantages of high energy absorption rate.

Description

Technical Field

[0001] The invention relates to the field of vortex-induced electricity generation, in particular to a power generation device based on the vortex-induced effect of an improved cross-section column. Background Art

[0002] The wind, river currents, tides and ocean currents in nature all carry huge amounts of energy, mainly the kinetic energy of fluid flow. Making full use of this energy will generate a large amount of electricity for humans. Therefore, scientists have proposed a technology to use fluid kinetic energy to generate electricity. However, the existing devices that use fluid kinetic energy to generate electricity have a relatively complex structure and cannot absorb fluid kinetic energy in all directions, resulting in low energy capture efficiency.

[0003] When a fluid flows through a rigid body, the vortex behind the object falls off, generating a pulsating load on the object, causing the rigid body to move. This is called the vortex-induced effect. At the same time, the movement of the rigid body acts on the fluid, changing the wake state. In this process, the kinetic energy of the fluid is collected and converted into the kinetic energy of the object. The vortex-induced effect power generation technology makes full use of the vortex-induced effect to convert the kinetic energy of the fluid into mechanical kinetic energy, and then uses the mechanical kinetic energy to generate electricity through a power generation device. Compared with other forms of vortex-induced vibration, it is more reliable to generate electricity by rotating the energy capture device around the axis, and the conversion method is more natural.

[0004] At present, power generation devices using the vortex-induced effect generally use cylinders with circular, elliptical or polygonal cross-sections. Due to the vortex-induced effect, the cylinder that can rotate around the axis will undergo several states such as periodic swing, random swing and unidirectional rotation under the action of fluids with different flow rates. Among them, unidirectional rotation is a more ideal motion state that is conducive to stable and continuous power generation. However, from the perspective of practical application, for rotational motion under the vortex-induced effect, cylinders with rounded cross-sections such as circles and ellipses are not easy to produce vortex-induced effects, and cylinders with sharp-angled polygonal cross-sections such as triangles and quadrilaterals are more prone to vortex-induced vibrations. However, due to the flow resistance of regular cross-sectional shapes such as triangles and quadrilaterals in the reverse direction of rotation, random swings are more common, and unidirectional rotation will only occur when the flow rate is large enough. Therefore, there is still room for improvement in the capture of fluid energy by traditional cross-sectional columns, power generation is not continuous and stable enough, and power generation efficiency is low. Summary of the invention

[0005] The purpose of the present invention is to provide a power generation device based on the vortex-induced effect of an improved cross-section column. Through the dispersion of fluid impulse by curves, the radial cross-section is divided into a windward side and a leeward side. The design of the improved cross-section responds more obviously to the vortex-induced effect than the rounded cross-section. Compared with conventional polygons, the curved edges can reduce the flow resistance in the reverse rotation direction, making the column easier to rotate in one direction and making the power output more stable and continuous, so that the kinetic energy of the incoming flow in all directions can be collected, the energy absorption rate is high, and the device operation efficiency is high.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A power generation device based on the vortex-induced effect of an improved cross-section cylinder comprises a bracket, an energy capture component and a power generation module, wherein both ends of the energy capture component are rotationally connected to the bracket via a rotating assembly, and the output end is connected to the power generation module, the energy capture component is a rigid cylinder, and the radial cross-section of the energy capture component comprises N straight line units, both ends of each straight line unit are extended and intersect with the extension lines of adjacent straight line units to obtain a polygon, and the endpoints of adjacent straight line units are connected by a curve segment.

[0008] The straight line unit is one or two line segments, and when there are two line segments, the two line segments are connected end to end to form an inner angle, and the inner angle is an inner concave angle of the polygon.

[0009] All straight line elements are one line segment.

[0010] The radial cross section is a rotationally symmetrical figure, and the minimum rotationally symmetrical angle is 360° / N.

[0011] The polygon is an axisymmetric figure.

[0012] The curve segment is a part of a circle, an ellipse, a parabola or a hyperbola.

[0013] The energy capture component is a cylinder with a uniform cross-section.

[0014] The energy capture component is a cylinder with non-uniform cross-section.

[0015] The axis of the energy capture member is arranged vertically.

[0016] There are a plurality of energy capture components, and the output ends of the energy capture components are coupled to each other and connected to the power generation module.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The radial section is divided into the windward side and the leeward side by the curve to disperse the fluid impulse. The improved section design is more responsive to the vortex-induced effect than the rounded section. Compared with the conventional polygon, the curved side can reduce the flow resistance in the reverse rotation direction, making it easier for the column to rotate in one direction, making the power output more stable and continuous, so that the kinetic energy of the incoming flow in all directions can be collected, with high energy absorption rate and high device operation efficiency.

[0019] 2) All straight line units are line segments, and the basic design of convex polygons is adopted to further improve the utilization rate.

[0020] 3) Symmetrical design, easy to prepare, install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the power generation device of the present invention;

[0022] Figure 2 A schematic diagram of a cross-sectional design in an embodiment of the present invention;

[0023] Figure 3 This is another schematic diagram of cross-sectional design in an embodiment of the present invention;

[0024] Figure 4 This is another schematic diagram of a cross-sectional design in an embodiment of the present invention;

[0025] Among them: 1. bracket, 2. energy capture component, 3. power generation module, 4. straight line segment, 5. curved segment, 401. extension line of the straight line segment. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0027] A power generation device based on the vortex-induced effect of a modified cross-section cylinder, such as Figure 1 As shown, it includes a bracket 1, an energy capture component 2 and a power generation module 3. The two ends of the energy capture component 2 are rotatably connected to the bracket 1 through a rotating assembly, and the output end is connected to the power generation module 3. The energy capture component 2 is a rigid column. The two ends of the energy capture component 2 are rotatably matched with the bracket 1, and the two are connected by a bearing, so that the energy capture component 2 has a single degree of freedom to rotate around the axis. The bracket 1 plays the role of fixing the rotating shaft of the energy capture component 2.

[0028] When the fluid flows through the energy capture device 2, due to the vortex effect, the energy capture device 2 will oscillate or rotate in one direction, and the movement of the energy capture device 2 drives the power generation module 3 connected to the energy capture device 2 to generate electricity. In order to achieve the purpose of the above-mentioned unidirectional rotation, the radial cross-section of the energy capture device 2 includes N straight line units, and the two ends of each straight line unit are extended to intersect with the extension line of the adjacent straight line unit to obtain a polygon, and the endpoints of the adjacent straight line units are connected by a curve segment, which is an outward convex curve.

[0029] By dispersing the fluid impulse through the curve, the radial section is divided into the windward side and the leeward side. The design of the improved section is more responsive to the vortex-induced effect than the rounded section. Compared with the conventional polygon, the curved edge can reduce the flow resistance in the reverse rotation direction, making it easier for the column to rotate in one direction, making the power output more stable and continuous, so that the kinetic energy of the incoming flow in all directions can be collected, with a high energy absorption rate and high device operation efficiency.

[0030] The structure of the power generation module 3 is a prior art, and its selection, installation and use have been mastered by ordinary technicians in the same field, so it will not be introduced here.

[0031] Among them, the straight line unit is one or two line segments, and when there are two line segments, the two line segments are connected end to end to form an inner angle, and the inner angle is an inner concave angle of the polygon. Specifically, all of them can be one line segment, or all of them can be two line segments, or some can be one line segment and some can be two line segments. Preferably, all straight line units are one line segment, so that the polygon obtained by the above extension and intersection is a convex polygon, which further improves the utilization rate.

[0032] In some embodiments, the radial cross section is a rotationally symmetric figure, and the minimum rotationally symmetric angle is 360° / N.

[0033] In some embodiments, the polygon is an axisymmetric figure, and may be eccentric or non-eccentric.

[0034] A curve segment is part of a circle, ellipse, parabola, hyperbola, or other type of curve

[0035] In some embodiments, the energy capture element 2 is a cylinder with a uniform cross-section, and in other embodiments, the energy capture element 2 is a cylinder with a non-uniform cross-section, that is, the area and shape of each radial interface along the axial direction will change, specifically, the side length of the line segment may change.

[0036] In some embodiments, the axis of the energy capturing member 2 is arranged vertically.

[0037] In some embodiments, a plurality of energy capture components 2 are provided, and the output ends of the energy capture components 2 are coupled to each other and connected to the power generation module 3 .

[0038] The size, height, etc. of the energy capture element 2 can be determined according to the fluid conditions at the location of the device.

[0039] Embodiment 1:

[0040] like Figure 2As shown, the improved radial cross-section can be obtained based on a triangle. First, the two sides of each vertex are defined as the windward side and the leeward side. The windward side is the side behind the vertex along the rotation direction, and the leeward side is the side in front of the vertex along the rotation direction.

[0041] Starting from a point on the leeward side pointing to the sharp corner, extend along the curve toward the inside of the triangle until it intersects with the windward side, and take the angle where the curve intersects with the windward side as the new sharp corner. At this time, the windward side of the sharp corner is still the straight line segment 4, and the leeward side is the curved segment 5. The extended lines 401 of the straight line segments intersect and form a triangle together with the straight line segments, which can effectively prevent the flow resistance in the reverse rotation direction and make the column with the improved cross-section easier to rotate in one direction.

[0042] Embodiment 2:

[0043] like Figure 3 As shown, the improved radial cross section can be obtained based on a quadrilateral. First, the two sides of each vertex are defined as the windward side and the leeward side. The windward side is the side behind the vertex along the rotation direction, and the leeward side is the side in front of the vertex along the rotation direction.

[0044] Starting from a point on the leeward side pointing to the direction of the sharp corner, extend along the curve inside the quadrilateral until it intersects with the windward side, and take the angle where the curve intersects the windward side as the new sharp corner. At this time, the windward side of the sharp corner is still a straight line segment, and the leeward side is a curved segment. The extension lines of the straight line segments intersect and form a quadrilateral together with the straight line segments, which can effectively prevent the flow resistance in the reverse rotation direction and make the column with improved cross-section easier to rotate in one direction.

[0045] Embodiment 3:

[0046] The radial interface can be obtained by processing concave polygons, such as four-pointed stars and five-pointed stars, such as Figure 4 As shown, the cross-sectional shape is based on a five-pointed star. For a concave polygon, only the outer convex corners thereof are curved.

Claims

1. A power generation device based on the vortex-induced effect of a modified cross-section column, comprising a bracket (1), an energy capture component (2) and a power generation module (3), wherein both ends of the energy capture component (2) are rotatably connected to the bracket (1) via a rotating assembly, and the output end is connected to the power generation module (3), and the energy capture component (2) is a rigid column, characterized in that: The radial cross section of the energy capture element (2) comprises N straight line units, the two ends of each straight line unit are extended and intersect with the extension line of the adjacent straight line unit to obtain a polygon, and the endpoints of the adjacent straight line units are connected by a curve segment; The straight line unit is one or two line segments, and when there are two line segments, the two line segments are connected end to end to form an inner angle, and the inner angle is an inner concave angle of the polygon; The radial cross section is a rotationally symmetrical figure, and the minimum rotationally symmetrical angle is 360° / N.

2. A power generation device based on vortex-induced effect of improved cross-section cylinder according to claim 1, characterized in that: All straight line elements are one line segment.

3. A power generation device based on vortex-induced effect of improved cross-section cylinder according to claim 1, characterized in that: The polygon is an axisymmetric figure.

4. A power generation device based on vortex-induced effect of improved cross-section cylinder according to claim 1, characterized in that: The curve segment is a part of a circle, an ellipse, a parabola or a hyperbola.

5. The power generation device based on the vortex-induced effect of the improved cross-section cylinder according to claim 1, characterized in that: The energy capture element (2) is a cylinder with a uniform cross-section.

6. A power generation device based on vortex-induced effect of improved cross-section cylinder according to claim 1, characterized in that: The energy capture element (2) is a cylinder with a non-uniform cross-section.

7. A power generation device based on vortex-induced effect of improved cross-section cylinder according to claim 1, characterized in that: The axis of the energy capture element (2) is arranged vertically.

8. The power generation device based on the vortex-induced effect of the improved cross-section cylinder according to claim 1, characterized in that: A plurality of energy capture components (2) are provided, and the output ends of the energy capture components (2) are coupled to each other and connected to the power generation module (3).

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