Vertical vortex type wind mill

Abstract

To provide a vertical vortex type wind mill which controls flow behind a vertical vortex.SOLUTION: A vertical vortex type wind mill 1 includes: an intermediate object 2 having a first plane and a second plane which intersect a fluid flow direction substantially perpendicularly; a rotary shaft body 3 which is substantially parallel to the fluid flow direction; a first rotating body 4 which is disposed at the upstream side of the intermediate object 2 and rotates around the rotary shaft body 3 within a first rotary surface which intersects the fluid flow direction substantially perpendicularly; and a second rotating body 5 which is disposed at the downstream side of the intermediate object 2 and rotates around the rotary shaft body 3 within a second rotary surface which intersects the fluid flow direction substantially perpendicularly. The first rotating body 4 has a first intersection part 10 which is spaced apart from the intermediate object 2 toward the upstream side and intersects with the first plane. The second rotating body 5 has a second intersection part 11 which is spaced apart from the intermediate object 2 toward the downstream side and intersects the second plane. The first plane 6, the second plane 7, the first rotary surface 8, and the second rotary surface 9 are substantially parallel.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vertical vortex wind turbine that controls the flow behind a vertical vortex. [Background technology]

[0002] The inventors have proposed a power-generating rotating device that includes a rotating body and a wake object that has at least one intersection point that intersects with the rotating body at a distance downstream in the fluid flow direction, and that, based on the unprecedented new finding of the generation of steady lift by longitudinal vortices, utilizes the longitudinal vortices as a driving force, thereby enabling efficient power generation over a wide range of flow speeds without the longitudinal vortices disappearing even when the flow speed varies over a wide range (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. WO2016 / 111209 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the performance is improved by controlling the vortex generated between the cylinder and the ring among the longitudinal vortices that are generated and wrap around the plate, as shown in Fig. 1. In the present invention, the performance is improved by focusing on the vortex behind the ring. [Means for solving the problem]

[0005] In order to solve the above problem, the present invention provides a vertical vortex wind turbine comprising: an intermediate object having a first plane and a second plane that intersect approximately perpendicularly to a fluid flow direction; a rotating shaft that is approximately parallel to the fluid flow direction; a first rotating body arranged on the upstream side of the intermediate object and rotating around the rotating shaft in a first plane of rotation that intersects approximately perpendicularly to the fluid flow direction; and a second rotating body arranged on the downstream side of the intermediate object and rotating around the rotating shaft in a second plane of rotation that intersects approximately perpendicularly to the fluid flow direction, wherein the first rotating body has a first intersection portion that is spaced apart from the upstream side of the intermediate object and intersects with the first plane, and the second rotating body has a second intersection portion that is spaced apart from the downstream side of the intermediate object and intersects with the second plane, and the first plane, the second plane, the first plane of rotation, and the second plane of rotation are approximately parallel.

[0006] In the vertical vortex wind turbine, an angle of a second central axis in a longitudinal direction of the second rotor with respect to a first central axis in a longitudinal direction of the first rotor may be −15° to −45°, with the rotation direction being taken as a positive angle.

[0007] In the vertical vortex wind turbine, the first rotating body and the second rotating body may each include a thin-diameter support portion and a main body wing portion having a larger diameter than the support portion, and the main body wing portion may include the first intersection portion and the second intersection portion.

[0008] In the vertical vortex wind turbine, the main body blade portion may be a columnar body.

[0009] In the vertical vortex wind turbine, the intermediate object may be ring-shaped or cylindrical. Effect of the Invention

[0010] According to the vertical vortex type wind turbine of the present invention, the flow behind the vertical vortex can be controlled to further stabilize the flow of the vertical vortex and improve the performance of the wind turbine. In addition, by using double-sided blades, it can also handle winds from both the front and rear. [Brief description of the drawings]

[0011] [Figure 1] This is a contour diagram simulating the state of longitudinal vortices occurring between and behind a cylinder and a ring (plate). [Diagram 2] FIG. 1 is a front view of a vertical vortex wind turbine according to a preferred embodiment of the present invention. [Diagram 3] FIG. 1 is a side view of a vertical vortex wind turbine according to a preferred embodiment of the present invention. [Figure 4] FIG. 11 is a contour diagram showing a simulation result for visualizing pressure. [Diagram 5] FIG. 13 is a graph showing the results (torque) of a load experiment in which the angle θ was changed in the positive direction at a wind speed of 10 m / s. [Figure 6] FIG. 13 is a graph showing the results (torque) of a load experiment in which the angle θ was changed in the negative direction at a wind speed of 10 m / s. [Figure 7] FIG. 13 is a graph showing the results (rotation speed) of a load experiment in which the angle θ was changed at a wind speed of 10 m / s. [Figure 8] FIG. 13 is a graph showing the results (rotation speed) of a load experiment in which the angle θ was changed at a wind speed of 4 m / s. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following description, and various modifications and changes are possible for those skilled in the art based on the gist of the invention described in the claims or disclosed in the description for carrying out the invention. Such modifications and changes are also included in the scope of the present invention.

[0013] 2 and 3 show a schematic configuration of the vertical vortex wind turbine 1 of this embodiment. The vertical vortex wind turbine 1 includes an intermediate body 2, a rotating shaft body 3, a first rotating body 4, and a second rotating body 5.

[0014] The intermediate object 2 has a first plane 6 and a second plane 7 that intersect approximately perpendicularly to the flow direction F of the fluid. The intermediate object 2 can be, for example, a ring-shaped flat plate. In the drawings, the intermediate object 2 has a constant ring width w over the entire circumference. By setting the ring width w to an appropriate shape, it is possible to control the rotation direction and increase the rotational force of the first rotating body 4 and the second rotating body 5. Alternatively, the intermediate object 2 can be a thick cylindrical shape.

[0015] The rotating shaft 3 is approximately parallel to the direction of fluid flow. The intermediate object 2 is disposed so as to be concentric with the rotating shaft 3. By attaching a generator or the like to the rotating shaft 3, the vertical vortex wind turbine 1 can generate power.

[0016] The first rotor 4 is disposed on the upstream side of the intermediate object 2 and rotates around the rotor shaft 3 in a first rotation plane 8 that intersects the flow direction F of the fluid substantially perpendicularly. The first rotor 4 has a first intersection 10 that is spaced apart from the upstream side of the intermediate object 2 and intersects with the first plane 6. Although two first intersections 10 are provided in the drawing, the first rotor 4 can be rotated with one or more first intersections 10. The rotation of the first rotor 4 can be controlled by a first separation gap s1 between the first rotor 4 and the first plane 6. The first separation gap s1 may be made changeable according to wind speed and the like. By selecting the first separation gap s1 that is optimal for the flow speed conditions at the installation location, the lift can be easily controlled and efficient power generation can be performed. Note that a plurality of first rotors 4 can be provided.

[0017] The second rotor 5 is disposed downstream of the intermediate object 2 and rotates around the rotor shaft 3 in a second rotation plane 9 that intersects the flow direction F of the fluid substantially perpendicularly. The second rotor 5 has a second intersecting portion 11 that is spaced apart from the intermediate object 2 downstream and intersects with the second plane 7. Although two second intersecting portions 11 are provided in the drawing, the second rotor 5 can be rotated with one or more second intersecting portions 11. The rotation of the second rotor 5 can be controlled by a second separation gap s2 between the second rotor 5 and the second plane 7. The second separation gap s2 may be changeable according to wind speed, etc. By selecting the second separation gap s2 that is optimal for the flow speed conditions at the installation location, the lift can be easily controlled and efficient power generation can be performed. The second separation gap s2 may be the same as the first separation gap s1 or may be different. Note that a plurality of second rotors 5 can be provided.

[0018] The first plane 6, the second plane 7, the first plane of rotation 8, and the second plane of rotation 9 are substantially parallel to each other.

[0019] FIG. 4 is a contour diagram showing the results of a simulation for visualizing pressure.

[0020] In conventional vertical vortex wind turbines, the generation of vertical vortices creates a negative pressure area above the rotor, generating lift.

[0021] In the vertical vortex wind turbine 1 of this embodiment, a negative pressure region is confirmed above the second rotor 5 in the result of cross section B. This causes lift to be generated not only in the first rotor 4 but also in the second rotor 5, increasing the lift of the entire system.

[0022] It is preferable that the angle θ between the first rotating body 4 and the second rotating body 5 is fixed. The angle θ is the angle of the second central axis P2 in the longitudinal direction of the second rotating body 5 relative to the first central axis P1 in the longitudinal direction of the first rotating body 4. The angle θ is positive in the rotation direction. In other words, when the rotation direction is counterclockwise, the position of the second rotating body 5 in FIG. 2 is a position where the angle θ is positive.

[0023] The first rotor 4 and the second rotor 5 each include a thin-diameter support 12 and a body wing 13 having a diameter larger than that of the support 12, and the body wing 13 includes a first intersection 10 and a second intersection 11. The body wing 13 may be, for example, a columnar body. The cross section of the columnar body is preferably circular, but may be polygonal such as a square, or may be non-circular such as an ellipse. The support 12 only needs to have the strength to support the body wing 13, and the diameter of the support 12 may be uniform in the longitudinal direction, or may vary continuously or discontinuously.

[0024] In addition, the first rotor 4 and the second rotor 5 may be shaped like a wing, such as a propeller blade. Only the main blade portion 13 may be shaped like a wing, such as a propeller blade. By using a wing shape, the lift can be increased more efficiently.

[0025] The first rotor 4 and the second rotor 5 can be made to be usable in high temperature environments by making them from ceramics, etc. Furthermore, by making the first rotor 4 and the second rotor 5 from foamed plastic such as polystyrene foam or urethane foam, a lightweight and safe vertical vortex wind turbine 1 can be provided.

[0026] 5 to 7 show the results of a load experiment in which the angle θ was changed and the electric torque value was used as a parameter at a constant wind speed (10 m / s). The load experiment is a test to measure the torque and rotation speed of the wind turbine, i.e., the performance of the wind turbine. In this embodiment, it is clarified what angle θ of the second rotor 5 with respect to the first rotor 4 is required to control the wake of the longitudinal vortex and generate lift.

[0027] The vertical vortex wind turbine 1 used in the load experiment had the following dimensions, as shown in FIG. 2: d=20 mm, D=155 mm, l / d=3.0, and w / d=1.0.

[0028] When the angle θ was positive, there was no interference with the wake of the longitudinal vortex, and no significant improvement in performance was observed. On the other hand, when the angle θ was negative, lift was also generated by the second rotor 5, and performance improved. From the experimental results, it was found that the angle θ is preferably between -15° and -45°. In particular, the maximum efficiency was obtained when the angle θ was between -25° and -30°.

[0029] The results of the load experiment when the wind speed was 4 m / s are shown in Figure 8. The same tendency as when the wind speed was 10 m / s was observed, and the maximum rotation speed was obtained when the angle θ was -30°.

[0030] As described above in detail, the vertical vortex wind turbine 1 of this embodiment includes the intermediate object 2 having the first plane 6 and the second plane 7 that intersect approximately perpendicularly to the fluid flow direction F, the rotating shaft 3 that is approximately parallel to the fluid flow direction F, the first rotating body 4 that is arranged on the upstream side of the intermediate object 2 and rotates around the rotating shaft 3 within the first rotation plane 8 that intersects approximately perpendicularly to the fluid flow direction F, and the second rotating body 5 that is arranged on the downstream side of the intermediate object 2 and rotates around the rotating shaft 3 within the second rotation plane 9 that intersects approximately perpendicularly to the fluid flow direction F. The first rotating body 4 has a first intersection portion 10 that is spaced apart from the upstream side of the intermediate object 2 and intersects with the first plane 6, and the second rotating body 5 has a second intersection portion 11 that is spaced apart from the downstream side of the intermediate object 2 and intersects with the second plane 7, and the first plane 6, the second plane 7, the first rotation plane 8, and the second rotation plane 9 are approximately parallel to each other.

[0031] With this configuration, the first rotor 4 and the second rotor 5 can be rotated efficiently under a wide range of flow speeds using the vertical vortex as a driving force. In addition, by using double-sided blades, it can also handle winds coming from both the front and rear.

[0032] In the vertical vortex wind turbine 1 of this embodiment, the angle of the second central axis P2 in the longitudinal direction of the second rotor 5 relative to the first central axis P1 in the longitudinal direction of the first rotor 4 is -15° to -45°, with the rotation direction being positive.

[0033] With this configuration, the second rotor also generates lift, improving the performance of the wind turbine, such as torque and rotation speed.

[0034] In addition, in the vertical vortex wind turbine 1 of this embodiment, the first rotating body 4 and the second rotating body 5 each have a thin diameter support portion 12 and a main body blade portion 13 having a larger diameter than the support portion 12, and the main body blade portion 13 includes a first intersection portion 10 and a second intersection portion 11.

[0035] With this configuration, it becomes easier to increase the numbers of first rotors 4 and second rotors 5 without having to worry about air resistance, making it possible to achieve higher output.

[0036] In the vertical vortex wind turbine 1 of this embodiment, the main body blade portion 13 is a columnar body.

[0037] With this configuration, the first rotating body 4 and the second rotating body 6 can be made into a strong and robust airfoil shape.

[0038] In the vertical vortex wind turbine 1 of this embodiment, the intermediate body 2 is ring-shaped or cylindrical.

[0039] With this configuration, a simple and easily processed configuration can be realized. [Explanation of symbols]

[0040] 1 Vertical vortex wind turbine 2 intermediate object 3 Rotating shaft 4 First Rotating Body 5 Second rotating body 6 1st plane 7 Second plane 8 First surface of revolution 9 Second surface of revolution 10 First Intersection 11 Second Intersection 12 Support section 13 Main body wing F Fluid flow direction P1 1st central axis P2 2nd central axis

Claims

1. an intermediate object having a first plane and a second plane intersecting substantially perpendicularly to a flow direction of the fluid; A rotating shaft body that is approximately parallel to the flow direction of the fluid; a first rotor that is disposed upstream of the intermediate object and rotates about the rotating shaft within a first rotation plane that intersects the fluid flow direction substantially perpendicularly; a second rotating body that is disposed downstream of the intermediate object and rotates about the rotating shaft body within a second rotation plane that intersects the fluid flow direction substantially perpendicularly, the first rotating body has a first intersecting portion that is spaced apart from the intermediate object on the upstream side and intersects with the first plane, the second rotating body has a second intersecting portion that is spaced apart from the intermediate object on a downstream side of the intermediate object and intersects with the second plane; The first plane, the second plane, the first plane of rotation, and the second plane of rotation are substantially parallel to each other.

2. 2. The wind turbine according to claim 1, wherein an angle of the second central axis of the second rotor relative to the first central axis of the first rotor is −15° to −45°, with the rotation direction being positive.

3. The vertical vortex wind turbine according to claim 1, wherein the first rotor and the second rotor each include a thin-diameter support portion and a main body blade portion having a diameter larger than that of the support portion, and the main body blade portion includes the first intersection portion and the second intersection portion.

4. The vertical vortex wind turbine according to claim 3, wherein the main body blade portion is a columnar body.

5. The vertical vortex wind turbine according to claim 1, wherein the intermediate object is ring-shaped or cylindrical.

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