Vortex windmill

Abstract

We aim to further improve wind turbine performance by improving conventional vertical vortex wind turbines. [Solution] The vertical vortex wind turbine 1 comprises a first wake body 2 having a first plane 6 that intersects substantially perpendicularly with the fluid flow direction F, a rotating shaft 3 substantially parallel to the fluid flow direction F, a first rotating body 4 positioned upstream of the first wake body 2 and rotating around the rotating shaft 3 in a first rotation plane 8 that intersects substantially perpendicularly with the fluid flow direction F, and a second wake body 5 positioned upstream of the first rotating body 4 and having a second plane 7 that intersects substantially perpendicularly with the fluid flow direction F, wherein the first rotating body 4 has a first intersection portion 10 that intersects the first plane 6 at a distance upstream of the first wake body 2, and the first plane 6, the first rotation plane 8, and the second plane 7 are substantially parallel.

Description

[Technical Field]

[0001] This invention relates to a vertical vortex wind turbine that aims to further improve wind turbine performance by improving upon conventional vertical vortex wind turbines. [Background technology]

[0002] The present inventors have proposed a rotating power generation device comprising a rotating body and a wake body having at least one intersection point that intersects the rotating body at a distance downstream in the direction of fluid flow, and based on the completely unprecedented new finding of generating steady-state lift due to longitudinal vortices, the device utilizes longitudinal vortices as a driving force, so that the longitudinal vortices do not disappear even when the flow velocity fluctuates over a wide range, and power generation can be efficiently generated under a wide range of flow velocities (for example, Patent Document 1).

[0003] Furthermore, in Japanese Patent Application No. 2023-160061 filed by the present applicant, a vertical vortex wind turbine is proposed that controls the flow behind the vertical vortex to further stabilize the flow of the vertical vortex, improves wind turbine performance, and, by using double-sided blades, can respond to winds from both the front and the rear. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. WO2016 / 111209 [Overview of the project] [Problems that the invention aims to solve]

[0005] Patent Document 1 aimed to improve performance by controlling the vortex generated between the cylinder and the ring in the vertical vortex that wraps around the plate. The present invention aims to further improve wind turbine performance by improving the conventional vertical vortex wind turbine. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides a vertical vortex wind turbine comprising: a first wake body having a first plane that intersects substantially perpendicularly with respect to the direction of fluid flow; a rotating shaft body substantially parallel to the direction of fluid flow; a first rotating body supported by the rotating shaft body and positioned upstream of the first wake body, and rotating about the rotating shaft body in a first rotation plane that intersects substantially perpendicularly with respect to the direction of fluid flow; and a second wake body positioned upstream of the first rotating body and having a second plane that intersects substantially perpendicularly with respect to the direction of fluid flow, wherein the first rotating body has a first intersection portion that intersects the first plane at a distance upstream of the first wake body, and the first plane, the first rotation plane, and the second plane are substantially parallel.

[0007] In the aforementioned vertical vortex wind turbine, the first rotating body may have a second intersection portion that intersects with the back surface of the second plane at a distance downstream of the second wake body, and the first rotating plane and the back surface of the second plane may be substantially parallel.

[0008] The vertical vortex wind turbine may further include a second rotating body that is pivotally supported by the rotating shaft and positioned upstream of the second wake object, and rotates about the rotating shaft in a second rotational plane that intersects substantially perpendicular to the direction of fluid flow, wherein the second rotating body has a third intersection portion that intersects the second plane at a distance upstream of the second wake object, and the second plane and the second rotational plane are substantially parallel.

[0009] In the aforementioned vertical vortex wind turbine, the first and second wake bodies may be ring-shaped or cylindrical, and the outer diameter of the second wake body may be larger than the outer diameter of the first wake body.

[0010] In the aforementioned vertical vortex wind turbine, in addition to the first wake body, the first rotating body, the second wake body, and the second rotating body, a wake body and a rotating body may be further provided. [Effects of the Invention]

[0011] According to the vertical vortex type windmill of the present invention, by improving the conventional vertical vortex type windmill, further improvement of the windmill performance can be achieved.

Brief Description of the Drawings

[0012] [Figure 1] It is a front view of the vertical vortex type windmill of a preferred embodiment of the present invention. [Figure 2] It is a side view of the vertical vortex type windmill of a preferred embodiment of the present invention. [Figure 3] It is a T-n curve when the outer diameter D’out of the second wake body is 230 mm. [Figure 4] It is a T-n curve when the outer diameter D’out of the second wake body is 240 mm. [Figure 5] It is a T-n curve when the outer diameter D’out of the second wake body is 250 mm. [Figure 6] It is a T-n curve when the outer diameter D’out of the second wake body is 260 mm. [Figure 7] It is a Cp-λ curve when the outer diameter D’out of the second wake body is 230 mm. [Figure 8] It is a Cp-λ curve when the outer diameter D’out of the second wake body is 240 mm. [Figure 9] ​​​​​​​​​​​​​​​​​​This is a front view of a longitudinal vortex wind turbine with eight blades in the first rotating body. [Figure 16] This is the Tn curve for an 8-bladed longitudinal vortex wind turbine when the outer diameter D'out of the second wake body is 260 mm. [Figure 17] This is the Cp-λ curve for an 8-bladed longitudinal vortex wind turbine when the outer diameter D'out of the second wake body is 260 mm. [Figure 18] This graph shows the maximum torque Tmax of an 8-bladed longitudinal vortex wind turbine when the outer diameter D'out of the second wake body is 260 mm. [Figure 19] This graph shows the maximum power coefficient Cpmax when the outer diameter D'out of the second wake body of an 8-bladed longitudinal vortex wind turbine is 260 mm. [Figure 20] This is a perspective view of a longitudinal vortex wind turbine with four wake bodies and four rotating bodies. [Figure 21] This is a top cross-sectional view of a longitudinal vortex wind turbine with four wake bodies and four rotating bodies. [Modes for carrying out the invention]

[0013] Examples based on preferred embodiments of the present invention will be described below 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 as described in the claims or disclosed in the forms for carrying out the invention. Such modifications and changes are also included within the scope of the present invention. Furthermore, all documents referenced herein are incorporated herein by reference in their entirety. [Examples]

[0014] Figures 1 and 2 show a schematic configuration of a vertical vortex wind turbine of Example 1 based on a preferred embodiment of the present invention. The vertical vortex wind turbine of the present invention is an improvement on the vertical vortex wind turbine described in Patent Document 1, with further improvements in wind turbine performance. Therefore, all the configurations described in Patent Document 1 are applicable to the vertical vortex wind turbine of the present invention. In Figures 1 and 2, 1 is a vertical vortex wind turbine, and the vertical vortex wind turbine 1 comprises a ring-shaped first wake body 2, a cylindrical first rotating body 4 pivotally supported on a rotating shaft 3 and positioned upstream of the first wake body 2, and a ring-shaped second wake body 5 positioned upstream of the first rotating body 4.

[0015] The first wake object 2 has a first plane 6 that intersects substantially perpendicularly with the fluid flow direction F, and the second wake object 5 has a second plane 7 that intersects substantially perpendicularly with the fluid flow direction F. The first wake object 2 and the second wake object 5 are formed from ring-shaped flat plates. In this embodiment shown in the drawings, the first wake object 2 has a constant ring width W around its entire circumference. The second wake object 5 has a constant ring width W' around its entire circumference. On the other hand, the ring widths W and W' of the first wake object 2 and the second wake object 5 may vary in the circumferential direction, or they may be formed intermittently rather than continuously in the circumferential direction. By setting the ring widths W and W' to appropriate values, varying the ring widths W and W' in the circumferential direction, or forming them intermittently in the circumferential direction, the rotational force of the first rotating body 4 can be increased, or the direction of rotation can be controlled to automatically start rotating in one direction. Alternatively, the first wake object 2 and the second wake object 5 can be cylindrical in shape with a greater thickness in a direction parallel to the fluid flow direction F, rather than being ring-shaped flat plates.

[0016] The rotating shaft 3 is approximately parallel to the fluid flow direction F. The first wake object 2 and the second wake object 5 are arranged concentrically with the rotating shaft 3. By attaching a generator or the like to the rotating shaft 3, power generation by the vertical vortex wind turbine 1 becomes possible.

[0017] The first rotating body 4 is pivotally supported by the rotating shaft 3 and positioned upstream of the first wake object 2, and rotates around the rotating shaft 3 in a first rotation plane 8 that intersects substantially perpendicularly with the fluid flow direction F. The first rotating body 4 has a first intersection 10 that intersects the first plane 6 at a distance upstream of the first wake object 2. The first rotating body 4 also has a second intersection 12 that intersects the back surface 11 of the second plane 7 at a distance downstream of the second wake object 5. Having the second intersection 12 allows for improved wind turbine performance by utilizing the flow behind the second wake object 5. In this embodiment, two first intersections 10 and two second intersections 12 are provided, but the first rotating body 4 can be rotated with one or more. Note that multiple first rotating bodies 4 can be provided.

[0018] The first plane 6, the second plane 7, the first plane of revolution 8, and the back surface 11 of the second plane 7 are approximately parallel.

[0019] The rotation of the first rotating body 4 can be controlled by appropriately changing the first clearance gap s between the first rotating body 4 and the first plane 6, and the second clearance gap s' between the first rotating body 4 and the back surface 11 of the second plane 7. The first clearance gap s and the second clearance gap s' may be made adjustable according to wind speed, etc. By selecting the first clearance gap s and the second clearance gap s' that are optimal for the flow velocity conditions at the installation site, the lift force can be easily controlled, and if a generator or the like is attached to the rotating shaft 3, efficient power generation can be achieved.

[0020] In Figures 1 and 2, the outer diameter D' of the second downstream object 5 is shown. out The outer diameter D of the first downstream object 2 is out It is smaller than that. On the other hand, as shown below, the outer diameter D' of the second wake object 5 out However, the outer diameter D of the first downstream object 2 out A larger size would allow for further improvements in wind turbine performance.

[0021] Figures 3 to 6 show the experimental results of the relationship between torque T and rotational speed n (Tn curve). Outer diameter D of the first wake object 2. out The outer diameter D' of the second wake object 5 is set to 175 mm. outThey were set to 230 mm (Figure 3), 240 mm (Figure 4), 250 mm (Figure 5), and 260 mm (Figure 6). Also, in Figures 7 to 10, the outer diameter D’ of the same second trailing body 5 out of the power coefficient C p and the relationship with the peripheral speed ratio λ (C p -λ curve) of the experimental results are shown. Each dimension shown in Figures 1 and 2 was such that the length l of the first rotating body 4 was 215 mm, the ring width W of the first trailing body 2 was 20 mm, the diameter D of the first trailing body 2 was 155 mm, the first separation gap s was 7 mm, and the second separation gap s’ was 28 mm. The wind speed was 10 m / s. The larger the outer diameter D’ out of the second trailing body 5, the larger the torque T and the power coefficient C p became, and the performance of the windmill was improved.

[0022] In Figures 11 and 12, the outer diameter D out of the first trailing body 2 was 175 mm, and the outer diameter D’ out of the second trailing body 5 was 260 mm, showing the maximum torque T max and the maximum power coefficient C pmax . The dotted line values are those of the conventional vertical vortex type windmill without the second trailing body 5. The maximum torque T max was up to 1.34 times that of the conventional vertical vortex type windmill without the second trailing body 5, and the maximum power coefficient C pmax was up to 4.54 times.

[0023] <00D0166> Figure 13 is a contour diagram showing the simulation results for visualizing the flow between the rings when the outer diameter D’ out of the second trailing body 5 is 260 mm. The inner diameter D’in of the second trailing body 5 was 220 mm, the ring width W’ of the second trailing body 5 was 20 mm, and the second separation gap s’ was 28 mm. It was found that the wind speed near the first trailing body 2 and the second trailing body 5 was improved.

[0024] Hereinafter, Examples 2 to 4 based on the configuration of Example 1 will be described. Note that the material and shape of the rotating body described in the following examples are applicable to all examples including Example 1.

Example

[0025] As shown in Figure 14, the system may further include a second rotating body 13 positioned upstream of the second wake object 5, which rotates around a rotating shaft 3 in a second rotational plane 9 that intersects substantially perpendicularly with the fluid flow direction F. The second rotating body 13 has a third intersection 14 that intersects the second plane 7 at a distance upstream of the second wake object 5, and the second plane 7 and the second rotational plane 9 are substantially parallel. Although two third intersections 14 are shown in the drawing, one or more are sufficient to rotate the second rotating body 13. Multiple second rotating bodies 13 can be provided.

[0026] The first rotating body 4 and the second rotating body 13 can be made from materials such as ceramic to enable use in high-temperature environments. Furthermore, by making the first rotating body 4 and the second rotating body 13 from foamed plastic such as polystyrene foam or foamed urethane, a lightweight and safe vertical vortex wind turbine 1 can be provided. [Examples]

[0027] Figure 15 shows a front view of the first rotating body 4 when it has eight blades. The first rotating body 4 comprises a small-diameter support section 15 and a main wing section 16 which has a larger diameter than the support section 15, and the main wing section 16 intersects with the first wake object 2. In this embodiment, the main wing section 16 does not intersect with the second wake object 5, but it may be configured to intersect with the second wake object 5. The main wing section 16 is a columnar body such as a cylindrical shape. The cross-section of the columnar body is preferably circular, but it may be a polygon such as a quadrilateral, or a non-circular shape such as an ellipse. The support section 15 only needs to have enough strength to support the main wing section 16, and the diameter of the support section 15 may be uniform in the longitudinal direction, or it may change continuously or discontinuously.

[0028] In addition, the first rotating body 4 and the second rotating body 13 may have an airfoil shape, such as a propeller blade, or a general blade blade. The main wing section 16 may also have an airfoil shape, such as a propeller blade, or a general blade blade. By using an airfoil shape, the rotational force of the first rotating body 4 and the second rotating body 13 due to the fluid flow can be increased.

[0029] Figures 16 and 17 show the outer diameter D of the first downstream object 2. out The diameter is 175 mm, and the outer diameter D' of the second wake object 5. out Tn curve and C when 260mm p This is a -λ curve. Compared to a conventional vertical vortex wind turbine (●) without a second wake body 5, the torque T and power coefficient C are different. p The diameter has increased, improving the wind turbine performance. Figures 18 and 19 show the outer diameter D of the first wake object 2. out The diameter is 175 mm, and the outer diameter D' of the second wake object 5. out Maximum torque T when 260mm max and maximum power coefficient C pmax This shows the values ​​of a conventional vertical vortex wind turbine without the second wake object 5. Maximum torque T max Compared to conventional vertical vortex wind turbines that do not have a second wake object 5, this design offers up to 1.89 times the power output and a maximum power coefficient C. pmax The maximum increase was 4.01 times. [Examples]

[0030] In addition to the vertical vortex wind turbine 1 consisting of the first wake body 2, the second wake body 5, the first rotating body 4, and the second rotating body 13 shown in Figure 14, further wake bodies and rotating bodies may be provided. Figures 20 and 21 show schematic diagrams of cases where four wake bodies 17 and four rotating bodies 18 are provided. There may be three wake bodies 17 and five or more rotating bodies 18, respectively. The configuration of the third and subsequent bodies is the same as the configuration of the first and second bodies.

[0031] As described in detail above, the vertical vortex wind turbine 1 of this embodiment comprises a first wake body 2 having a first plane 6 that intersects substantially perpendicularly with respect to the fluid flow direction F, a rotating shaft 3 substantially parallel to the fluid flow direction F, a first rotating body 4 that is pivotally supported by the rotating shaft 3 and positioned upstream of the first wake body 2, and rotates around the rotating shaft 3 in a first rotation plane 8 that intersects substantially perpendicularly with respect to the fluid flow direction F, and a second wake body 5 positioned upstream of the first rotating body 4 and having a second plane 7 that intersects substantially perpendicularly with respect to the fluid flow direction F. The first rotating body 4 has a first intersection portion 10 that intersects with the first plane 6 at a distance upstream of the first wake body 2, and the first plane 6, the first rotation plane 8, and the second plane 7 are substantially parallel.

[0032] Furthermore, in the vertical vortex wind turbine 1 of this embodiment, the first rotating body 4 has a second intersection portion 12 that intersects with the back surface 11 of the second plane 7, separated from the downstream side of the second wake body 5, and the first rotating surface 8 and the back surface 11 of the second plane 7 are substantially parallel.

[0033] Furthermore, the vertical vortex wind turbine 1 of this embodiment further includes a second rotating body 13 that is pivotally supported by the rotating shaft 3 and positioned upstream of the second wake object 5, and rotates about the rotating shaft 3 in a second rotational plane 9 that intersects substantially perpendicularly with the fluid flow direction F. The second rotating body 13 has a third intersection portion 14 that intersects with the second plane 7 at a distance upstream of the second wake object 5, and the second plane 7 and the second rotational plane 9 are substantially parallel.

[0034] Furthermore, in the vertical vortex wind turbine 1 of this embodiment, the first wake object 2 and the second wake object 5 are ring-shaped or cylindrical, and the outer diameter D' of the second wake object 5 is out The outer diameter D of the first downstream object 2 is out It is larger than that.

[0035] Furthermore, in addition to the first wake body 2, the first rotating body 4, the second wake body 5, and the second rotating body 13, the vertical vortex wind turbine 1 of this embodiment further includes a wake body 17 and a rotating body 18.

[0036] With the above configuration, it is possible to further improve the performance of the wind turbine. [Explanation of symbols]

[0037] 1 Vertical vortex wind turbine 2 1st wake object 3 Rotating shaft 4. First Rotating Body 5 Second wake object 6 1st plane 7 Second plane 8. First rotational surface 9. Second rotational plane 10 First intersection 11 The reverse side of the second plane 12 Second intersection 13. Second Rotational Body 14 Third Intersection 15 Support section 16 Main Wing Section 17 Wake object 18. Solids of revolution F: Direction of fluid flow D out Outer diameter of the first downstream object D' out Outer diameter of the second downstream object

Claims

1. A first wake object having a first plane that intersects substantially perpendicularly with respect to the fluid flow direction, A rotating shaft body substantially parallel to the direction of fluid flow, A first rotating body is pivotally supported by the rotating shaft and positioned upstream of the first downstream object, and rotates about the rotating shaft in a first rotational plane that intersects substantially perpendicular to the direction of fluid flow, A second downstream object is positioned upstream of the first rotating body and has a second plane that intersects substantially perpendicularly with respect to the fluid flow direction, Equipped with, The first rotating body has a first intersection portion that intersects the first plane at a distance from the upstream side of the first wake object, A vertical vortex wind turbine in which the first plane, the first rotational plane, and the second plane are substantially parallel.

2. The first rotating body has a second intersection portion that intersects with the back surface of the second plane, separated from the downstream side of the second wake object. The vertical vortex wind turbine according to claim 1, wherein the first rotating surface and the back surface of the second plane are substantially parallel.

3. The system further comprises a second rotating body that is pivotally supported by the rotating shaft and positioned upstream of the second downstream object, and rotates about the rotating shaft in a second rotational plane that intersects substantially perpendicularly with respect to the fluid flow direction, The second rotating body has a third intersection portion that intersects the second plane at a distance from the upstream side of the second wake object, The vertical vortex wind turbine according to claim 1 or 2, wherein the second plane and the second rotational plane are substantially parallel.

4. The vertical vortex wind turbine according to claim 1 or 2, wherein the first wake object and the second wake object are ring-shaped or cylindrical, and the outer diameter of the second wake object is larger than the outer diameter of the first wake object.

5. The vertical vortex wind turbine according to claim 3, further comprising a wake body and a rotating body in addition to the first wake body, the first rotating body, the second wake body, and the second rotating body.

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