Rotating device

Abstract

To provide a rotation device using longitudinal vortexes, in which performance such as a rotation speed against a flow speed and power and torque associated with rotation is improved.SOLUTION: A rotation device comprises a wake flow body composed of: a rotational shaft body that rotates with a flow direction for fluid as a rotational axis; a rotation body arranged so as to rotate around the rotational shaft body; a rear part spaced apart from the rotation body and arranged on the downstream side in the flow direction for fluid between the center of rotation of the rotation body and the end part of the rotation body; and an inclined part connected to the rear part and having a projection surface inclined toward the rotation body side.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rotating device. [Background technology]

[0002] One of the rotating devices that utilizes natural energy that is readily available is one that utilizes flow energy. The inventors of the present invention have developed a rotating device for fluid power generation that utilizes this method (Patent Document 1).

[0003] This rotating device comprises a rotating shaft that is approximately parallel to the fluid flow direction, a rotating body arranged to rotate around the rotating shaft within a rotation plane that intersects approximately perpendicularly to the fluid flow direction, and a wake object having at least two intersection points that intersect with and are spaced apart downstream in the fluid flow direction from the rotating body, and the rotation plane of the rotating body and the surface of the wake object that receives the fluid flow are approximately parallel.

[0004] In this type of rotation device, the rotor rotates by utilizing the longitudinal vortices that are generated at the intersection with the wake object, but in rotation devices that utilize this principle, there is a demand for improvements in performance such as the rotation speed relative to the flow velocity, and the power and torque associated with the rotation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6378366 Summary of the Invention [Problem to be solved by the invention]

[0006] The technology described in Patent Document 1 had the problem that, in order to secure the space necessary for the rotation of the rotor, the surface of the wake object receiving the fluid flow cannot intersect with the rotational surface of the rotor and the surface of the wake object receiving the fluid flow, even when the arrangement is such that the gap between the rotor and the wake object changes in the circumferential direction of the rotor, making it difficult to improve performance such as the rotation speed relative to the flow velocity and the power and torque associated with the rotation.

[0007] In view of the above problems, an object of the present invention is to provide a rotating device that utilizes longitudinal vortices and has improved performance such as the rotation speed relative to the flow velocity and the power and torque associated with the rotation. [Means for solving the problem]

[0008] The inventors of the present invention have conducted intensive research into the above-mentioned problems and have discovered that the performance of a rotating device can be improved by tilting part of the surface of the wake object that receives the fluid flow toward the rotating body, and rotating the wake object in the same manner as the rotating body so that the rotation surface of the rotating body and the surface of the wake object that receives the fluid flow can intersect, thereby improving the rotation speed relative to the flow velocity and the power and torque associated with the rotation, which led to the completion of the present invention.

[0009] In other words, a rotating device according to one aspect of the present invention that solves the above-mentioned problems comprises a rotating shaft body that rotates with the flow direction of the fluid as its rotation axis, a rotating body arranged to rotate around the rotating shaft body, and a wake body consisting of a rear portion that is spaced apart from the rotating body and arranged downstream in the flow direction of the fluid between the rotation center of the rotating body and the end of the rotating body, and an inclined portion connected to the rear portion and having a protruding surface inclined toward the rotating body.

[0010] Also, in this respect, although not limited thereto, it is preferable that the wake object has the same rotation axis as the rotation axis of the rotating body and rotates in synchronous with the rotating body within a rotation plane that is approximately parallel to the rotation plane of the rotating body.

[0011] Also, in this respect, although not limited thereto, it is preferable that the rear portion of the wake object has a protruding surface.

[0012] Also, in this respect, although not limited thereto, it is preferable that the surface of the rear part of the wake object that receives the fluid is approximately perpendicular to the flow direction of the fluid.

[0013] Also, in this respect, although not limited thereto, it is preferable that the surface receiving the fluid at the rear part of the wake object is arranged inclined toward the upstream side in the flow direction of the fluid.

[0014] Also, in this respect, although not limited thereto, if the protruding surface width of the rear portion is taken as 1, it is preferable that the rotating body has a length of 1 or more on each side in the longitudinal direction so that the rotating body does not overlap at the point where it intersects with the protruding surface of the rear portion.

[0015] Also, in this respect, although not limited thereto, it is preferable that the wake object is positioned at a distance from the rotating body that generates a longitudinal vortex that drives the rotating body in the rotational direction, and it is preferable that the distance is variable.

[0016] In addition, in this respect, although not limited thereto, it is preferable that a plurality of wake objects are provided, and that the plurality of wake objects are arranged so that the protruding surfaces of the inclined portions protrude on the opposite side to the center of rotation of the rotating body. Effect of the Invention

[0017] As described above, the present invention can provide a rotating device that utilizes longitudinal vortices and has improved performance such as the rotation speed relative to the flow velocity and the power and torque associated with the rotation. [Brief description of the drawings]

[0018] [Figure 1] Schematic diagram of a vertical vortex generator [Diagram 2] Schematic diagram of how longitudinal vortex-induced vibration occurs [Diagram 3] Diagram showing the relationship between the rotating body and the wake object [Figure 4] Schematic diagram of an embodiment [Diagram 5] External view of the embodiment [Figure 6] A diagram showing an example of the shape of a rotating body and a wake object. [Figure 7] FIG. 1 is a diagram showing an example of the relationship between a rotating body and a wake object; [Figure 8] Example of wake object placement [Figure 9] Schematic of a wake object [Figure 10] Schematic of a wake object [Figure 11] Schematic of a wake object [Figure 12] Schematic of a wake object [Figure 13] FIG. 13 is a diagram showing the number of rotations relative to the wind speed in the embodiment. [Figure 14] FIG. 13 is a diagram showing a power coefficient versus a tip speed ratio in an embodiment. [Figure 15] FIG. 13 is a diagram showing a torque coefficient versus a peripheral speed ratio in an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention can be embodied in many different forms, and is not limited to the specific examples described in the following embodiments and examples.

[0020] (Vertical vortex) FIG. 1 is a schematic diagram of a longitudinal vortex generator having a cylinder 20 arranged so that the longitudinal direction y intersects with the fluid flow direction, and a flat plate 30 arranged at a distance from the cylinder 20 downstream of the fluid flow direction so that the longitudinal direction z intersects with the cylinder 20. The longitudinal vortex is generated in a gap formed by spatially intersecting the cylinder 20 and the flat plate 30. When the separation gap (s1) between the cylinder 20 and the flat plate 30 is slightly changed, the longitudinal vortex takes two forms: a necklace vortex and a trailing vortex. The longitudinal vortex shown in FIG. 1 is a schematic diagram of a necklace vortex NV.

[0021] The parallel vibration of the cylinder 20 due to the necklace vortex excitation vibration is considered to be based on the principle shown in FIG. 2. That is, in FIG. 2(a), in the gap between the cylinder 20 and the flat plate 30, a longitudinal vortex 101 is generated in the region below the center of the cylinder 20, and a downward force 102 is generated in the cylinder 20. In addition, a reverse flow occurs downstream of the separation point P, and a vortex region is formed behind it. After that, in the gap between the cylinder 20 and the flat plate 30, a longitudinal vortex 103 is generated in the region above the center of the cylinder 20, and an upward force 104 is generated in the cylinder 20. As in the above case, a reverse flow occurs downstream of the separation point P, and a vortex region is formed behind it. In this way, the longitudinal vortices 101 and 103 are generated alternately in the upper and lower regions of the cylinder 20, and become a vibration force, causing the longitudinal vortex excitation vibration phenomenon.

[0022] In contrast, when the cylinder 20 moves at a constant speed in the longitudinal (z) direction of the flat plate 30 as shown in Fig. 3 (here, an upward force 200 is applied), a longitudinal vortex is stably generated on one side of the cylinder. That is, when the cylinder 20 moves upward at a constant speed as shown in Fig. 3(a), a longitudinal vortex 201 is generated in the region below the center of the cylinder 20 in the gap s1 between the cylinder 20 and the flat plate 30. This motion makes the flow field asymmetric, a negative slope is formed in the lift coefficient, and a constant force acts in the z direction perpendicular to the flow direction 10 of the fluid.

[0023] This is the operating principle of a rotation device that utilizes vertical vortices, and by utilizing this principle, the columnar body 20 can rotate at a constant rotational speed with its rotation axis approximately parallel to the fluid flow direction 10.

[0024] When the flat plate 30 is arranged with an inclination of θ toward the upstream side of the fluid flow direction as shown in Fig. 3(b) with respect to the fluid flow direction, the strength of the vertical vortex changes depending on the clearance s1' at which the distance between the surface of the cylinder 20 and the flat plate 30 is the smallest, so that the force acting on the cylinder 20 becomes asymmetric in the vertical direction with respect to the center of the cylinder 20. However, as disclosed in Patent Document 1, when the upper end and the lower end of the flat plate 30 are fixed so that the distance from the z axis is different, for example, when the distance d1 between the upper end of the flat plate 30 and the z axis is fixed to be smaller than the distance d2 between the lower end of the flat plate 30 and the z axis, the force acting on the cylinder 20 is regulated in a certain direction, and the rotation direction can be specified. However, on the other hand, since d1 needs to be less than the radius of the cylinder, the flat plate 30 cannot be arranged at a position where the clearance s1' is the optimum distance for generating vertical vortexes, and the rotation force of the cylinder cannot be increased.

[0025] In order to place the flat plate 30 in the gap s1' where the longitudinal vortex is generated most strongly, it is necessary to place the flat plate 30 at a position where the surface of the flat plate 30 intersects with the plane of rotation on which the cylinder 20 rotates, that is, at a position where d1 is equal to or smaller than the radius of the cylinder 20. Even if the flat plate 30 is placed at such a position, the rotating body 2 does not come into contact with the flat plate 30 by moving the flat plate 30 in the same manner as the rotating body 2, and the inflow velocity of the fluid into the gap is improved, and the longitudinal vortex 201 generated in the downward region of the cylinder 20 is generated more strongly than when the flat plate 30 in FIG. 3(a) is placed parallel to the z-axis.

[0026] (Rotating device) Fig. 4 is a schematic diagram of the rotating device in this embodiment, and Fig. 5 is an external view. The rotating device in this embodiment includes a rotating shaft body that rotates with the fluid flow direction as its rotation axis, a rotating main body arranged to rotate around the rotating shaft body, and a wake object consisting of a rear part that is separated from the rotating main body and arranged downstream in the fluid flow direction between the rotation center of the rotating main body and the end of the rotating main body, and an inclined part that is connected to the rear part and has a protruding surface inclined toward the rotating main body.

[0027] (Rotating shaft) The rotating shaft 1 may be made of any material and may have any shape as long as it has the strength required to support the rotation of the rotating main body 2. In addition, it may be composed of a plurality of members.

[0028] (Rotating body) The rotating body 2 preferably has a cross-sectional shape in the longitudinal direction (zx cross-section) that is a circle such as a perfect circle or an ellipse, a polygon, a streamlined shape, or a propeller blade shape. The cross-sectional shape may change between the rotation center 2c of the rotating body 2 and the end of the rotating body 2. The cross-sectional shape between the rotation center 2c of the rotating body 2 and the end of the rotating body 2 is preferably a point-symmetric shape with the rotation center 2c as the center, but the cross-sectional shape can be used for the rotating body 2 even if it is not point-symmetric.

[0029] The rotating body 2 may be configured with a support section 21 having a smaller diameter than the rotating body 2, except for the vicinity of the intersection with the wake object 3 that intersects with a distance on the downstream side in the fluid flow direction (FIG. 6). Having a support section 21 with a small diameter is advantageous when multiple rotating bodies 2 are installed on the same rotating shaft 1. It also makes it possible to reduce the rotational resistance of the rotating body 2. Note that the support section 21 may be of any material or structure as long as it has the strength to support the rotating body 2. For example, when the support section 21 is columnar, the support diameter of the support section 21 may be uniform in the longitudinal direction, or may change continuously or discontinuously.

[0030] (Rotation direction) The rotating body 2 and the wake object 3 rotate in either a first rotation direction in which the inclined portion 31 described later is the rotation leader, or a second rotation direction in which the rear portion 32 described later is the rotation leader. This is because, at the time when the rotating body 2 starts to move, longitudinal vortices are generated in the gap between the rotating body 2 and the wake object 3 on both sides of the longitudinal central axis (Y-axis) of the rotating body 2, in accordance with the motion direction of the rotating body 2.

[0031] (wakestream object) The wake object 3 consists of a rear portion 32 and an inclined portion 31. The wake object has the same rotation axis as the rotation axis of the rotating body and rotates synchronously with the rotating body in a rotation plane approximately parallel to the rotation plane of the rotating body. In order for the rotating body 2 and the wake object 3 to rotate synchronously, the wake object 3 may be fixed to the rotating body 2, for example, as shown in FIG. 5. Alternatively, the wake object 3 may be fixed to the rotating shaft 1, or may be connected to a rotating shaft different from the rotating shaft 1 to which the rotating body 2 is connected, and rotated synchronously with the rotating body 2.

[0032] (Wake object: protruding surface) When looking at the rotating body 2 and the wake object 3 parallel to the flow direction from the upstream to the downstream of the fluid flow, if a part of the wake object 3 has a surface that protrudes from the rotating body 2 and receives the fluid flow, hereafter, that protruding surface that receives the fluid flow will be referred to as the "protruding surface", and the length of the protruding surface along an axis (y-axis) parallel to the longitudinal direction of the rotating body 2 will be referred to as the "protruding surface width", and the length along an axis (z-axis) perpendicular to both the longitudinal direction of the rotating body 2 and the fluid flow direction will be referred to as the "protruding surface length".

[0033] (Wake object: rear part) It is preferable that the surface of the rear portion 32 that receives the fluid is substantially perpendicular to the direction of the fluid flow. It is further preferable that the surface of the rear portion 32 that receives the fluid has a flat shape.

[0034] (Wake object: rear protruding surface) The rear portion may have a protruding surface. If the rear portion 32 has a protruding surface, the time during which vertical vortices are generated in the separation gap s1 increases, making it easier for a pressure gradient to form. However, the protruding surface of the rear portion 32 acts as a resistance to the flow of the fluid, and the magnitude of this resistance is proportional to the area of ​​the protruding surface. Therefore, it is necessary to determine an upper limit for the area of ​​the protruding surface, taking into account the flow speed of the fluid, the mechanical strength of the rear portion, and the like.

[0035] The rear part may be arranged so that the surface receiving the fluid of the rear part is inclined toward the upstream side in the direction of the fluid flow. That is, the rear part may be arranged so that the y-axis is the rotation axis and the rear part is inclined at an arbitrary angle θ toward the upstream side in the direction of the fluid flow with respect to the z-axis. Preferably, the rear part has a protruding surface, and the protruding surface is arranged so that the y-axis is the rotation axis and the protruding surface is inclined at an arbitrary angle θ toward the upstream side in the direction of the fluid flow with respect to the z-axis. This has the effect of increasing the flow velocity of the fluid flowing into the separation gap s1 between the rotating body 2 and the protruding surface of the rear part during rotation in the first rotation direction, and strengthening the strength of the vertical vortex. The θ of the protruding surface of the rear part and the other surfaces may be different, but since the rotational resistance of the wake object 3 also increases during rotation in the first rotation direction, it is necessary to determine it taking into consideration the flow velocity of the fluid, the rotational speed of the rotating body 2, etc.

[0036] (Wake object: rear protruding surface width) In order to further enhance the effect of the pressure gradient formed on the rotating body 2 by the wake object 3, when the protruding surface width of the rear part is 1, it is preferable that the rotating body has a length of 1 or more on each side in the longitudinal direction so that the rotating body does not overlap with the part intersecting the protruding surface (Fig. 6). In other words, when the protruding surface width of the rear part is W, it is preferable that the longitudinal length of the rotating body including the part intersecting the protruding surface is 3W or more.

[0037] The width W of the fluid receiving surface of the rear portion 32 is preferably 1 to 1.5 times the diameter D of the rotating body 2 in order to improve performance, but there is no limitation thereto.

[0038] (Wake object: inclined part) The inclined portion is preferably arranged with a protruding surface connected to the rear portion disposed between the rotation center of the rotating body and the end of the rotating body and inclined toward the rotating body. That is, the inclined portion 31 has a protruding surface, and is arranged at a connection portion with the rear portion, with the y-axis as the rotation axis, inclined at an arbitrary angle θ with respect to the z-axis on the upstream side of the fluid flow direction. θ can be adjusted within an angle range that is greater than 0° with respect to the z-axis and does not contact the rotating body 2. It is preferably greater than 0° and is equal to or less than 45°, and more preferably is equal to or greater than 20° and is equal to or less than 40°. The surface of the inclined portion 31 that receives the fluid flow may be flat, or at least a part of the surface may be curved and concave with respect to the fluid flow. However, it is preferable that the surface of the inclined portion 31 that receives the fluid flow has a shape that does not have holes or apertures through which the fluid can pass. The surface of the inclined portion 31 may be flat or uneven, and there is no restriction.

[0039] (Wake object: Inclined protruding surface) The inclined portion 31 has a protruding surface, which makes it easier for the fluid flow to be guided into the gap s1 between the rotating body 2 and the rear portion 32, increasing the pressure gradient between the upper and lower regions of the rotating body 2, i.e., the front and rear of the rotating body 2 in the direction of rotation. A larger pressure gradient makes it easier for the rotating body 2 to rotate. In addition, during rotation in the first rotation direction, the inclined portion is subjected to dynamic pressure that is oriented in the same direction as the rotation direction due to the fluid flow, thereby increasing the rotational force of the rotating body 2.

[0040] (Distance between rotating body and wake object) The wake object is disposed at a distance from the rotating body that generates a longitudinal vortex that drives the rotating body in the rotation direction. FIG. 7 shows an example of the arrangement of the rotating body 2 and the wake object 3. The separation distance s between the rotating body 2 and the wake object 3 in this embodiment is the distance parallel to the x-axis between the downstream end of the rotating body 2 in the fluid flow direction in the zx cross section and the surface of the rear part receiving the fluid flow. The separation distance s is not limited as long as it is a distance at which a longitudinal vortex is generated. For example, when the cross-sectional width of the rotating body 2 (the diameter D when the rotating body 2 is a cylinder) is 1, the separation distance s is preferably about 1.3 times (1.3D) the cross-sectional width of the rotating body 2. However, the optimal separation distance varies depending on the cross-sectional shape of the rotating body 2, the protruding surface width and protruding surface length of the inclined part 31, the inclination θ of the protruding surface with respect to the z axis, or the presence or absence of a protruding surface of the rear part 32, the protruding surface width, the protruding surface length, etc. Therefore, it is preferable that the separation distance between the rotating body and the rear part is variable. By varying the separation distance s, it is possible to obtain the desired rotation speed, power, and torque for a rotating body and wake object of any shape.

[0041] (Wake body: Connection between the inclined section and the rear section) The shape of the connection portion 3B between the inclined portion 31 and the rear portion 32 that constitute the wake object 3 may be linear or curved. It is preferable that the connection portion 3B has a smooth shape without any protrusions that may hinder the flow of the fluid when it is guided to the separation gap s1, or any holes or apertures through which the fluid passes through the wake object.

[0042] The connecting portion 3B is preferably disposed at a position where it can receive the flow of the fluid separated from the rotating body 2. The position where it can receive the flow of the fluid separated from the rotating body 2 is a position away on both sides of the z-axis about 0.5 times the thickness (length in the z-axis direction) of the rotating body. For example, when the rotating body 2 is cylindrical as shown in FIG. 7, the position of the connecting portion 3B is approximately in the range of FIG. 8(a) to (e), up to a position away from the cross-sectional center (x-axis) of the rotating body 2 on both sides of the z-axis direction by a distance of about the thickness (diameter D). From the viewpoint of efficiently receiving the flow of the fluid separated from the rotating body 2, the position of the connecting portion 3B is preferably a position other than the protruding surface (in the range of FIG. 8(b) to (d)), and more preferably a position other than the protruding surface and forward of the cross-sectional center (x-axis) of the rotating body 2 in the direction of rotation of the rotating body 2 (in the range of FIG. 8(b) to (c) when rotating in the first direction of rotation). By positioning the connecting portion 3B in such a position, it is possible to efficiently generate a vertical vortex that serves as a driving force.

[0043] (Wake object: length of inclined part) The length ls of the inclined portion 31 shown in Figure 7 is not limited because the optimal value varies depending on the shape of the rotating body, the angle θ of the inclined portion, the rotation speed, etc., but it is preferable that the length be longer than the length at which at least a portion of the inclined portion forms a protruding surface, and shorter than the length from the connection portion 3B to the intersection with the z-axis passing through the cross-sectional center of gravity of the rotating body 2.

[0044] (Wake body: length of rear part) In addition, the length lb of the rear portion 32 shown in Figure 7 is not limited as the optimal value varies depending on the shape of the rotating body, the position of the connection part 3B, the separation distance, etc., but it is preferable that the length from the connection part 3B to at least approximately twice (2D) the thickness of the rotating body 2 (its diameter D if the rotating body 2 is cylindrical) is not more than this.

[0045] (Wake body: vortex adjustment part at the rear) As shown in FIG. 9, the rear part 32 of the wake object 3 can be provided with a vortex adjustment part 33 that is longer than the width of the protruding surface of the inclined part 31 and does not protrude from the rotating body 2. The vortex adjustment part 33 has a length in the z-axis direction that is less than half the thickness of the rotating body 2 (if the rotating body 2 is cylindrical, its diameter D), and is preferably disposed on the front side of the rotating body 2 in the rotation direction. When a plurality of wake objects 3 are disposed on both sides of the rotation center of the rotating body, the vortex adjustment part 33 is disposed at a position that is point symmetrical with respect to the rotation center 2c of the rotating body 2. By providing a vortex adjustment part, the generation position of the vertical vortex can be adjusted, and the effect of making the rotation direction of the rotating body 2 constant can be enhanced. Even when a mechanism for regulating the rotation direction of the rotating body 2 or a rotation control function is incorporated into the rotating device, the stability of the rotation direction can be improved by providing a vortex adjustment part.

[0046] It is preferable that the y-axis length of the vortex adjustment part 33 has a length of 1 or more on both sides from the width of the rear part 32, assuming that the y-axis length of the rear part 32 is 1. This makes it possible to fix the wake object 3 to the rotating body 2 by utilizing the vortex adjustment part while maintaining the effect of forming a pressure gradient by the wake object 3.

[0047] (Wake object: width of protruding surface of inclined part and rear part) The protruding surface width of the inclined portion 31 can be any length in the range from the center of rotation of the rotating body 2 to the end. Increasing the protruding surface width of the inclined portion increases the flow rate of the fluid guided to the rear portion 32, and increases the strength of the longitudinal vortex generated in the separation gap. However, the protruding surface of the inclined portion 31 acts as a resistance to the flow of the fluid, and since the magnitude of this resistance is proportional to the area of ​​the protruding surface, it is necessary to determine the upper limit of the area of ​​the protruding surface by taking into account the flow speed of the fluid, the mechanical strength of the inclined portion, etc.

[0048] It is preferable that the width of the rear portion 32 is equal to or smaller than the width of the inclined portion 31 (FIG. 10). This has the effect of making it possible to identify and control the position at which vertical vortices are generated.

[0049] A plurality of rear sections 32 may be disposed in the range from the rotation center to the end of the rotating body 2. The plurality of rear sections 32 has the effect of increasing the number of locations where vertical vortices are generated (FIG. 11).

[0050] A plurality of rear sections 32 may be provided on one inclined section 31 (FIG. 12). A separate protruding surface may be provided on each of the plurality of rear sections. This has the effect of inducing the generation of a plurality of longitudinal vortices and increasing the fluid force.

[0051] (Number of wake objects) When multiple wake objects are provided on either side of the rotation center of the rotating body, it is preferable that the protruding surfaces of the inclined parts of the multiple wake objects are arranged on the opposite side of the rotation center of the rotating body. That is, it is preferable that at least two inclined parts 31 are arranged at the rotation front when rotating in the first rotation direction, and at least two rear parts 32 are arranged at the rotation front when rotating in the second rotation direction. As shown in Figures 4 to 6 and 9 to 12, when multiple inclined parts 31 are arranged linearly along the longitudinal direction (y axis) of the rotating body 2, efficient rotation is possible when the protruding surfaces of the inclined parts 31 are arranged at positions point-symmetrical with respect to the rotation center 2c, but multiple wake objects 3 may be arranged at different distances from the rotation center of the rotating body 2.

[0052] As described above, this rotation device can provide a rotation device that utilizes longitudinal vortices and has improved performance such as the rotation speed relative to the flow velocity and the power and torque associated with the rotation. EXAMPLES

[0053] The rotating device utilizing vertical vortices according to the present invention will be specifically described below.

[0054] A total of two wake objects were attached to a rotating body with a total length of 220 mm that can rotate around a rotating shaft, one on each side of the center of rotation of the rotating body. The rotating shaft was disposed at a position that equally divides the total length of the rotating body. The width of the surface of the wake object that receives the fluid flow was 30 mm, the same at the inclined portion and the rear portion. The wake object used had a surface that receives the fluid flow at the rear portion that is approximately perpendicular to the fluid flow, and the angle θ of the inclined portion toward the upstream side in the fluid flow direction was 0 degrees (Comparative Example), 20 degrees (Example 1), and 40 degrees (Example 2). The separation distance s1 between the rotating body and the rear portion of the wake object was 7 mm.

[0055] The rotation speed n, power coefficient Cp, and torque coefficient Cq for wind speed U were the values ​​when the rotating device was placed in a wind tunnel test machine and the rotating body rotated at a constant speed (measuring device: Unipulse, UTMII-0.2Nm). The power coefficient Cp and torque coefficient Cq were calculated using equations (1) and (2), respectively, and the relationship with the peripheral speed ratio λ, which is the ratio of the angular velocity ω of the rotating body to the wind speed U, was compared. Here, T is the torque, ρ is the density of the fluid, A is the projected area of ​​the rotation surface of the cylinder during rotation, and R is the distance from the center of rotation of the rotating body to the end of the rotating body.

[0056]

number

[0057]

number

[0058] 13, at a wind speed of 6 m / s, Example 1 was 1.6 times and Example 2 was 2.7 times as large as the Comparative Example. At a wind speed of 15 m / s, Example 1 was 1.8 times and Example 2 was 2.5 times as large as the Comparative Example.

[0059] 14 shows the results of measuring the relationship between tip speed ratio and power coefficient at a wind speed of 10 m / s. The maximum power coefficient was 0.003 (λ=0.12) for the comparative example, 0.007 (λ=0.23) for example 1, and 0.014 (λ=0.36) for example 2, which means that example 1 was 2.1 times and example 2 was 4.3 times larger than the comparative example.

[0060] 15 shows the results of measuring the relationship between the tip speed ratio and the power coefficient at a wind speed of 10 m / s. The maximum torque coefficient was 1.2 times higher in Example 1 and 1.7 times higher in Example 2 than in the comparative example. [Industrial Applicability]

[0061] According to the rotating device of the present invention, there is no particular limit to the size, so it can be applied to all wind turbines or water turbines of large, medium, small and micro sizes, and by providing a power generating motor, it can be used as a generator. [Explanation of symbols]

[0062] 1 Rotating shaft 2 Rotating body 3 Wake object 10 Fluid flow direction 20 columnar body 21 Support part 30 flat plate 31 Slope 32 Posterior part 33 Vortex adjustment section 100 Rotating Device 101,103,201 Vertical vortex s1,s1' gap s Separation distance

Claims

1. A rotating shaft body that rotates around a rotation axis in the direction of the fluid flow; A rotating body arranged to rotate around the rotating shaft body; a wake body including a rear portion disposed downstream in a flow direction of the fluid between a rotation center of the rotating body and an end portion of the rotating body, the rear portion being connected to the rear portion and having a protruding surface inclined toward the rotating body; A rotating device in which the wake object is positioned at a distance from the rotating body that generates a longitudinal vortex that drives the rotating body in a rotational direction.

2. The rotating device according to claim 1 , wherein the wake object has the same rotation axis as the rotation axis of the rotating body within a rotation plane substantially parallel to the rotation plane of the rotating body and rotates in synchronization with the rotating body.

3. The rotating device according to claim 1 or 2, wherein the rear portion has a protruding surface.

4. The rotation device according to claim 1 , wherein a surface of the rear portion that receives the fluid is substantially perpendicular to a flow direction of the fluid.

5. The rotation device according to claim 1 , wherein a surface of the rear portion that receives the fluid is disposed so as to be inclined toward an upstream side in a flow direction of the fluid.

6. A rotating device as described in claim 3, wherein when the protruding surface width of the rear portion is 1, the rotating body further has a length of 1 or more on each side in the longitudinal direction so that the rotating body does not overlap at the point where it intersects with the protruding surface of the rear portion.

7. The rotating device of claim 1 , wherein the separation distance is variable.

8. A plurality of the wake objects are provided, The rotating device according to claim 1 , wherein the plurality of wake objects are arranged such that the protruding surfaces of the inclined portions are disposed on an opposite side to the center of rotation of the rotating body.

Images