JP2023007015A - Rotation device - Google Patents

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

The present invention relates to rotating devices.

One of the familiar rotating devices using natural energy is the method of using flow energy. The inventors of the present invention have developed a rotating device for hydrodynamic power generation using this method (Patent Document 1).

This rotating device includes a rotating shaft substantially parallel to the flow direction of the fluid, and a rotating body arranged to rotate about the rotating shaft within a plane of rotation that intersects substantially perpendicularly to the flow direction of the fluid. and a wake body having at least two intersecting portions spaced apart from each other on the downstream side in the direction of flow of the fluid with respect to the body of rotation, wherein the rotating surface of the body of revolution and the wake body receiving the flow of the fluid. is substantially parallel to the plane of

In this rotating device, the rotating body rotates by utilizing the longitudinal vortex generated at the intersection with the trailing object. There is a demand for improved performance.

Japanese Patent No. 6378366

In the technique described in Patent Document 1, in order to secure the space necessary for the rotation of the rotating body, the surface of the wake object that receives the flow of the fluid has a gap between the rotating body and the wake object so that the rotating body rotates. Even when the arrangement changes in the circumferential direction, the rotating surface of the rotating body and the surface of the trailing body receiving the fluid flow cannot intersect, and the number of rotations relative to the flow velocity and the power and torque accompanying the rotation There has been a problem that it is difficult to improve performance such as.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a rotating device that utilizes longitudinal vortices and that has improved performance such as the number of revolutions relative to the flow velocity and the power and torque associated with the rotation.

The inventors of the present invention have made intensive studies on the above problem, and found that a part of the surface of the wake object that receives the flow of the fluid is tilted toward the rotating body, and the wake object rotates in the same manner as the rotating main body. By arranging it so that the rotating surface of the rotating body and the surface of the trailing body that receives the fluid flow can intersect, the performance of the rotating device, such as the number of rotations relative to the flow velocity and the power and torque associated with rotation, is improved. I discovered that it does, and came to complete the present invention.

That is, a rotating device according to one aspect of the present invention for solving the above problems includes a rotating shaft body that rotates about the flow direction of a fluid as a rotating shaft, a rotating body arranged to rotate about the rotating shaft body, a rotating A rear part that is spaced apart from the main body and located downstream in the flow direction of the fluid between the center of rotation of the rotating body and the end of the rotating body, and an inclined surface that is connected to the rear part and has a projecting surface that inclines toward the rotating body. and a wake body comprising:

In addition, in this aspect, although not limited, the trailing body has the same rotation axis as the rotation axis of the rotation main body and is synchronized with the rotation main body within a rotation plane substantially parallel to the rotation surface of the rotation main body. preferably rotated.

In addition, in this aspect, it is preferable, but not limited, that the trailing portion of the wake body has a protruding surface.

Moreover, in this aspect, although not limited, it is preferable that the surface of the trailing body that receives the fluid is substantially perpendicular to the flow direction of the fluid.

Moreover, in this aspect, although not limited, it is preferable that the surface of the rear portion of the trailing body that receives the fluid is inclined toward the upstream side in the flow direction of the fluid.

In this aspect, although not limited, when the width of the protruding surface of the rear portion is set to 1, the rotating main body is further arranged so as not to overlap from the portion where the protruding surface of the rear portion intersects the rotating main body. It is preferred to have one or more lengths on each side in the longitudinal direction.

In addition, in this aspect, although not limited, the trailing body is preferably arranged with a separation distance that generates a longitudinal vortex that drives the rotation body from the rotation body in the direction of rotation. is preferably variable.

Further, in this aspect, although not limited, a plurality of wake bodies are provided, and the plurality of wake bodies are arranged so that the protruding surface of the inclined portion protrudes on the side opposite to the rotation center of the rotating body. preferably.

As described above, according to the present invention, it is possible to provide a rotating device that utilizes longitudinal vortices and that has improved performance such as the number of revolutions relative to the flow velocity and the power and torque associated with the rotation.

Schematic diagram of longitudinal vortex generator Schematic diagram of longitudinal vortex-excited vibration Diagram showing the relationship between the rotating body and the trailing body Schematic of embodiment External view of embodiment A diagram showing an example of the shape of the rotating main body and the trailing body A diagram showing an example of the relationship between the rotating main body and the trailing object. Arrangement example of trailing object Schematic of a wake object Schematic of a wake object Schematic of a wake object Schematic of a wake object The figure which shows the rotation speed with respect to the wind speed in an Example A diagram showing a power coefficient with respect to a peripheral speed ratio in an example A diagram showing a torque coefficient with respect to a peripheral speed ratio in an example

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, 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 exemplifications described in the embodiments and examples given below.

(longitudinal vortex)
FIG. 1 shows a columnar body 20 disposed so that the longitudinal direction y intersects the fluid flow direction, and a longitudinal direction z intersecting with the columnar body 20 at a distance downstream in the fluid flow direction. 3 is a schematic view of a longitudinal vortex generator with a flat plate 30 arranged to do so; FIG. A vertical vortex is generated in a gap formed by the spatial intersection of the columnar body 20 and the flat plate 30 . If the gap (s1) between the columnar body 20 and the flat plate 30 is slightly changed, the longitudinal vortex takes two forms of a necklace vortex and a trailing vortex. The longitudinal vortex shown in FIG. 1 is a schematic diagram of the necklace vortex NV.

Parallel vibration of the columnar body 20 by necklace vortex excitation vibration is considered to be based on the principle shown in FIG. That is, in FIG. 2A, in the gap between the columnar body 20 and the flat plate 30, a longitudinal vortex 101 is generated in a region below the center of the columnar body 20, and a downward force 102 is generated in the columnar body 20. . In addition, a reverse flow occurs on the downstream side of the separation point P, and a vortex region is formed behind it. After that, in the gap between the columnar body 20 and the flat plate 30 , a longitudinal vortex 103 is generated in an area above the center of the columnar body 20 , and an upward force 104 is generated in the columnar body 20 . As in the previous case, a reverse flow occurs downstream of the separation point P, forming a vortex region behind it. In this way, the longitudinal vortices 101 and 103 are alternately generated in the upper region and the lower region of the columnar body 20 to generate vibrating force, and the longitudinal vortex excitation vibration phenomenon occurs.

On the other hand, when the columnar body 20 moves at a constant speed in the longitudinal (z) direction of the flat plate 30 (here, an upward force 200 is applied) as shown in FIG. occur. That is, when the columnar body 20 moves upward at a constant speed as shown in FIG. occurs. This motion makes the flow field asymmetric, creating a negative slope in the lift coefficient and exerting a constant force in the z-direction perpendicular to the flow direction 10 of the fluid.

This is the operating principle of a rotating device that utilizes longitudinal vortices, and by using this principle, the columnar body 20 can be rotated at a constant rotational speed with the axis of rotation substantially parallel to the fluid flow direction 10. can.

As shown in FIG. 3B, when the flat plate 30 is arranged with an inclination of θ toward the upstream side in the fluid flow direction with respect to the fluid flow direction, the strength of the longitudinal vortex is determined by the distance between the surface of the columnar body 20 and the flat plate 30. , the force acting on the columnar body 20 is asymmetrical in the vertical direction with respect to the center of the columnar body 20 . However, as disclosed in Patent Document 1, when the flat plate 30 is fixed such that the distance from the z-axis is different between the upper end and the lower end, for example, the distance d1 between the upper end of the flat plate 30 and the z _- axis is , when the flat plate 30 is fixed so as 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 columnar body 20 is regulated in a fixed direction, and the direction of rotation can be specified. Since d1 must be _less than the radius of the columnar body, the flat plate 30 cannot be placed at a position where the clearance s1' is the optimum distance for generating the longitudinal vortex, and the rotational force of the columnar body cannot be increased.

In order to dispose the flat plate 30 at the separation gap s1′ that is the distance at which the longitudinal vortex is most strongly generated, the position where the surface of the flat plate 30 intersects the plane of rotation on which the columnar body 20 rotates, that is, d1 is the position where the columnar body ₂₀ It is necessary to arrange the flat plate 30 at a position where the radius is less than or equal to . Even if the flat plate 30 is arranged at such a position, by moving the flat plate 30 in the same manner as the rotary main body 2, the rotary main body 2 does not come into contact with the flat plate 30, and the inflow velocity of the fluid into the gap is improved. , the longitudinal vortex 201 generated in the downward region of the columnar body 20 is stronger than when the flat plate 30 of FIG. 3A is arranged in parallel with the z-axis.

(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 of this embodiment includes a rotating shaft that rotates about the direction of fluid flow, a rotating body arranged to rotate about the rotating shaft, and a center of rotation of the rotating body that is separated from the rotating body. a trailing body consisting of a rear portion arranged downstream in the direction of fluid flow between the end portion of the rotating body and an inclined portion connected to the rear portion and having a projecting surface inclined toward the rotating body. .

(Rotating shaft)
The rotary shaft 1 may be made of any material and in any shape as long as it has the strength required to support the rotation of the rotary body 2 . Moreover, you may comprise from several members.

(rotating body)
The rotating body 2 preferably has a longitudinal cross section (zx cross section) having a circular shape such as a perfect circle or an ellipse, a polygonal shape, a streamline shape, or a propeller blade shape. The cross-sectional shape may change between the rotation center 2 c 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 portion of the rotating body 2 is preferably point-symmetrical with respect to the rotation center 2c. 2.

The rotating body 2 may be configured with a strut portion 21 having a diameter smaller than that of the rotating body 2 except for the vicinity of the intersection with the trailing body 3 that intersects with the trailing body 3 spaced apart downstream in the flow direction of the fluid (Fig. 6). Having the pillar portion 21 with a small diameter is advantageous when a plurality of rotating bodies 2 are installed on the same rotating shaft 1 . Also, the rotational resistance of the rotating body 2 can be suppressed. In addition, the support|pillar part 21 should just have the intensity|strength which can support the rotation main body 2, and the material and structure do not ask|require. For example, when the support 21 has a columnar shape, the support diameter of the support 21 may be uniform in the longitudinal direction, or may vary continuously or discontinuously.

(Direction of rotation)
The rotating main body 2 and the trailing object 3 rotate in either direction of a first rotation direction in which the rotation head is the inclined portion 31 described later, or a second rotation direction in which the rotation head is the rear portion 32 described later. . This is because when the rotating body 2 starts to move, longitudinal vortices form in both upper and lower regions of the rotating body 2 across the longitudinal central axis (Y-axis) of the rotating body 2 depending on the direction of movement of the rotating body 2 . This is because it occurs in the gap between 2 and the trailing object 3 .

(wake object)
The wake body 3 consists of a rear portion 32 and an inclined portion 31 . The trailing body has the same rotation axis as the rotation main body and rotates in synchronization with the rotation main body within a rotation plane substantially parallel to the rotation surface of the rotation main 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 as shown in FIG. 5, for example. Alternatively, the trailing body 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 in synchronization with the rotating body 2. good.

(Wake flow object: projecting surface)
When the rotating body 2 and the waken body 3 are viewed parallel to the flow direction from the upstream side to the downstream side of the fluid flow, part of the waker body 3 protrudes from the rotating body 2 to receive the fluid flow. In the case of having a surface, the surface that protrudes to receive the flow of fluid is hereinafter referred to as a "protruding surface", and the length of the protruding surface along the axis (y-axis) parallel to the longitudinal direction of the rotating body 2 is the "protruding surface". The length along the axis (z-axis) perpendicular to both the longitudinal direction of the rotating body 2 and the fluid flow direction is referred to as the "protruding surface length".

(Wake object: rear part)
The rear portion 32 preferably has a surface that receives fluid at the rear portion substantially perpendicular to the flow direction of the fluid. Furthermore, it is preferable that the rear portion 32 has a planar surface that receives the fluid.

(Wake flow object: rear protruding surface)
The rear portion may have a projecting surface. If the rear portion 32 has a protruding surface, the length of time that the longitudinal vortex is generated in the clearance s1 is increased, and a pressure gradient is likely to be formed. However, the projecting surface of the rear portion 32 acts as a resistance to the flow of the fluid, and the magnitude of the resistance is proportional to the area of the projecting surface. It is necessary to determine the upper limit of

The rear portion may be arranged such that the surface of the rear portion that receives the fluid is inclined toward the upstream side in the flow direction of the fluid. That is, the rear portion may be arranged at an arbitrary angle θ with respect to the z-axis toward the upstream side in the fluid flow direction with the y-axis as the rotation axis. Preferably, the rear portion has a protruding surface, and the protruding surface is arranged at an arbitrary angle θ with respect to the z-axis toward the upstream side in the fluid flow direction with the y-axis as the rotation axis. As a result, when rotating in the first rotation direction, the flow velocity of the fluid flowing into the clearance s1 between the rotating body 2 and the rear protruding surface increases, and the strength of the longitudinal vortex increases. θ may be different from that of the protruding surface of the rear part and that of the surface other than the protruding surface. It is necessary to consider and decide.

(Wake object: Width of rear protruding surface)
In order to further enhance the effect of forming a pressure gradient on the rotating body 2 by the trailing object 3, when the protruding surface width of the rear portion is set to 1, the rotating body does not overlap from the portion where it intersects the protruding surface. Furthermore, it is preferable to have one or more lengths on each side of the rotating body in the longitudinal direction (FIG. 6). That is, when the width of the projecting surface of the rear portion is W, it is preferable that the length of the rotating body in the longitudinal direction including the portion intersecting the projecting surface is 3W or more.

The width W of the surface of the rear portion 32 that receives the fluid is preferably 1 to 1.5 times the diameter D of the rotating body 2 for improved performance, but is not limited.

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

(Wake object: Sloping part projecting surface)
Since the inclined portion 31 has a projecting surface, the flow of the fluid is easily guided to the clearance s1 between the rotating body 2 and the rear portion 32, and the upper region and the lower region of the rotating body 2, that is, front and rear with respect to the rotation direction. Increase the pressure gradient. When the pressure gradient is large, the rotating body 2 tends to rotate. In addition, when rotating in the first direction of rotation, the inclined portion receives dynamic pressure in the same direction as the direction of rotation due to the flow of fluid, thereby increasing the rotational force of the rotating body 2 .

(Distance between rotating body and trailing object)
The wake body is positioned with a separation distance from the rotating body that generates a longitudinal vortex that drives the rotating body in a direction of rotation. FIG. 7 shows an arrangement example of the rotating body 2 and the trailing body 3 . The separation distance s between the rotating body 2 and the trailing body 3 in this embodiment is along the x-axis between the downstream end in the fluid flow direction and the surface of the rear part receiving the fluid flow in the zx cross section of the rotating body 2. The separation distance s is not limited as long as it is a distance at which longitudinal vortices are generated. , the separation distance s is preferably about 1.3 times (1.3D) the cross-sectional width of the rotating body 2 . However, the optimum separation distance is determined by the cross-sectional shape of the rotating body 2, the width of the protruding surface of the inclined portion 31, the length of the protruding surface, the inclination θ of the protruding surface with respect to the z-axis, the presence or absence of the protruding surface of the rear portion 32, the width of the protruding surface, It varies depending on the length of the protruding surface, etc. Therefore, the distance between the rotating body and the rear portion is preferably variable. If the separation distance s is made variable, desired rotation speed, power, and torque can be extracted from the rotating main body and the trailing body of arbitrary shape.

(Wake flow object: connecting part between inclined part and rear part)
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. The connection portion 3B preferably has a smooth shape that does not have projections that obstruct the flow of fluid when it is guided to the separation gap s1, or holes or holes through which the fluid passes through the trailing body.

The connecting portion 3B is preferably arranged at a position where it can receive the flow of the fluid separated from the rotating body 2 . The position where the flow of the fluid separated from the rotating body 2 can be received is a position away from both sides of the z-axis by about 0.5 times the thickness (length in the z-axis direction) of the rotating body. For example, when the rotary body 2 as shown in FIG. 7 is a cylinder, the position of the connecting portion 3B is approximately within the range of FIGS. It is up to a position separated by a distance of about the thickness (diameter D) on both sides in the direction. From the viewpoint of efficiently receiving the flow of the fluid separated from the rotary main body 2, the position of the connecting portion 3B is preferably a position other than the projecting surface (the range from (b) to (d) in FIG. 8), more preferably , a position in front of the center of the cross section (x-axis) of the rotating body 2 in the rotation direction of the rotating body 2 (the range from FIG. 8B to FIG. 8C when rotating in the first rotating direction) other than the projecting surface. is. By setting the connection portion 3B at such a position, it is possible to efficiently generate a longitudinal vortex that serves as a driving force.

(Wake object: length of slope)
The length ls of the inclined portion 31 shown in FIG. 7 is not limited because the optimum value differs depending on the shape of the rotating body, the angle θ of the inclined portion, the rotation speed, etc. However, at least a part of the inclined portion constitutes the projecting surface. It is preferably equal to or longer than the length and equal to or shorter than the length from the connecting portion 3B to the intersection with the z-axis passing through the cross-sectional center of gravity of the rotating body 2 .

(Wake object: length of rear part)
Also, the length lb of the rear portion 32 shown in FIG. 7 is not limited because the optimum value differs depending on the shape of the rotating body, the position of the connecting portion 3B, the separation distance, etc., but at least the thickness of the rotating body 2 from the connecting portion 3B is It is preferable that the length is less than or equal to approximately twice (2D) (the diameter D if the rotating body 2 is a cylinder).

(Wake object: vortex adjustment part in the rear part)
As shown in FIG. 9 , the rear portion 32 of the trailing body 3 can be provided with a vortex adjusting portion 33 that is longer than the protruding surface width of the inclined portion 31 and does not protrude from the rotating body 2 . The vortex adjusting portion 33 has a length in the z-axis direction that is less than half the thickness of the rotating body 2 (the diameter D if the rotating body 2 is a cylinder), and is arranged on the front side of the rotating body 2 in the rotation direction. preferably. When a plurality of trailing bodies 3 are arranged on both sides of the rotation center of the rotating body 2, the vortex adjusting portions 33 are arranged at points symmetrical with respect to the rotation center 2c of the rotating body 2. As shown in FIG. By providing the vortex adjusting portion, the position where the longitudinal vortex is generated 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 and a rotation control function are incorporated in the rotation device, the vortex adjustment section can improve the stability in the rotation direction.

When the y-axis direction length of the rear portion 32 is 1, the vortex adjustment portion 33 preferably has a length of 1 or more on both sides of the width of the rear portion 32 . As a result, the trailing body 3 can be fixed to the rotating body 2 using the vortex adjustment portion while maintaining the effect of forming the pressure gradient by the trailing body 3 .

(Wake flow object: Width of protruded surface of inclined part and rear part)
The width of the projecting surface of the inclined portion 31 can be set to any length within the range from the center of rotation of the rotating body 2 to the end. By increasing the width of the projecting surface of the inclined portion, the flow rate of the fluid guided to the rear portion 32 increases, and the strength of the longitudinal vortex generated in the gap increases. However, the protruding surface of the inclined portion 31 acts as a resistance to the flow of the fluid, and the magnitude of the resistance is proportional to the area of the protruding surface. It is necessary to determine the upper limit of

The width of the rear portion 32 is preferably less than or equal to the width of the inclined portion 31 (FIG. 10). This has the effect of specifying and controlling the generation position of the longitudinal vortex.

A plurality of rear portions 32 may be arranged in the range from the rotation center to the end portion of the rotating body 2 . The plurality of rear portions 32 have the effect of increasing the number of locations where longitudinal vortices are generated (FIG. 11).

A plurality of rear portions 32 may be provided on one inclined portion 31 (FIG. 12). A plurality of rear portions may be provided with different protruding surfaces, respectively. This has the effect of inducing a plurality of vertical vortices and increasing the fluid force.

(Number of wake objects)
When a plurality of wake bodies are provided with the rotation center of the rotating body interposed therebetween, it is preferable that the plurality of wake bodies have a protruding surface of the inclined portion on the opposite side of the rotation center of the rotating body. That is, it is preferable that at least two inclined portions 31 are positioned at the leading edge of rotation when rotating in the first rotational direction, and at least two rear portions 32 are positioned at the leading edge of rotation when rotating in the second rotational direction. As shown in FIGS. 4 to 6 and 9 to 12, when a plurality of inclined portions 31 are linearly arranged along the longitudinal direction (y-axis) of the rotating body 2, the projecting surfaces of the inclined portions 31 are Although it is possible to rotate efficiently by arranging them at point-symmetrical positions with respect to the rotation center 2 c , a plurality of wakers 3 may be arranged at different distances from the rotation center of the rotating body 2 .

As described above, the present rotating device can provide a rotating device utilizing longitudinal vortices with improved performance such as the number of revolutions relative to the flow velocity and the power and torque associated with the rotation.

Hereinafter, a rotation device using longitudinal vortices according to the present invention will be specifically described.

A total of two trailing bodies were attached to a rotating body having a total length of 220 mm, which can rotate around a rotating shaft, one on each side of the rotating body with the center of rotation of the rotating body interposed therebetween. The rotary shaft was arranged at a position that equally divided the entire length of the rotary body. The width of the surface of the trailing body that receives the flow of the fluid was set to 30 mm equally at the inclined portion and the rear portion. In the trailing body, the surface receiving the flow of the fluid at the rear part is substantially perpendicular to the flow of the fluid, and the angle θ of the inclined part is 0 degrees (comparative example) or 20 degrees toward the upstream side in the flow direction of the fluid. (Example 1) and 40 degrees (Example 2) were used. A distance s1 between the rotating body and the rear part of the trailing object was set to 7 mm.

The rotation speed n, power coefficient Cp, and torque coefficient Cq with respect to the wind speed U were the values when the rotating device was installed in the wind tunnel test machine and the rotating main body was rotating at a constant speed (the measuring device is manufactured by Unipulse, UTMII-0 .2 Nm). The power coefficient Cp and the torque coefficient Cq were calculated by the 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 rotating 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.

As shown in FIG. 13, at a wind speed of 6 m/s, Example 1 was 1.6 times and Example 2 was 2.7 times that of Comparative Example. At a wind speed of 15 m/s, Example 1 was 1.8 times and Example 2 was 2.5 times that of Comparative Example.

FIG. 14 shows the results of measuring the relationship between the peripheral speed ratio and the power coefficient at a wind speed of 10 m/s. The maximum power coefficient is 0.003 (λ=0.12) in Comparative Example, 0.007 (λ=0.23) in Example 1, and 0.014 (λ=0.36) in Example 2. 2.1 times in Example 1 and 4.3 times in Example 2 as compared to Comparative Example.

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

According to the rotating device of the present invention, since the size is not particularly limited, it can be applied to all large, medium, small, and micro-sized wind turbines or water turbines, and can be used as a generator by providing a power generation motor.

REFERENCE SIGNS LIST 1 rotating shaft 2 rotating main body 3 trailing object 10 fluid flow direction 20 columnar body 21 support portion 30 flat plate 31 inclined portion 32 rear portion 33 vortex adjusting portion 100 rotating device 101, 103, 201 longitudinal vortex s1, s1' clearance s Separation distance

Claims (9)

a rotating shaft body that rotates about the flow direction of the fluid as a rotating shaft;
a rotating body arranged to rotate about the rotating shaft;
a rear portion spaced apart from the rotating body and disposed downstream in the flow direction of the fluid between the center of rotation of the rotating body and an end of the rotating body; and a side of the rotating body connected to the rear portion. a wake body comprising a ramp having a projecting surface that slopes downward. 2. The rotation according to claim 1, wherein the trailing body has the same rotation axis as that of the rotation body and rotates in synchronization with the rotation body within a rotation plane substantially parallel to the rotation plane of the rotation body. Device. 3. A rotating device according to claim 1 or 2, wherein the rear portion has a projecting surface. 4. The rotating device according to any one of claims 1 to 3, wherein the surface of the rear portion that receives the fluid is substantially perpendicular to the flow direction of the fluid. 4. The rotating device according to any one of claims 1 to 3, wherein the surface of the rear portion that receives the fluid is inclined toward the upstream side in the flow direction of the fluid. Assuming that the width of the protruding surface of the rear portion is 1, a length of 1 or more is added to each side of the rotating body in the longitudinal direction so that the portion where the rotating body intersects with the protruding surface of the rear portion does not overlap. 4. The rotating device of claim 3, comprising: 2. The rotating device according to claim 1, wherein the wake object is arranged with a separation distance from the rotating body that generates a longitudinal vortex that drives the rotating body in a rotational direction. 8. The rotating device according to claim 7, wherein the separation distance is variable. A plurality of wake objects are provided,
2. The rotating device according to claim 1, wherein the plurality of wake objects have a projecting surface of the inclined portion arranged on the opposite side of the center of rotation of the rotating body.

Images