JP2022134058A - Fluid rotary device and wind power generation device - Google Patents

Abstract

To suppress deterioration of performance due to vortices that occur at the blade tip of a rotor to hinder rotation, further reduce resistance of wind received when such a tabular end plate rotates, and furthermore increase an engine speed of the rotor by devising a wind collection structure.SOLUTION: A rotary device comprises a rotary shaft body substantially parallel to a flow direction of fluid, a rotor arranged so as to rotate around a rotation axis in a rotation surface that intersects substantially perpendicularly to the flow direction of fluid, and a ring-shaped body 2 that is a slipstream object, which are spaced apart from each other. The rotor has a plurality of rotary blades 1, and the blade tips thereof comprise an arcuate end plate 3 having a part of a curved surface of the circumference around which the blade tip rotates.SELECTED DRAWING: Figure 1a

Description

Patent Law Article 30, Paragraph 2 applied October 17, 2020 Announced at the 13th New ☆ Energy Contest January 18, 2021 5th Electronic Information Department Research Presentation and 30th Presented at the 2019 Electronics Science Research Conference

The present invention relates to a fluid rotating device and a wind turbine generator.

A first columnar body arranged so that its longitudinal direction intersects the fluid flow direction, and a second columnar body arranged so as to be spaced apart from the first columnar body and arranged so that its longitudinal direction intersects. and a columnar body. When the distance between the first columnar body and the second columnar body is a predetermined value with respect to the diameter of the first columnar body, the vicinity of the intersection of the first columnar body and the second columnar body A proposal has been made for a vibration power generator that utilizes a vertical vortex-excited vibration phenomenon in which vertical vortices are periodically generated from a vertical vortex (see Patent Document 1).

In investigating the properties of the longitudinal vortex-excited vibration phenomenon, not only is the longitudinal vortex formed periodically, but also when the first columnar body moves at a constant speed in one direction, the longitudinal vortex is generated only on one side, Based on the new knowledge of the generation of static lift, proposals have been made for a hydrodynamic power generation rotating device and a hydrodynamic power generation device that utilize longitudinal vortices as a driving force (see Patent Document 2). In addition, by using a cylinder as a rotary blade, it has a strong and robust airfoil.

As shown in FIG. 7a, a columnar rotating body and a flat plate behind it are installed so as to crisscross in the flow direction of the fluid. When the distance between the rotating body and the flat plate is a predetermined value with respect to the diameter of the rotating body, a vertical vortex excitation phenomenon occurs in which longitudinal vortices are periodically generated near the intersection of the rotating body and the flat plate as shown in FIG. 7b. . Longitudinal vortices repeat generation and disappearance unstably, and when the rotating body moves at a constant speed in one direction, the longitudinal vortex is generated only on one side and moves along with the rotation of the rotating body. As a result, the pressure in the direction of rotation of the rotating body is reduced, and a steady lift is generated on the rotating body, causing it to rotate.
Furthermore, for the purpose of suppressing performance deterioration due to tip vortices generated at the tip of a cylindrical rotor blade, the diameter of the end plate when a plate-shaped end plate is installed at the tip of the cylindrical rotor blade Investigations have been made on the effects on characteristics (see Non-Patent Document 1).

JP 2008-011669 A Patent No. 6378366

Shota Nakata, Kasumi Sakamoto, Hemsuwan Withhun, Tsutomu Takahashi, Influence of Blade Tip on Power Characteristics of Horizontal Axis Cylindrical Blade Wind Turbine Driven by Vertical Vortices, Proceedings of Solar/Wind Energy Conference, pp. 335-336 (2017)

A plate-shaped end plate like that in the conventional technology, which is attached to suppress the performance deterioration due to the vortex that is generated at the blade tip of the rotating body and hinders the rotation, suppresses the influence of the vortex, but the plate at the blade tip It receives wind resistance when rotating due to the shaped end plate.
Another object of the present invention is to reduce the wind resistance received when such plate-like end plates rotate, and to increase the number of revolutions of the rotating body by devising an air collection structure.

A fluid rotary device of the present invention comprises a rotating shaft substantially parallel to the flow direction of a fluid and arranged to rotate about the rotating shaft in a plane of rotation that intersects substantially perpendicularly to the flow direction of the fluid. and a ring-shaped body that is a trailing body, wherein the rotating body has a plurality of rotating blades, and the blade tips have a circumference around which the blade tips rotate. It has an arc-shaped end plate with a portion of the curved surface of

Further, the fluid rotating device of the present invention includes a rotating shaft body substantially parallel to the flow direction of the fluid, and a rotating shaft body that rotates around the rotating shaft in a rotation plane that intersects substantially perpendicularly to the flow direction of the fluid. It is a rotating device that includes a rotating body and a ring-shaped body that is a trailing body separated from each other, and is a cylindrical diffuser (wind lens) is provided so as to surround the outer circumference of the rotating body.

According to the fluid rotating device of the present invention, the end plate at the next end of the rotating body is formed in an arc shape or a ring shape, thereby suppressing the blade tip vortex generated at the blade tip. The resistance when the rotating body rotates is reduced, and the number of revolutions can be increased. In addition, by providing a cylindrical diffuser (wind lens (wind collecting structure fluid)) formed so that the opening area expands from the fluid inlet to the outlet so as to surround the outer periphery of the rotating body, a vortex such as Karman vortex can be generated. is formed in the back, and the flow velocity can be further increased by lowering the pressure near the outlet of the wind collecting structure and using the pressure difference.

It is a front photograph showing the first embodiment of the present invention. It is a side view photograph showing the first embodiment of the present invention. 1 is a perspective photograph showing a first embodiment of the present invention; 1 is a schematic front view of an arc-shaped end plate type cylindrical rotating body according to a first embodiment of the present invention; FIG. It is a front photograph which shows the 2nd Example of this invention. It is a side view photograph showing a second embodiment of the present invention. FIG. 11 is a perspective photograph showing a second embodiment of the present invention; FIG. FIG. 6 is a schematic front view of a ring-shaped end plate type cylindrical rotating body according to a second embodiment of the present invention; It is a front photograph which shows the 4th Example 1 of this invention. It is a side view photograph showing the fourth embodiment 1 of the present invention. It is a perspective photograph showing the fourth embodiment 1 of the present invention. It is a front photograph which shows the 4th Example 2 of this invention. It is a side view photograph showing the fourth embodiment 2 of the present invention. It is a perspective photograph showing a fourth embodiment 2 of the present invention. It is a front photograph which shows the 3rd Example of this invention. It is a side view photograph showing a third embodiment of the present invention. FIG. 11 is a perspective photograph showing a third embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view of a horizontal plane passing through the center of the rotating body on which the wind lens is installed; It is a cross-sectional view of a horizontal plane passing through the center of the rotating body on which the wind lens is installed, and is a view in which the width of the wind lens is extended upwind. FIG. 4 is a schematic side view showing the principle of longitudinal vortex-excited vibration generation; It is a model perspective view same as the above. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed increase of the 1st Example of this invention. Same as above, it is a graph. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed fall of the 1st Example of this invention. Same as above, it is a graph. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed increase of the 2nd Example of this invention. Same as above, it is a graph. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed fall of the 2nd Example of this invention. Same as above, it is a graph. It is the graph which showed the relationship of the wind speed and rotation speed at the time of the wind speed increase of 1st Example and 2nd Example of this invention. It is the graph which showed the relationship of the wind speed and rotation speed at the time of the wind speed fall of 1st Example and 2nd Example of this invention. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed increase of the 3rd Example of this invention. Same as above, it is a graph. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed fall of the 3rd Example of this invention. Same as above, it is a graph. FIG. 10 is a table showing the relationship between the wind speed, the number of revolutions, and the rate of increase in revolutions when the wind speed increases in the fourth embodiment 1 of the present invention; FIG. Same as above, it is a graph. FIG. 10 is a table showing the relationship between the wind speed, the number of revolutions, and the rate of increase in revolutions when the wind speed is decreasing according to the fourth embodiment 1 of the present invention; FIG. Same as above, it is a graph. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed increase of the 4th Example 2 of this invention. Same as above, it is a graph. It is a table|surface which shows the relationship between the wind speed, rotation speed, and rotation increase rate at the time of a wind speed fall of the 4th Example 2 of this invention. Same as above, it is a graph. It is a graph which shows the relationship of the wind speed at the time of the wind speed increase of the arc-shaped end plate type|mold columnar rotor of 4th Example 1 of this invention, and the ring-shaped end plate type|mold columnar rotor of 4th Example 2 of this invention. FIG. 10 is a graph showing the relationship between the wind speeds of the arc-shaped end plate type cylindrical rotor of the fourth embodiment 1 and the ring-shaped end plate type cylindrical rotor of the fourth embodiment 2 of the present invention when the wind speed is decreasing.

<First embodiment>
A first embodiment of the invention is shown in FIGS. 1a, 1b and 1c. The direction from front to back in FIG. 1a is the flow direction of the fluid, and there is a rotating shaft substantially parallel to this flow direction. A rotating body is arranged so as to rotate around a rotating shaft within a plane of rotation that intersects substantially perpendicularly to the direction of flow. In FIG. 1a, four cylindrical blades are arranged at 90° intervals from the center of rotation. The blades have substantially the same length, and one end thereof is connected to the center of rotation of the rotating body, and the other end of the blade (hereinafter referred to as the "wing tip" in the present invention) is provided with an end plate. ing. Further, a ring-shaped body, which is a trailing body, is arranged on the downstream side in the flow direction with respect to the rotating body.

The present invention is an arc-shaped end plate-type columnar rotor provided with an arc-shaped end plate at the blade tip of the rotor, the curved surface of which is substantially the same as the circular arc of the locus of rotation of the blade tip of the rotor. This is a fluid rotating device characterized in that a rotating body called is attached.

A plate-shaped end plate, which is installed in the conventional technology to suppress performance degradation due to vortices that hinder rotation generated at the blade tip of the rotating body, suppresses the influence of the vortex, but the plate-shaped end plate at the blade tip The wind resistance is received when rotating due to the end plate of However, by equipping the blade tip of the rotor of the present invention with an arc-shaped end plate having a curved surface that is substantially the same as the circular arc of the trajectory when the blade tip of the rotor rotates, the blade tip can be By suppressing the generated vortices and having a curved surface that is almost the same as the circular arc of the trajectory when the blade tip rotates, it has the effect of reducing the wind resistance received during rotation.

In order to measure the performance characteristics of the rotating body with such arc-shaped end plates, a comparison experiment was conducted with a cylindrical rotating body with nothing attached to the tip of the blade. A wind tunnel was used for the experiment, and experiments were conducted when the wind speed was increased from 1 m/s to 10 m/s and when the wind speed was decreased from 10 m/s to 1 m/s. We compared the difference and the wind speed when the wind turbine was stopped. In this experiment, the wing of the rotating body uses a cylindrical wing. Also, the wake object is arranged behind the rotating body.

Figures 8a and 8b show the number of rotations and rate of increase in rotation when the wind speed increases. From this result, the rotation increase rate increased to 3.6% at a wind speed of 9 m/s, but decreased to -2.9% at a wind speed of 10 m/s. However, when comparing the wind speed when the rotating body starts to rotate, the cylindrical rotating body starts rotating at a wind speed of 8 m/s, and the circular end plate type cylindrical rotating body starts rotating at a wind speed of 6 m/s. It can be seen that the starting torque is smaller for the plate-type columnar rotating body.

Figures 9a and 9b show the rotation speed and the rate of increase in rotation when the wind speed is decreasing. As a result, at wind speeds of 5 m/s and 6 m/s, the rotational speed of the arc-shaped end plate type cylindrical rotor is higher than that of the cylindrical rotor. was there. However, when comparing the wind speed when the rotating body stops, the cylindrical rotating body stops at a wind speed of 5 m/s, but the circular end plate type cylindrical rotating body stops at a wind speed of 4 m/s. It can be seen that the arc-shaped end plate type columnar rotating body rotates at a lower wind speed.

<Second embodiment>
A second embodiment is shown in Figures 2a, 2b and 2c. In the second embodiment, the end plate is a ring-shaped end plate (ring-shaped end plate). A ring-shaped end plate is joined to the blade tip of the rotating body. A rotating body using a conventional plate-shaped end plate or a rotating body using an arc-shaped end plate as in the first embodiment receives wind resistance when rotating because there is a certain interval between the end plates. end up However, in the second embodiment, since the end plates are ring-shaped, there is no space between the end plates, and resistance during rotation is less likely to be received. can increase the number of revolutions of the fluid rotating device.

In order to measure the performance characteristics of the cylindrical rotor provided with the ring-shaped end plate, a comparison experiment with a cylindrical rotor with nothing attached to the tip of the blade was conducted in the same manner as in the first embodiment.

Figures 10a and 10b show the number of rotations and rate of increase in rotation when the wind speed increases. At wind speeds of 8 m/s and 9 m/s, the rate of increase in rotation increased by 10% or more, and even at a wind speed of 10 m/s, it increased by 5.9%, and the increase occurred at all wind speeds where the rotating body was rotating. . Furthermore, the cylindrical rotating body starts rotating at a wind speed of 8 m/s, while the ring-shaped end plate type cylindrical rotating body starts rotating at a wind speed of 6 m/s. It can be seen that the columnar rotating body has a smaller starting torque.

FIG. 11a and FIG. 11b show the number of rotations and rate of increase in rotation when the wind speed is decreasing. When the wind speed is decreasing, the rotating body rotates in the same manner as when the wind speed is increasing. The result was an increase of .8%. Comparing the wind speed when the rotating body stops, the cylindrical rotating body has a wind speed of 5 m/s, while the ring-shaped end plate type cylindrical rotating body stops at a wind speed of 4 m/s. It can be seen that the end plate type columnar rotating body rotates at a lower wind speed.

12a and 12b show a comparison of the rotational speeds of Examples 1 and 2. FIG. FIG. 12a shows the number of revolutions when the wind speed increases, and FIG. 12b shows the number of revolutions when the wind speed decreases.

<Third embodiment>
FIGS. 5a, 5b, and 5c show a rotating shaft substantially parallel to the flow direction of the fluid, and a rotating shaft rotating about the rotating shaft in a plane of rotation that intersects substantially perpendicularly to the flow direction of the fluid. This is an embodiment in which a wind lens is further arranged in a rotating device provided with a rotating body and a ring-shaped body, which is a trailing body, spaced apart from each other.

Furthermore, the present invention can attach a cylindrical diffuser (commonly known as a wind lens) formed so that the opening area expands from the inlet of the fluid (wind) toward the outlet so as to surround the outer periphery of the rotating body. 3 and 4 are photographs of examples. FIG. 6a is a cross-sectional view in a horizontal plane through the center of the rotating body. Although the cross section of the wind lens is fan-shaped in FIG. 6a, it is not necessarily limited to this. It is sufficient if it is formed so that the opening area expands from the inlet toward the outlet.
In the wind lens (cylindrical diffuser), the surface from which the wind enters (windward side) is the front surface, and the surface from which the wind exits (leeward surface) is the rear surface (see Fig. 6a). Similarly, the front and rear surfaces of the body of revolution are defined.
In the embodiment of FIG. 6a, the front surface of the wind lens and the front surface of the rotor and the front surface of the wind lens and the rear surface of the rotor are respectively located at the same position with respect to the flow direction of the fluid. That is, in FIG. 6a, the width of the wind lens (width in the direction of fluid flow) has the same width as the width of the rotating body (width in the direction of fluid flow).

As shown in FIG. 6a, the rear surface of the wind lens is preferably at the same position or more upwind than the rear surface of the rotating body with respect to the fluid flow direction. If the rear surface of the wind lens is located behind the rear surface of the rotating body, the vertical vortex generated between the cylinder and the trailing object becomes weaker, which is undesirable because the rotational lift becomes smaller. On the other hand, as in FIG. 6b, the front surface of the wind lens does not necessarily have to be the same as the front surface of the rotor with respect to the flow direction of the fluid. The front surface of the wind lens may be on the windward side with respect to the front surface of the rotor. If it is placed on the windward side, a more rectifying effect can be expected.

When the wind lens is installed as shown in Fig. 6a and the ring-shaped end plate type cylindrical rotating body is used, the number of rotations and the wind lens when moving forward 5 mm in the flow direction of the fluid and with respect to the flow direction A comparison is made of the number of revolutions when retreating 5 mm backward, and the power characteristics depending on the position of the wind lens are examined. The experiment was conducted in the same manner as in Example 1 when the wind speed was increased from 1 m/s to 10 m/s and when the wind speed was decreased from 10 m/s to 1 m/s.

Figures 13a and 13b show the number of rotations and rate of increase in rotation when the wind speed increases. Comparing the case where the wind lens is installed at the position shown in FIG. 6a and the case where the wind lens is advanced 5 mm in the flow direction of the fluid, it can be seen that the rotation start wind speed is lower in FIG. 6a and hinders the generation of rotation torque. Also, it starts to rotate at a wind speed of 7 m/s, but the number of revolutions is greatly reduced. Also, when the position of the wind lens is retreated by 5 mm in the flow direction of the fluid, the number of revolutions decreases by about -20% even though the wind speed at which the wind starts to rotate remains the same.

Figures 14a and 14b show the number of rotations and rate of increase in rotation when the wind speed is decreasing. The number of revolutions when the wind lens advances 5 mm in the flow direction of the fluid is reduced by about 20% at all times when the rotating body rotates, compared to when it is installed at the position shown in FIG. 6a. When the wind speed at which the rotating body stops is compared, it stops at a wind speed of 3 m/s when moved forward by 5 mm, and rotates at a lower wind speed when installed at the position shown in FIG. 6a. When the position of the wind lens was retreated 5 mm in the flow direction of the fluid, the rotation speed decreased at all times when the rotating body was rotating, and the rotation speed decreased significantly by 80% or more at wind speeds of 8 m/s to 10 m/s. Also, it can be seen that the wind speed at which the rotating body stops is as low as 4 m/s, and the rotating body cannot rotate.

From the above experimental results, the position of the wind lens is suitable when the wind lens is placed so that it overlaps the rotating body when viewed from the side as shown in FIG. 6a.

<Fourth Embodiment 1>
A fourth embodiment is shown in Figures 3a, 3b and 3c. A fourth embodiment 1 is a fluid rotation device characterized by providing a wind lens in the first embodiment.

Figures 15a and 15b show the number of rotations and rate of increase in rotation when the wind speed increases. When the wind lens is installed, the number of revolutions of the arcuate end plate type columnar rotating body increases from 7 m/s at which the rotating body rotates to 10 m/s. However, when the wind lens was installed, the rotation starting wind speed resulted in a larger starting torque.

Figures 16a and 16b show the number of rotations and rate of increase in rotation when the wind speed is decreasing. The number of revolutions when the wind speed decreased increased by 10% or more when the rotating body was rotating, and the number of revolutions increased by 20% or more at a wind speed of 8 m/s. In addition, when the wind lens is installed, the wind speed stops at 2 m/s, but when the wind lens is not installed, the wind speed stops at 3 m/s. rotates at

<Fourth Embodiment 2>
A fourth embodiment 2 is shown in FIGS. 4a, 4b and 4c. A fourth embodiment 2 is a fluid rotating device characterized by providing a wind lens in the second embodiment.

Figures 17a and 17b show the number of rotations and rate of increase in rotation when the wind speed increases. At a wind speed of 6 m/s, at which the ring-shaped end plate type columnar rotating body is rotating when the wind lens is installed, the wind speed increases by 15% or more, and the number of rotations also increases at higher wind speeds.

FIG. 18a and FIG. 18b show the number of rotations and rate of increase in rotation when the wind speed is decreasing. When the ring-shaped end plate type cylindrical rotating body is rotating when the wind lens is installed, the number of revolutions increases by more than 5%. Further, when the lens is installed, the wind speed is 2 m/s and the wind speed is stopped, and compared to when the wind lens is not installed, the wind speed rotates at a low wind speed as in the first embodiment.

19a and 19b show a comparison of the number of rotations of the arc-shaped end plate type cylindrical rotating body and the ring-shaped end plate type cylindrical rotating body. FIG. 19a shows the number of revolutions when the wind speed increases, and FIG. 19b shows the number of revolutions when the wind speed decreases.

From the results of the fourth embodiment 1 and the fourth embodiment 2 described above, by installing the wind lens, the rotational speed is increased and the wind speed is low.

<Fifth embodiment>
A wind power generator using the rotating device according to Examples 1 to 4.
By providing a generator in the rotating body of the rotating device according to Embodiments 1 to 4, the rotating device can be utilized as a wind turbine generator. Any known generator such as a DC brushless motor can be used as the generator. Compared to conventional propeller-type wind turbines, it is possible to provide a highly safe and robust rotating device that reduces the risk of injury. In the experimental data of this embodiment, a rotating device with a rotating body having a diameter of about 30 cm was used as a prototype. It is about 80 cm. It should be noted that the present invention is not limited to such an embodiment, and can be applied to a larger power generator.

1 Rotary blade 2 Ring-shaped body 3 Arc-shaped end plate 4 Rotating shaft 5 Arc-shaped end plate-type columnar rotor 6 Ring-shaped end plate 7 Ring-shaped end plate-type columnar rotor 8 Wind lens 9 Unspecified rotor 10 Wind lens cross section 11 Rotating body 12 Wind lens front surface 13 Wind lens rear surface 14 Rotating body front surface 15 Rotating body rear surface 16 Fluid and fluid flow direction 17 Cylindrical rotating body 18 Plate and ring-shaped body 19 Longitudinal vortex 20 Rotation direction

A fluid rotary device of the present invention comprises a rotating shaft substantially parallel to the flow direction of a fluid and arranged to rotate about the rotating shaft in a plane of rotation that intersects substantially perpendicularly to the flow direction of the fluid. A fluid rotating device comprising a columnar rotating body and a ring-shaped body as a trailing body separated from each other, and using a longitudinal vortex generated between the rotating body and the trailing body as a driving force , The rotating body includes a plurality of rotating blades, and an arc-shaped end plate having a part of the curved surface of the circumference around which the blade tip rotates is provided at the blade tip, and the arc-shaped end plate extends substantially in the flow direction of the fluid. arranged in parallel.

Further, the fluid rotary device of the present invention is provided with a ring-shaped end plate along the circumferential surface around which each blade tip rotates instead of the arc-shaped end plate, and the arc-shaped end plate extends substantially in the fluid flow direction. arranged in parallel.

Claims (6)

a rotating shaft substantially parallel to the flow direction of the fluid; a rotating body arranged to rotate about the rotating shaft in a plane of rotation that intersects substantially perpendicularly to the flow direction of the fluid; In a rotating device provided with spaced ring-shaped bodies as objects,
A fluid rotating device, wherein the rotating body comprises a plurality of rotating blades, and an arc-shaped end plate having a part of a curved surface of a circumference on which the blade tips rotate. 2. A fluid rotary device according to claim 1, further comprising a ring-shaped end plate along the circumferential surface around which each blade tip rotates instead of the arc-shaped end plate. 3. Each of claims 1 and 2, characterized in that a cylindrical diffuser (wind lens) formed so as to increase the opening area from the inlet of the fluid toward the outlet is provided so as to surround the outer periphery of the rotating body. Fluid rotating device. a rotating shaft substantially parallel to the flow direction of the fluid; a rotating body arranged to rotate about the rotating shaft in a plane of rotation that intersects substantially perpendicularly to the flow direction of the fluid; In a rotating device provided with spaced ring-shaped bodies as objects,
1. A fluid rotating device, characterized in that a cylindrical diffuser (wind lens) formed so that the opening area expands from the fluid inlet toward the fluid outlet is provided so as to surround the outer circumference of the rotating body. 5. A fluid rotary device according to claim 3, wherein the rear surface of said cylindrical diffuser is located at the same level as or upstream of said rear surface of said rotor in the direction of fluid flow. A wind turbine generator using the fluid rotating device according to any one of claims 1 to 5.

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