JP5618350B2 - Flow field control device and flow field control method - Google Patents

Description

  The present invention relates to a flow field control device and a flow field control method for deflecting a fluid flow direction in a flow field.

Generally, ships have a water intake for collecting engine cooling water, but if air bubbles contained in the water flow are taken in from this water intake, the cooling effect of the engine will be reduced. There is one that prevents suction (Patent Document 1).
In patent document 1, many protrusion parts are provided in the outer periphery front edge part of the water intake. Then, the bubbles contained in the water flow are confined in the vortex generated in the protrusion, so that the bubbles flow away downstream without flowing into the water intake.
Moreover, since propeller efficiency will fall if a bubble is caught in the propeller provided in the stern, there exists a thing which provides the protruding part which prevents bubble entrainment in the ship bottom (patent document 2).

In Patent Document 2, as the raised portion, the front is slightly lower and the rear is raised, and a V-shaped mound that continues gently is provided on the bottom of the ship. The bubbles that have reached the V-shaped mound are moved away from the bottom of the ship by the V-shaped mound and are caused to wrap around the ship side, thereby preventing the bubbles from reaching the propeller.
As described above, the large number of protrusions in Patent Document 1 and the V-shaped mound in Patent Document 2 keep the bubbles away from the hull surface and guide them along their shapes.

JP 2009-40271 A JP 2009-248831 A

  However, the method of moving the air bubbles away from the hull may not be sufficient depending on the environment during actual navigation such as in the waves. The height dimension becomes large. Further, a raised portion is required over the entire main part of the ship bottom in order to cause the bubbles to go around to the ship side. And it is not preferable to add a large and long projecting portion or a protruding portion to the ship bottom or the ship side because it becomes an obstacle not only when entering the dock but also when navigating.

  Therefore, the present invention can reduce the projecting dimension by deflecting the flow direction of the bubbles rather than keeping the bubbles away from the hull, and can prevent the inflow of bubbles to the intake for collecting engine cooling water, for example. An object is to provide a field control device and a flow field control method.

In the flow field control device corresponding to claim 1, a mounting surface for mounting on a flow field control object and / or a flow field control object related object, an apex facing the upstream side of the fluid, and a downstream side of the fluid And a flow deflecting portion that increases the thickness in the direction of deflecting the flow of the fluid and is formed in a substantially triangular pyramid, and the attachment surface extends from the apex to the downstream side than the first ridge line and the first ridge line It is composed of a long second ridgeline, a third ridgeline connecting the downstream end of the first ridgeline and the downstream end of the second ridgeline, and the downstream end of the first ridgeline has the maximum thickness. The inner angle formed by the second ridge line and the third ridge line is an acute angle, and is installed in the flow field to deflect the fluid flow. According to the first aspect of the present invention, the flow direction of the fluid in the flow field can be arbitrarily deflected. In addition, the second ridge line is made longer than the first ridge line, and the inner angle formed by the second ridge line and the third ridge line of the mounting surface on the most downstream side of the substantially triangular pyramid is set to be an acute angle. The deflection effect can be reliably increased.
According to a second aspect of the invention, in the flow field control apparatus according to claim 1, characterized in that radiused to at least one corner portion constituting a substantially triangular pyramid. According to the second aspect of the present invention, the fluid resistance can be reduced by rounding the corners.
According to a third aspect of the present invention, in the flow field control device according to the first or second aspect , at least one of the planes constituting the substantially triangular pyramid is formed of a curved surface. According to the third aspect of the present invention, it is possible to follow the streamline by making the plane a curved surface, and the fluid resistance can be reduced.
According to a fourth aspect of the present invention, in the flow field control device according to the first or second aspect , the ridgeline and the plane constituting the substantially triangular pyramid are formed so as to be along the streamline of the fluid flow. It is characterized by. According to the fourth aspect of the present invention, the fluid resistance can be reduced by forming the ridgeline and the plane so as to be along the streamline of the fluid flow.
According to a fifth aspect of the present invention, there is provided the flow field control device according to any one of the first to fourth aspects, wherein two substantially triangular pyramids are provided so that a fluid flow opens upstream of the flow field control object. Are arranged symmetrically. According to the present invention described in claim 5 , it is possible to induce the flow of fluid, for example, to prevent bubbles from being mixed into a flow field control object such as a water intake for collecting engine cooling water provided in a hull. It can be carried out.
In the flow field control method corresponding to claim 6, the flow direction of the fluid in the flow field is controlled by arranging a plurality of flow field control devices according to any one of claims 1 to 4. Features. According to the sixth aspect of the present invention, the fluid flow can be deflected in a plurality of directions by using a plurality of flow field control devices.
According to a seventh aspect of the present invention, in the flow field control method according to the sixth aspect , a plurality of flow field control devices are sequentially arranged from the upstream side to the downstream side of the fluid to induce the flow of the fluid. And According to the seventh aspect of the present invention, the flow of fluid flowing from the upstream to the downstream can be deflected in a plurality of directions or regulated to flow in one direction.
The present invention according to claim 8 is the flow field control method according to claim 6 or claim 7 , wherein the flow field is a flow mixed with bubbles, and the flow of bubbles is induced by a plurality of flow field control devices. It is characterized by. According to the present invention described in claim 8 , by inducing the flow of bubbles, it is possible to keep the bubbles away from the flow field control object or to collect the bubbles in the flow field control object.
In the flow field control method corresponding to claim 9, the flow field control device according to any one of claims 1 to 4 is disposed with a predetermined angle with respect to the fluid flow. Features. According to the ninth aspect of the present invention, even if the flow field control device has a fixed shape, the deflection effect can be varied by arranging the flow field control device at an angle with respect to the fluid flow.

According to the flow field control device of the present invention, the flow direction of the fluid in the flow field can be arbitrarily deflected. In addition, the second ridge line is made longer than the first ridge line, and the inner angle formed by the second ridge line and the third ridge line of the mounting surface on the most downstream side of the substantially triangular pyramid is set to be an acute angle. The deflection effect can be reliably increased.
Further, when the corners constituting the substantially triangular pyramid are rounded, fluid resistance can be reduced, and for example, cavitation and corner wear can be prevented.
In addition, when the plane constituting the substantially triangular pyramid is a curved surface, it can be along the streamline, and the fluid resistance can be reduced. For example, when the mounting surface is a curved surface, the curved surface is matched with this curved surface. It becomes possible.
In addition, when the ridgeline and the plane constituting the substantially triangular pyramid are formed along the streamline of the fluid flow, the fluid resistance can be reduced.
In addition, when two substantially triangular pyramids are symmetrically arranged on the upstream side of the flow field control object so as to open the fluid flow, the fluid flow can be induced, for example, the engine cooling provided in the hull It is possible to prevent air bubbles from being mixed into a flow field control target object such as a water sampling water intake.
Further, according to the flow field control method of the present invention, the flow of the fluid can be deflected in a plurality of directions by controlling the flow direction of the fluid in the flow field by arranging a plurality of flow field control devices. .
Further, when a plurality of flow field control devices are sequentially arranged from the upstream side to the downstream side of the fluid to induce the flow of the fluid, the flow of the fluid flowing from the upstream to the downstream is deflected in a plurality of directions. It can be restricted to flow in the direction.
Further, when the flow of bubbles is guided by a plurality of flow field control devices, the bubbles can be kept away from the flow field control object or the bubbles can be collected on the flow field control object.
Further, according to the flow field control method of the present invention, the flow field control device is arranged at a predetermined angle with respect to the flow of the fluid, so that even if the flow field control device has a fixed shape, it is deflected. The effect can be different.

The perspective view of the flow field control apparatus by the 1st Embodiment of this invention 1. A direction arrow view of FIG. B direction arrow view of FIG. C direction arrow view of FIG. Explanatory drawing showing the flow of fluid in the same flow field control device The side view of the ship provided with the flow field control apparatus by the 2nd Embodiment of this invention The bottom view of the ship provided with the flow field control apparatus by the 3rd Embodiment of this invention The perspective view which shows the state which provided the flow field control apparatus by 2nd Embodiment in the water intake for ships The perspective view of the flow field control apparatus by 2nd Embodiment of a different direction from FIG. The perspective view of the principal part of the flow field control apparatus by 2nd Embodiment of a different direction from FIG. The perspective view which shows the state which provided the flow field control apparatus by 3rd Embodiment in the water intake for ship bottoms Explanatory drawing which shows the state which provided the flow field control apparatus by the 4th Embodiment of this invention in the ship side of the hull Explanatory drawing which shows the state which provided the flow field control apparatus by the 5th Embodiment of this invention in the ship's bottom

The flow field control device according to the first embodiment of the present invention will be described below.
1 is a perspective view of a flow field control device according to the present embodiment, FIG. 2 is a view in the direction of arrow A in FIG. 1, FIG. 3 is a view in direction of arrow B in FIG. 1, and FIG. It is.
In the flow field control apparatus according to the present embodiment, two substantially triangular pyramids 10 are arranged symmetrically. Note that the flow field control device can be configured by one substantially triangular pyramid 10.

The substantially triangular pyramid 10 is attached to the flow field control target object or the flow field control target related object, the apex 12 facing the upstream side of the fluid, and arranged on the downstream side of the fluid to flow the fluid. And a flow deflector 13 that increases the thickness in the direction of deflection.
The attachment surface 11 connects the first ridge line 14a and the second ridge line 14b extending downstream from the vertex 12, and the downstream end of the first ridge line 14a and the downstream end of the second ridge line 14b. 3 ridge lines 14c.
The deflecting surface 15 connects the fourth ridge line 14d and the second ridge line 14b extending downstream from the vertex 12, and the downstream end of the fourth ridge line 14d and the downstream end of the second ridge line 14b. 5 ridgelines 14e.
The bottom surface 16 includes a third ridge line 14c, a fifth ridge line 14e, and a sixth ridge line 14f that connects the downstream end of the first ridge line 14a and the downstream end of the fourth ridge line 14d. ing.
The side surface 17 includes a first ridge line 14a, a fourth ridge line 14d, and a sixth ridge line 14f.

The flow deflection unit 13 includes a deflection surface 15, a bottom surface 16, and a side surface 17. The flow deflection unit 13 and the attachment surface 11 form a substantially triangular pyramid 10, and the substantially triangular pyramid 10 is apex on the upstream side of the fluid. The flow field control device is configured by facing 12.
The downstream end of the first ridge line 14a (fourth ridge line 14d) has a maximum thickness with respect to the mounting surface 11, and the length of the sixth ridge line 14f is the maximum thickness.
The inner angle a formed by the second ridge line 14b and the third ridge line 14c (fifth ridge line 14e) is an acute angle.
The inner angle a can be a right angle or an obtuse angle depending on the application, but if it is configured with an acute angle, the effect of changing the flow is greater. In addition, although the angle which the 1st ridgeline 14a and the 6th ridgeline 14f comprise, and the angle which the 3rd ridgeline 14c and the 6th ridgeline 14f comprise is a right angle in this embodiment, it is arbitrary according to a use. The angle can be selected. When the angle formed by the first ridge line 14a and the sixth ridge line 14f is an obtuse angle, the flow after deflection may be made closer to the direction of the flow field control object to which the attachment surface 11 is attached or the flow field control object related object. If it is an acute angle, it can be kept away. When the angle formed by the third ridge line 14c and the sixth ridge line 14f is an obtuse angle, the flow deflection can be further increased, and when the angle is an acute angle, the flow deflection can be suppressed.

FIG. 5 is an explanatory diagram showing the flow of fluid in the flow field control device.
FIG. 5 shows a case where the flow field control device is installed with the water inlet opening 20 as a flow field control target.
As shown in the figure, two substantially triangular pyramids 10 are symmetrically arranged on the upstream side of the water inlet opening 20 so that the flow of fluid opens. The substantially triangular pyramid 10 has the apex 12 facing the upstream side of the fluid, the extended line of the second ridge line 14b bisects the water inlet opening 20, and the first ridge line 14a (fourth ridge line 14d) The extension line is arranged so as not to pass through the water inlet opening 20. Further, the length b between the sixth ridge lines 14 f of the two substantially triangular pyramids 10 is larger than the height dimension h of the water inlet opening 20.
As indicated by the arrows in the figure, the fluid is deflected to flow along the first ridge line 14a (fourth ridge line 14d) from the apex 12 toward the water inlet opening 20, and It flows to pass the side. Then, when bubbles are mixed in the flow field, the bubbles become a flow indicated by arrows in the figure together with the fluid, so that the bubbles do not enter the water inlet opening 20.
Further, the two substantially triangular pyramids 10 are arranged symmetrically so that the fluid flow is opened, so that even if the fluid inflow direction fluctuates, the fluid flow is induced and the flow deflection effect is impaired. Is done.

Hereinafter, an embodiment in which the flow field control device of the present invention is applied to a water intake for collecting engine cooling water of a ship will be described.
FIG. 6 is a side view of a ship provided with a flow field control device according to the second embodiment of the present invention, and FIG. 7 is a bottom view of the ship provided with a flow field control device according to a third embodiment of the present invention.
As shown in the figure, at the rear of the hull of the ship 30, there is a ship-side intake 21 provided on the side of the ship below the draft line and a ship-bottom intake 22 provided on the bottom of the ship.

8 to 10 are perspective views of the flow field control device according to the second embodiment provided at the water intake for the ship.
In the present embodiment, a case is shown in which the flow field control device is installed on the hull with the water intake 21 for the ship side as the flow field control target and the hull as the flow field control target related object.
In the flow field control device according to the present embodiment, two substantially triangular pyramids 10 are symmetrically arranged on the upstream side of the ship-side water intake 21 so that the fluid flow opens. The two substantially triangular pyramids 10 are spaced apart by a predetermined dimension. The space between the substantially triangular pyramids 10 depends on the flow velocity and the flow vector, but if it is within a certain size, the deflection effect on the fluid flow does not drop. The substantially triangular pyramid 10 has the apex 12 facing the bow side that is the upstream side of the fluid, the extension line of the second ridge line 14b is located at the intermediate height of the water intake 21 for the ship side, and the first ridge line 14a (first 4 ridge lines 14d) are arranged so as not to pass through the ship-side water intake 21. The length b between the sixth ridge lines 14 f of the two substantially triangular pyramids 10 is larger than the height dimension h of the ship-side water intake 21.

A reinforcing portion 20a is formed at the periphery of the opening of the ship-side water intake 21, and the substantially triangular pyramid 10 is provided at a position where the downstream end of the second ridge line 14b substantially contacts the reinforcing portion 20a. The water flow is deflected to flow along the first ridge line 14a (fourth ridge line 14d) from the apex 12 toward the ship side water intake 21 so as to pass through the side of the ship side water intake 21. Flowing. When air bubbles are mixed in the flow field, the air bubbles are prevented from entering the ship side water intake 21 due to the deflection effect of the flow.
Further, a space 20b wider than the ship-side intake 21 is formed in the hull of the ship-side intake 21, and a gas vent hole 20c communicating with the space 20b is provided above the ship-side intake 21. On the upstream side of the gas vent hole 20c, a protrusion 40 having a width wider than the height direction dimension of the gas vent hole 20c is provided. In the unlikely event that the flow field control device according to the present embodiment is unavoidable, the gas that has entered through the ship-side water intake 21 gathers above the space 20b, and the flow is accelerated by the triangular pyramid-shaped protrusions 40. The gas vent hole 20c is led out of the hull by reducing the pressure.

As shown in FIG. 8, the flow field control device according to the present embodiment is arranged with a predetermined angle c with respect to the fluid flow indicated by the arrow.
In the ship-side water intake 21 shown in FIG. 6, a slightly upward flow is generated from the bow side toward the stern side. In the present embodiment, by arranging with a predetermined angle c, it is possible to match the direction of the streamline slightly upward from the bow side toward the stern side.
As described above, by arranging the liquid flow at a predetermined angle, a predetermined deflection can be obtained even when, for example, a ready-made substantially triangular pyramid is used. In other words, when the deflection is not sufficient because the shape of the substantially triangular pyramid is determined, it is possible to have a predetermined flow deflection effect by arranging it at a predetermined angle with respect to the fluid flow. On the other hand, if the deflection is excessive, the predetermined deflection can be obtained by adjusting the angle with respect to the streamline direction.

In particular, as shown in FIG. 9, in the flow field control apparatus according to the present embodiment, the third ridge line 14c is configured by a curve along the hull.
In particular, as shown in FIG. 10, in the flow field control device according to the present embodiment, the first ridge line 14 a is configured by a curve along the hull.
In the flow field control device according to the present embodiment, the second ridge line 14b is also configured by a curve along the hull, and the mounting surface 11 is configured by a curved surface along the hull. Therefore, even if the mounting surface 11 is a hull having a curved surface, it can be arranged in accordance with the curved surface.

The substantially triangular pyramid 10 is configured by combining steel plates, is welded to the hull, and has the same coating as the hull. Also from the viewpoint of welding, as shown in FIG. 10, it is preferable that the apex 12 is slightly rounded.
Further, when the apex 12 is rounded, the fluid resistance can be reduced, and the occurrence of cavitation due to the sharp end and the wear of the corner itself can be prevented.
In addition, the fluid resistance can be reduced by configuring the fourth ridge line 14d, the fifth ridge line 14e, and the sixth ridge line 14f with curves, and configuring the deflection surface 15 and the side surface 17 with curved surfaces. In particular, the first ridge line 14a, the second ridge line 14b, and the fourth ridge line 14d are curved along the flow line of the fluid flow, and the deflection surface 15 and the side surface 17 are the flow lines of the fluid flow. In order to reduce fluid resistance, it is preferable to use a curved surface along the surface. By reducing this fluid resistance, vibration, noise and cavitation can be prevented, paint wear can be reduced, and marine organisms can be prevented from adhering to the stagnation point.

FIG. 11 is a perspective view of a flow field control device according to a third embodiment provided at a ship bottom water intake.
In this embodiment, the case where the ship-floor intake 22 is a flow field control target object and the hull is a flow field control target related object and the same flow field control device is installed in the hull is shown. The mounting surface 11 of the ship bottom water intake 22 is substantially flat.
In the flow field control device according to the present embodiment, two substantially triangular pyramids 10 are arranged symmetrically on the upstream side of the ship bottom intake 22 so that the fluid flow is opened. The two substantially triangular pyramids 10 are spaced apart by a predetermined dimension. The substantially triangular pyramid 10 has the apex 12 facing the bow side that is the upstream side of the fluid, the extended line of the second ridge line 14b is located at the center of the water intake 22 for the bottom, and the first ridge line 14a (fourth) The extended line of the ridge line 14d) is arranged not to pass through the water intake 22 for the bottom of the ship. Further, the length b between the sixth ridge lines 14 f of the two substantially triangular pyramids 10 is larger than the height dimension h of the water intake 22 for the ship bottom.
A reinforcing portion 20a is formed at the periphery of the opening of the water intake 22 for the ship bottom, and the substantially triangular pyramid 10 is provided at a position where the downstream end of the second ridge line 14b substantially contacts the reinforcing portion 20a.

In the flow field control apparatus according to the present embodiment, the first ridge line 14a, the second ridge line 14b, and the third ridge line 14c are configured by curves along the hull, and the mounting surface 11 is configured by a plane along the ship bottom. ing.
In addition, the fluid resistance can be reduced by configuring the fourth ridge line 14d, the fifth ridge line 14e, and the sixth ridge line 14f as curves, and configuring the deflection surface 15 and the side surface 17 as curved surfaces. In particular, the first ridge line 14a, the second ridge line 14b, and the fourth ridge line 14d are curved along the flow line of the fluid flow, and the deflection surface 15 and the side surface 17 are the flow lines of the fluid flow. In order to reduce fluid resistance, it is preferable to use a curved surface along the surface.

FIG. 12 is an explanatory diagram of a flow field control device according to the fourth embodiment provided on the ship side of the hull. In this embodiment, the case where the flow field control device is installed on the ship side 31 with the ship side 31 of the hull as the flow field control target is shown.
The ship side 31 of the hull in this case is a place where the streamlines of the fluid flowing on the surface of the ship side 31 formed of a curved surface draw a curve as shown in FIG.
Accordingly, in the present embodiment, the first ridge line 14a and the fourth ridge line 14d of the substantially triangular pyramid 10 are configured by curves along the streamline. For example, when the flow of water to a propeller (not shown) is changed to improve the propeller efficiency, it is effective to configure the ridgeline 14a and the ridgeline 14d with curves along the streamline.

FIG. 13 is an explanatory diagram of a flow field control device according to the fifth embodiment provided on the bottom of the hull.
This embodiment is an example applied to an air lubrication method in which bubbles are flowed to the ship bottom to reduce frictional resistance, and the case where the flow field control device is installed on the ship bottom 32 with the ship bottom 32 of the hull as a flow field control object. Show.
A bubble generation device 50 is provided on the bow side of the hull, and the bubble generation device 50 generates a large number of bubbles 51.
In the present embodiment, a plurality of substantially triangular pyramids 10 are sequentially arranged in a plurality of stages on the ship bottom 32 from the bow side, which is the upstream side of the fluid, to the stern side, which is the downstream side. The flow direction of the fluid is controlled, and the flow of the bubbles 51 is induced. In this case, the maximum thickness side of the triangular pyramid 10 is arranged inward so that the flow of bubbles does not escape outside the ship bottom 32.

In each of the above embodiments, at least one of the corners constituting the substantially triangular pyramid 10 may be rounded. By imparting roundness to the corners, fluid resistance can be reduced, and cavitation caused by sharp edges and wear of the corners themselves can be prevented.
As described above, according to these embodiments, the mounting surface 11 for mounting on the flow field control target object and the flow field control target related object, the apex 12 facing the upstream side of the fluid, and the downstream side of the fluid By forming the flow deflector 13 having a thickness in the direction of deflecting the fluid flow and forming the substantially triangular pyramid 10, the fluid flow direction in the flow field can be arbitrarily deflected.
Further, according to these embodiments, the mounting surface 11 includes the first ridge line 14a and the second ridge line 14b extending from the vertex to the downstream side, the downstream end of the first ridge line 14a, and the second ridge line 14b. An inner angle a formed by the second ridge line 14c and the third ridge line 14c, the third ridge line 14c connecting the downstream end part, the downstream end part of the first ridge line 14a having the maximum thickness. By configuring the at an acute angle, the effect of deflecting the fluid can be increased.

In addition, according to these embodiments, at least one of the planes constituting the substantially triangular pyramid 10 is configured by a curved surface, so that it is possible to follow the streamline, reducing fluid resistance, vibration, noise, It can prevent cavitation, reduce paint wear, and suppress the adhesion of marine organisms.
Moreover, even if the attachment surface 11 forms a curved surface, the substantially triangular pyramid 10 can be arranged in accordance with the curved surface.
Further, according to these embodiments, the ridgelines 14a, 14b, 14d, the deflecting surface 15 and the side surface 17 constituting the substantially triangular pyramid 10 are formed so as to be along the streamline of the fluid flow, thereby reducing fluid resistance. Therefore, it can be used to control the wake distribution near the propeller whose flow line is bent, to prevent the separation vortex near the bow.
In addition, according to these embodiments, the two substantially triangular pyramids 10 are symmetrically arranged on the upstream side of the flow field control object so that the fluid flow opens, so that the ship-side intake 21 and the ship-bottom intake are provided. It is possible to prevent air bubbles from entering 22. In addition, even if a change occurs in the inflow direction of the fluid, it is reduced that the fluid flow is induced and the flow deflection effect is impaired.

In addition, according to these embodiments, the flow of fluid can be deflected in a plurality of directions by arranging a plurality of substantially triangular pyramids 10.
Further, according to these embodiments, a plurality of substantially triangular pyramids 10 are sequentially arranged from the upstream side to the downstream side of the fluid, and the flow of the fluid flowing from the upstream to the downstream is guided in a plurality of directions by inducing the flow of the fluid. Or can be restricted to flow in one direction.
In addition, according to these embodiments, the flow field is a flow of bubbles mixed, and by guiding the flow of bubbles with a plurality of substantially triangular pyramids 10, the bubbles are kept away from the hull or the bubbles are collected on the hull. can do.
Further, according to these embodiments, the substantially triangular pyramid 30 is arranged with a predetermined angle c with respect to the fluid flow, whereby the deflection effect can be made different. Moreover, when the shape of the substantially triangular pyramid 30 is determined, a predetermined deflection can be obtained by adjusting and arranging the angle with respect to the streamline direction.

  The present invention can be widely used to control the flow field regardless of the type of fluid, including deflecting the flow direction of the fluid on the ship side and the bottom of the ship, for example, preventing the entry of bubbles from the water intake, the outside of the bottom of the ship It can be used to prevent escape of bubbles to the shore, control of wake distribution near the stern, prevention of separation vortices near the bow, and prevention of vibration and noise due to fluctuations in the flow field due to separation.

DESCRIPTION OF SYMBOLS 10 Substantially triangular pyramid 11 Mounting surface 12 Vertex 13 Flow deflection part 14a 1st ridgeline 14b 2nd ridgeline 14c 3rd ridgeline 14d 4th ridgeline 14e 5th ridgeline 14f 6th ridgeline 15 Deflection surface 16 Bottom surface 17 Side surface 20 Water intake opening 21 Ship side intake 22 Ship bottom intake

Claims (9)

A mounting surface for mounting on the flow field control object and / or flow field control object related object, a vertex facing the upstream side of the fluid, and a direction disposed on the downstream side of the fluid to deflect the flow of the fluid A first deflecting line that extends downstream from the apex, and a second ridge line that is longer than the first ridge line, and a second ridge line that is longer than the first ridge line. The second ridge line is connected to the downstream edge of the second ridge line, and the downstream edge of the first ridge line has a maximum thickness. An internal angle formed by a ridge line and the third ridge line is an acute angle, and is installed in a flow field to deflect the fluid flow. The flow field control device according to claim 1, wherein at least one of corners constituting the substantially triangular pyramid is rounded. Flow field control apparatus according to claim 1 or claim 2, characterized by being configured at least one plane which constitutes the substantially triangular pyramid with surfaces. Flow field control apparatus according to claim 1 or claim 2, characterized in that the formation of the ridge and planar constituting the substantially triangular pyramid as along a streamline of the fluid stream. Upstream of the flow field control object, the flow field according to one of claims 1 to 4, characterized in that two of said substantially triangular pyramid to open the flow of said fluid is arranged symmetrically Control device. Flow field control method characterized by controlling the flow direction of the fluid in the flow field by arranging a plurality of flow field controller as claimed in any one of claims 4. The flow field control method according to claim 6 , wherein a plurality of the flow field control devices are sequentially arranged from the upstream side to the downstream side of the fluid to induce the flow of the fluid. The flow field control method according to claim 6 or 7 , wherein the flow field is a flow mixed with bubbles, and the flow of the bubbles is induced by a plurality of the flow field control devices. A flow field control method according to claim 1, wherein the flow field control device according to any one of claims 1 to 4 is disposed at a predetermined angle with respect to the fluid flow.