WO2010058613A1 - 船体摩擦抵抗低減装置 - Google Patents
船体摩擦抵抗低減装置 Download PDFInfo
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- WO2010058613A1 WO2010058613A1 PCT/JP2009/052815 JP2009052815W WO2010058613A1 WO 2010058613 A1 WO2010058613 A1 WO 2010058613A1 JP 2009052815 W JP2009052815 W JP 2009052815W WO 2010058613 A1 WO2010058613 A1 WO 2010058613A1
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- Prior art keywords
- air
- diffusion plate
- air chamber
- frictional resistance
- plate
- Prior art date
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- 238000009792 diffusion process Methods 0.000 claims description 100
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000013535 sea water Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
Definitions
- the present invention relates to a hull frictional resistance reduction device that reduces the frictional resistance of a navigating hull by generating bubbles from a plurality of air ejection holes formed on the bottom of the ship to form a bubble film on the bottom of the ship.
- a hull frictional resistance reduction device having a gas chamber formed in the ship width direction in a ship at the bottom of the bow.
- a connection opening to which a high-pressure gas supply pipe is connected is formed at the top wall, and the bottom plate portion corresponding to the gas chamber is notched so that there is no bottom plate. It is an opening.
- a baffle plate for receiving a high-pressure gas flow from the connection opening is disposed inside the gas chamber, and by providing the baffle plate, the high-pressure gas filled in the gas chamber is discharged from the bottom opening to the water. It is press-fitted in a substantially uniform state.
- the bottom of the gas chamber of the hull frictional resistance reducing device has a bottom plate
- the bottom of the gas chamber of the hull frictional resistance reducing device usually has a bottom plate.
- a large number of air ejection holes are formed in a line.
- FIGS. 18 to 20 a conventional baffle plate (so-called diffusion plate) is arranged inside a gas chamber (so-called air chamber) formed by arranging a large number of air ejection holes in the bottom plate.
- a gas chamber sin-called air chamber
- FIGS. 18 to 20 The uniformity of the flow rate of air ejected from a number of air ejection holes will be examined.
- 18 is a perspective view schematically showing an air chamber according to Patent Document 1.
- FIG. 19 is a cross-sectional view of the air chamber of Patent Document 1 shown in FIG.
- FIG. 20 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of Patent Document 1.
- the vertical axis represents the air ejection amount
- the horizontal axis represents the position of each air ejection hole.
- the air chamber 200 is formed in a rectangular box shape, and is arranged in the longitudinal direction of the air chamber 200 at the bottom (that is, the ship bottom) of the air chamber 200.
- a large number of air ejection holes 201 are formed, and an air supply port 202 is formed near the center of the top wall of the air chamber 200.
- the air chamber 200 is provided with a diffusion plate 205 that receives air sent from the air supply port 202, and the diffusion plate 205 is provided at a position substantially the same as that of a conventional baffle plate.
- the flow rate of air ejected from the air ejection holes 202 located directly below the diffusion plate 205 is reduced, and the air flow rate increases as the distance from the diffusion plate 205 increases.
- an object of the present invention is to provide a hull frictional resistance reduction device capable of uniformly ejecting air from a plurality of air ejection holes formed on the bottom of a ship provided with an air chamber.
- the hull frictional resistance reduction device of the present invention is a hull frictional resistance reduction device that reduces the frictional resistance of a navigating hull by generating bubbles and forming a bubble film on the bottom of the ship.
- a diffusion plate interposed between and at least a supply port facing region facing the air supply port, and air ejection holes located at both ends in the arrangement direction of the plurality of air ejection holes. And a pair of jet hole facing areas facing each other.
- the diffusion plate is formed in a rectangular plate shape including the supply port facing region and all the ejection hole facing regions facing all the air ejection holes arranged, and the diffusion plate is disposed.
- a diffusion opening continuously extending in the arrangement direction is formed between the diffusion plate and the inner wall surface of the air chamber.
- the diffusion plate it is preferable that four diffusion openings are formed between the diffusion plate and the inner wall surface of the air chamber inside the air chamber in which the diffusion plate is disposed.
- the diffusion plate is composed of a central rectangular plate formed so as to include the supply port facing region and a pair of side rectangular plates formed so as to include the pair of ejection hole facing regions, A pair of diffusion openings formed between the central square plate and the pair of side square plates may be formed inside the air chamber in which the central square plate and the pair of side square plates are disposed.
- the diffusion plate can be formed so as to include at least the supply port facing region and the pair of ejection hole facing regions. For this reason, it can be made easy to flow air into the air ejection hole located just under the air supply port, because the supplied air is less likely to flow into the air ejection holes on both sides in the arrangement direction. Thereby, the flow volume of the air ejected from the plurality of air ejection holes can be made substantially uniform.
- the configuration of the diffusion plate can be simplified, and the diffusion plate can be easily installed inside the air chamber. Can be done.
- the center of the cross plate can be widened by configuring the diffusion plate with the cross plate. For this reason, even if the diameter of the air supply port is increased and the supply port facing region is expanded, the diameter of the expanded air supply port can be allowed by making the center of the cross plate correspond to the supply port facing region. it can.
- the diffuser plate by forming the diffuser plate with the central square plate and the pair of side square plates, it is possible to suitably reduce the amount of air ejected from the plurality of air ejection holes. It can be uniform.
- FIG. 1 is a side view schematically showing a hull equipped with a hull frictional resistance reduction device according to the first embodiment.
- FIG. 2 is an explanatory diagram relating to the configuration of the hull frictional resistance reduction device according to the first embodiment.
- FIG. 3 is a perspective view schematically showing a conventional air chamber not provided with a diffusion plate.
- FIG. 4 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in a conventional air chamber.
- FIG. 5 is a perspective view schematically illustrating an air chamber of the hull frictional resistance reduction device according to the first embodiment. 6 is a cross-sectional view of the air chamber of Example 1 shown in FIG. FIG.
- FIG. 7 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of the first embodiment.
- FIG. 8 is a perspective view schematically illustrating an air chamber of the hull frictional resistance reduction device according to the second embodiment.
- FIG. 9 is a cross-sectional view of the air chamber of Example 2 shown in FIG.
- FIG. 10 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of the second embodiment.
- FIG. 11 is a perspective view schematically illustrating an air chamber of the hull frictional resistance reduction device according to the third embodiment.
- 12 is a cross-sectional view of the air chamber of Example 3 shown in FIG.
- FIG. 13 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of Example 3.
- FIG. 14 is a perspective view schematically illustrating an air chamber of the hull frictional resistance reduction device according to the fourth embodiment.
- FIG. 15 is a cross-sectional view of the air chamber of Example 4 shown in FIG.
- FIG. 16 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of Example 4.
- FIG. 17 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of Example 4 when the aperture ratio of the perforated plate is changed. It is.
- FIG. 18 is a perspective view schematically showing an air chamber according to Patent Document 1.
- FIG. 19 is a cross-sectional view of the air chamber of Patent Document 1 shown in FIG.
- FIG. 20 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of Patent Document 1.
- FIG. 1 is a side view schematically showing a hull equipped with the hull frictional resistance reducing device according to the first embodiment
- FIG. 2 is an explanation regarding the configuration of the hull frictional resistance reducing device according to the first embodiment
- FIG. 3 is a perspective view schematically showing a conventional air chamber in which no diffusion plate is provided.
- FIG. 4 shows the positions of the air ejection holes and the air ejection holes in the conventional air chamber. It is a graph showing the relationship with the flow volume of the air ejected from.
- 5 is a perspective view schematically showing an air chamber of the hull frictional resistance reducing device according to the first embodiment.
- FIG. 6 is a sectional view of the air chamber of the first embodiment shown in FIG.
- FIG. 7 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of the first embodiment.
- the hull frictional resistance reduction device 10 generates bubbles from a plurality of air ejection holes 15 formed on the bottom 5 to form a bubble film on the bottom 5, thereby reducing the frictional resistance of the navigating hull 1. It is to reduce.
- the hull 1 on which the hull frictional resistance reducing device 10 is mounted is, for example, a flat bottom ship with a flat bottom 5, and the hull frictional resistance reducing device 10 is on the bow side of the hull 1. It is arranged.
- the hull frictional resistance reduction device 10 is applicable not only to a flat bottom ship but also to other ships.
- the hull frictional resistance reduction device 10 includes a large number of air ejection holes 15 formed in the bottom 5, a blower 16 that can supply air toward the large number of air ejection holes 15, a blower 16, and a large number of air ejection holes 15. And an air supply passage 17 for connecting the two.
- a large number of air ejection holes are arranged side by side in the width direction of the hull 1 to form air ejection hole groups 30a, 30b, 30b.
- a plurality of air ejection hole groups 30a, 30b, 30b are formed in the ship bottom 5 (Example). 1 is formed, for example, three).
- One of the three air ejection hole groups 30a, 30b, and 30b is a central air ejection hole group 30a formed at the center in the width direction on the bow side, and the other two are the stern of the central air ejection hole group 30a.
- the central air ejection hole group 30 a is disposed on the bow side of the hull 1, and the pair of side air ejection hole groups 30 b and 30 b are formed near the center of the hull 1.
- the blower 16 is disposed on the bow side of the hull 1 and functions as an air supply source capable of supplying air toward the numerous air ejection holes 15.
- the blower 16 uses an electric motor 19 as a drive source, and the supply amount of air sent from the blower 16 can be controlled by controlling the rotation speed of the electric motor 19.
- the blower 16 has a shorter installation distance from the central air ejection hole group 30a than the side air ejection hole groups 30b and 30b, and both the blower 16 and the central air ejection hole group 30a Arranged on the bow side of the hull 1.
- the air supply source is not limited to the blower 16, and for example, an air compressor or the like may be used.
- the single blower 16 is used.
- the present invention is not limited to this, and a plurality of blowers 16 may be used.
- the air supply passage 17 includes a main supply pipe 20 having one end connected to the blower 16, a plurality of branch supply pipes 21 connected to the main supply pipe 20, and a plurality of air chambers 22 connected to the plurality of branch supply pipes 21.
- a primary air tank 23 is interposed in the main supply pipe 20. That is, the main supply pipe 20 includes an upstream main supply pipe 20a that connects the blower 16 and the primary air tank 23, and a downstream main supply pipe 20b that connects the primary air tank 23 and the plurality of branch supply pipes 21.
- the downstream main supply pipe 20b is provided with an air flow meter 24 for measuring the flow rate of the air flowing in the downstream main supply pipe 20b, and each branch supply pipe 21 is opened and closed.
- Each on-off valve 25 is interposed.
- the primary air tank 23 is configured to be able to store air supplied from the blower 16 via the upstream main supply pipe 20a. Then, by providing the primary air tank 23 in the main supply pipe 20, it is possible to alleviate the air pressure fluctuation (so-called air pulsation) generated in the blower 16 and the upstream main supply pipe 20a.
- the plurality of air chambers 22 are formed in a rectangular box shape, and are arranged corresponding to a number of air ejection holes 15 formed in the ship bottom 5. That is, a plurality of air ejection holes 15 are formed on the bottom surface (that is, the ship bottom) of each air chamber 22.
- Each air chamber 22 has an air supply port 28 to which each branch supply pipe 21 is connected (see FIG. 5) at substantially the center of the top wall surface.
- the plurality of air chambers 22 includes a plurality of central air chambers 22a corresponding to the central air ejection hole group 30a, and a plurality of side air chambers 22b corresponding to the pair of side air ejection hole groups 30b and 30b. , Is composed of.
- the plurality of center-side air chambers 22a are formed in a rectangular box shape, the longitudinal direction of which coincides with the ship width direction, and is arranged side by side in the ship width direction. And by supplying air to the some central side air chamber 22a from the blower 16, air is ejected from the central air ejection hole group 30a, and a bubble is generated.
- the plurality of side air chambers 22b are formed in a rectangular box shape like the plurality of center side air chambers 22a, and the longitudinal direction thereof is aligned with the ship width direction and arranged side by side in the ship width direction. It is installed. At this time, the plurality of side air chambers 22 b are divided into two corresponding to the pair of side air ejection holes 15. Then, by supplying air to each of the plurality of side air chambers 22b divided from the blower 16, air is ejected from the pair of side air ejection hole groups 30b and 30b to generate bubbles.
- the air flow meter 24 measures the flow rate of the air flowing in the downstream main supply pipe 20b, and the supply amount of air supplied from the blower 16 based on the measurement result of the air flow meter 24. Is controlling.
- the plurality of on-off valves 25 interposed in the plurality of branch supply pipes 21 function as so-called check valves, and prevent seawater from entering the air supply passage 17 on the upstream side from the on-off valves 25. It is arranged. Specifically, when the operation of the hull frictional resistance reduction device 10 is stopped, that is, when the drive of the blower 16 is stopped, the injection of air from each air ejection hole 15 is stopped. For this reason, seawater flows into each air chamber 22 through each air ejection hole 15. At this time, since each air chamber 22 communicates with each branch supply pipe 21, by closing the on-off valve 25, seawater can be prevented from entering each branch supply pipe 21 upstream from the on-off valve 25. ing.
- the air blown from the blower 16 flows into the primary air tank 23 via the upstream main supply pipe 20a, and then the downstream main supply pipe 20b and the plurality of branch supply pipes 21.
- the air flows into each air chamber 22 via.
- the air supply amount of the blower 16 is adjusted by controlling the electric motor 19 based on the measurement result of the air flow meter 24.
- the air is jetted into the water through each air ejection hole 15 to generate bubbles from the ship bottom 5.
- a plurality of air chambers 22 that are characteristic features of the present invention will be described.
- a plurality of air ejection holes 15 are formed in the ship bottom 5 corresponding to the air chambers 22 arranged at the bottom of the hull 1 so as to penetrate in the ship width direction.
- the flow rate of the air ejected from the plurality of air ejection holes 201 is adjusted. What is difficult to make uniform is as shown in the graph of FIG.
- a rectangular diffusion plate 35 is disposed inside each air chamber 22.
- the diffusion plate 35 formed in a rectangular shape has a longitudinal direction in the ship width direction, and is in the same direction as the longitudinal direction of each air chamber 22.
- the diffusion plate 35 is disposed so as to be parallel to the ship bottom 5.
- the diffusion plate 35 is disposed so as to face the air supply port 28 formed in the air chamber 22 and is disposed so as to face all the air ejection holes 15 arranged in a row. That is, the diffusion plate 35 is formed so as to include a supply port facing region S1 that faces the air supply port 28 and an entire ejection hole facing region S3 that faces all the air ejection holes 15. At this time, the entire ejection hole facing area S3 includes a pair of ejection hole facing areas S2 and S2 facing the air ejection holes 15 located at both ends of the plurality of air ejection holes 15 in the ship width direction (arrangement direction). Yes.
- Both ends of the diffusion plate 35 in the ship width direction are attached to the inner wall of the air chamber 22, and both ends of the diffusion plate 35 in the ship length direction are free ends. For this reason, a pair of slit openings 38, 38 (diffusion openings) extending in the ship width direction are formed between both inner walls of the air chamber 22 and the diffusion plate 35 in the ship length direction.
- this diffuser plate 35 since this diffuser plate 35 only attaches the both ends of a ship width direction to the inner wall of the air chamber 22, attachment work of the diffuser plate 35 can be performed easily, and the diffuser plate 35 is a rectangle. Therefore, the configuration of the diffusion plate 35 itself can be simplified.
- the air supplied through the air supply port 28 blows against the diffusion plate 35 and flows along the diffusion plate 35, and then passes through each of the air ejection holes via the pair of slit openings 38 and 38. It flows toward 15.
- the flow rate of air ejected from the plurality of air ejection holes 15 is as shown in the graph of FIG.
- the air chamber 22 is a conventional air chamber 22 in which no diffusion plate 35 is provided, and the configuration thereof is the same as that of the air chamber described in the first embodiment. .
- description of the air chamber 22 shown in FIG. 3 is abbreviate
- the vertical axis represents the air flow rate
- the horizontal axis represents the position of each air ejection hole 15. That is, the horizontal axis numbers the plurality of air ejection holes 15 arranged in sequence from the air ejection holes 15 on one end side in the ship width direction to the air ejection holes 15 on the other end side. It is a thing.
- the tenth air ejection hole 15 on the horizontal axis is the air ejection hole 15 located immediately below the air supply port 28.
- the flow rate of air ejected from the tenth air ejection hole 15 is the largest, and the air is ejected from the air ejection hole 15 toward the air ejection holes 15 at both ends.
- the air flow rate decreases. Therefore, in the air chamber 22 shown in FIG. 3, the air ejected from the plurality of air ejection holes 15 cannot be made uniform.
- the graph of FIG. 7 is ejected from the air ejection hole 15 located immediately below the air supply port 28 as compared with the graph of FIG. 4.
- the flow rate of air to be discharged decreased, and the flow rate of air to be ejected from the air ejection holes 15 located at both ends in the ship width direction increased. That is, the graph shown in FIG. 7 was made uniform compared to the graph shown in FIG.
- the graph of FIG. 7 is ejected from the air ejection hole 15 located immediately below the air supply port 28 as compared to the graph of FIG. 20.
- the flow rate of air increased and the flow rate of air ejected from the air ejection holes 15 located at both ends in the ship width direction decreased. That is, the graph shown in FIG. 7 was made uniform compared to the graph shown in FIG.
- the longitudinal direction of the rectangular diffusion plate 35 is the same as the arrangement direction of the plurality of air ejection holes 15, the diffusion plate 35 and the plurality of air ejection holes 15 face each other, and the diffusion plate 35
- a pair of slit openings 38, 38 can be formed between both inner walls of the air chamber 22 and the diffusion plate 35.
- the air flow rate can be made substantially uniform. Therefore, since it becomes easy to make the film thickness of the bubble film formed on the ship bottom 5 uniform, the effect of reducing the frictional resistance of the hull 1 can be sufficiently exhibited.
- the diffusion plate 35 is formed in a rectangular plate shape, the configuration of the diffusion plate 35 can be simplified, and the diffusion plate 35 can be easily attached to the inside of the air chamber 22.
- FIG. 8 is a perspective view schematically showing an air chamber of the hull frictional resistance reduction device according to the second embodiment
- FIG. 9 is a cross-sectional view of the air chamber of the second embodiment shown in FIG.
- FIG. 10 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of the second embodiment.
- the diffusion plate 55 provided in the air chamber 22 is configured in a cross-shaped plate shape.
- the diffusing plate 55 formed in a cross shape has a configuration in which a rectangular plate that is long in the ship width direction and a rectangular plate that is short in the ship length direction are crossed. It is arrange
- the diffusion plate 55 is disposed so that the center of the intersecting portion faces the air supply port 28 and also faces all the air ejection holes 15 arranged in a line. That is, the diffusion plate 55 is formed so as to include the supply port facing region S1 facing the air supply port 28 and the entire ejection hole facing region S3 facing all the air ejection holes 15, and further, the diffusion plate. 55 is formed so as to include a central region S4 in the center in the ship width direction of the pair of slit openings 38 of the first embodiment.
- Both ends of the diffusion plate 55 in the ship width direction are attached to the inner wall of the air chamber 22, and both ends of the diffusion plate 55 in the ship length direction are also attached to the inner wall of the air chamber 22.
- four slit openings 58, 58, 58, 58 are formed between the inner wall corner 56 of the air chamber 22 and the diffusion plate 55, and each slit opening extends in the ship width direction. It is formed as follows.
- the air supplied through the air supply port 28 blows against the diffusion plate 55 and flows along the diffusion plate 55, and then passes through the four slit openings 58, 58, 58 and 58. It flows toward each air ejection hole 15.
- the flow rate of air ejected from the plurality of air ejection holes 15 is as shown in the graph of FIG. That is, the graph shown in FIG. 10 is more uniform than the graph shown in FIG. 4, and more uniform than the graph shown in FIG.
- the cross-shaped diffusion plate 55 and all the air ejection holes 15 face each other, and the diffusion plate 55 and the air supply port 28 face each other, thereby diffusing with the inner wall corner portion 56 of the air chamber 22.
- Four slit openings 58, 58, 58, 58 can be formed between the plate 55.
- the air supplied through the air supply port 28 is supplied toward the plurality of air injection holes 15 through the four slit openings 58, 58, 58, 58, 58, 58, thereby providing a plurality of air injection holes.
- the flow rate of the air ejected from 15 can be made substantially uniform.
- the diffusion plate 55 is formed in a cross shape and each slit opening 58 is formed in a square shape.
- the slit opening 58 may be formed in a triangle shape
- the diffusion plate 55 may be formed in a diamond shape or an octagon shape. .
- FIG. 11 is a perspective view schematically showing an air chamber of the hull frictional resistance reduction device according to the third embodiment.
- FIG. 12 is a cross-sectional view of the air chamber of the third embodiment shown in FIG.
- FIG. 12 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of the third embodiment.
- the hull frictional resistance reduction device 80 includes a central rectangular plate 87 in which a diffusion plate 85 provided in the air chamber 22 includes a supply port facing region S1 and a pair of ejection hole facing regions S2. , S2 and a pair of side rectangular plates 88, 88 formed to include S2.
- the central rectangular plate 87 is formed in a rectangular plate shape that is long in the ship width direction, and is disposed so as to face the air supply port 28, and is disposed so as to be parallel to the ship bottom 5.
- the both ends of the central square plate 87 in the ship width direction are free ends, and the both ends of the central square plate 87 in the ship length direction are attached to the inner wall of the air chamber 22.
- the pair of side square plates 88 and 88 are formed in a rectangular plate shape that is long in the ship length direction, and a plurality of air jet holes arranged in a row are a pair of air jet holes at both ends in the ship width direction. Are arranged so as to face each other and to be parallel to the ship bottom 5.
- One end of each side square plate 88 in the ship width direction is attached to the inner wall of the air chamber, and the other end is a free end. Both end portions of each side square plate 88 in the ship length direction Is attached to the inner wall of the air chamber 22.
- the central square plate 87 and the pair of side square plates 88 and 88 are disposed in the same plane. For this reason, a pair of diffusion openings 89 and 89 are formed between the central square plate 87 and the pair of side square plates 88 and 88.
- the diffusion plate 85 has a configuration in which a pair of side square plates 88 and 88 are disposed at both ends in the ship width direction of the central rectangular plate 87 via a pair of diffusion openings 89 and 89. .
- the air supplied through the air supply port 28 blows against the central rectangular plate 87 and flows along the central rectangular plate 87. Thereafter, each air passes through the pair of diffusion openings 89 and 89. It flows toward the ejection hole 15.
- the flow rate of air ejected from the plurality of air ejection holes 15 is as shown in the graph of FIG. That is, the graph shown in FIG. 13 is more uniform than the graph shown in FIG. 4, and is more uniform than the graph shown in FIG.
- the central square plate 87 and the air supply port 28 face each other, and the pair of side square plates 88 and 88 and the air ejection holes 15 at both ends in the arrangement direction face each other.
- a pair of diffusion openings 89 and 89 can be formed between the pair of side square plates 88 and 88.
- the central square plate 87 and the pair of side square plates 88, 88 are disposed in the same plane.
- the central square plate 87 and the pair of lateral sides are perpendicular to each other in the same plane.
- the square plates 88 and 88 may be arranged so as to be shifted.
- FIG. 14 is a perspective view schematically showing an air chamber of the hull frictional resistance reduction device according to the fourth embodiment.
- FIG. 15 is a cross-sectional view of the air chamber of the fourth embodiment shown in FIG.
- FIG. 16 is a graph showing the relationship between the position of each air ejection hole and the flow rate of air ejected from each air ejection hole in the air chamber of the fourth embodiment.
- the diffusion plate 105 provided in the air chamber 22 is a perforated plate.
- the diffusion plate 105 is formed in a rectangular plate shape, and a large number of through holes 106 are formed on the surface thereof, and are arranged so as to be parallel to the ship bottom 5. Further, the diffusion plate 105 is disposed so as to face the air supply port 28, and is disposed so as to face all the air ejection holes 15 arranged in a line.
- the diffusion plate 105 has both ends in the ship width direction attached to the inner wall of the air chamber 22, and both ends in the ship length direction are also attached to the inner wall of the air chamber 22. That is, the diffusion plate 105 is disposed so as to divide the air chamber 22 into two layers in the vertical direction.
- the air supplied through the air supply port 28 blows against the diffusion plate 105, so that a part of the air flows along the diffusion plate 105 and a part of the air passes through each through hole 106. It flows toward the air ejection hole 15.
- the flow rate of air ejected from the plurality of air ejection holes 15 was as shown in the graph of FIG. That is, the graph shown in FIG. 16 is more uniform than the graph shown in FIG. 4, and is more uniform than the graph shown in FIG. Further, as can be seen from the graph shown in FIG. 17, it was found that it is preferable to use a porous plate having an opening ratio of 3% to 50% when the opening ratio of the diffusion plate 105 to be a porous plate is changed. .
- the diffusion plate 105 serving as a perforated plate, the air supply port 28, and all the air ejection holes 15 face each other, whereby air is supplied to the plurality of air ejection holes 15 through the plurality of through holes 106. Can be supplied towards. As a result, air supplied through the air supply ports 28 is supplied to the plurality of air injection holes 15 through the plurality of through holes 106, so that the air is ejected from the plurality of air injection holes 15. Can be made substantially uniform.
- the diffusion plate is formed in a hollow hemispherical shape and a plurality of through holes are formed on the surface thereof, and the circular opening of the diffusion plate is opposed to the air supply port 28. You may arrange
- only one diffusion plate 105 serving as a perforated plate is provided.
- a plurality of diffusion plates 105 may be provided in the vertical direction.
- a spatial air distribution route can be established by tomographically dividing the air chamber 22 with the diffusion plate 105, and the flow rate of air ejected from the plurality of air ejection holes 15 is made substantially uniform. be able to.
- the air supply port 28 is formed on the top wall surface of the air chamber 22.
- the present invention is not limited to this, and may be formed on the side wall surface. In this case, it is necessary to appropriately adjust the disposition position of the diffusion plate so as to be interposed between the air supply port 28 and the plurality of air ejection holes 15.
- the hull frictional resistance reduction device is useful in the case where a plurality of air ejection holes are formed in the bottom of the hull, particularly when air is uniformly ejected from the plurality of air ejection holes. Is suitable.
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Abstract
Description
5 船底
10 船体摩擦抵抗低減装置
15 空気噴出孔
16 ブロア
17 空気供給通路
20 主供給管
21 分岐供給管
22 エアーチャンバ
22a 中央側エアーチャンバ
22b 側方側エアーチャンバ
23 一次エアタンク
24 空気流量計
25 開閉弁
28 空気供給口
30a 中央空気噴出孔群
30b 側方空気噴出孔群
35 拡散板
38 スリット開口
50 船体摩擦抵抗低減装置(実施例2)
55 拡散板(実施例2)
56 内壁角部
58 スリット開口(実施例2)
80 船体摩擦抵抗低減装置(実施例3)
85 拡散板(実施例3)
87 中央方形板
88 側方方形板
89 拡散開口
100 船体摩擦抵抗低減装置(実施例4)
105 拡散板(実施例4)
106 貫通孔
S1 供給口対面領域
S2 噴出孔対面領域
S3 全噴出孔対面領域
S4 中央領域
Claims (4)
- 気泡を発生させて船底に気泡膜を形成することにより、航行する船体の摩擦抵抗を低減する船体摩擦抵抗低減装置において、
前記船体内部の船底に配設され、空気供給口が形成されたエアーチャンバと、
前記エアーチャンバの底部となる前記船底に列設して形成された複数の空気噴出孔と、
前記エアーチャンバの内部に設けられ、前記空気供給口と前記複数の空気噴出孔との間に介在させた拡散板と、を備え、
前記拡散板は、少なくとも、前記空気供給口に対面する供給口対面領域と、前記複数の空気噴出孔の配列方向の両端部に位置する空気噴出孔に対面する一対の噴出孔対面領域と、を含むように形成されていることを特徴とする船体摩擦抵抗低減装置。 - 前記拡散板は、前記供給口対面領域と、列設した全ての前記空気噴出孔に対面する全噴出孔対面領域と、を含むような方形の板状に形成され、
前記拡散板が配設された前記エアーチャンバの内部には、前記拡散板と前記エアーチャンバの内壁面との間に、配列方向に連続して延びる拡散開口が形成されていることを特徴とする請求項1に記載の船体摩擦抵抗低減装置。 - 前記拡散板が配設された前記エアーチャンバの内部には、前記拡散板と前記エアーチャンバの内壁面との間に、4つの拡散開口が形成されていることを特徴とする請求項1に記載の船体摩擦抵抗低減装置。
- 前記拡散板は、前記供給口対面領域を含むように形成された中央方形板と、前記一対の噴出孔対面領域を含むように形成された一対の側方方形板と、で構成され、
前記中央方形板および前記一対の側方方形板が配設された前記エアーチャンバの内部には、前記中央方形板と前記一対の側方方形板との間に形成された一対の拡散開口が形成されていることを特徴とする請求項1に記載の船体摩擦抵抗低減装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP09827394.9A EP2353992B1 (en) | 2008-11-21 | 2009-02-18 | Device for reducing frictional resistance of ship body |
KR1020117000902A KR101249166B1 (ko) | 2008-11-21 | 2009-02-18 | 선체 마찰 저항 저감 장치 |
US12/997,962 US8402906B2 (en) | 2008-11-21 | 2009-02-18 | Device for reducing frictional resistance of ship body |
CN200980130031.6A CN102112366B (zh) | 2008-11-21 | 2009-02-18 | 船体摩擦阻力降低装置 |
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JP2008298729A JP4959667B2 (ja) | 2008-11-21 | 2008-11-21 | 船体摩擦抵抗低減装置 |
JP2008-298729 | 2008-11-21 |
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WO2010058613A1 true WO2010058613A1 (ja) | 2010-05-27 |
Family
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PCT/JP2009/052815 WO2010058613A1 (ja) | 2008-11-21 | 2009-02-18 | 船体摩擦抵抗低減装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8402906B2 (ja) |
EP (1) | EP2353992B1 (ja) |
JP (1) | JP4959667B2 (ja) |
KR (1) | KR101249166B1 (ja) |
CN (1) | CN102112366B (ja) |
WO (1) | WO2010058613A1 (ja) |
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Publication number | Publication date |
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KR20110023883A (ko) | 2011-03-08 |
US8402906B2 (en) | 2013-03-26 |
KR101249166B1 (ko) | 2013-04-01 |
CN102112366A (zh) | 2011-06-29 |
CN102112366B (zh) | 2014-01-01 |
EP2353992A1 (en) | 2011-08-10 |
JP4959667B2 (ja) | 2012-06-27 |
JP2010120609A (ja) | 2010-06-03 |
EP2353992A4 (en) | 2013-05-01 |
US20110094435A1 (en) | 2011-04-28 |
EP2353992B1 (en) | 2015-08-05 |
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