WO2009128210A1 - 摩擦抵抗低減船およびその運転方法 - Google Patents
摩擦抵抗低減船およびその運転方法 Download PDFInfo
- Publication number
- WO2009128210A1 WO2009128210A1 PCT/JP2009/001528 JP2009001528W WO2009128210A1 WO 2009128210 A1 WO2009128210 A1 WO 2009128210A1 JP 2009001528 W JP2009001528 W JP 2009001528W WO 2009128210 A1 WO2009128210 A1 WO 2009128210A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- duct
- frictional resistance
- micro
- hull
- air
- Prior art date
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Classifications
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- 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 frictional drag reduction ship in which fine bubbles (micro bubbles) are supplied to the outer surface of a hull to reduce frictional drag between the hull and water, and a method of operating the same.
- Patent Document 1 As means for feeding air to the air bubble generating portion provided on the ship bottom (outside surface), a pipe is attached along the outside surface of the hull and means for supplying air by this pipe is proposed in Patent Document 1 and Patent Document 2 There is.
- Patent Document 3 describes that such microbubbles (microbubbles) are generated by the Kelvin-Helmholtz-Instability phenomenon.
- Patent Document 3 a recess is provided in the outer plate (submersible surface) of the bottom of the ship, a gas introduction pipe for supplying air is connected to the recess, and a bowl-shaped negative pressure forming portion is attached upstream of the recess.
- the Kelvin-Helmholtz instability phenomenon is generated inside to create micro bubbles (micro bubbles).
- patent document 4 the technique of using a wing instead of the bowl-shaped negative pressure formation part of patent document 3 is disclosed as a means to produce a micro bubble (micro bubble).
- Patent Literatures 3 and 4 it is possible to create microbubbles (microbubbles) preferable for reducing the frictional resistance.
- Patent Documents 1 and 2 each disclose that only one gas jet portion is provided in one pipe. Therefore, the micro-bubble generating member can not be provided not only to the outer shell of the ship bottom but also to the outer side surface of the hull.
- the frictional drag reduction vessel is provided with a duct for supplying air from the outer surface of the hull to the bottom of the hull, and the duct is divided into a plurality of independent chambers along the length direction. Piping for supplying air was introduced into each chamber, and a micro bubble generation member was attached to the opening formed in the chamber.
- the fine bubbles refer to bubbles having a particle diameter of several mm or less, preferably 1 mm or less.
- the structure of the micro-bubble generating member is not limited, but it comprises, for example, a plate fitted to an opening formed in the duct, and a wing for generating negative pressure attached to the plate, which faces the wing of the plate A window is formed at a portion where a gas-liquid unstable interface is formed when disturbance is caused by the negative pressure generated by the wing.
- an assist compressor is continuously used during navigation.
- the installation work is completed in a short period of time because it is not necessary to make a hole in the hull.
- air flows independently into the chamber formed by partitioning the duct, there is no shortage of air downstream of the duct. That is, since the bottom and the side of the hull can be covered with the micro bubbles (micro bubbles), the frictional resistance is further reduced and the fuel consumption is improved.
- the plate itself is used as the plate itself.
- the plate By forming a groove communicating the window and the inside of the duct, the plate can be attached to the duct at a position where the plate contacts the hull, so that the dimension of the duct (fine air bubble generating member) overhanging the hull is minimized. The resistance can be further reduced.
- FIG. 3 is a longitudinal cross-sectional view explaining the mechanism of micro bubble (micro bubble) generation
- (b) is a flat cross-sectional view explaining the mechanism of micro bubble (micro bubble) generation
- (A) is a figure similar to FIG. 4 which shows another embodiment
- (b) is a figure similar to FIG. 5 (b) which demonstrated the mechanism of micro bubble (micro bubble) generation
- FIG.1 (a) and (b) is a side view of the frictional resistance reduction ship concerning this invention
- FIG. 2 is a figure which shows a part of duct attached to the side of a frictional resistance reduction ship
- FIG. 3 A direction of FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3
- FIG. 5 (a) is a longitudinal cross-sectional view explaining the mechanism of microbubble generation
- FIG. 4B is microbubble generation. It is a plane sectional view explaining the mechanism of.
- the frictional drag reduction vessel according to the present invention is provided with a duct 3 for supplying air in the vertical direction along the bottom 2 from the outer side surface 1 of the hull.
- the left and right ends of the duct 3 are tapered to reduce the resistance during navigation.
- the tapered portion may use another member.
- the duct 3 itself is not a rectangular cross-section, but has a cross-sectional channel shape, and becomes a flat duct in which the amount of outward protrusion (H) is reduced when attached to the hull.
- a shaped duct may be attached to the hull.
- the overhang amount (H) is about 40 mm.
- each duct 3 is divided into a plurality of independent chambers 5... Along the length direction by partition walls 4. Pipings 6... For supplying air to each chamber 5 penetrate through the partition walls 4 and each chamber 5 The air is supplied from the assist compressor 7 into the pipe 6.
- An opening 8 is formed on the outer surface of each chamber 5, and a micro air bubble generating member 10 is attached to the opening 8.
- the arrangement of the micro bubble generating members 10 is staggered in FIG. 1 (b) so that the micro bubbles uniformly cover the surface of the hull.
- one micro bubble generation member 10 may be attached to one chamber 5.
- the micro-bubble generating member 10 is an oval (elliptical) plate 11 fitted in the opening 8 formed in the outer surface of the chamber 5, and a side view dolphin shaped to be attached to the plate 11 through the connecting portion 12. It consists of wings 13 and so on. Then, a rectangular window portion 14 having substantially the same shape as the outer shape of the wing 13 is formed at a position facing the wing 13 of the plate 11, and the surface 13 a facing the window portion 14 of the wing 13 is a window portion 14. It has a bulging convex shape.
- the wing 13 is mounted parallel to the outer side surface 1 of the hull, that is, with the opposing surface 13a in a substantially vertical state, and the front end edge of the wing 13 and the rear end edge of the wing 13 The distance g2 to the plate 11 is increased. With such a configuration, negative pressure is generated between the wing 13 and the window portion 14 when the ship is sailing.
- the negative pressure formed by the wing 13 causes the inside of the chamber 5 to The air-liquid interface goes down. Then, in order to further lower the gas-liquid interface to the vicinity of the window portion 14, the gas-liquid interface 15 is pushed down by the assist compressor 7.
- micro-bubble generating member 10 attached to the duct 3 (chamber 5) which has reached the bottom 2 of the vessel, unlike the micro-bubble generating member 10 vertically attached to the outer surface 1 of the hull The surface remains horizontal, and the occurrence of disturbance generates fine bubbles.
- FIG. 6 shows another embodiment of the micro bubble generating member 10, where (a) is the same as FIG. 4, and (b) is a diagram illustrating the mechanism of micro bubbles (micro bubbles) generation. Are the same as in FIG.
- the groove portion 16 communicating the window portion 14 with the inside of the chamber (duct) 5 is formed in the portion on the upstream side of the plate 11 with reference to the traveling direction of the ship (right direction in the figure). doing.
- the groove portion 16 is formed so as not to interfere with the mounting hole of the bolt within the range of the thickness of the plate 11, so the thickness of the plate 11 shown in the above embodiment does not change. There is no change in the thickness of the plate 11 and air can be supplied into the window 14 through the grooves 16 within the thickness range of the plate 11. Therefore, the protrusion amount can be suppressed until the back side of the plate 11 hits the hull. Out.
- the overhang amount (H) can be about 20 mm, which is half the thickness of the above embodiment.
- the Kelvin-Helmholtz instability phenomenon occurs in the inner part of the window portion 14, thereby generating micro bubbles.
- the micro bubble generation member 10 is provided with the plate 11 and the wing 13.
- other micro bubble generation members can be employed.
- a punching plate having a continuous-cell ceramic porous body or fine holes formed in the opening 8 formed in the chamber 5 is fixed, and the gas-liquid interface is pushed down to the ceramic porous body or punching plate by an assist compressor. You may
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Farming Of Fish And Shellfish (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Accessories For Mixers (AREA)
Abstract
Description
また、ダクトを区画して形成されたチャンバーには独立して空気が流入するため、ダクトの下流側において空気が不足することがない。つまり、船体の底面および側面を微小気泡(マイクロバブル)で覆うことができるので、摩擦抵抗が更に低減され、燃費が向上する。
例えば、チャンバー5に形成した開口部8に連続気泡構造のセラミック多孔体や微細な孔を形成したパンチングプレートを固定し、アシストコンプレッサで気液境界面をセラミック多孔体やパンチングプレートの位置まで押し下げるようにしてもよい。
Claims (4)
- 船体の外側面から船底に沿って空気供給用のダクトを設け、このダクトを長さ方向に沿って独立した複数のチャンバーに区画し、各チャンバー毎に空気を供給するための配管を導入し、前記チャンバーに形成した開口部に微細気泡発生部材を取り付けたことを特徴とする摩擦抵抗低減船。
- 請求項1に記載の摩擦抵抗低減船において、前記微細気泡発生部材は前記ダクトに形成した開口部に嵌め付けられるプレートと、このプレートに取り付けられる負圧発生用のウイングとからなり、前記プレートのウイングと対向する箇所には前記チャンバー内と外部とを連通する窓部が形成されていることを特徴とする摩擦抵抗低減船。
- 請求項2に記載の摩擦抵抗低減船において、船の進行方向を基準として、前記プレートの上流側となる部分に前記窓部とダクト内とを連通する溝部が形成されていることを特徴とする摩擦抵抗低減船。
- 請求項1乃至請求項3に記載の摩擦抵抗低減船の運転方法であって、アシストコンプレッサによってダクト内の気液境界面を微細気泡発生部まで押し下げるとともに船の航行に伴って前記ウイングによって発生する負圧によりダクト内の空気を微細気泡として船体に沿って排出し、この状態を維持しつつ航行することを特徴とする摩擦抵抗低減船の運転方法。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09731481.9A EP2277770A4 (en) | 2008-04-17 | 2009-04-01 | SHIP WITH REDUCED FRICTION RESISTANCE AND OPERATING METHOD THEREFOR |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2008-107482 | 2008-04-17 | ||
JP2008107482 | 2008-04-17 | ||
JP2008110812A JP4183048B1 (ja) | 2008-04-17 | 2008-04-22 | 摩擦抵抗低減船およびその運転方法 |
JP2008-110812 | 2008-04-22 |
Publications (1)
Publication Number | Publication Date |
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WO2009128210A1 true WO2009128210A1 (ja) | 2009-10-22 |
Family
ID=40148562
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/001531 WO2009128211A1 (ja) | 2008-04-17 | 2009-04-01 | 摩擦抵抗低減船およびその運転方法 |
PCT/JP2009/001528 WO2009128210A1 (ja) | 2008-04-17 | 2009-04-01 | 摩擦抵抗低減船およびその運転方法 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2009/001531 WO2009128211A1 (ja) | 2008-04-17 | 2009-04-01 | 摩擦抵抗低減船およびその運転方法 |
Country Status (6)
Country | Link |
---|---|
US (2) | US8011310B2 (ja) |
EP (2) | EP2277770A4 (ja) |
JP (4) | JP4183048B1 (ja) |
KR (2) | KR20100127860A (ja) |
CN (1) | CN102341300A (ja) |
WO (2) | WO2009128211A1 (ja) |
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US7806064B2 (en) * | 2008-03-12 | 2010-10-05 | Wellman John G | Friction reducing pollution control system for marine vehicles |
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JP2011011699A (ja) * | 2009-07-06 | 2011-01-20 | Anlet Co Ltd | 船体における微細気泡発生装置 |
DK201070283A (en) * | 2010-06-22 | 2012-02-02 | Maersk Olie & Gas | Reducing drag of a hull of a ship |
JP5087158B1 (ja) * | 2011-06-28 | 2012-11-28 | 三菱重工業株式会社 | 船舶の空気潤滑システム、摩擦抵抗低減型船舶及びその製造方法 |
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2008
- 2008-04-22 JP JP2008110812A patent/JP4183048B1/ja active Active
- 2008-06-18 JP JP2008158636A patent/JP2009274704A/ja active Pending
- 2008-06-24 JP JP2008164871A patent/JP4286313B1/ja active Active
- 2008-06-25 JP JP2008165728A patent/JP2009274706A/ja active Pending
-
2009
- 2009-04-01 EP EP09731481.9A patent/EP2277770A4/en not_active Withdrawn
- 2009-04-01 CN CN2009801111672A patent/CN102341300A/zh active Pending
- 2009-04-01 WO PCT/JP2009/001531 patent/WO2009128211A1/ja active Application Filing
- 2009-04-01 KR KR1020107024069A patent/KR20100127860A/ko active IP Right Grant
- 2009-04-01 US US12/922,174 patent/US8011310B2/en active Active - Reinstated
- 2009-04-01 KR KR1020107022831A patent/KR20100125405A/ko not_active Application Discontinuation
- 2009-04-01 EP EP09732525.2A patent/EP2272748A4/en not_active Withdrawn
- 2009-04-01 WO PCT/JP2009/001528 patent/WO2009128210A1/ja active Application Filing
- 2009-04-04 US US12/418,572 patent/US7654212B2/en not_active Expired - Fee Related
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US8011310B2 (en) | 2011-09-06 |
JP2009274704A (ja) | 2009-11-26 |
JP2009274705A (ja) | 2009-11-26 |
EP2272748A4 (en) | 2013-06-26 |
JP2009274706A (ja) | 2009-11-26 |
JP4286313B1 (ja) | 2009-06-24 |
CN102341300A (zh) | 2012-02-01 |
EP2277770A1 (en) | 2011-01-26 |
KR20100127860A (ko) | 2010-12-06 |
EP2277770A4 (en) | 2013-06-26 |
US20090260561A1 (en) | 2009-10-22 |
WO2009128211A1 (ja) | 2009-10-22 |
JP4183048B1 (ja) | 2008-11-19 |
JP2009274463A (ja) | 2009-11-26 |
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