JPS6141685A - Method of reducing frictional resistance of water under water line in time of ship nevigation and device thereof - Google Patents
Method of reducing frictional resistance of water under water line in time of ship nevigation and device thereofInfo
- Publication number
- JPS6141685A JPS6141685A JP16361584A JP16361584A JPS6141685A JP S6141685 A JPS6141685 A JP S6141685A JP 16361584 A JP16361584 A JP 16361584A JP 16361584 A JP16361584 A JP 16361584A JP S6141685 A JPS6141685 A JP S6141685A
- Authority
- JP
- Japan
- Prior art keywords
- ship
- frictional resistance
- hull
- compressed air
- water line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は船舶航行時における吃水線下、の船体が受け
る水の摩擦抵抗を少なくして、燃料消費量の低減を計る
ための方法装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for reducing the frictional resistance of water that is applied to the hull of a ship below the waterline during navigation, thereby reducing fuel consumption.
船舶の航行において船舶の受ける抵抗は、風、潮流、波
浪そして水の粘度に依る摩擦抵抗である。現在の船舶に
おいてこの水の摩擦抵抗を軽減するため船体構造の改造
、塗料の改善等が進められているが、水に粘度が有るの
で限界が有ると同時に大巾な改善は望めな勢のが現状で
ある。The resistance a ship encounters during navigation is wind, current, waves, and frictional resistance due to the viscosity of water. In order to reduce the frictional resistance of water on current ships, efforts are being made to modify the hull structure and improve paints, but water has viscosity, so there are limits, and at the same time, it is difficult to expect major improvements. This is the current situation.
本発明社船体廻夕の水の粘度を下げて船体が受ける摩擦
抵抗を少なくすることを目的とする。The purpose of the present invention is to reduce the viscosity of water in a ship's hull, thereby reducing the frictional resistance that the ship's hull receives.
本発明を図面にもとづいて説明すると、船舶の吃水線下
に設けた圧搾空気の送気管から圧搾空気を放射して吃水
線下の船体廻９に空気と水の気液混合体を形成させる。The present invention will be explained based on the drawings. Compressed air is radiated from a compressed air supply pipe provided below the water line of a ship to form a gas-liquid mixture of air and water around the hull 9 below the water line.
水はもともと常温１気圧でその体績の約２−の空気を吸
収しているが、気液混合体の粘性係数は気泡の混合率が
増加するに従い低下する。Originally, water absorbs about 2 times the amount of air at room temperature of 1 atm, but the viscosity coefficient of a gas-liquid mixture decreases as the mixing ratio of air bubbles increases.
便宜的な籠であるが気泡の混合率差に依る気液混合体の
みかけの粘性係数を実験式から気液の温ｊｉ！ｔｓ℃、
１気圧として算出すると、
水の粘性係数：１１６．０Ｘ１０ ｋ・〜背空気の粘
性係数： Ｌ８４４ Ｘ ｔｏ ｈ −８／ｌ 故
に以上の如く粘性係数が低下する。すなわち摩擦抵抗が
軽減されることであり、十分に船舶航行に要する燃料消
費量は軽減される。Although this is a convenient basket, the apparent viscosity coefficient of a gas-liquid mixture that depends on the difference in the mixing ratio of bubbles can be calculated from an empirical formula to calculate the temperature of the gas-liquid! ts℃,
Calculated as 1 atm: Viscosity coefficient of water: 116.0 x 10 k - Viscosity coefficient of back air: L844 x to h -8/l Therefore, the viscosity coefficient decreases as described above. In other words, the frictional resistance is reduced, and the amount of fuel consumed for navigation of the ship is sufficiently reduced.
又、気泡の作用として波浪を打消す効果があけられる。Additionally, the effect of the bubbles is to cancel out waves.
これは非圧縮性の水の中に圧縮性でおる空気泡が存在す
ることで波浪の伝達力が吸収されるためと、しわれるが
、この現象によシ船舶１本が作９山１波浪を小さくする
ことができ大型船舶が小型船舶に与える波浪の危険性も
軽減することが可能である。と同時に気泡の利用方法に
より船舶航行方向の後方に発生するカルマン渦流の発生
低減効果が望める。It is believed that this is because the presence of compressible air bubbles in incompressible water absorbs the transmission force of waves. It is also possible to reduce the risk of waves from large ships to small ships. At the same time, the use of air bubbles can be expected to have the effect of reducing the Karman vortex that occurs behind the vessel in the direction of travel.
これらの現象効果を得るために作りだす圧縮空気のエネ
ルギー消費量は圧縮空気を斜め後方に放射することで推
進力として還元される。The energy consumption of the compressed air produced to obtain these phenomena is returned as propulsive force by radiating the compressed air diagonally backward.
一般に船舶の航行速度を２倍にすると約４倍の燃料を消
費するといわれ省エネルギ一対策上航行速度を減速して
運航されているのが現状であるが本発明の方法装置の採
用により少なくとも５チ以上の燃料消費量の改善が望め
るものと思われ、工業上利用価値のきわめて高いもので
ある。It is generally said that doubling the cruising speed of a ship consumes about four times as much fuel, and currently ships are operated at a reduced cruising speed as a measure to save energy. It is thought that it can be expected to improve fuel consumption by more than 30%, and has extremely high industrial utility value.
第１図は船体の側面図を示す。
イ、圧搾空気の送気管
口、吃水線
ハ、圧搾空気放射孔
第２図は船体の正面図を示す。
イ、圧搾空気の送気管
口、吃水線
第３図は船体の断面図を示す。
イ、圧搾空気の送気管
口、吃水線
ハ、圧搾空気放射孔
二、気泡部を表わし、気液混合体が船腹を包んだ状況を
表わす。Figure 1 shows a side view of the hull. (a) Compressed air supply pipe opening, water line (c), compressed air radiation hole Figure 2 shows a front view of the hull. B. Compressed air supply pipe port, water line Figure 3 shows a cross-sectional view of the hull. (a) shows the compressed air supply pipe opening, (c) the water line, (c) the compressed air radiation hole (2), and the bubble area, and shows the situation where the gas-liquid mixture surrounds the hull of the ship.
Claims (1)
船体廻りの水中に放射する装置A device that installs a compressed air supply pipe below the water line of a ship and radiates compressed air into the water around the ship's hull.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16361584A JPS6141685A (en) | 1984-08-03 | 1984-08-03 | Method of reducing frictional resistance of water under water line in time of ship nevigation and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16361584A JPS6141685A (en) | 1984-08-03 | 1984-08-03 | Method of reducing frictional resistance of water under water line in time of ship nevigation and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6141685A true JPS6141685A (en) | 1986-02-28 |
Family
ID=15777290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16361584A Pending JPS6141685A (en) | 1984-08-03 | 1984-08-03 | Method of reducing frictional resistance of water under water line in time of ship nevigation and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6141685A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994026583A1 (en) * | 1993-05-11 | 1994-11-24 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Method of reducing friction on cruising body, cruising body with reduced friction, method of and apparatus for generating microbubbles for use in reduction of friction |
| US6145459A (en) * | 1997-12-19 | 2000-11-14 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Friction-reducing ship and method for reducing skin friction |
| EP2123551A1 (en) * | 2008-05-06 | 2009-11-25 | Zuei-Ling Lin | Method of reducing frictional resistance between ship body and water by releasing gases in water |
| US7874258B2 (en) * | 2008-04-29 | 2011-01-25 | Zuei-Ling Lin | Method of reducing frictional resistance between ship body and water by releasing gases in water |
| CN102897282A (en) * | 2012-10-12 | 2013-01-30 | 华南理工大学 | Device mounted on ship for reducing sailing resistance |
| GB2505281A (en) * | 2012-08-24 | 2014-02-26 | Foreship Ltd | Air bubble hull lubrication system for a ship |
| CN103661789A (en) * | 2012-09-25 | 2014-03-26 | 陈庆元 | Technology for reducing resistance of water to sailing ship |
-
1984
- 1984-08-03 JP JP16361584A patent/JPS6141685A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994026583A1 (en) * | 1993-05-11 | 1994-11-24 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Method of reducing friction on cruising body, cruising body with reduced friction, method of and apparatus for generating microbubbles for use in reduction of friction |
| US5575232A (en) * | 1993-05-11 | 1996-11-19 | Hiroharu Kato | Method and device for reducing friction on a navigating vehicle |
| US6145459A (en) * | 1997-12-19 | 2000-11-14 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Friction-reducing ship and method for reducing skin friction |
| US7874258B2 (en) * | 2008-04-29 | 2011-01-25 | Zuei-Ling Lin | Method of reducing frictional resistance between ship body and water by releasing gases in water |
| EP2123551A1 (en) * | 2008-05-06 | 2009-11-25 | Zuei-Ling Lin | Method of reducing frictional resistance between ship body and water by releasing gases in water |
| GB2505281A (en) * | 2012-08-24 | 2014-02-26 | Foreship Ltd | Air bubble hull lubrication system for a ship |
| GB2505236A (en) * | 2012-08-24 | 2014-02-26 | Foreship Ltd | An air bubble system for a ship |
| GB2505281B (en) * | 2012-08-24 | 2014-08-06 | Foreship Ltd | Air bubble system for ships |
| CN103661789A (en) * | 2012-09-25 | 2014-03-26 | 陈庆元 | Technology for reducing resistance of water to sailing ship |
| CN102897282A (en) * | 2012-10-12 | 2013-01-30 | 华南理工大学 | Device mounted on ship for reducing sailing resistance |
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