EP1747142A1 - Procede et dispositif pour diminuer la friction de l'eau sur une coque de bateau - Google Patents

Procede et dispositif pour diminuer la friction de l'eau sur une coque de bateau

Info

Publication number
EP1747142A1
EP1747142A1 EP05747669A EP05747669A EP1747142A1 EP 1747142 A1 EP1747142 A1 EP 1747142A1 EP 05747669 A EP05747669 A EP 05747669A EP 05747669 A EP05747669 A EP 05747669A EP 1747142 A1 EP1747142 A1 EP 1747142A1
Authority
EP
European Patent Office
Prior art keywords
hull
gas
ship
water
area
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.)
Withdrawn
Application number
EP05747669A
Other languages
German (de)
English (en)
Inventor
Udo Wulf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Logistics GmbH
Original Assignee
New Logistics GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by New Logistics GmbH filed Critical New Logistics GmbH
Publication of EP1747142A1 publication Critical patent/EP1747142A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0391—Affecting flow by the addition of material or energy

Definitions

  • the invention relates to a method for reducing the water friction on a hull of a ship, in particular an inland ship, according to the preamble of claim 1, in which a gas is emitted in at least one delivery area provided on the hull below the water level between the hull and the water surrounding it.
  • the invention further relates to a device for reducing the water friction on a hull of a ship according to the preamble of claim 7, with a device for generating a gas flow on the underwater hull of the hull, and at least one delivery area provided on the hull, which is in flow connection with the device, and which is designed to deliver gas between the hull and the water surrounding it.
  • the object of the invention is to provide a method and a device with which the water friction on the hull can be effectively reduced in a particularly economical manner.
  • a method for reducing the water friction on a hull of a ship is characterized in that the gas is introduced into the water in an upper region of the hull near the water level, and that the introduced gas when the ship is traveling with a resulting water flow along the hull aft into a lower area of the hull, especially under the ship's bottom.
  • a basic idea of the invention can be seen in that the gas is introduced not only on the ship's bottom, but at least partially in the vicinity of the ship's swimming water line, in particular on the bow side. The water flow at the bow can be used to transport the gas deep below the ship's floor.
  • the static back pressure to be overcome when introducing the gas can be a particularly relevant factor for the overall efficiency of the method, in particular for a device that may be required to generate the gas flow.
  • a device that may be required to generate the gas flow.
  • an electrical fan output of more than 150 kW may be required.
  • this electrical fan output could be reduced to below 40 kW.
  • the method according to the invention can also be used in the hulls of seagoing vessels.
  • the method is particularly suitable in connection with inland waterway vessels, in particular of flat-going, ie relatively shallow draft ships.
  • the hull can be designed particularly advantageously for the water flow downward transport of the introduced gas.
  • the gas provided according to the invention can in principle be chosen arbitrarily. However, a particularly economical method is that the gas is air.
  • a delivery area in the sense of the invention can in particular be understood to mean an area on the hull at which the gas from the ship inside the hull through the hull wall out into the surrounding water.
  • the hull suitably has insertion openings in the delivery area. These insertion openings can be designed, for example, as holes in rows of holes. Alternatively or additionally, the holes can also be formed in a porous material.
  • the gas is preferably released in the form of bubbles, in particular microbubbles, between the hull and the surrounding water.
  • the upper area of the hull is understood to mean, in particular, such an area which is arranged directly below the swimming water line.
  • the upper region suitably extends from the water level to a maximum of approximately 1.5 m, preferably 1 m, in depth.
  • the upper area is preferably a bow area of the ship.
  • the lower lying area, into which the gas is led with the water flow, is suitably arranged in the area of the ship's bottom.
  • a particularly preferred development of the method according to the invention is characterized in that the gas introduced is guided on an inclined bend into the lower region of the ship's body. It is particularly advantageous that the inclined bend is in the form of a lying wedge. With such an inclined bend shape it can be largely prevented that the introduced gas flows out laterally to the water flow in the direction of the water surface. In particular, a stern and connection area with the preferably largely flat ship floor can adjoin the inclined bow.
  • An advantageous further development of the method according to the invention also consists in that the gas introduced is guided between two guide elements or catamaran hulls arranged on the outside of the ship's body into the lower region of the ship's hull.
  • the guide elements are preferably arranged laterally on the wedge-shaped inclined bend.
  • the guide elements which are designed, for example, as catamaran hulls, can in particular serve to reduce the lateral outflow of the introduced gas in a direction transverse to the water flow.
  • the gas it is expedient for the gas to be introduced into the water depending on the position of the ship, in particular depending on the draft.
  • This can be understood in particular to mean that the gas is introduced very high on the hull when the ship is deep, ie when the cargo is high, whereas it is introduced deep on the hull near the bottom of the ship when the draft is low.
  • the height of the upper area on the hull is thus varied depending on the position of the ship, in particular depending on the draft. This can ensure that the gas is always brought into the water close to the water level, regardless of depth and position.
  • provision can be made, for example, to shift the height of the delivery area, in particular a delivery opening, on the hull.
  • a geometric position of the hull, in particular its draft, is determined and that, depending on the geometric position, at least one delivery area in the upper area of the hull is released for the gas and further delivery areas at a lower height for the hull the gas will be blocked.
  • several delivery areas are therefore provided on the hull at different heights. From these delivery areas, depending on the geometrical position, the delivery area lying below the current water level, that is to say the delivery area which is closest to the water line, is released for the gas. If necessary, lower-lying delivery areas can also be released for particularly effective air bubble lubrication.
  • the geometric position depending on which the delivery areas are released or blocked, can be understood in particular as the draft of the hull.
  • the geometric position of the hull can also be characterized, for example, by rolling and / or stamping the hull and corresponding deflection angles. In this way, it can be ensured according to the invention that the gas is always emitted immediately below the water level even when the sea is rough. To take account of the sea state, it can alternatively or additionally also be provided that when the ship is at rest there is a certain minimum distance between the released delivery area and the water level.
  • a particularly effective air lubrication can be obtained according to the invention by introducing the gas into the water in the form of gas bubbles, in particular as a bubble curtain.
  • the gas bubbles are in a predetermined stood at least partially out of the water from the opened delivery area and then reintroduced the gas into the water with a further blower device in order to restore the size of the original bubble.
  • the distance can be between 4 m and 6 m, for example.
  • this procedure can be comparatively energy-intensive. It is therefore particularly preferred according to the invention that the gas bubbles on the underwater ship of the hull are guided and / or structured along a guide surface, in particular with a fiber material and / or a thread material.
  • This guide coating can in particular be designed such that the gas bubbles flow as microbubbles in the guide coating or along its surface while largely maintaining the bubble size.
  • the guide covering can in particular have fibers and / or threads, the length of which is in the range of the desired bubble size or is also longer.
  • the fibers and / or the threads preferably also have a color coating. Structuring in the sense of the invention can in particular be understood to mean that the gas bubble size is largely maintained and / or newly produced.
  • the device according to the invention is characterized in that the at least one dispensing area is arranged in an upper area of the hull near a water line of the hull on an inclined bow which, when the ship is traveling, guides the discharged gas with the water flow aft into a lower-lying area of the hull Hull is formed.
  • the device according to the invention is particularly suitable for carrying out the method according to the invention, whereby the advantages mentioned in this connection can be achieved.
  • the at least one delivery area is not directly in the lower-lying area of the hull, i.e. to be arranged on the ship's bottom. Rather, the at least one delivery area is arranged near the waterline of the hull, where the gas can be introduced into the water with a comparatively low power of the device for generating the gas flow.
  • the at least one delivery area is arranged on the inclined bow so that when the ship is traveling, the released gas is guided with the water flow along the inclined bow into the lower-lying area of the hull and thus also provides air lubrication there.
  • a particularly preferred development of the invention consists in the inclined bow being arranged between two guide elements or catamaran hulls located on the outside of the hull.
  • the inclined bow can advantageously be designed in the form of a lying wedge, which can be followed aft by the advantageously flat ship floor.
  • the underwater ship is suitably designed as described in German patent application 103 43 078.
  • a further preferred development of the invention is characterized in that several discharge areas are provided on the hull at different heights, and in that between the device for generating the gas flow and a valve device for regulating the gas flow is arranged in each case in the delivery areas.
  • This further development according to the invention makes it possible, in particular depending on the draft and / or position, to supply the delivery area with gas, which is arranged in the upper area of the hull directly below the water level.
  • lower-lying delivery areas and / or delivery areas located above the water level can be individually blocked for gas passage by means of the valve device. This ensures particularly efficient air lubrication. Because of the individual controllability of the different delivery areas by the valve devices, only a single device for generating the gas flow is required, which can supply all delivery areas. In principle, however, several such devices can also be provided, which can be controlled individually.
  • valve devices it is also possible to operate the valve devices manually as a function of the draft of the ship.
  • a control device is provided which is operatively connected to the valve devices for controlling the gas flow depending on the geometric position of the hull, in particular its draft.
  • the control device can automatically detect the position of the ship, for which purpose a determination of the load weight can also be provided.
  • the control device according to the invention can provide a particularly reliable device according to the invention.
  • the at least one delivery is rich for dispensing the gas in the form of gas bubbles, in particular porous.
  • the dispensing area can in particular be flat and have a spray body which, for example, has a porous plastic material and / or a porous ceramic material.
  • a particularly suitable embodiment of the invention consists in that a guide covering, in particular a fiber covering, is provided on the underwater ship of the hull, in particular on the inclined bow, for guiding and / or structuring the gas bubbles.
  • the guide covering can be embedded in the hull and / or glued to it, for example.
  • the guide covering usefully has individual covering strips which are arranged transversely to the direction of travel on the hull. A distance between the individual covering strips is suitably about 2 m to 8 m, in particular 4 m to 6 m.
  • the device for generating the gas flow has at least one blower.
  • the at least one blower is advantageously connected to the delivery areas via a line system which is arranged in the interior of the hull, the valve devices then being able to be arranged on the line system.
  • FIG. 1 is a perspective view of the underwater ship of a hull for performing the method according to the invention.
  • FIG. 2 shows a longitudinal section along AA of the hull from FIG. 1 with a device according to the invention for carrying out the method according to the invention at different draft.
  • FIGS. 1 and 2 A hull for carrying out the method according to the invention is shown in FIGS. 1 and 2 in the sense of a bow module.
  • the hull is semi-catamaran-like and has an inclined bow 46, on the port side and starboard side of which a catamaran hull 41, 42 is provided.
  • the catamaran hulls 41, 42 are designed in the form of standing wedges in their bow region.
  • the inclined bow 46 is in the form of a lying wedge.
  • Recesses 43, 44 are provided in the catamaran hulls 41, 42 for receiving drive means.
  • the recesses 43, 44 extend from the inclined bow 46 diagonally aft through the catamaran hulls 41, 42 to the outside of the hull.
  • the bow module with angled bow 46 has a box-like stern area 48 aft with an essentially flat ship floor 49, by which one or more e.g. can connect pontoon-like hull modules.
  • guide elements 50, 50 ′ extend at the stern area 48 in an extension of the catamaran hulls 41, 42, which protrude downward from the ship's bottom 49 and limit it laterally.
  • FIG. 2 A device according to the invention for performing the method according to the invention is shown in FIG. 2.
  • This shows a sectional view along AA of the hull Fig. 1 at different draft t, t ', t''due to a different cargo weight of the ship.
  • the water level is designated by the reference numerals 10, 10 ', 10'', which also corresponds to the water line on the hull due to the different immersion depth.
  • the device according to the invention has a device 36 designed as a fan for generating a gas flow.
  • the device 36 is connected via a line system 37 to three spatially separate delivery areas 21, 22, 23, which are provided at different heights of the hull in the wall of the inclined bow 46. Through these discharge areas 21, 22, 23, the gas, in particular air, can be introduced into the water surrounding the hull.
  • a valve device 31, 32, 33 is provided in the line system 37 in front of each delivery area 21, 22, 23.
  • valve devices 31, 32, 33 are set in such a way that gas only emerges from the delivery area which is arranged directly below the respective water level 10, 10 ', 10' '.
  • the other delivery areas, e.g. 22, 23, however, are blocked by means of the valve devices 32, 33.
  • At draft t only discharge area 21 is thus released, at draft t 'only discharge area 22 and at draft t' 'only discharge area 23 is released for the gas flow.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Cleaning Or Clearing Of The Surface Of Open Water (AREA)

Abstract

L'invention concerne un procédé pour diminuer la friction de l'eau sur la coque d'un bateau, en particulier un bateau fluvial, selon lequel un gaz, situé en dessous de la surface de l'eau (10, 10', 10'') entre la coque et l'eau environnante, est introduit. Le procédé de l'invention est caractérisé en ce que le gaz est introduit dans la partie supérieure de la coque à proximité de la surface de l'eau dans l'eau, et ledit gaz est dirigé à l'arrière dans la carène, en particulier sous la cale, un courant étant obtenu le long de la coque, lors de la trajectoire du bateau. L'invention concerne, de plus, un dispositif pour diminuer le frottement de l'eau sur la coque d'un bateau.
EP05747669A 2004-05-17 2005-05-13 Procede et dispositif pour diminuer la friction de l'eau sur une coque de bateau Withdrawn EP1747142A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410024343 DE102004024343A1 (de) 2004-05-17 2004-05-17 Verfahren und Vorrichtung zur Verminderung der Wasserreibung an einem Schiffskörper eines Schiffes
PCT/EP2005/005268 WO2005113326A1 (fr) 2004-05-17 2005-05-13 Procede et dispositif pour diminuer la friction de l'eau sur une coque de bateau

Publications (1)

Publication Number Publication Date
EP1747142A1 true EP1747142A1 (fr) 2007-01-31

Family

ID=34969310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05747669A Withdrawn EP1747142A1 (fr) 2004-05-17 2005-05-13 Procede et dispositif pour diminuer la friction de l'eau sur une coque de bateau

Country Status (7)

Country Link
US (1) US20110146806A1 (fr)
EP (1) EP1747142A1 (fr)
JP (1) JP2007537917A (fr)
BR (1) BRPI0510133A (fr)
CA (1) CA2565008A1 (fr)
DE (1) DE102004024343A1 (fr)
WO (1) WO2005113326A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008006479A1 (de) 2008-01-29 2009-07-30 Lieke, Michael, Dr. Auftriebsvorrichtungen für Wasserfahrzeuge zur Minimierung des Wasserwiderstandes während der Fahrt
DE102010044866A1 (de) 2010-07-21 2012-02-02 Klaus Lindemann Verfahren und Anordnung zur Minderung der Wasserreibung an Wasserfahrzeugen
DE102012001230A1 (de) 2012-01-18 2013-07-18 Klaus Lindemann Verfahren und Anordnung zur Minderung der Wasserreibung an Wasserfahrzeugen
USD795783S1 (en) * 2015-03-10 2017-08-29 Silverstream Technologies B.V. Air cavity for hull surface of vessel
USD886026S1 (en) * 2015-03-10 2020-06-02 Silverstream Technologies B.V. Set of air cavities for hull surface of vessel

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Also Published As

Publication number Publication date
BRPI0510133A (pt) 2007-10-02
US20110146806A1 (en) 2011-06-23
DE102004024343A1 (de) 2005-12-22
WO2005113326A1 (fr) 2005-12-01
JP2007537917A (ja) 2007-12-27
CA2565008A1 (fr) 2005-12-01

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