DE454552C - Method for reducing the frictional resistance of ships - Google Patents
Method for reducing the frictional resistance of shipsInfo
- Publication number
- DE454552C DE454552C DEE32075D DEE0032075D DE454552C DE 454552 C DE454552 C DE 454552C DE E32075 D DEE32075 D DE E32075D DE E0032075 D DEE0032075 D DE E0032075D DE 454552 C DE454552 C DE 454552C
- Authority
- DE
- Germany
- Prior art keywords
- ship
- ships
- frictional resistance
- reducing
- speed
- 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.)
- Expired
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
-
- 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
- B63B2001/387—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes using means for producing a film of air or air bubbles over at least a significant portion of the hull surface
-
- 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
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Description
Verfahren zur Verringerung des Reibungswiderstands bei Schiffen. Die Erfindung betrifft die Verminderung des Reibungswiderstandes bei Schiffen.Method for reducing the frictional resistance of ships. the The invention relates to the reduction of frictional resistance in ships.
Die Erfindung geht von der an sich bekannten Tatsache aus, daß bei einem fahrenden Schiff die Wirkung der Reibung auf der. Pahrtwiderstand sich hauptsächlich dadurch äußert, daß die umgebenden Wasserteilchen an den Außenwandungen haften bleiben, von diesen in der Fahrtrichtung beschleunigt werden und sich schließlich in Kraft verzehrenden Wirbeln vom Schiff loslösen müssen.The invention is based on the fact, known per se, that in a moving ship the effect of friction on the. Ground resistance itself mainly is expressed by the fact that the surrounding water particles stick to the outer walls, are accelerated by these in the direction of travel and finally come into force have to detach the consuming eddies from the ship.
Es ist bereits bekannt, zur Vermeidung dieses Nachteils aus am Schiffsboden angebrachten @5ffnungen entweder gasförmige oder flüssige Medien oder auch ein Gemisch von beiden herauszupressen, so diaß eine Schicht entsteht, durch die die direkte Berührung zwischen den benetzten Teilen der Schiffsoberfläche und dem umgebenden Wasser möglichst aufgehoben und damit die Beschleunigung von Wasserteilchen in der Fahrtrichtung vermieden werden soll.It is already known to avoid this disadvantage from on the ship's bottom attached openings either gaseous or liquid media or a mixture to squeeze out of both, so that a layer arises through which the direct Contact between the wetted parts of the ship's surface and the surrounding area Water, if possible, and thus the acceleration of water particles in the Direction of travel should be avoided.
Nach der Erfindung soll ein Gemisch aus einem flüssigen und einem gasförmigen Medium in einem geeigneten Mischungsverhältnis durch zweckmäßige Vorrichtungen unter Wasser ausgestoßen und in einer solchen Richtung beschleunigt werden, daß die Schicht eine geringe Dicke und eine der Fahrtrichtung entgegengesetzte, der Schiffsgeschwindigkeit annähernd gleiche Geschwindigkeit durch im Schiff vorhandene Kraftmittel erhält und sich möglichst dem Verlaufe der Schiffswandungen anpaßt. Durch die Verwendung einer aus einem Gemisch von flüssigen und gasförmigen Medien gebildeten Gleitschicht wird erreicht, daß die gasförmigen Bestandteile der das Schiff in einem dünnen Mantel umgebenden Gleitschicht eine Verminderung des spezifischen Gewichtes und des Reibungswertes der Schicht gegenüber der Außenhaut und dem Seewasser bewirken.According to the invention, a mixture of a liquid and a gaseous medium in a suitable mixing ratio through appropriate devices ejected under water and accelerated in such a direction that the layer has a small thickness and one opposite to the direction of travel, the Ship speed approximately the same as the speed available in the ship Receives power means and adapts itself as possible to the course of the ship's walls. By using a mixture of liquid and gaseous media formed sliding layer is achieved that the gaseous components of the Schiff in a thin jacket surrounding sliding layer a reduction of the specific Weight and the coefficient of friction of the layer against the outer skin and the sea water cause.
Ferner wird, wenn h, die Schiffsgeschwindigkeit und hg die der Gleitschicht mit Hilfe besonderer Kraftmittel des Schiffes erteilte, der Schiffsgeschwindigkeit gegenläufige Ge-#-chwindigkeit bedeuten, die Relativgeschwindigkeit des Schiffes V,. zu dem umgebenden Außenwasser um so kleiner werden, je mehr !lg vergrößert wird und schließlich bei Vg - V, zu O werden. Da die Größe des Reibungswiderstandes W,. bei Einschaltung einer rückläufigen Gleitschicht von der Größe der Relativgeschwindigkeit V,. abhängt, wird er bei entsprechender rückläufiger Geschwindigkeit Vg der Gleitschicht stark verkleinert werden.Further, if h becomes the ship's speed and hg becomes that of the sliding layer with the help of special power means of the ship, the ship's speed opposite speeds mean the relative speed of the ship V ,. to the surrounding outside water, the smaller, the more! lg is enlarged and finally at Vg - V, become O. Since the magnitude of the frictional resistance W ,. when a retrograde sliding layer is switched on, the size of the relative speed V ,. depends, it becomes Vg of the sliding layer with a corresponding declining speed can be greatly reduced.
Bei Verwendung geeigneter Austrittsorgane kann die Dicke der Gleitschicht gering sein, die Wirkung der einzelnen Austrittsorgane kann sich über eine größere Fläche der Außenhaut erstrecken und ihre Gesamtzahl infolgedessen geringer sein, was eine Vereinfachung der praktischen Ausführung ergibt.When using suitable outlet organs, the thickness of the sliding layer be small, the effect of the individual outlet organs can be greater Extend the surface of the outer skin and, as a result, their total number will be less, which results in a simplification of the practical implementation.
Infolge der der Gleitschicht erteilten lebendigen Kraft spielen Druckschwankungen des umgebenden Wassers infolge von Seegang u. dgl. keine wesentliche Rolle. Ferner können die Strömungs- und Wirbelerscheinungen um das fahrende Schiff in einem für die Verringerung des Widerstandes günstigen Sinne beeinflußt werden.As a result of the living force imparted to the sliding layer, pressure fluctuations play a role of the surrounding water due to swell and the like does not play an essential role. Further can the flow and eddy phenomena around the moving ship in one for the reduction of the resistance favorable sense can be influenced.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE32075D DE454552C (en) | 1925-02-20 | 1925-02-20 | Method for reducing the frictional resistance of ships |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE32075D DE454552C (en) | 1925-02-20 | 1925-02-20 | Method for reducing the frictional resistance of ships |
Publications (1)
Publication Number | Publication Date |
---|---|
DE454552C true DE454552C (en) | 1928-01-12 |
Family
ID=7075407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEE32075D Expired DE454552C (en) | 1925-02-20 | 1925-02-20 | Method for reducing the frictional resistance of ships |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE454552C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1807002A1 (en) * | 1967-11-11 | 1969-06-12 | Waertsilae Oy Ab | Ship hull with device to reduce friction |
-
1925
- 1925-02-20 DE DEE32075D patent/DE454552C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1807002A1 (en) * | 1967-11-11 | 1969-06-12 | Waertsilae Oy Ab | Ship hull with device to reduce friction |
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