WO2010109252A2 - Hull for high-speed vessels of embossed surface with dimples - Google Patents

Hull for high-speed vessels of embossed surface with dimples Download PDF

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Publication number
WO2010109252A2
WO2010109252A2 PCT/GR2010/000014 GR2010000014W WO2010109252A2 WO 2010109252 A2 WO2010109252 A2 WO 2010109252A2 GR 2010000014 W GR2010000014 W GR 2010000014W WO 2010109252 A2 WO2010109252 A2 WO 2010109252A2
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WO
WIPO (PCT)
Prior art keywords
hull
dimples
vessel
speed
embossed surface
Prior art date
Application number
PCT/GR2010/000014
Other languages
French (fr)
Other versions
WO2010109252A3 (en
Inventor
Dimitrios Damtsas
Original Assignee
Dimitrios Damtsas
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
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Application filed by Dimitrios Damtsas filed Critical Dimitrios Damtsas
Publication of WO2010109252A2 publication Critical patent/WO2010109252A2/en
Publication of WO2010109252A3 publication Critical patent/WO2010109252A3/en

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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
    • 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
    • B63B1/36—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using mechanical means
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C21/00—Influencing air flow over aircraft surfaces by affecting boundary layer flow
    • B64C21/10—Influencing air flow over aircraft surfaces by affecting boundary layer flow using other surface properties, e.g. roughness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/002—Influencing flow of fluids by influencing the boundary layer
    • F15D1/0025—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply
    • F15D1/003—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply comprising surface features, e.g. indentations or protrusions
    • F15D1/005—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply comprising surface features, e.g. indentations or protrusions in the form of dimples
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/10—Influencing flow of fluids around bodies of solid material
    • F15D1/12—Influencing flow of fluids around bodies of solid material by influencing the boundary layer
    • 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 invention concerns the design and construction of a high-speed vessel hull, whose surface is embossed. Namely, it presents dimples (D), in a specific repeated pattern (Dimpled Hull).
  • the vessel's hull is characterized by its embossed surface, and more specifically has uniform dimples of equal size (D), which have an elliptic shape of a half drop (half teardrop, cut across - longwise), in a special repeated pattern.
  • D uniform dimples of equal size
  • the dimples (D) occupy the entire hull surface and are arranged in vertical rows as to the imaginary longitudinal ax of the vessel (X) and the water flow (f).
  • the direction of each dimple (D) is parallel to the imaginary longitudinal ax of the vessel (X) and follows the water flow (f), in such a way so that the widest and deepest part of the dimple (head) (a) is towards the bow of the vessel (R), in front, in relation to the water flow (f), and the first to meet the water, while the narrower and shallower part of the dimple (tail) (b) is towards the stern of the vessel (E).
  • the dimensions (N - M) of the dimples (D), namely the opening - width and their depth, are defined according to the size and weight of the vessel, as well as to the speed at which we want to have the best performance (reduction of sliding friction factor) of the hull.
  • the above design / construction of the hull presents hydrodynamic characteristics of decreased friction, aims and achieves as a result the reduction of the resistance that is created during the movement of the high speed vessel by the sliding friction on the water.
  • the advantage is that while at the points where there is an increased water pressure, that is, in the front parts (head) (a) of the dimples towards the bow of the vessel (R), whirls with air pockets (ap) are created as well as a small water speed (P). At the points where high water speed is created, that is, in the rear parts (tail) (b) of the dimples (D) towards the stern of the vessel (E), there is a low water pressure (t). The result is the reduction of the sliding friction factor and the improvement on the vessel performance.
  • Figure 1 portrays a ground plan of a hull upside down whose surface is embossed and more specifically has uniform, of equal size dimples (D), which have elliptical shapes of half drops ((half teardrop, cut across - longwise), in a special repeated pattern.
  • the dimples (D) take up all or part of the hull surface and are arranged in vertical rows towards the imaginary longitudinal ax of the vessel (X) and the water flow (f).
  • each dimple is parallel to the imaginary longitudinal ax of the vessel (X) and follows the flow of the water (f), in such a way so that the widest and deepest part of the dimple (head) (a) is towards the bow of the vessel (R), in front, in relation to the water flow (f), and the first to meet the water, while the narrower and shallower part of the dimple (tail) (b) is towards the stern of the vessel (E).
  • the dimensions (N - M) of the dimples (D), namely the opening - width and their depth, are defined according to the size and weight of the vessel, as well as to the speed at which we want to have the best performance (reduction of sliding friction factor) of the hull. In figure 2.
  • a side view of the invention is portrayed, as it appears in a section of the embossed surface of the hull, where the widest and deepest part (head) (a) of the dimple is towards the bow of the vessel (R), in front, in relation to the water flow (f), and the first to meet the water, and the narrower and shallower part of the dimple (tail) (b) is towards the stern of the vessel (E).
  • Figure 3 schematically portrays the function of the invention during the movement of the vessel, that is, its hydrodynamic characteristics of reduced friction in relation to the water flow (f) and more specifically, there are portrayed, on the one hand the points where there is increased pressure and low speed (P), due to the whirls with air pockets, on the other hand the points where there is low pressure and increased speed (t), that is at the tails of the dimples (b).
  • the surface (water) on which the vessel is moving is a layer of reduced density and friction, which is created totally superficially and increases the speed performance with the same propulsive power, while it does not influence the propeller propulsion, which is moving in a lower - deeper level.
  • the supporting area of the hull surface that comes into contact with water is not reduced, which could lead to navigation instability.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Moulding By Coating Moulds (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Glass Compositions (AREA)

Abstract

With the construction of a high-speed vessel hull with embossed surface with dimples (D) (Dimpled Hull), we achieve a reduction of the sliding friction to an important degree, without influencing the sailing stability, while reducing significantly the fuel consumption and improving the performance. The production process of the hull for high-speed vessels with embossed surface with dimples (D) (Dimpled Hull) does not have any difference fro any other FIBER GLASS structure, as long as the mould has the particular relief design, in order to have it impressed on the hull of the vessel.

Description

HULL FOR HIGH-SPEED VESSELS OF EMBOSSED SURFACE WITH
DIMPLES
The invention concerns the design and construction of a high-speed vessel hull, whose surface is embossed. Namely, it presents dimples (D), in a specific repeated pattern (Dimpled Hull).
The rule applied so far to the design and construction of common hulls of high-speed vessels, requires that the surface of such a hull is as smooth as possible, in order to achieve a reduction of the friction factor, during its sliding on the water.
The disadvantage, of course, of the above rule, is that the water has a large interrelation, even with very smooth surfaces as it comes into contact with them. Consequently, the reduction of the friction which is sought through the smoothing of the hull surfaces has a very marginal improvement, that is, very small margins of further reducing the friction factor.
Therefore, with the design and construction technique of the hull that will be explained below (high-speed vessels embossed hull with hydrodynamic features of reduced friction), a reduced contact is generated between the water and the hull surface and consequently, a decreased friction. This is because, during the vessel's sliding, due to the proposed embossed hull form, a water surface of reduced density and friction is created, upon which the vessel slides, and consequently the sliding friction factor is reduced.
According to the present invention, the vessel's hull is characterized by its embossed surface, and more specifically has uniform dimples of equal size (D), which have an elliptic shape of a half drop (half teardrop, cut across - longwise), in a special repeated pattern.
The dimples (D) occupy the entire hull surface and are arranged in vertical rows as to the imaginary longitudinal ax of the vessel (X) and the water flow (f). The direction of each dimple (D) is parallel to the imaginary longitudinal ax of the vessel (X) and follows the water flow (f), in such a way so that the widest and deepest part of the dimple (head) (a) is towards the bow of the vessel (R), in front, in relation to the water flow (f), and the first to meet the water, while the narrower and shallower part of the dimple (tail) (b) is towards the stern of the vessel (E).
The dimensions (N - M) of the dimples (D), namely the opening - width and their depth, are defined according to the size and weight of the vessel, as well as to the speed at which we want to have the best performance (reduction of sliding friction factor) of the hull.
The above design / construction of the hull (invention) presents hydrodynamic characteristics of decreased friction, aims and achieves as a result the reduction of the resistance that is created during the movement of the high speed vessel by the sliding friction on the water.
According to the hydrodynamic principle (BERNOULLI), when a liquid flows (kinetic-dynamic) its pressure is inversely proportional to its speed.
Applying the above principle to the present described invention, namely creating a hull of embossed surface with dimples (D), we alternatively cause an increase and decrease of the water speed that comes into contact with the embossed surface (dimples) of the hull, and therefore we achieve a fluctuation on water pressure, without obstacles in the water flow, due to the small angle of water incidence at the rear part (tail) (b) of the dimple (D).
The advantage is that while at the points where there is an increased water pressure, that is, in the front parts (head) (a) of the dimples towards the bow of the vessel (R), whirls with air pockets (ap) are created as well as a small water speed (P). At the points where high water speed is created, that is, in the rear parts (tail) (b) of the dimples (D) towards the stern of the vessel (E), there is a low water pressure (t). The result is the reduction of the sliding friction factor and the improvement on the vessel performance.
Figure 1. portrays a ground plan of a hull upside down whose surface is embossed and more specifically has uniform, of equal size dimples (D), which have elliptical shapes of half drops ((half teardrop, cut across - longwise), in a special repeated pattern. The dimples (D) take up all or part of the hull surface and are arranged in vertical rows towards the imaginary longitudinal ax of the vessel (X) and the water flow (f). The direction of each dimple is parallel to the imaginary longitudinal ax of the vessel (X) and follows the flow of the water (f), in such a way so that the widest and deepest part of the dimple (head) (a) is towards the bow of the vessel (R), in front, in relation to the water flow (f), and the first to meet the water, while the narrower and shallower part of the dimple (tail) (b) is towards the stern of the vessel (E). The dimensions (N - M) of the dimples (D), namely the opening - width and their depth, are defined according to the size and weight of the vessel, as well as to the speed at which we want to have the best performance (reduction of sliding friction factor) of the hull. In figure 2. a side view of the invention is portrayed, as it appears in a section of the embossed surface of the hull, where the widest and deepest part (head) (a) of the dimple is towards the bow of the vessel (R), in front, in relation to the water flow (f), and the first to meet the water, and the narrower and shallower part of the dimple (tail) (b) is towards the stern of the vessel (E).
Figure 3. schematically portrays the function of the invention during the movement of the vessel, that is, its hydrodynamic characteristics of reduced friction in relation to the water flow (f) and more specifically, there are portrayed, on the one hand the points where there is increased pressure and low speed (P), due to the whirls with air pockets, on the other hand the points where there is low pressure and increased speed (t), that is at the tails of the dimples (b).
With this combination, at the points (p), which cover the largest part of the hull surface, we have a further layer of increased pressure, but of a very low water density, due to the whirls and the air pockets (ap) which are created, and on (t) points, where high speed is observed, we have a low water pressure.
Consequently, with the application of the present invention, the surface (water) on which the vessel is moving, is a layer of reduced density and friction, which is created totally superficially and increases the speed performance with the same propulsive power, while it does not influence the propeller propulsion, which is moving in a lower - deeper level. At the same time, the supporting area of the hull surface that comes into contact with water is not reduced, which could lead to navigation instability. The advantages of this invention are the following: i. Reduced fuel consumption ii. Better speed performance with the same propulsive power iii. Greater travel autonomy
Implementing the plan in the production process does not have any difference from any other FIBER GLASS structure, as long as the mould has a relief of the particular plan, in order to have it impressed on the hull of the vessel.

Claims

1. Hull for high-speed vessels characterized by its embossed surface with dimples (D).
2. The Hull for high-speed vessels of embossed surface with dimples (D), according to claim 1 , is characterized by its uniform and of equal size dimples, in an elliptic form of a half drop (a) and (b) (half teardrop, cut across - longwise.)
3. The Hull for high-speed vessels of embossed surface with dimples (D), according to claims 1 and 2, is characterized by its repeated horizontal
-JO dimple arrangement, parallel towards the imaginary ax of the vessel (X) and the water flow (f).
4. The Hull for high-speed vessels of embossed surface with dimples (D), according to claims 1 , 2 and 3, is characterized by the fact that the direction
•^5 of each dimple is parallel to the imaginary ax of the vessel (X) and follows the water flow (f), in such a way that the widest and deepest part of the dimple (head) (a) is headed towards the bow of the vessel (R), in front in relation to the water flow (f), and meets the water first, while the narrower and shallower part of the dimple (tail) (b) is headed towards the stern of the
20 vessel (E).
5. The Hull for high-speed vessels, according to claims 1 , 2, 3, and 4, is -characterized by the fact ihat ihe dimples (UX cover all the -surface of lhe hull, or a part of it, in a particular repeated pattern, i.e. they are arranged in
25 vertical rows as to the imaginary longitudinal ax of the vessel (X) and the water flow (f).
6. The Hull for high-speed vessels with embossed surface with dimples (D)1 according to the claims 1 , 2, 3, 4 and 5, is characterized by the fact that the dimensions (N - M) of the dimples (D), i.e. their opening - width and their depth, are each determined in relation to the size and the weight of the vessel, as well as to the speed with which we want to have the best performance (reduced sliding friction factor) of the hull.
PCT/GR2010/000014 2009-03-27 2010-03-26 Hull for high-speed vessels of embossed surface with dimples WO2010109252A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GR20090100179 2009-03-27
GR20090100179A GR1006986B (en) 2009-03-27 2009-03-27 High-speed craft's hull having relief surface with dimple depressions

Publications (2)

Publication Number Publication Date
WO2010109252A2 true WO2010109252A2 (en) 2010-09-30
WO2010109252A3 WO2010109252A3 (en) 2013-05-30

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WO (1) WO2010109252A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11427284B1 (en) * 2019-04-30 2022-08-30 Bombardier Recreational Products Inc. Personal watercraft hull

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB357637A (en) * 1930-06-27 1931-09-28 Peter Maurice Staunton Improvements in, or relating to ships, motor launches, and such like craft
DE19613304A1 (en) * 1996-04-03 1997-10-09 Ernst Koelle Upper surface structure for outer skin of bodies in flow medium
US20060251859A1 (en) * 2005-05-05 2006-11-09 D Urso Brian R Friction drag-reducing surface
EP2447153A1 (en) * 2010-10-28 2012-05-02 Zuei-Ling Lin Method of enhancing the output efficiency of a propeller and reducing the noise thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB357637A (en) * 1930-06-27 1931-09-28 Peter Maurice Staunton Improvements in, or relating to ships, motor launches, and such like craft
DE19613304A1 (en) * 1996-04-03 1997-10-09 Ernst Koelle Upper surface structure for outer skin of bodies in flow medium
US20060251859A1 (en) * 2005-05-05 2006-11-09 D Urso Brian R Friction drag-reducing surface
EP2447153A1 (en) * 2010-10-28 2012-05-02 Zuei-Ling Lin Method of enhancing the output efficiency of a propeller and reducing the noise thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11427284B1 (en) * 2019-04-30 2022-08-30 Bombardier Recreational Products Inc. Personal watercraft hull

Also Published As

Publication number Publication date
GR1006986B (en) 2010-09-27
WO2010109252A3 (en) 2013-05-30

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