GB2472797A - Twin hulled marine vessel with tapering air channel - Google Patents

Twin hulled marine vessel with tapering air channel Download PDF

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Publication number
GB2472797A
GB2472797A GB0914419A GB0914419A GB2472797A GB 2472797 A GB2472797 A GB 2472797A GB 0914419 A GB0914419 A GB 0914419A GB 0914419 A GB0914419 A GB 0914419A GB 2472797 A GB2472797 A GB 2472797A
Authority
GB
United Kingdom
Prior art keywords
longitudinal direction
vessel
hulls
cross
deck
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Withdrawn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
GB0914419A
Other versions
GB0914419D0 (en
Inventor
Minoo Patel
Adair Williams
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.)
Cranfield University
Original Assignee
Cranfield University
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 Cranfield University filed Critical Cranfield University
Priority to GB0914419A priority Critical patent/GB2472797A/en
Publication of GB0914419D0 publication Critical patent/GB0914419D0/en
Publication of GB2472797A publication Critical patent/GB2472797A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60V—AIR-CUSHION VEHICLES
    • B60V1/00—Air-cushion
    • B60V1/08—Air-cushion wherein the cushion is created during forward movement of the vehicle by ram effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60V—AIR-CUSHION VEHICLES
    • B60V3/00—Land vehicles, waterborne vessels, or aircraft, adapted or modified to travel on air cushions
    • B60V3/06—Waterborne vessels
    • B60V3/065—Waterborne vessels hulls therefor
    • 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
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • 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
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B1/121—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising two hulls
    • 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
    • B63B1/322—Other means for varying the inherent hydrodynamic characteristics of hulls using aerodynamic elements, e.g. aerofoils producing a lifting force
    • 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

Abstract

A marine vessel 8 has a front end 10 and a back end 12 defining between them a longitudinal direction D running from the front end to the back end. The vessel comprises two hulls 2 and 2' spaced in a direction transverse to the longitudinal direction and joined by a cross-deck 1, the facing surfaces 14 and 14' of the two hulls defining with a surface 16 of the cross-deck an air channel 18. At least part (20 and 20', Fig 3) of the facing surface of at least one of the two hulls tapers outwardly in the longitudinal direction. A part of both of the facing surfaces may taper outwardly while a second successive part in the longitudinal direction may taper inwardly in the longitudinal direction.

Description

TITLE: MARINE VESSEL
DESCRIPTION
TECHNICAL FIELD
The present invention relates to multi-hulled marine vessels.
BACKGROUND ART
Marine vehicles experience a resistance to motion, *:**: 20 which is in proportion to their forward velocity. The reduction of this resistive force is beneficial for the following reasons. Firstly, it will allow the vehicle to travel at greater speeds, f or the same engine thrust.
* Secondly, it will make the vehicle more efficient at any S.....
* 25 given speed, allowing for less fuel use over a given distance.
W093/21060 discloses the reduction of wave resistance and surface friction in a marine craft of the small waterplane area twin hull (SWATH) kind having a completely immersed fusiform twin hull from which project vertical support structures for a load platform. The load platform has a wing contour as its vertical longitudinal section which is suitable for producing an aerodynamic lift.
The use of a wing-like structure to join the hulls of a catamaran is also proposed by Doctors, L "Analysis of the efficiency of an ekranocat: A very-high-speed catamaran with aerodynamic alleviation". Royal Institution of Naval Architects, 1997, by Walker. G, Fougner. A, Younger. S, and Roberts. T. "Aerodynamics of high speed multihull craft" Fourth international conference on FAST, volume 1, pages 133-138, 1997 and by Matveev. K and Dubrovsky. V. "Aerodynamic characteristics of a hybrid trimaran model" Ocean Engineering, 34 (3-4) :616-620, March 2007.
DISCLOSURE OF INVENTION
According to the present invention, there is provided a marine vessel having a front end and a back end defining *...
therebetween a longitudinal direction running from the front end to the back end; the vessel comprising two hulls spaced in a direction transverse to the longitudinal direction and joined by a * cross-deck, the facing surfaces of the two hulls defining *.*.* * 25 with a surface of the cross-deck an air channel; wherein at least part of the facing surface of at least one of the two hulls tapers outwardly in the longitudinal direction By virtue of at least part of the facing surface of at least one of the two hulls tapering outwardly in the longitudinal direction, there is an increase in the cross-sectional area of the air channel adjacent that part of the facing surface. This increase has the effect of a diffuser, increasing the static pressure of air flowing through that part of the channel as a result of the forward motion of the vessel. This pressure acts in turn on the cross-deck to lift the vessel. As explained above, the lift provided will alleviate the weight of the craft, which in turn will reduce the hydrodynamic drag / frictional resistance of the craft as it passes through the water.
At least part of both facing surfaces of the two hulls may taper outwardly in the longitudinal direction.
Both facing surfaces may be symmetrical about the centre line of the vessel, at least for part of their length in the longitudinal direction. Successive parts of a facing surface in the longitudinal direction may have different degrees of taper. A first part of a facing surface may taper outwardly in the longitudinal direction while a second, successive part in the longitudinal direction may :.. taper inwardly in the longitudinal direction. The * transition between first and second successive parts of a *.*�S * 25 surface may be smooth and without any discontinuity.
As regards that surface of a hull facing away from the other hull, i.e. facing outwardly, this may also have parts that taper outwardly or inwardly in the longitudinal direction. The aerodynamic shaping of a marine vehicle in this fashion can also reduce the aerodynamic drag of the vehicle, that is, the profile and pressure drag of the part of the vessel moving through the air can be reduced.
The two surfaces of a hull, facing towards and away from the other hull respectively, may meet along a single line at the rear and/or along a single line at the front. The two surfaces of a hull together may define a wing profile / aerofoil section when viewed from above.
The cross-deck may also be configured to generate lift as the vessel moves forward through the air. The cross-deck may have a wing profile / aerof oil section when viewed from the side.
BRIEF DESCRIPTION OF DRAWINGS
An embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 is a perspective view of twin-hulled *1*S* embodiment of a vessel according to the present invention; Figure 2 is a side perspective view in the direction A indicated in figure 1, the vessel being sectioned vertically along its longitudinal axis to show the section of the cross deck; * * Figure 3 is plan sectional view taken through the S.....
* 25 hulls of the vessel of figure 1.
DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS
In Figure 1, a complete aerodynamic structure for a high-speed marine vehicle 8 is shown. The vessel has a front end 10 and a back end 12 defining therebetween a longitudinal direction D running from the front end to the back end. The vessel comprises two hulls 2,2' spaced in a direction transverse to the longitudinal direction and joined by a cross-deck 1. Each hull has a hydrodynamic portion -in the example shown a simple planing hull 3,3' -which may be adapted to suit the individual vehicle requirements.
In the embodiment shown, the vessel comprises a highly cambered wing section for the cross deck 1, with aerodynamic side hulls 2 of similar profile. The facing surfaces of the two hulls (indicated at 14 and 14' in figure 3) define with the lower surface of the cross-deck (indicated by arrows 16 in figures 1 and 2) an air channel 18 extending from the front to the back of the vessel.
The forward motion of the craft will result in an air flow around structures 2 and 3 and an air flow through the channel area bounded by 1, 2 and 3.
As shown in figure 3, a part 20,20' of each facing surface 14,14' of each hull 2,2' tapers outwardly in the longitudinal direction D, i.e. at an angle away from the * centre line CL of the vessel in the longitudinal direction S..
ID, as indicated by dashed lines 0 and 0'.
: As explained above, by virtue of at least part of the S.....
* 25 facing surface of at least one of the two hulls tapering outwardly in the longitudinal direction, there is an increase in the cross-sectional area of the air channel adjacent that part of the facing surface. This increase has the effect of a diffuser, increasing the static pressure of air flowing through that part of the channel as a result of the forward motion of the vessel. This pressure acts in turn on the cross-deck to lift the vessel.
Figure 3 is a cross section of the high-speed marine vehicle concept when viewed from above. The section shows the shaping of the side hulls 2. In particular, this illustrates the diffuser shape created by the side hulls.
The expansion of air as it passes into the area 18 bound by the cross deck 1 and side hulls 2 will result in high pressure, and thus lift.
As shown in figure 3, parts 20,20' both facing surfaces 14,14' of the two hulls taper outwardly in the longitudinal direction D. Indeed, both facing surfaces 14,14' are symmetrical about the vessel centre line CL (which is parallel to longitudinal direction D).
Successive parts of a. facing surface in the longitudinal s..' direction have different degrees of taper: referring to hull 2, first part 20 of facing surface 14 tapers outwardly in the longitudinal direction as indicated by dashed line 0 while a second part 22, further along the vessel in the longitudinal direction D may taper inwardly : in the longitudinal direction as indicated by dashed line I....
* 25 p. The transition between these first and second successive parts of a surface is, however, smooth and without any discontinuity.
As regards that surface 24,24' of a hull 2,2' facing away from the other hull, i.e. facing outwardly, this may also have parts 26 that taper outwardly, away from the centre line CL or inwardly (part 28), towards the centre line, in the longitudinal direction. The aerodynamic shaping of a marine vehicle in this fashion can also reduce the aerodynamic drag of the vehicle, that is, the profile and pressure drag of the part of the vessel moving through the air can be reduced. To this end, the inwardly and outwardly facing surfaces 14, 24 of each hull 2 meet along a single edge or line 30 at the rear and similarly meet along a single line 32 at the front. As is evident from figure 3, the inwardly and outwardly facing surfaces 14,24 of the hull 2 define together a wing profile I aerofoil section when viewed from above.
Figure 2 is a cross section of the cross deck 1, as viewed from the side of the vessel, illustrating the cambered wing profile chosen for this version of the design so as to generate lift as the vessel moves forward through the air. It can also be seen that the cross deck I...
is close to the ground and will therefore benefit from ground effect', that is, the additional performance * experienced by a wing flying in proximity to a surface. S..
This is a well established scientific phenomenon. It can * also be seen that the cross deck 1 joins smoothly to the *.. .. * * 25 side hulls 2, which in turn, are joined to respective hydrodynamic surfaces 3.
It should be understood that this invention has been described by way of examples only and that a wide variety of modifications can be made without departing from the scope of the invention. In particular, it will be apparent that the tapered hulls are independent of the cambered cross deck and can be implemented on their own, although the lifting effect is greatest when both tapered hulls and lifting cross-deck are combined. Similarly, the invention is applicable to multi-hulled craft in general and not only to the twin-hulled vessel of the example. J... * a a...
* .* ... * . * *4 a. *
h-.. I
I I..
I I, a. 4 I
I
I
0I**aI a
GB0914419A 2009-08-18 2009-08-18 Twin hulled marine vessel with tapering air channel Withdrawn GB2472797A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0914419A GB2472797A (en) 2009-08-18 2009-08-18 Twin hulled marine vessel with tapering air channel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0914419A GB2472797A (en) 2009-08-18 2009-08-18 Twin hulled marine vessel with tapering air channel

Publications (2)

Publication Number Publication Date
GB0914419D0 GB0914419D0 (en) 2009-09-30
GB2472797A true GB2472797A (en) 2011-02-23

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Family Applications (1)

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Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3016333A1 (en) * 2014-01-16 2015-07-17 Advanced Aerodynamic Vessels A2V MULTI-COASTAL VESSEL WITH MARINE PROPULSION
CN105730604A (en) * 2016-02-02 2016-07-06 深圳市海斯比船艇科技股份有限公司 Catamaran

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB608967A (en) * 1945-02-27 1948-09-23 Garfield Arthur Wood Improvements in or relating to boats or ships
US4008674A (en) * 1974-02-16 1977-02-22 Aktiengesellschaft "Weser" Catamaran vessel
GB1507342A (en) * 1974-04-11 1978-04-12 Riviere C Catamarans
WO1993021060A1 (en) * 1992-04-17 1993-10-28 Sabino Roccotelli Twin hull watercraft with aerodynamic-lift producing superstructure
US20040154514A1 (en) * 1999-09-01 2004-08-12 Burg Donald E. Air lubricated ship

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB608967A (en) * 1945-02-27 1948-09-23 Garfield Arthur Wood Improvements in or relating to boats or ships
US4008674A (en) * 1974-02-16 1977-02-22 Aktiengesellschaft "Weser" Catamaran vessel
GB1507342A (en) * 1974-04-11 1978-04-12 Riviere C Catamarans
WO1993021060A1 (en) * 1992-04-17 1993-10-28 Sabino Roccotelli Twin hull watercraft with aerodynamic-lift producing superstructure
US20040154514A1 (en) * 1999-09-01 2004-08-12 Burg Donald E. Air lubricated ship

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3016333A1 (en) * 2014-01-16 2015-07-17 Advanced Aerodynamic Vessels A2V MULTI-COASTAL VESSEL WITH MARINE PROPULSION
WO2015107125A1 (en) 2014-01-16 2015-07-23 Advanced Aerodynamic Vessels Marine propulsion multihull ship
US20160332700A1 (en) * 2014-01-16 2016-11-17 Advanced Aerodynamic Vessels Marine Propulsion Multihull Ship
AU2015206001B2 (en) * 2014-01-16 2017-11-23 Advanced Aerodynamic Vessels Marine propulsion multihull ship
CN105730604A (en) * 2016-02-02 2016-07-06 深圳市海斯比船艇科技股份有限公司 Catamaran

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Publication number Publication date
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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)