WO2018232460A1 - Système de propulsion pulsé et procédé de propulsion d'un bateau - Google Patents

Système de propulsion pulsé et procédé de propulsion d'un bateau Download PDF

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Publication number
WO2018232460A1
WO2018232460A1 PCT/AU2018/050618 AU2018050618W WO2018232460A1 WO 2018232460 A1 WO2018232460 A1 WO 2018232460A1 AU 2018050618 W AU2018050618 W AU 2018050618W WO 2018232460 A1 WO2018232460 A1 WO 2018232460A1
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WO
WIPO (PCT)
Prior art keywords
passageway
propulsion system
gas
fluids
outlet
Prior art date
Application number
PCT/AU2018/050618
Other languages
English (en)
Inventor
Peter Mastalir
Original Assignee
Advance Fluid Systems Pty Ltd
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
Priority claimed from AU2017902380A external-priority patent/AU2017902380A0/en
Application filed by Advance Fluid Systems Pty Ltd filed Critical Advance Fluid Systems Pty Ltd
Publication of WO2018232460A1 publication Critical patent/WO2018232460A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/09—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps by means of pressure pulses applied to a column of liquid, e.g. by ignition of an air/gas or vapour mixture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/12—Marine propulsion by water jets the propulsive medium being steam or other gas
    • B63H11/14—Marine propulsion by water jets the propulsive medium being steam or other gas the gas being produced by combustion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/24—Arrangements, apparatus and methods for handling exhaust gas in outboard drives, e.g. exhaust gas outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • B63H2005/1254—Podded azimuthing thrusters, i.e. podded thruster units arranged inboard for rotation about vertical axis
    • 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
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system

Definitions

  • the present invention relates to the propulsion of watercraft.
  • it concerns a propeller-less method of propulsion with limited external moving parts.
  • propulsion is achieved by release of rapid pulsations from an outlet of a submerged unit, including without limitation, in combination with the submerging liquid namely, fresh or seawater, air, exhaust gas and/or steam under pressure to constitute pulsed propulsive thrust.
  • the invention utilises microbubbles of gas as a surface 'lubricant' to alter the density of fluid at the wetted surfaces of the submerged propulsion unit or pod. This alters the surface topology from being completely wet to having a hybrid gas and liquid boundary layer of invariably lower density contributing to a significant reduction in surface induced drag to maximise or optimise the resultant thrust.
  • US 2009/0098782 A1 discloses a two phase water jet propulsion system for high-speed watercraft utilising the exhaust gas of an engine driving a water pump used to increase the flow rate of a water jet.
  • the use of exhaust gases to improve propulsion is also known in prior art propeller driven systems wherein an exhaust outlet is entrained in the negative or low pressure region located just aft of the propeller.
  • the overriding advantage is derived from creating a low pressure exhaust system to improve engine breathing and volumetric efficiency rather than any net increase in mass output or flow to augment thrust.
  • none of the relevant prior art located is directed to or teaches the use of rapid pressure pulsations to actually augment or comprise propulsive thrust.
  • the invention resides a submerged pulsated propulsion system for watercraft comprising a passageway defined by an inlet at one end and an outlet at an opposite end, the inlet and outlet respectively adapted for the ingress and egress of a first fluid, one or more compressors for compressing one or more other fluids in a pressurised state released as pulsations into the passageway downstream of the inlet and in the direction of the outlet, and wherein in combination with the first fluid, increased flow and changes to the density of total fluid volume ejected as pulses under pressure at the outlet, constitutes propulsive thrust.
  • the one or more other fluids in a pressurised state is of a different specific gravity to that of the first fluid such that the density of their combination is less than that of the first fluid, and wherein as a result, the velocity of the combined fluid flowing through the passageway is increased over that solely of the first fluid.
  • the first fluid is the liquid the propulsion system is submerged in and preferably, the one or more other fluids in a pressurised state is a gas wherein the combined fluid mixture acts as a surface lubricant and as a result, the velocity of the combined fluid flowing through the passageway is increased over that solely of the first fluid.
  • the propulsion system has a shape and configuration of a unit or pod attached to or extending from a hull of the watercraft. As a preferred embodiment, where the unit or pod is an attachment to the hull, it could also assume the configuration of an outboard motor.
  • the propulsion system may be incorporated into the form, design or configuration of a hull of the watercraft itself.
  • the one or more compressors is preferably located on board the watercraft and in communication with one or more flow control valves; the control valves adapted to control release of the pressurised other fluids into the passageway.
  • the one or more other fluids preferably includes high pressure water injected into the passageway between the inlet and the outlet in the same direction as another fluid which is typically a gas. Atmospheric gases may also be utilised to reduce surface layer boundary friction as well as to modify the fluid density in and around the pod.
  • the propulsion system herein disclosed generates thrust that may be utilised to propel the watercraft.
  • the first fluid is water the propulsion system is submerged in, and the one or more other fluids is a gas, bubbles, including microbubbles are formed as a consequence of the decompression of the gas when released in the water.
  • the microbubbles act as a lubricant for one or more of the wetted surfaces of the passageway to encourage boundary layer lamina flow which minimises or reduces surface or skin drag.
  • water is injected into the passageway at high pressure
  • the high pressure water outlet may be positioned on an interior surface of the passageway adjacent the inlet.
  • the high pressure water outlet may comprise an inner circumferentially positioned outlet.
  • the other fluid is typically a gas
  • the gas outlet for the pressurised gas may be on an internal surface of the passageway adjacent the inlet.
  • the gas outlet may comprise an inner circumferential gas outlet.
  • the gas outlet preferably comprises rifling gas nozzles, and may be configured to generate an interior layer of gas bubbles over at least a portion of the internal surface of the passageway.
  • the interior layer may also comprise a reduced density mixture of the gas and water. The interior layer when so formed may extend from the inlet to the outlet of the passageway.
  • the gas outlet arrangement may be configured such that when the propulsion system is submerged and gas is introduced into the passageway, a mixture of the gas and water is formed within and restricted to the confines of the passageway.
  • the internal sides or walls of the passageway are parallel.
  • the passageway has a tapering internal configuration between the inlet and the outlet such that a venturi effect is induced to speed the flow of fluid.
  • a tapered configuration is likely to cause the gas and water mixture to accelerate as it moves through the passageway, an increase in overall thrust is experienced at the outlet.
  • the gas outlet is located on an external surface of the passageway.
  • the gas outlet on the external surface may be configured to generate an exterior layer of the gas over at least a portion of the external surface.
  • the exterior layer may also comprise a less dense mixture of the gas and water.
  • the external gas outlet may comprise an outer circumferential gas outlet associated with the external surface of the propulsion unit or pod.
  • the passageway may have an annular configuration.
  • the passageway may be a tubular or an elongated passageway centrally positioned along the watercraft.
  • Another embodiment can include a stalk from which the propulsion unit or pod depends.
  • the stalk may contain a gas conduit in communication with a gas inlet and a gas outlet.
  • the stalk may also house a high pressure water conduit in communication with a high pressure water inlet and an outlet.
  • the position and location of the propulsion system is adjustable with respect to a hull of the watercraft to provide propulsive thrust in any direction so desired.
  • one or more propulsion units or pods may be arranged so as to be operational as a steering, positioning and/or braking mechanism of the watercraft.
  • the invention resides in a method of propelling watercraft, the method comprising the steps of (i) coupling to the watercraft a propulsion system as herein described, (ii) submerging the propulsion system in the water, (iii) generating one or more fluids in a pressurised state, and (iv) releasing the pressurised one or more fluids in pulsations into the passageway, wherein increased fluid volume and flow being ejected as pressure pulses at the outlet, propels the watercraft.
  • One example of the method includes the step of driving an air compressor with a combustion engine. Exhaust gas from the combustion engine may be contained and passed over gas pipework through which the pressurised gas travels. This can increase the pressure of the gas by heat transfer from the exhaust gas.
  • the gas in the pressurised state may comprise air or exhaust gas or a combination of air and exhaust gas from the combustion engine.
  • the pressurised air or exhaust gas or a combination of air and exhaust gas comprises the one or more other fluids released as pulsations into the passageway.
  • Another embodiment uses an electric motor arranged to power the air compressor.
  • the one or more other fluids in the pressurised state comprises steam.
  • the generation of steam may include the step of operating a boiler to generate the steam.
  • Another method includes the step of storing gas in the pressurised state in a pressure vessel and communicating the pressurised gas from the pressure vessel to an outlet.
  • An important control function includes the step of adjusting the flow of the gas in the pressurised state. Adjusting the flow of the pressurised gas may include the step of operating a flow control valve wherein the flow rate and the frequency of the pulsations can be adjusted. The one or more other fluids are released in the form of pulses into the passageway to resulting in a pulsed propulsive thrust at the outlet.
  • the invention resides in the watercraft itself that includes a propulsion system and is propelled by a method of propulsion in accordance with that described in the aforementioned discussion.
  • the invention resides in the watercraft itself that includes a propulsion system and is propelled by a method of propulsion in accordance with that described in the aforementioned discussion.
  • Figure 1 shows a perspective view of a preferred propulsion unit according to the invention
  • Figures 2, 3 and 4 show respectively, plan, front elevational and side elevational views of the propulsion unit of Figure 1 ;
  • Figure 5 shows a section A-A through the view of Figure 2;
  • Figure 6 shows a schematic diagram of an example of a gas source in fluid communication with the propulsion unit of Figure 1;
  • Figure 7 shows a schematic drawing of an embodiment wherein an electric motor is used to power an air compressor and a water pump;
  • Figure 8 shows an embodiment in the configuration of an outboard motor
  • Figures 9 and 10 show a pod attached to or extending from a hull of a watercraft. Description of Embodiments
  • FIGS 1 to 7 show various views and examples of a propulsion system for watercraft, in accordance with the invention, the propulsion system being generally indicated by the numeral 10.
  • Figures 2, 3 and 4 show orthographic views of the pod 10 of Figure 1. Wherever possible, the same numbering system has been replicated between drawings in the interests of better understanding and avoiding ambiguity.
  • the propulsion unit or pod 10 has a passageway 12 that is submersible in water 14.
  • the passageway 12 has a first end or inlet 16 (or "leading end") and a second end or outlet 18 (or “trailing end”).
  • the passageways 22, 23 and 24 are attached to the watercraft by stalk 38 housing three inlets to receive air 56, high pressure water 58 and exhaust gas 60.
  • high pressure water 58 has a pressure significantly above atmospheric pressure, for example in this embodiment around seven (7) bars.
  • the high pressure water 58 exits outlet 31 with significant higher velocity. This induces the entrainment or draw of inlet water
  • the pod 10 has at least one gas outlet. In this embodiment there are three gas outlets 28, 30 and 33 directed rearwards towards the second or trailing end 18, however other embodiments may have less or more than three gas outlets.
  • the internal gas outlet 28 is configured for the egress of air 56 drawn in the direction of the second end or outlet 18.
  • the external gas outlet 30 is configured for the egress of air 56 in the drawn state over external surface 32 of pod 10 in the direction of the second end or outlet 18.
  • the gas outlet 33 receives pulsed and pressurized exhaust gas 60 through inlet 24. When released into passageway 12, it results in a hybrid fluid of water and gas which is of less density in a pulsed condition.
  • This compressible fluid 53 allows higher density fluid slug 55 to accelerate thereby contributing to thrust 13.
  • the pod 10 is of a tapered annular configuration. However, in other embodiments, the pod 10 can be any other suitable shape or configuration.
  • the pod 10 has an internal surface 34.
  • the internal surface 34 defines passageway 12 in the form of a tubular or circular passageway.
  • the passageway 12 is defined in the form of a tubular or circular passageway.
  • Gas outlet 28 is arranged for the introduction of the air 56 in the drawn state into the passageway.
  • Gas outlet 28 is located on the internal surface and adjacent the inlet or first end 16.
  • gas outlet 28 is in the form of a plurality of gas nozzles 36 orientated rearwards and towards the outlet or second end 18.
  • the air 56 when introduced into the passageway forms an interior layer over at least a portion of the internal surface 34 extending from adjacent the inlet or first end 16 to adjacent the outlet or second end 18.
  • the mixture of air and liquid is of lessened density resulting in a reduction of drag, which as a consequence optimizes or maximizes net fluid thrust at outlet 18.
  • the passageway 12 tapers towards the outlet 18 at the second end. Consequently, the mixture of gas and water within the passageway is (under the combined gas law) is caused to accelerate as it travels from the inlet 16 to the outlet 18 which thus increases thrust 13.
  • Fluid entering the passageway at 12 due to the velocity differential of fluid flowing between the inlet and the outlet, creates a pressure differential between the inlet and outlet which causes a draw or Bernoulli venturi effect when starting from rest. Because the propulsion unit 10 experiences less drag than with a propeller, fuel economy and/or thrust is improved also.
  • gas outlet 30 is configured for the egress of gas 56 in the pressurized state.
  • the gas is directed in the direction of the outlet 18.
  • another gas outlet 30 can be configured for the egress of the gas 56 in the pressurized state normal to an external surface 32 of pod 10.
  • the gas may leave outlet 30 in any suitable direction to propel and steer the watercraft (not shown) accordingly.
  • the gas outlet 30 is located on the external surface 32.
  • Gas outlet 30 is configured to generate an exterior layer 15 comprising gas and water over the external surface.
  • the gas outlet on the external surface is in the form of an outer circumferential gas outlet.
  • Gas outlet 30 comprises a plurality of gas nozzles, but it need not be so.
  • the exterior layer extends from adjacent the first end 16 to adjacent the second end 18.
  • a coating of air or a mixture of air and water may be applied to the external surface 32 of the submerged component to reduce drag, increases thrust and resultant fuel economy.
  • the propulsion unit 10 with inlets 22, 23 and 24 depends from the stalk 38.
  • the stalk 38 has gas conduits in the form of an internal gas conduits in communication with the gases 56 and 60.
  • the propulsion unit 10 may be mounted on the watercraft.
  • the stalk descends from a hull of the watercraft.
  • the passageway may be integral with the hull, in which the passageway may be of an oval-like cross-section.
  • the stalk may be configured for attachment to a bow, transom or gunwale of the watercraft.
  • the stalk can have mounting means in the form of screw clamps, lever clamps, and/or an attachment plate with through holes for fasteners in the form of screws, rivets or generally any suitable fasteners.
  • the propulsion system when attached to or extending from a hull of the watercraft on a stalk, preferably is movable and able to be positioned to provide propulsive thrust in any direction so desired.
  • One or more propulsion units or pods may be arranged so as to be operational as a steering, positioning and/or braking system of the watercraft. This application would be highly useful in the case of large vessels which are difficult to steer, slow down or dock wherein a number of strategically located propulsion units may be coordinated in manoeuvring the vessel.
  • FIG. 6 shows a schematic diagram of an example of exhaust gas source 60 from an internal combustion engine 46 arranged to provide the pressurized and pulsed state in communication with the propulsion unit 10.
  • the internal combustion engine 46 is generally mounted on or within the water vessel, for example within the hull.
  • a pump 54 is attached and driven by the internal combustion engine 46.
  • Intake 27 supplies water 14 for pump 54.
  • Pump 54 generates high pressure water 58 which creates high velocity water flow at outlet 31. This initiates draw of inlet water 11 which in turn initiates air draw 56 through outlet 28.
  • Forward motion of pod 10 over surface 32 initiates additional draw of air through outlet 30. Due to the normal operation of the internal combustion engine, exhaust gas 60 is delivered pulsated and under pressure.
  • This pressurized and pulsed exhaust gas 60 is fed from outlet 33 into chamber 12 in the direction of outlet 18.
  • Each pulse creates a higher density fluid slug 55 when the internal combustion engine 46 is between exhaust strokes.
  • the compressible fluid 53 allows the slug 55 to accelerate when the exhaust gas 60 exits outlet 33. This acceleration contributes to thrust 13.
  • pulsed gas can be controlled by an additional valve which allows for greater variable control of the pulse frequency and pressure.
  • Figure 7 shows a schematic drawing of an embodiment of a propulsion unit 10 wherein an electric motor 47 is used to power an air compressor 44 and a water pump 54.
  • Compressed air 60 and water 58 under high pressure is released as fluid pulses, with air 56 at ambient pressure, drawn into passageway 12.
  • the air 56 is released via outlets 28 and 30 into the water 14 wherein it forms a hybridized liquid gas mixture 15 which reduces the drag on the pod's surfaces internal 34 and external 32.
  • Compressed air 60 exits outlet 33 in a pulsed and pressurized condition.
  • the function of this method is similar to the use of exhaust gas of the internal combustion method of Figure 6.
  • Compressed air 60 in Figure 7 replaces exhaust gas 60 in Figure 6.
  • a configuration where air drawn under ambient atmospheric pressure through outlets 28 and 30 is replaced by pressurized air, with or without pulsation could be used in any of the above embodiments to suit specific applications for drag reduction or propulsion enhancement.
  • Figure 8 shows an embodiment in the configuration of an outboard motor 62 attached to the transom 64 of a boat 66. Propulsion and steering are thus taken care of by the propulsion.
  • the propulsion unit has a shape and configuration of a pod 10 attached to or extending from a hull 72 of the watercraft.
  • the pod 10 is attached to or extends from hull 72 by a stalk 74 is movable and able to be positioned (broken line 76, arrow 78) to provide propulsive thrust in any direction so desired.
  • one or more propulsion units or pods may be arranged so as to be operational as a steering, positioning and/or braking system of the watercraft.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne un système immergé de propulsion pulsé destiné à un bateau comprenant un passage défini par une entrée à une extrémité et une sortie à une extrémité opposée, l'entrée et la sortie étant respectivement conçues pour l'admission et l'évacuation d'un premier fluide. L'invention concerne également un ou plusieurs compresseurs destinés à comprimer un ou plusieurs autres fluides. Dans un état sous pression, ledit autre fluide est libéré sous forme de pulsations dans le passage en aval de l'entrée et en direction de la sortie. En combinaison avec le premier fluide, cela augmente l'écoulement et modifie la densité du volume de fluide total qui est éjecté de la sortie sous forme d'impulsions sous pression, et constitue une poussée de propulsion. L'invention concerne en outre un bateau et un procédé de propulsion d'un tel bateau.
PCT/AU2018/050618 2017-06-21 2018-06-21 Système de propulsion pulsé et procédé de propulsion d'un bateau WO2018232460A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2017902380 2017-06-21
AU2017902380A AU2017902380A0 (en) 2017-06-21 A pulsated propulsion system and method of propelling a watercraft

Publications (1)

Publication Number Publication Date
WO2018232460A1 true WO2018232460A1 (fr) 2018-12-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024044142A1 (fr) * 2022-08-21 2024-02-29 Jetoptera, Inc. Système de propulsion et ses applications

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001079060A1 (fr) * 2000-04-18 2001-10-25 Helmut Schiller Dispositif de propulsion par reaction pour bateaux
WO2003101820A1 (fr) * 2002-05-29 2003-12-11 Siemens Aktiengesellschaft Systeme d'entrainement pour vaisseau marin rapide, notamment pour navire de guerre
WO2008009302A1 (fr) * 2006-07-19 2008-01-24 Leo Capital Partners Fund Spc, Dispositif mécanique à dynamique de fluide pour la propulsion et la régulation de l'écoulement dans des bateaux propulsés par hydrojet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001079060A1 (fr) * 2000-04-18 2001-10-25 Helmut Schiller Dispositif de propulsion par reaction pour bateaux
WO2003101820A1 (fr) * 2002-05-29 2003-12-11 Siemens Aktiengesellschaft Systeme d'entrainement pour vaisseau marin rapide, notamment pour navire de guerre
WO2008009302A1 (fr) * 2006-07-19 2008-01-24 Leo Capital Partners Fund Spc, Dispositif mécanique à dynamique de fluide pour la propulsion et la régulation de l'écoulement dans des bateaux propulsés par hydrojet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024044142A1 (fr) * 2022-08-21 2024-02-29 Jetoptera, Inc. Système de propulsion et ses applications

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