WO2024044142A1 - Système de propulsion et ses applications - Google Patents

Système de propulsion et ses applications Download PDF

Info

Publication number
WO2024044142A1
WO2024044142A1 PCT/US2023/030731 US2023030731W WO2024044142A1 WO 2024044142 A1 WO2024044142 A1 WO 2024044142A1 US 2023030731 W US2023030731 W US 2023030731W WO 2024044142 A1 WO2024044142 A1 WO 2024044142A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
convex surface
coupled
hull
liquid
Prior art date
Application number
PCT/US2023/030731
Other languages
English (en)
Inventor
Andrei Evulet
Original Assignee
Jetoptera, Inc.
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 Jetoptera, Inc. filed Critical Jetoptera, Inc.
Publication of WO2024044142A1 publication Critical patent/WO2024044142A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B69/00—Training appliances or apparatus for special sports
    • A63B69/12—Arrangements in swimming pools for teaching swimming or for training
    • A63B69/125—Devices for generating a current of water in swimming pools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/10—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing liquids, e.g. containing solids, or liquids and elastic fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H2011/002—Marine propulsion by water jets using Coanda effect, i.e. the tendency of fluid jets to be attracted to nearby surfaces

Definitions

  • propellers In maritime propulsion the typical method is the use of propellers driven by a motor.
  • the propellers vary from large to small, and sometimes dual motors are used for propelling a boat at lower speeds.
  • Motors are usually internal combustion or gas turbines turboshafts.
  • FIG. 1 is a cross-section of one embodiment of the present invention depicting only the upper half of an ejector and shows profiles of velocity and temperature within the internal flow;
  • FIG. 2 illustrates a cross-sectional portion of an ejector according to an embodiment
  • FIG. 3 illustrates a side perspective view of an ejector according to an embodiment
  • FIG. 4 illustrates a top view of a boat hull that does not employ an embodiment of the invention
  • FIG. 5 illustrates a top view of a boat hull that does employ an embodiment of the ejector
  • FIG. 6 illustrates a swimmer swimming in a recirculating swimming pool that includes one or more ejectors according to an embodiment
  • FIG. 7 illustrates a top view of the arrangement illustrated in FIG. 6.
  • An embodiment includes a propulsion system coupled to a vehicle.
  • a propulsion system coupled to a vehicle.
  • Such a system may include a diffusing structure and a conduit portion configured to introduce a primary fluid produced by the vehicle to the diffusing structure through a passage.
  • the passage is defined by a wall, and the diffusing structure comprises a terminal end configured to provide egress from the system for the introduced primary fluid.
  • a constricting element is disposed adjacent the wall.
  • An actuating apparatus is coupled to the constricting element and is configured to urge the constricting element toward the wall, thereby controlling the cross-sectional area of the passage.
  • Water pumped to higher pressures is injected at high speeds, and with the propulsion system immersed into the water at an offset from the ship’s hull in a manner that maximizes the entrainment of the water surrounding the hull, produces a relatively unidirectional stream while producing thrust and moving the vessel in the direction opposite to the water flow.
  • the system can be employed as integral to the ship’s hull and only deployed when needed, as for example, for a sailboat
  • the entire system can replace an outboard motor that drives a propeller.
  • the water pump can be driven electrically using a battery, a generator or a hybrid turboshaft, or a simple ICE or gas turbine.
  • such motors and devices are used in a swimming pool of limited size, creating a very steady, equal velocity profile current that allows a swimmer to swim against it.
  • the large amount of water entrained produces a very uniform stream without the variations in speeds created usually when using a propeller and flow straightener.
  • This method of propulsion is very efficient at high speeds required by the application (exceeding 30 knots), eliminates noise made by the propeller when chopping the water and can be also used to steer the boat by vectoring the jets, or reverse by using moveable surfaces to deflect the flow backwards. Such an approach can also eliminate the cavitation effect that typically limits the operation and performance of a ty pical propeller.
  • the amount of energy spent on board of a boat to produce a unit of thrust and move the boat forward is a measure of efficiency of the propulsion system onboard.
  • the metric of “propulsive efficiency” is used in aviation, and it is related to the difference between the speed of the aircraft and the speed of the fluid (e.g., jet) leaving the aircraft. When they are close to each other in value, the efficiency is high, but the thrust is diminished; conversely, when the jet speed is high and the aircraft velocity is much smaller, the efficiency is low - in effect too much kinetic energy' is not being used efficiently for propulsive reasons.
  • the streamlining of the flow around its hull is optimized and the system may also incur savings from the avoidance of dead water spots and stagnation of w ater in the wake. Integration of the hull with the water propulsion system according to one or more embodiments will lower its drag and streamline the flow around the hull.
  • a water pump pulls water from outside the hull of the vessel and filters the water of any debris or vegetation and directs the said water stream to an impeller or other known means of water pumping, raising the pressure to a value and flow rate needed for the propulsion device.
  • the device multiplies the amount of water supplied to it and ejects a mixture that, thanks to the shapes and architecture, multiplies the force produced by the primary jet of water were it to be deployed as a simple waterjet, without using an embodiment of the present invention.
  • a water pump draws water from a large pool and pressurizes the stream to a main flow that supplies a similar device, this time stationary and placed inside the pool at one end.
  • the profile of the velocity coming out of the device is more even or uniform than the use of the typical bladed rotors that generate a stream which is then spread out by use of a flow straightener, as in some of the products offered for swimming training.
  • the device can be also scaled up or down by size or numbers, offering a much larger set of options for the swimmer (larger and smaller combinations of thrusters can be shut off or on with primary water flow being supplied via a system of multiple conduits).
  • FIG. 1 illustrates a cross-section of only the upper half of an ejector 200 according to an embodiment.
  • Plenum 220 may be supplied with hotter-than-ambient fluid.
  • Pressurized motive fluid stream 600 communicates via conduits with primary nozzles 203 to the inner side of the ejector.
  • the primary nozzles accelerate the motive fluid 600 to the speed required by the ejector performance, per design of the primary nozzles 203.
  • the primary (motive) fluid 600 emerges at high speed over the Coanda surface 215 as a wall jet, entraining ambient fluid 1 which may be at rest or approaching the ejector at non-zero speed from the left of the figure.
  • the mix of the stream 600 and the ambient fluid 1 are moving purely axially at the throat section 225 of the ejector.
  • the mixing and smoothing out process continues so the profiles of temperature (750) and velocity in the axial direction (700) have no longer high and low values as they do at the throat section 225 but become more uniform at the exit of the ejector.
  • the temperature and velocity profiles are almost uniform.
  • FIG. 2 illustrates in cross-section, and FIG. 3 illustrates in side perspective view, the ej ector 200 according to an embodiment and illustrated in FIG. 1.
  • Ej ector 200 includes a diffusing structure 210 and a conduit portion, such as primary fluid area plenum 220.
  • Plenum 220 supplies primary fluid
  • an intake structure 230 provides secondary fluid, such as ambient fluid, to the diffusing structure 210 for mixing of the primary and secondary fluids therein.
  • the diffusing structure 210 comprises a terminal end configured to provide egress from the ejector 200 for the mixed primary and secondary fluids.
  • plenum 220 introduces the primary 7 fluid to a convex Coanda surface 215.
  • the primary fluid may consist of, for non-limiting example, pressurized water delivered to plenum 220 via a primary-fluid source, such as a duct 250.
  • Ejector 200 further includes a flow controller 240.
  • FIG. 4 illustrates a top view of a boat hull 400 that does not employ an embodiment of the ejector 200.
  • Hull 400 is moving in water and flow streamlines 410 resulting from such movement are shown as forming dead-water spots and stagnation of water in the wake area 420 aft of the hull thereby increasing drag forces acting on the hull.
  • FIG. 5 illustrates a top view of a boat hull 500 that does employ an embodiment of the ej ector 200.
  • Hull 500 is moving in water and flow streamlines 510 resulting from such movement are shown as being streamlined by ejector being positioned in the wake area 520 aft of the hull thereby decreasing drag forces acting on the hull.
  • Ejector 200 may be coupled to hull 500 by a strut 530 or other appropriate coupling device.
  • FIG. 6 illustrates a swimmer 600 swimming in a recirculating swimming pool 610 that includes one or more ejectors 200 employing a water pump 630 that provides water to the one or more injectors via, for example, one or more of ducts 250.
  • Flow streamlines 620 resulting from operation of ejector(s) 200 are shown as providing resistance to the swimmer 600 thereby causing pool 610 to function as an “endless swimming pool.”
  • FIG. 7 illustrates a top view of the arrangement illustrated in FIG. 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne un système de propulsion couplé à une partie arrière d'une coque d'un véhicule à flot, lequel système de propulsion comprend une surface convexe, une pompe configurée pour propulser un liquide, une structure de diffusion couplée à la surface convexe, au moins un conduit couplé à la surface convexe et configuré pour introduire dans la surface convexe un liquide primaire fourni par la pompe, et une structure d'admission couplée à la surface convexe et configurée pour introduire dans la structure de diffusion un liquide secondaire accessible au véhicule, la structure de diffusion comprenant une extrémité terminale configurée pour permettre une sortie du système pour le liquide primaire et le liquide secondaire introduits.
PCT/US2023/030731 2022-08-21 2023-08-21 Système de propulsion et ses applications WO2024044142A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263399705P 2022-08-21 2022-08-21
US63/399,705 2022-08-21

Publications (1)

Publication Number Publication Date
WO2024044142A1 true WO2024044142A1 (fr) 2024-02-29

Family

ID=90013853

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2023/030731 WO2024044142A1 (fr) 2022-08-21 2023-08-21 Système de propulsion et ses applications

Country Status (1)

Country Link
WO (1) WO2024044142A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6881110B1 (en) * 2003-03-03 2005-04-19 Siemens Aktiengesellschaft High-speed vessel powered by at least one water jet propulsion system without exhaust gas trail
WO2008017916A2 (fr) * 2006-08-11 2008-02-14 Calzoni S.R.L. Système de propulsion nautique pour navigation en surface et/ou sous l'eau
WO2018232460A1 (fr) * 2017-06-21 2018-12-27 Advance Fluid Systems Pty Ltd Système de propulsion pulsé et procédé de propulsion d'un bateau
US20190390925A1 (en) * 2018-06-22 2019-12-26 General Electric Company Fluid eductors, and systems and methods of entraining fluid using fluid eductors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6881110B1 (en) * 2003-03-03 2005-04-19 Siemens Aktiengesellschaft High-speed vessel powered by at least one water jet propulsion system without exhaust gas trail
WO2008017916A2 (fr) * 2006-08-11 2008-02-14 Calzoni S.R.L. Système de propulsion nautique pour navigation en surface et/ou sous l'eau
WO2018232460A1 (fr) * 2017-06-21 2018-12-27 Advance Fluid Systems Pty Ltd Système de propulsion pulsé et procédé de propulsion d'un bateau
US20190390925A1 (en) * 2018-06-22 2019-12-26 General Electric Company Fluid eductors, and systems and methods of entraining fluid using fluid eductors

Similar Documents

Publication Publication Date Title
US6581537B2 (en) Propulsion of underwater vehicles using differential and vectored thrust
EP0657348B1 (fr) Propulseur à jet d'eau
US3273333A (en) Water jet propulsion device
US7052339B2 (en) Propulsion system for a fast seagoing ship, especially a naval ship
KR101258935B1 (ko) 추진 장치와 이를 갖는 선박
US3265027A (en) Propulsor
JP6493826B2 (ja) 流体機械及び推進装置、流体機械のウォータージェット推進機。
EP1582456B1 (fr) Dispositif de mélange sous-pression de gaz d'échappement de vaisseau
JP7334339B2 (ja) 艦船の航行時の造波抵抗及び摩擦抵抗を低減する方法及び装置
KR100700234B1 (ko) 프로펠러 추진 시스템과는 별도로 선박 아래쪽에 하나 이상의 워터제트를 갖는 대형 고속 해상 선박의 작동 방법, 및 선박 아래쪽에 배치되는 워터제트를 갖는 대형 고속 해상 선박의 작동 방법을 실시하기 위한 추진장치
US7913485B2 (en) Dual mode propulsion system
CN108639297A (zh) 一种适用于高性能船的高效低噪混合推进装置及方法
JP2007210537A (ja) ウォータージェット推進船
JP2017501083A (ja) 船舶用の推進ユニット
WO2008009302A1 (fr) Dispositif mécanique à dynamique de fluide pour la propulsion et la régulation de l'écoulement dans des bateaux propulsés par hydrojet
WO2024044142A1 (fr) Système de propulsion et ses applications
US3722454A (en) Thrust augmenter
WO2018232460A1 (fr) Système de propulsion pulsé et procédé de propulsion d'un bateau
JP3767726B2 (ja) 潜水艇
JP3243483B2 (ja) ウォータージェット推進機
JPH0582795U (ja) ブースター付ウォータジェット推進機
KR102416631B1 (ko) 제트펌프 추진체가 구비되는 선박
JPH04293693A (ja) ウォータジェット推進装置
CN214524355U (zh) 一种空气喷气推进器
RU2228873C2 (ru) Способ повышения пропульсивных качеств судов при создании тяги

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23857959

Country of ref document: EP

Kind code of ref document: A1