US3763818A - Method and apparatus for the recovery of waterjet power for marine vessels - Google Patents

Method and apparatus for the recovery of waterjet power for marine vessels Download PDF

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Publication number
US3763818A
US3763818A US00235895A US3763818DA US3763818A US 3763818 A US3763818 A US 3763818A US 00235895 A US00235895 A US 00235895A US 3763818D A US3763818D A US 3763818DA US 3763818 A US3763818 A US 3763818A
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United States
Prior art keywords
waterjet
primary
jet
vessel
aft
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Expired - Lifetime
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US00235895A
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English (en)
Inventor
H Davis
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Boeing Co
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Boeing Co
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    • 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

Definitions

  • ABSTRACT The method of improving the net thrust minus drag of y [52] US. Cl. 115/11, 60/222 3 marine Vessel at a given engine Performance y 51 1111.0 B63h 11/02 s seconda'ry jet flow consisting of a portion 58 Field 61 Search 115/11, 14; 60/221, of the p y j water, ambient water induced 60/222; 114/145 R by the primary jet water, and (3) ambient water captured by the ram action when forward motion is 5 References Cited achieved by the vessel.
  • the apparatus includes a duct having an inlet means 904,454 11/1908 Rolka .Q 115/11 mam! at a certain distance aft the Primary and 1,375,601 4/1921 Morilt 115/11 x an Outlet with nozzle means to augment in Producing 3,007,305 11/1961 Hamilton 115/14 x the secondaryjet- 3,342,032 9/1967 Cox et a1. 60/221 3,447,324 6/1969 French 115/14 X 7 Chin's 3 Drawing Figures FOREIGN PATENTS OR APPLICATIONS 2,502 0/1868 Great Britain 115/14 l z 3'2 l C I v 30 a; 24 Q 4 14 A?
  • the present invention is directed to marine vessels of the jet-propelled varietywherein means are utilized to expel a jet of water rearwardly of the vessel.
  • this invention it is contemplated to provide a secondary inlet and secondary exit nozzle aft ofthe primary nozzle.
  • the secondary inlet is located aft of the primary jet so as to receive a secondary water consisting of a portion of the primary water plus entrained ambient water.
  • the energy content of this secondary water consists of a portion of the entrainment plus ram energy contained in the primary jet in addition to a portion of ram energy resulting from craft motion (if any).
  • the present invention produces a secondary flow which is produced by 1. the ram action of the primary jet;
  • the present invention is related to a propulsion system for a marine vessel which is characterized by an aft-directed jet or stream of water emerging from a nozzle located next to the hull below the water surface.
  • An opening or secondary inlet which pierces the underside of the hull some distance aft of the nozzle outlet, captures a quantity of water flow which forms a secondary or auxiliary jet.
  • the quantity of this captured secondary flow is induced by three separate actions: the first consists of the ram action of the primary jet since it is aimed towards the secondary inlet; a second is the entrainment and shear action of the primary jet as it flows towards the secondary inlet, and the third is the ram action resulting from the forward motion of the marine vessel.
  • This invention is primarily directed toward the improvement of the takeoff performance of waterjetpropelled hydrofoils. However, the concept is general enough to be applicable to any type of water-borne craft.
  • the present invention improves the netthrust-minus-drag of-a marine vessel that employs a primary waterjet propulsion means, at a given power input, by the 'steps of creating a high kinetic energy region aft of the primary waterjet and retrieving part of the kinetic energy from that region, and thereafter utilizing that retrieved energy as secondary propulsion.
  • the retrieving of the kinetic energy comprises the capturing of a portion of the primary jet flow and a certain amount of ambient water aft of the primary nozzle and forming one combined secondary flow from both captured waters.
  • FIG. I is a side view of a hydrofoil vessel with a cutaway portion of the primary water propulsion jet and the secondary propulsion jet which encompasses the novel system and preferred embodiment of the present invention.
  • FIG. 2 is a stern view of the hydrofoil vessel illustrated in FIG. 1 and a typical location of the primary and secondary waterjet exit nozzles.
  • FIG. 3 is a diagram exemplifying the hydrofoil vessel drag during take-off and the thrust needed to become successfully foil-borne.
  • the present invention relates to improving the propulsion of marine vessels utilizing waterjet propulsion systems.
  • the present invention improves in addition the take-off mode towards foil-borne travel.
  • FIG. 1 illustrates a hydrofoil vessel 10 having a forward strut and foil arrangement 12 and an aft foil and strut arrangement 14 carrying a center water intake means 16.
  • a pump 18 with driving means 20 is mounted aboard the hydrofoil l and connected to the water intake means 16 by a duct 22, for pumping and accelerating the intake water out of the primary jet nozzle 24.
  • the primary water-jet mass 30 diffuses underneath the vessel 10. The diffusion action of the waterjet mass 30 shears and intermeshes with the ambient water 32 and together creates a large kinetic energy loaded water mass.
  • Inlet 40 which is located downstream of the primary nozzle 24, captures the secondary flow which consists of a portion of the primary jet and a certain amount of ambient water.
  • the secondary inlet 40 is positioned as low as possible so that air ingestion will not occur to disrupt the thrust augmentation when it is most needed.
  • the lowest point for the secondary inlet should be at the keel of the hydrofoil vessel. Since, in general, multiple secondary nozzles are involved, the positioning is symmetric and above the lowest keel surface while the positioning of the secondary inlet is preferably at the lowest keel so that air-inlet and air ingestion is prevented at the critical take-off point as shown and explained per FIG. 3.
  • the inlet means 40 may be provided with a less or a more projecting means so that less or more water volume is captured. Also, the inlet 40 may be located or formed so as to receive more ambient than direct primary jet water. The primary jet nozzle means could be controlled or set at a specific angle, all of which will produce certain changes.
  • waterjet propulsion means for marine vessels comprising submerged primary waterjet nozzle means which discharges a waterjet into an unconfined space beneath the hull of said vessel, a duct having an intake section and an exit section, said duct being mounted on said vessel at a predetermined location aft of said submerged primary waterjet nozzle means so that said intake section is adapted to receive a portion of said pri- 6.
  • a take-off thrust augmenting secondary water-jet system for hydrofoil vessels comprising:
  • a. submerged primary waterjet means which discharges a waterjet into an unconfined space beneath the keel surface of the vessel
  • said duct being mounted aft of said primary waterjet means such that said intake section is adapted to receive a portion of said primary waterjet and a certain amount of ambient water from said unconfined space,
  • said inlet section being located aft of said primary jet and essentially at said vessels lowest keel surface
  • said exit section being located above said lowest keel surface aft of said inlet section.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Cleaning In General (AREA)
  • Hydraulic Turbines (AREA)
US00235895A 1972-03-20 1972-03-20 Method and apparatus for the recovery of waterjet power for marine vessels Expired - Lifetime US3763818A (en)

Applications Claiming Priority (1)

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US23589572A 1972-03-20 1972-03-20

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US00235895A Expired - Lifetime US3763818A (en) 1972-03-20 1972-03-20 Method and apparatus for the recovery of waterjet power for marine vessels

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US (1) US3763818A (fr)
JP (1) JPS4912593A (fr)
GB (1) GB1375090A (fr)
IT (1) IT976928B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985094A (en) * 1976-02-20 1976-10-12 The United States Of America As Represented By The Secretary Of The Navy Series waterjet propulsion pumps for marine vehicles
US4461620A (en) * 1977-10-05 1984-07-24 Roland Brachet Propulsion device and a method of propelling a nautical vessel
US4989533A (en) * 1988-07-04 1991-02-05 Yamaha Hatsudoki Kabushiki Kaisha Support strut for hydrofoil craft
WO1995013962A1 (fr) * 1993-11-15 1995-05-26 Kvaerner Fjellstrand A/S Prise d'eau pour pompe de propulseurs a jet d'eau
US20070218783A1 (en) * 2006-03-15 2007-09-20 Steven Loui Lifting body water jet propulsion inlet inductor
NO20181547A1 (en) * 2018-11-30 2020-06-01 Norwegian Univ Sci & Tech Ntnu Propulsion for hydrofoil vessels
CN113086094A (zh) * 2021-04-21 2021-07-09 鹏城实验室 无人潜航器回收系统以及回收方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5978191U (ja) * 1982-11-17 1984-05-26 日立造船株式会社 水中翼船
JP2621985B2 (ja) * 1989-07-05 1997-06-18 川崎重工業株式会社 水中翼船の操舵装置
JP2831203B2 (ja) * 1992-07-01 1998-12-02 三菱重工業株式会社 ウォータージェット推進船

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US904454A (en) * 1908-05-27 1908-11-17 Ignatius B Rolka Boat propulsion.
US1375601A (en) * 1919-03-27 1921-04-19 Morize Ernest Propelling device for use on vehicles, marine vessels, or aircraft
GB287510A (en) * 1927-03-23 1928-10-22 Ex Engineering Company Improved means for effecting propulsion
AT111899B (de) * 1927-04-06 1928-12-27 Karl Jun Sam Schiffsantrieb.
US3007305A (en) * 1958-09-02 1961-11-07 C W F Hamilton & Company Ltd Marine propulsion apparatus
US3342032A (en) * 1966-06-29 1967-09-19 Clifford B Cox Jet propulsion means for a boat
US3447324A (en) * 1967-10-18 1969-06-03 Howard V French Water jet propulsion means

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US904454A (en) * 1908-05-27 1908-11-17 Ignatius B Rolka Boat propulsion.
US1375601A (en) * 1919-03-27 1921-04-19 Morize Ernest Propelling device for use on vehicles, marine vessels, or aircraft
GB287510A (en) * 1927-03-23 1928-10-22 Ex Engineering Company Improved means for effecting propulsion
AT111899B (de) * 1927-04-06 1928-12-27 Karl Jun Sam Schiffsantrieb.
US3007305A (en) * 1958-09-02 1961-11-07 C W F Hamilton & Company Ltd Marine propulsion apparatus
US3342032A (en) * 1966-06-29 1967-09-19 Clifford B Cox Jet propulsion means for a boat
US3447324A (en) * 1967-10-18 1969-06-03 Howard V French Water jet propulsion means

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985094A (en) * 1976-02-20 1976-10-12 The United States Of America As Represented By The Secretary Of The Navy Series waterjet propulsion pumps for marine vehicles
US4461620A (en) * 1977-10-05 1984-07-24 Roland Brachet Propulsion device and a method of propelling a nautical vessel
US4989533A (en) * 1988-07-04 1991-02-05 Yamaha Hatsudoki Kabushiki Kaisha Support strut for hydrofoil craft
WO1995013962A1 (fr) * 1993-11-15 1995-05-26 Kvaerner Fjellstrand A/S Prise d'eau pour pompe de propulseurs a jet d'eau
US20070218783A1 (en) * 2006-03-15 2007-09-20 Steven Loui Lifting body water jet propulsion inlet inductor
US7470161B2 (en) 2006-03-15 2008-12-30 Navatek, Ltd. Lifting body water jet propulsion inlet inductor
NO20181547A1 (en) * 2018-11-30 2020-06-01 Norwegian Univ Sci & Tech Ntnu Propulsion for hydrofoil vessels
CN113086094A (zh) * 2021-04-21 2021-07-09 鹏城实验室 无人潜航器回收系统以及回收方法

Also Published As

Publication number Publication date
GB1375090A (fr) 1974-11-27
IT976928B (it) 1974-09-10
JPS4912593A (fr) 1974-02-04

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