US3675424A - Nozzle for ship{40 s propeller with water ejection along the trailing edge of the nozzle - Google Patents

Nozzle for ship{40 s propeller with water ejection along the trailing edge of the nozzle Download PDF

Info

Publication number
US3675424A
US3675424A US38077A US3675424DA US3675424A US 3675424 A US3675424 A US 3675424A US 38077 A US38077 A US 38077A US 3675424D A US3675424D A US 3675424DA US 3675424 A US3675424 A US 3675424A
Authority
US
United States
Prior art keywords
nozzle
trailing edge
water
propeller
slot
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.)
Expired - Lifetime
Application number
US38077A
Other languages
English (en)
Inventor
Marinus Willem Corn Oosterveld
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.)
Lips NV
Original Assignee
Lips NV
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 Lips NV filed Critical Lips NV
Application granted granted Critical
Publication of US3675424A publication Critical patent/US3675424A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • 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
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B63H5/15—Nozzles, e.g. Kort-type

Definitions

  • the present invention relates to a Kort noule for a ship's propeller with water ejection along the trailing edge of the nozzle.
  • the rate of flow in the region of the nozzle propeller compared with an open propeller can be accelerated as well as decelerated, dependent on the shape of the nozzle.
  • an increase in efficiency can be obtained.
  • the accelerating nozzle makes a positive contribution to the propelling force.
  • a pressure increase in the region of the propeller can be obtained, which in certain cases can suppress propeller cavitation.
  • the outlet surface of the nozzle increases relatively, the circulation around the nozzle increases, the nozzle makes a greater contribution to the propelling force and the efficiency of the system increases.
  • the load of the nozzle is limited by the possibility of structural failure at high loads.
  • FIG. I is a diagrammatic cross-sectional view of a ship's propeller having a Kort nozzle of the flow-decelerating type, and showing by the arrows the directions of water flow;
  • FIG. 2 is a view similar to FIG. 1 but showing an acceleratin g nozzle
  • FIG. 3 is a diagram of flow patterns corresponding to the various shapes of nozzle
  • FIG. 4 is a rear perspective view, with parts broken away, of a ship provided with a nozzle and propeller according to the present invention
  • FIG. 5 is a rear view of a ship's propeller and nozzle according to the present invention, indicating operation in a manner to augment the operation of an accelerating nozzle;
  • FIG. 6 is a cross-sectional view of the structure in FIG. 5;
  • FIG. 7 is a view similar to FIG. 5 but showing the structure operated for steering.
  • FIG. 8 is a cross-sectional view of the structure shown in FIG. 7.
  • the structure of the present invention is of the general type in which a ship's propeller l is encircled by a Kort nozzle 2 whose cross section or profile is in the form of a highlitt device, either positive or negative depending on whether a decelerating or an accelerating nozzle is desired. The difference is illustrated by comparison of FIGS. 1 and 2.
  • slots 4 are provided about the principal portion of the periphery of the inner side of the trailing edge of the nozzle 2', while slots 5 are provided about the principal portion of the outer periphery. Slots 4 communicate with one or more annular chambers 6 within the nozzle 2, while slots 5 communicate with one or more annular chambers 7 that are separate from chambers 6. Chambers 6 and 7 in turn communicate with conventional pumping apparatus (not shown) within the vessel through conventional ducts and valving apparatus (not shown so that water can be supplied by the pump under pressure selectively either to chambers 6 or to chambers 7, the pump intake being connected to the other of the chambers 6 and 7.
  • the pumping equipment sucks water in through on set of slots 4 or 5, and ejects it through the other.
  • the operation of the device as an accelerating nozzle is augmented; but when the direction of water flow is reversed and water is sucked in through slots 5 and ejected through slots 4, then the operation of the device as a decelerating nozzle is augmented.
  • FIGS. 7 and 8 It is also possible by selective operation of the valving means to effectuate the FIGS. 7 and 8 operation, in which at least one slot 4 on one side of the nozzle takes in water and at least one slot 4 on the opposite side of the nozzle ejects water; while the reverse is true for the associated slots 5. In this way, a steering function is achieved.
  • the angle between the direction of flow of the water through the slots 4 and 5 and the nozzle profile should be about 60.
  • the water velocity through the slots 4 and 5 should be about three to live times the intake velocity of the system (ship speed corrected for wake effect).
  • the present invention can be used also to maintain the flow of water in the region of the propeller substantially constant so that the propeller can operate with uniform velocity and full power under varying load conditions and sea conditions, the variation in conditions being accommodated by variations in water flow through the slots 4 and 5.
  • a noule for surrounding a ship's propeller said nozzle having a leading edge and a trailing edge defining between them a nozzle profile, there being at least one annular slot about the inner periphery of the trailing edge of the nozzle and at least one annular slot about the outer periphery of the trailing edge of the nozzle, means to move water through said at least one annular slot about the outer periphery of the trailing edge of the nozzle in a direction at an angle to said nozzle profile, and means simultaneously to move water in the opposite direction through said at least one annular slot about the inner periphery of the trailing edge of the nozzle at an angle to the nozzle profile which is opposite to said angle of said outer periphery slot whereby water moves in one direction through said outer periphery slot while simultaneously moving in the opposite direction through said inner periphery slot.
  • a nozzle for surrounding a ship's propeller means to eject water from the nonle along the trailing edge of the nozzle at an angle to the nozzle profile, said ejecting means comprising at least one annular slot about the trailing edge of the nozzle, there being at least one annular slot about the inner periphery of the trailing edge of the nozzle and at least one annular slot about the outer periphery of the trailing edge of the noule, and means for separately moving water through the inner periphery and outer periphery slots in different directions.
  • a nozzle for surrounding a ship's propeller means to eject water from the nozzle along the trailing edge of the noz- 0 bers in the nonle each zle at an angle to the male profile, said ejecting means comprising at least one annular slot about the trailing edge of the nozzle, said at least one slot being in the form of a plurality of separate slots disposed in end-to-end relation in a line about a periphery of the trailing edge of the nozzle, and means for separately supplying water to and withdrawing water from said slots.
  • a noule as claimed in claim 3, said supply and withdrawal means comprising a plurality of distribution chamindividual to a said slot.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Nozzles (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
US38077A 1969-05-19 1970-05-18 Nozzle for ship{40 s propeller with water ejection along the trailing edge of the nozzle Expired - Lifetime US3675424A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2550369 1969-05-19

Publications (1)

Publication Number Publication Date
US3675424A true US3675424A (en) 1972-07-11

Family

ID=10228758

Family Applications (1)

Application Number Title Priority Date Filing Date
US38077A Expired - Lifetime US3675424A (en) 1969-05-19 1970-05-18 Nozzle for ship{40 s propeller with water ejection along the trailing edge of the nozzle

Country Status (7)

Country Link
US (1) US3675424A (enrdf_load_stackoverflow)
CA (1) CA931436A (enrdf_load_stackoverflow)
DE (1) DE2024320A1 (enrdf_load_stackoverflow)
FR (1) FR2048491A5 (enrdf_load_stackoverflow)
GB (1) GB1308310A (enrdf_load_stackoverflow)
NL (1) NL7007222A (enrdf_load_stackoverflow)
NO (1) NO132721C (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858644A (en) * 1973-04-05 1975-01-07 Int Harvester Co Fan shroud exit structure
US3993015A (en) * 1973-10-19 1976-11-23 Janusz Klepacz Hydraulic jet propulsion system
US4003671A (en) * 1973-12-04 1977-01-18 Norges Skipsforskningsinstitutt Method and means to prevent cavitation erosion in propeller ducts
US5687670A (en) * 1996-02-07 1997-11-18 The United States Of America As Represented By The Secretary Of The Navy Circumferential circulation control system
US5727381A (en) * 1997-02-19 1998-03-17 The United States Of America As Represented By Secretary Of The Navy Duct flow control system
US20050245146A1 (en) * 2003-07-22 2005-11-03 Norman George I System and apparatus for improving safety and thrust from a hydro-drive device
US20060166571A1 (en) * 2005-01-24 2006-07-27 Norman George I Shroud for a hydro thrust device
US20060166570A1 (en) * 2004-07-22 2006-07-27 Norman George I System and apparatus for improving safety and thrust from a hydro-drive device
US20090084301A1 (en) * 2007-03-10 2009-04-02 Friedrich Mewis Device for reducing the drive power requirement of a ship
WO2025003284A1 (en) * 2023-06-27 2025-01-02 Uab Deeper Thruster for a vessel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029045A (en) * 1957-08-28 1962-04-10 Bertin & Cie Ejector systems applicable to thrust generation or augmentation
US3170284A (en) * 1962-11-19 1965-02-23 Monnich Herbert Screw propeller propulsion devices
US3214903A (en) * 1963-03-14 1965-11-02 Buehler Corp Jet boat nozzle
US3455268A (en) * 1966-10-13 1969-07-15 Samuel J Gordon Nonsymmetric shroud-propeller combination for directional control
US3499412A (en) * 1968-02-08 1970-03-10 Dravo Corp Kort nozzle
US3508517A (en) * 1967-02-20 1970-04-28 Kort Propulsion Co Ltd Nozzles or shrouds for ships' propellers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029045A (en) * 1957-08-28 1962-04-10 Bertin & Cie Ejector systems applicable to thrust generation or augmentation
US3170284A (en) * 1962-11-19 1965-02-23 Monnich Herbert Screw propeller propulsion devices
US3214903A (en) * 1963-03-14 1965-11-02 Buehler Corp Jet boat nozzle
US3455268A (en) * 1966-10-13 1969-07-15 Samuel J Gordon Nonsymmetric shroud-propeller combination for directional control
US3508517A (en) * 1967-02-20 1970-04-28 Kort Propulsion Co Ltd Nozzles or shrouds for ships' propellers
US3499412A (en) * 1968-02-08 1970-03-10 Dravo Corp Kort nozzle

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858644A (en) * 1973-04-05 1975-01-07 Int Harvester Co Fan shroud exit structure
US3993015A (en) * 1973-10-19 1976-11-23 Janusz Klepacz Hydraulic jet propulsion system
US4003671A (en) * 1973-12-04 1977-01-18 Norges Skipsforskningsinstitutt Method and means to prevent cavitation erosion in propeller ducts
US5687670A (en) * 1996-02-07 1997-11-18 The United States Of America As Represented By The Secretary Of The Navy Circumferential circulation control system
US5727381A (en) * 1997-02-19 1998-03-17 The United States Of America As Represented By Secretary Of The Navy Duct flow control system
US20050245146A1 (en) * 2003-07-22 2005-11-03 Norman George I System and apparatus for improving safety and thrust from a hydro-drive device
US6986689B2 (en) 2003-07-22 2006-01-17 Enviropropcorporation System and apparatus for improving safety and thrust from a hydro-drive device
US20060166570A1 (en) * 2004-07-22 2006-07-27 Norman George I System and apparatus for improving safety and thrust from a hydro-drive device
US7267589B2 (en) 2004-07-22 2007-09-11 Enviroprop Corporation System and apparatus for improving safety and thrust from a hydro-drive device
US20060166571A1 (en) * 2005-01-24 2006-07-27 Norman George I Shroud for a hydro thrust device
US7229331B2 (en) 2005-01-24 2007-06-12 Enviroprop Corporation Shroud for a hydro thrust device
US20090084301A1 (en) * 2007-03-10 2009-04-02 Friedrich Mewis Device for reducing the drive power requirement of a ship
US20090229506A1 (en) * 2008-03-10 2009-09-17 Becker Marine Systems Gmbh & Co. Kg Device for reducing the power demand for the propulsion of a ship
US8123578B2 (en) * 2008-03-10 2012-02-28 Becker Marine Systems Gmbh & Co. Device for reducing the power demand for the propulsion of a ship
US8430703B2 (en) 2008-03-10 2013-04-30 Becker Marine Systems Gmbh & Co. Kg Device for reducing the drive power requirement of a ship
WO2025003284A1 (en) * 2023-06-27 2025-01-02 Uab Deeper Thruster for a vessel

Also Published As

Publication number Publication date
FR2048491A5 (enrdf_load_stackoverflow) 1971-03-19
CA931436A (en) 1973-08-07
DE2024320A1 (de) 1970-11-26
NO132721C (enrdf_load_stackoverflow) 1975-12-22
NL7007222A (enrdf_load_stackoverflow) 1970-11-23
NO132721B (enrdf_load_stackoverflow) 1975-09-15
GB1308310A (en) 1973-02-21

Similar Documents

Publication Publication Date Title
US3016865A (en) Method and apparatus for reducing drag on submerged vehicles
US3675424A (en) Nozzle for ship{40 s propeller with water ejection along the trailing edge of the nozzle
US5720636A (en) Marine propulsor
US3793980A (en) Marine propulsion system
US3102389A (en) Hydrojet propulsion and control means for boats
US3805731A (en) Dual pump waterjet
US2764954A (en) Propulsion apparatus for water vessels
US3757728A (en) Guide vane for suction side of marine jet propulsion system
US2730065A (en) Hydraulic ship propulsion apparatus
US4509923A (en) Marine jet propulsion units
KR20160128337A (ko) 주 및 이차 추진 디바이스들에 의해 제공되는 선박 추진과 관련된 개선 사항들
US6629866B2 (en) Marine vehicle propulsion system
US3662702A (en) Multiple propeller ducted system
US3593686A (en) System for laterally maneuvering a watercraft hull
CN85100414A (zh) 高效射水船
US6024614A (en) High performance marine propulsion system
US1702222A (en) Propelling and maneuvering system for vessels
US3742893A (en) Water-jet propulsion and steering system for a multi-section prime-mover ship
US6164230A (en) Passive system for mitigation of thruster wake deficit
US3981262A (en) Water jet propulsion apparatus
US4666411A (en) Thrust augmenter
US4086867A (en) Boundary layer inlets and transverse mounted pumps for water jet propulsion systems
US1662206A (en) Propelling system and method
US3249165A (en) Simplified nozzle control for ground effect machines
US1543026A (en) Propelling system and method