US3738307A - Propeller nozzle - Google Patents

Propeller nozzle Download PDF

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Publication number
US3738307A
US3738307A US00149740A US3738307DA US3738307A US 3738307 A US3738307 A US 3738307A US 00149740 A US00149740 A US 00149740A US 3738307D A US3738307D A US 3738307DA US 3738307 A US3738307 A US 3738307A
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US
United States
Prior art keywords
propeller
nozzle
profile
zone
profiles
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
US00149740A
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English (en)
Inventor
G Jacobsen
A Mollevik
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.)
STROMMEN STRAAL STROMMEN RAUFO
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STROMMEN STRAAL STROMMEN RAUFO
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 STROMMEN STRAAL STROMMEN RAUFO filed Critical STROMMEN STRAAL STROMMEN RAUFO
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Publication of US3738307A publication Critical patent/US3738307A/en
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Expired - Lifetime legal-status Critical Current

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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
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • 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
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
    • B64C11/001—Shrouded propellers

Definitions

  • This invention relates to means for improving propulsion effeciency and more particularly to improve propeller nozzles.
  • Propulsion devices for ships with propellers utilizing nozzles which enclose the propellers are known. It is further known to shape and arrange the propeller nozzle in such relationship to the propeller that the propeller will come to operate at the place where the propeller nozzle has its smallest flow cross section, and has a quite small clearance with the propeller blade circle. Furthermore, the propeller nozzle is so shaped that the flow section behind the propeller changes very slightly or not at all, while the fiow section in front of the propeller increases in the forward direction. It is also known to shape the propeller nozzle inlet edge rounded with a large radius.
  • propeller nozzles have been rotationally symmetrical, and have been designed according to mean values for the hull stream.
  • the hull stream in the propeller zone is, however, especially for ships with greater block ratio or block coefficient, as is the case with most larger tank/bulk ships, not rotationally symmetrical.
  • the invention has its basis in the recognition of this, and according to the invention a propeller nozzle is suggested in which the geometry of the nozzle profile varies. With such a propeller nozzle, one can change the hull stream in the propeller zone to a field of a more rotationally symmetrical nature, such that each propeller blade sees a more even hull stream picture during the rotation of the propeller.
  • the propeller nozzle is built from nozzle sectors with unequal profiles, such that the propeller nozzle has profiles varying discontinuously.
  • the transitions from one profile type to another are so made that turbulence preferably is not created.
  • a design of this type offers productional advantages.
  • the geometry of the propeller nozzle does, furthermore, depend on the profiles one wishes to employ. It is, in this way, possible to make a significant part of the propeller nozzle rotationally symmetrical while the variations in the profile are to be found in the forward edge of the propeller nozzle.
  • the propeller nozzle may be so designed that the inside of the propeller nozzle behind the propeller zone is made to be common for all the profiles.
  • the profiles may vary both in size, shape and type.
  • the propeller nozzle may, according to the invention, be provided with so-called high-lift slits in front of the propeller zone.
  • High-lift slits are here inclusive of any opening through the profile.
  • a significant advantage of using a high-lift profile is that it facilitates an increase in the thickness of the boundary layer on the inside of the propeller nozzle in the path of the propeller blade tip. This reduces the demands of small clearances for the propeller blade tips.
  • FIG. 1 in a front view of a propeller nozzle according to the invention.
  • FIG. 2 is a side view of the propeller nozzle shown in FIG. 1.
  • FIG. 3 is a fragmentary front view of another propeller nozzle according to the invention.
  • FIG. 4 is a view illustrating a part of the propeller nozzle in FIG. 3 folded out flat.
  • FIG. 5 in a view in partial section through a propeller nozzle according to the invention, with a high-lift profile.
  • FIGS. 1 and 2 are shown a propeller nozzle in which the body thereof is provided with an upper nozzle sector 1, within which the profile is uniform over the whole sector, a lower nozzle sector 2, which, also has an uniform profile on the whole sector and a side sector 3, with a mirror image sector 4. Also in the two side sectors, the profile is uniform within the sectors.
  • the profiles in the nozzle sectors 1 4 are, however, individually different, with exception of the two side sectors 3, 4, as is evident from FIG. 2.
  • FIGS. 3 and 4 Another propeller nozzle according to the invention is shown in FIGS. 3 and 4.
  • the nozzle has several nozzle sectors 7, 8, 9 and 10 which have mutually different profiles, respectively, as is evident from a closer study of FIG. 4, in which the propeller nozzle in FIG. 3 is shown unfolded.
  • FIG. 4 shows clearly that the nozzle sector 7 has a certain profile 11, while the nozzle sector 9 has a second profile 12 and the nozzle sector 10 has a third profile 13.
  • the dotted lines 14 and 15 indicate transitions between sectors, in order to avoid turbulence.
  • the propeller zone is indicated by the dotted line 16. Behind the propeller zone, the inside 19 of the propeller nozzle is common for all of the profiles.
  • FIG. 5 shows a partial section through a profile, which may be a profile in one of the propeller nozzles shown in FIGS. 1 4.
  • Profile 21 is equipped with high lift slits 18. The leading part of the profile is connected by means of webs 19 to the main part of the profile.
  • the high-lift slits 18 are, as is evident from FIG. 5, arranged in front of the propeller zone.
  • a propeller blade is indicated by 20.
  • FIGS. 1 and 2 two dotted lines are drawn near theprofile 4. These dotted lines indicate two other possible variations in the profile. Generally, the profiles may be varied according to the specific situation, in order to obtain the most favorable solution.
  • a nozzle for a propeller for improving propulsion 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Toys (AREA)
  • Nozzles (AREA)
  • Glass Compositions (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
US00149740A 1970-06-11 1971-06-03 Propeller nozzle Expired - Lifetime US3738307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO02274/70A NO127962B (enrdf_load_stackoverflow) 1970-06-11 1970-06-11

Publications (1)

Publication Number Publication Date
US3738307A true US3738307A (en) 1973-06-12

Family

ID=19878743

Family Applications (1)

Application Number Title Priority Date Filing Date
US00149740A Expired - Lifetime US3738307A (en) 1970-06-11 1971-06-03 Propeller nozzle

Country Status (9)

Country Link
US (1) US3738307A (enrdf_load_stackoverflow)
DE (1) DE2129068A1 (enrdf_load_stackoverflow)
ES (1) ES198440Y (enrdf_load_stackoverflow)
FI (1) FI52052C (enrdf_load_stackoverflow)
FR (1) FR2096098A5 (enrdf_load_stackoverflow)
GB (1) GB1310803A (enrdf_load_stackoverflow)
NL (1) NL7108071A (enrdf_load_stackoverflow)
NO (1) NO127962B (enrdf_load_stackoverflow)
SE (1) SE378576B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776755A (en) * 1986-03-27 1988-10-11 Wartsila Meriteollisuus Oy Shrouded propeller
US5292088A (en) * 1989-10-10 1994-03-08 Lemont Harold E Propulsive thrust ring system
US5393197A (en) * 1993-11-09 1995-02-28 Lemont Aircraft Corporation Propulsive thrust ring system
US5474419A (en) * 1992-12-30 1995-12-12 Reluzco; George Flowpath assembly for a turbine diaphragm and methods of manufacture
US5586864A (en) * 1994-07-27 1996-12-24 General Electric Company Turbine nozzle diaphragm and method of assembly
US20020168266A1 (en) * 1999-05-21 2002-11-14 David Reinfeld Vortex attractor without a backplate
EP2060482A1 (de) * 2007-11-16 2009-05-20 becker marine systems GmbH & Co. KG Kortdüse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2317799B1 (es) * 2008-08-01 2010-03-17 Juan Jose Romero Vazquez Sistema de propulsion con helice y tobera fija respecto a la helice.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3455268A (en) * 1966-10-13 1969-07-15 Samuel J Gordon Nonsymmetric shroud-propeller combination for directional control

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3455268A (en) * 1966-10-13 1969-07-15 Samuel J Gordon Nonsymmetric shroud-propeller combination for directional control

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776755A (en) * 1986-03-27 1988-10-11 Wartsila Meriteollisuus Oy Shrouded propeller
US5651707A (en) * 1989-10-10 1997-07-29 Lemont; Harold E. Propulsive thrust ring system
US5470202A (en) * 1989-10-10 1995-11-28 Lemont; Harold E. Propulsive thrust ring system
US5292088A (en) * 1989-10-10 1994-03-08 Lemont Harold E Propulsive thrust ring system
US5474419A (en) * 1992-12-30 1995-12-12 Reluzco; George Flowpath assembly for a turbine diaphragm and methods of manufacture
US5393197A (en) * 1993-11-09 1995-02-28 Lemont Aircraft Corporation Propulsive thrust ring system
US5586864A (en) * 1994-07-27 1996-12-24 General Electric Company Turbine nozzle diaphragm and method of assembly
US20020168266A1 (en) * 1999-05-21 2002-11-14 David Reinfeld Vortex attractor without a backplate
US6960063B2 (en) * 1999-05-21 2005-11-01 Vortexhc, Llc Vortex attractor without a backplate
EP2060482A1 (de) * 2007-11-16 2009-05-20 becker marine systems GmbH & Co. KG Kortdüse
US20090130927A1 (en) * 2007-11-16 2009-05-21 Mathias Kluge Kort nozzle
US20100323566A1 (en) * 2007-11-16 2010-12-23 Becker Marine Systems Gmbh & Co. Kg Kort nozzle
US8246401B2 (en) 2007-11-16 2012-08-21 Becker Marine Systems Gmbh & Co., Kg Kort nozzle

Also Published As

Publication number Publication date
FI52052C (fi) 1977-06-10
ES198440Y (es) 1975-10-16
FI52052B (enrdf_load_stackoverflow) 1977-02-28
GB1310803A (en) 1973-03-21
ES198440U (es) 1975-06-16
DE2129068A1 (de) 1972-01-13
NL7108071A (enrdf_load_stackoverflow) 1971-12-14
FR2096098A5 (enrdf_load_stackoverflow) 1972-02-11
NO127962B (enrdf_load_stackoverflow) 1973-09-10
SE378576B (enrdf_load_stackoverflow) 1975-09-08

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