EP0411056A1 - Double nozzle. - Google Patents

Double nozzle.

Info

Publication number
EP0411056A1
EP0411056A1 EP89906822A EP89906822A EP0411056A1 EP 0411056 A1 EP0411056 A1 EP 0411056A1 EP 89906822 A EP89906822 A EP 89906822A EP 89906822 A EP89906822 A EP 89906822A EP 0411056 A1 EP0411056 A1 EP 0411056A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
main
double
flap
main nozzle
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.)
Granted
Application number
EP89906822A
Other languages
German (de)
French (fr)
Other versions
EP0411056B1 (en
Inventor
Gunsteren Leonard Anthonie Van
Jacon Lourens Gelling
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.)
Scheepswerf Van De Giessen Bv (vdg)
Original Assignee
Van Gunsteren & Gelling Marine Propulsion Development Bv
Gunsteren & Gelling Marine Pro
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 Van Gunsteren & Gelling Marine Propulsion Development Bv, Gunsteren & Gelling Marine Pro filed Critical Van Gunsteren & Gelling Marine Propulsion Development Bv
Publication of EP0411056A1 publication Critical patent/EP0411056A1/en
Application granted granted Critical
Publication of EP0411056B1 publication Critical patent/EP0411056B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • Double nozzle Double nozzle
  • This invention relates to the propulsion of waterborne vessels employing propellers surrounded by one or more shrouds.
  • Shrouded propellers sometimes referred to as nozzle propellers or propellers in so-called Kort nozzles are known since several decades. Two types can be distinguished. One type in which the shroud is connected to the blade tips and therefore rotates with the propeller - this type is known as ring propeller - and the other type in which the shroud is stationary and fixed to the hull of the ship.
  • the Hannon slot does not yield any increase of the effective diffusor angle whereby the efficiency improvement of the present invention is achieved;
  • the openings of the Hannon slot cover the circumference of the nozzle only in part - mentioned is 25% - whereas the present invention envisages an opening over the complete circumference.
  • This double nozzle consists of a main nozzle, in which the propeller rotates, and a second nozzle rearward of the main nozzle viewed in the ahead direction, and acting as a flap to the main nozzle, whereby the opening between the main nozzle and the flap extends inwardly and rearwardly, which in effect causes the improvement of the propulsive efficiency.
  • the inner surfaces of the two nozzle parts are lying on a common smooth curve.
  • Both parts of the double nozzle i.e. the main nozzle and the flap nozzle, are preferably connected to each other, although they may be independently connected to the hull of the ship by known means. The connection may consist, for instance, by entended radial stiffening plates of the main nozzle reaching into the construction of the flap nozzle.
  • Figure 1 shows a longitudinal section of a double nozzle according to the invention
  • Figure 2 shows a similar section in more detail.
  • Figure 1 shows the double nozzle, consisting of a main nozzle 1 and a flap nozzle 2, which are connected to a hull 3 of a ship by appropriate means (not shown). Inside the main nozzle operates a propeller, having blades 4 mounted on a hub 5, driven by a shaft (not shown) in a known manner. Seen in the axial direction, the main nozzle has a circular shape. The thickness of the profile of main nozzle 1 is reduced towards its rear end and its thinner part overlaps in part the front part of flap nozzle 2, the opening 6 between the two nozzle profiles extending rearwardly and inwardly.
  • FIG. 2 Further detail of the latter is shown in Figure 2, wherein main nozzle 1 and flap nozzle 2 are shown (without applied connecting parts) and the opening 6 between the two nozzle profiles. Said opening is formed by the thin part la of main nozzle 1 and front part 2a of flap nozzle 2.
  • the double nozzle according to the invention can be applied in various combinations with the propeller.
  • the most usual one is to locate the propeller inside main nozzle 1, but in special cases the propeller may be located aft of main nozzle 1.
  • the propeller can be fixed pitch or of controllable pitch type.
  • the double nozzle may be attached to the blade tips so that both rings will rotate with the propeller.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Nozzles (AREA)
  • Toys (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

L'invention concerne un ajutage double composé d'un ajutage principal (1) et d'un ajutage à clapet (2) placé coaxialement et fonctionnant conjointement avec l'ajutage principal (1), comprenant une ouverture (6) formée entre les deux profilés d'ajutage par la partie mince (1a) de l'ajutage principal (1) et la partie frontale (2a) de l'ajutage à clapet (2), ladite ouverture (6) s'étendant vers l'arrière et vers l'intérieur. L'ajutage principal (1) et l'ajutage à clapet (2) peuvent être reliés par des parties prolongées de la construction de l'ajutage, telles que des plaques de raidissement radiales.The invention relates to a double nozzle consisting of a main nozzle (1) and a valve nozzle (2) placed coaxially and functioning in conjunction with the main nozzle (1), comprising an opening (6) formed between the two. nozzle profiles by the thin part (1a) of the main nozzle (1) and the front part (2a) of the valve nozzle (2), said opening (6) extending rearwardly and towards inside. The main nozzle (1) and the valve nozzle (2) can be connected by extended parts of the nozzle construction, such as radial stiffening plates.

Description

Double nozzle.
This invention relates to the propulsion of waterborne vessels employing propellers surrounded by one or more shrouds. Shrouded propellers, sometimes referred to as nozzle propellers or propellers in so-called Kort nozzles are known since several decades. Two types can be distinguished. One type in which the shroud is connected to the blade tips and therefore rotates with the propeller - this type is known as ring propeller - and the other type in which the shroud is stationary and fixed to the hull of the ship.
In British Patent Specification No.1,324, 356 is described that the propulsion of ships can be improved by fitting a first ring surrounding the propeller along with a second ring coaxial with the first one, such that a slot is formed between the two rings, the two rings together forming a single foil shape with, in any axial section, the inner surfaces of the two rings lying approximately on a common smooth curve, and the slot extending inwardly and rearwardly and being shaped in such a way that, in use, the lift produced by the foil is larger than without the slot. It is also mentioned that both rings may be made stationary, the propeller rotating in one of the rings.
British Patent Specification NO.1,215,136 descrices a concept known in the art as the so called "Kannon slot". Its purpose is to improve the astern performance of a nozzle. Thus the Hannon slot does improve the astern performance but does not improve the efficiency in the ahead condition as is achieved by the present invention. Fundamental differences of the Hannon slot in comparison with the present invention are (a) that the direction of the slot with respect to the flow is approximately perpendicular to that of the present invention, resulting in een improvement of the astern performance by the Hannon slot but without improvement of the efficiency in the ahead condition. (b) the Hannon slot does not yield any increase of the effective diffusor angle whereby the efficiency improvement of the present invention is achieved; (c) the openings of the Hannon slot cover the circumference of the nozzle only in part - mentioned is 25% - whereas the present invention envisages an opening over the complete circumference. Thus it has been found according to the present invention that the disadvantages of the above state of the art can be overcome, and an improvement of the propulsive efficiency can be achieved, by fitting a double nozzle around the propeller. This double nozzle consists of a main nozzle, in which the propeller rotates, and a second nozzle rearward of the main nozzle viewed in the ahead direction, and acting as a flap to the main nozzle, whereby the opening between the main nozzle and the flap extends inwardly and rearwardly, which in effect causes the improvement of the propulsive efficiency. In contrast the state of the art, especially as discussed above, it is not neceesary for the double nozzle according to the present invention that the inner surfaces of the two nozzle parts are lying on a common smooth curve. Both parts of the double nozzle, i.e. the main nozzle and the flap nozzle, are preferably connected to each other, although they may be independently connected to the hull of the ship by known means. The connection may consist, for instance, by entended radial stiffening plates of the main nozzle reaching into the construction of the flap nozzle.
It has appeared from tests that providing a jump in the inner surfaces of both nozzle parts by selecting a larger inside diameter for the flap nozzle yields an improvement of the propulsive efficiency. This is analogous to the known improvement of efficiency due to an increase of the diffusor angle, which however is limited to about 7 degrees or flow separation will occur. This limitation is removed in the present invention by the interaction of the two nozzle profiles .
The invention will now be illustrated by way of example with reference to the accompanying drawings, wherein:
Figure 1 shows a longitudinal section of a double nozzle according to the invention; and Figure 2 shows a similar section in more detail.
Figure 1 shows the double nozzle, consisting of a main nozzle 1 and a flap nozzle 2, which are connected to a hull 3 of a ship by appropriate means (not shown). Inside the main nozzle operates a propeller, having blades 4 mounted on a hub 5, driven by a shaft (not shown) in a known manner. Seen in the axial direction, the main nozzle has a circular shape. The thickness of the profile of main nozzle 1 is reduced towards its rear end and its thinner part overlaps in part the front part of flap nozzle 2, the opening 6 between the two nozzle profiles extending rearwardly and inwardly.
Further detail of the latter is shown in Figure 2, wherein main nozzle 1 and flap nozzle 2 are shown (without applied connecting parts) and the opening 6 between the two nozzle profiles. Said opening is formed by the thin part la of main nozzle 1 and front part 2a of flap nozzle 2.
The double nozzle according to the invention can be applied in various combinations with the propeller. The most usual one is to locate the propeller inside main nozzle 1, but in special cases the propeller may be located aft of main nozzle 1.
It will be obvious that the propeller can be fixed pitch or of controllable pitch type. In the case of a propeller with fixed pitch, the double nozzle may be attached to the blade tips so that both rings will rotate with the propeller.

Claims

Claims :
1. A double nozzle, consisting of a main nozzle (1) and a flap nozzle (2), coaxially located and operating in conjunction with the main nozzle (1), an opening (6) being formed between the two nozzle profiles by the thin part (1a) of main nozzle (1) and the front part (2a) of flap nozzle (2), opening (6) extending rearwardly and inwardly.
2. A double nozzle according to claim 1, characterised in that main nozzle (1) and flap nozzle (2) are connected by extended parts of the nozzle construction.
3. A double nozzle according to claim 1 or 2, characterised in that the connection consists of radial stiffening plates.
4. A double nozzle according to one or more of the foregoing claims, characterised in that the inside of flap nozzle (2) shows an outward jump (larger diameter) with respect to the inside of main nozzle (1)
5. A double nozzle according to one or more of the foregoing claims, characterised in that it is connected to the fixed pitch propeller blade tips.
EP89906822A 1988-06-01 1989-06-01 Double nozzle Expired - Lifetime EP0411056B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8801402 1988-06-01
NL8801402A NL8801402A (en) 1988-06-01 1988-06-01 DOUBLE SPRAY TUBE.

Publications (2)

Publication Number Publication Date
EP0411056A1 true EP0411056A1 (en) 1991-02-06
EP0411056B1 EP0411056B1 (en) 1993-12-29

Family

ID=19852387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89906822A Expired - Lifetime EP0411056B1 (en) 1988-06-01 1989-06-01 Double nozzle

Country Status (6)

Country Link
EP (1) EP0411056B1 (en)
KR (1) KR900701602A (en)
AU (1) AU3758989A (en)
DE (1) DE68911913T2 (en)
NL (1) NL8801402A (en)
WO (1) WO1989011998A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013178853A2 (en) 2012-05-30 2013-12-05 Romero Vazquez Juan Jose Symmetrical fixed accelerating nozzle for aquatic vessels in the free navigation state
US11352112B2 (en) 2017-12-20 2022-06-07 Juan José ROMERO VÁZQUEZ Accelerating ducted propeller system for propelling boats

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE447117A (en) *
DE941048C (en) * 1941-12-28 1956-03-29 Josef Neukamm Guide nozzle for ships with screw drive
DE883255C (en) * 1950-02-07 1953-07-16 Erich Grundt Sheathing for screw propeller
FR1381494A (en) * 1963-10-29 1964-12-14 Improvements to ship thrusters
NL7013069A (en) * 1969-09-05 1971-03-09
US4637801A (en) * 1984-07-12 1987-01-20 William H. Flood Thrust enhancing propeller duct assembly for water craft

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8911998A1 *

Also Published As

Publication number Publication date
DE68911913D1 (en) 1994-02-10
WO1989011998A1 (en) 1989-12-14
NL8801402A (en) 1990-01-02
DE68911913T2 (en) 1994-05-26
KR900701602A (en) 1990-12-03
EP0411056B1 (en) 1993-12-29
AU3758989A (en) 1990-01-05

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