EP0100058A1 - Method and apparatus for increasing efficiency of a propeller-driven vehicle - Google Patents

Method and apparatus for increasing efficiency of a propeller-driven vehicle Download PDF

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Publication number
EP0100058A1
EP0100058A1 EP83107069A EP83107069A EP0100058A1 EP 0100058 A1 EP0100058 A1 EP 0100058A1 EP 83107069 A EP83107069 A EP 83107069A EP 83107069 A EP83107069 A EP 83107069A EP 0100058 A1 EP0100058 A1 EP 0100058A1
Authority
EP
European Patent Office
Prior art keywords
hull
propeller
nozzle
fluid
duct
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.)
Withdrawn
Application number
EP83107069A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ramon Ruiz-Fornells
Gonzalo Pérez Gomez
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.)
Astilleros Espanoles SA
Original Assignee
Astilleros Espanoles SA
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 Astilleros Espanoles SA filed Critical Astilleros Espanoles SA
Publication of EP0100058A1 publication Critical patent/EP0100058A1/en
Withdrawn legal-status Critical Current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
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/02—Propulsive elements directly acting on water of rotary type
    • B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
    • B63H1/14—Propellers
    • B63H1/28—Other means for improving propeller efficiency

Definitions

  • This invention relates to the art of propeller-driven vehicles, particularly the art of propeller-driven ships wherein the propeller cooperates with a nozzle.
  • U.S. Patent 3,677,660 shows a propeller in combination with a Kort nozzle wherein the nozzle is modified to prevent problems associated with solid objects in the flowing liquid.
  • Patent 4,288,223 (Gonzalez et al.) is directed to a combination of a ship propeller in juxtaposition with a non-rotating tubular duct, the propeller having an axis, a diameter and a plurality of blades, each blade having (a) a tip radius, (b) a fixed plate and (c) a back or suction side; the tubular duct (d) being coaxial with and displaced from said propeller and on the back or suction side thereof, (e) effectively comprising means to extend a geometric figure generated (by a cross-section of an axial plane, through the tip radius of a blade, with the fixed plate) on rotation of said fixed plate about the axis, (f) having an internal radius at a point adjacent to the fixed plate which is approximately that of the geometricl figure at a point which is closest to said duct, (g) providing means to direct fluid toward said back or suction side of said propeller and (h) having a length at its shortest point which is at least 20 percent and
  • the apparatus is a combination of (1) a ship propeller having a plurality of blades, each with a tip section having a separate fixed barrier or closing plate of a predetermined orientation extending transversely therefrom and designed to have finite circulation (or loading) values at the tip sections, and (2) tubular-duct means to direct liquid (passing therethrough and contacting the tip sections) to make such contact substantially parallel to the orientation of the barrier or closing plates, the tubular-duct means being coaxial with, adjacent to and displaced from or around the ship propeller.
  • the invention is an improvement in vehicles, preferably ships, using a propeller in combination with a nozzle and results in improved interaction between the nozzle and fluid flow in the stern region of a ship.
  • a severe problem with the use of nozzles is a phenomenon whereby flow of liquid around the stern portion of a vessel's hull may interfere with liquid flow into the nozzle and thus reduce propeller efficiency. Adverse results of such interference can be diminished by reducing the magnitude of circulation which is developed by the nozzle. However, this reduction of circulation decreases thrust supplied by the nozzle and, in turn, significantly decreases the ability of the nozzle to aid in propulsion.
  • the invention concerns a stern tunnel (formed by at least one fin, on the hull of a vessel) which makes the liquid flow absorbed by the nozzle independent of the flow developed in the afterzone of the vessel.
  • the tunnel may be an integral part of the hull or added to an existing hull, as by welding.
  • the fins of the invention substantially reduce or eliminate sheet cavitation by separating an upper part of the flow from a lower part and by substantially increasing the velocity of the flow of fluid into the nozzle.
  • the velocity of flow is particularly increased at the upper part of the nozzle which is the area most important for reducing sheet cavitation.
  • the preferred embodiment of the invention is a combination of (a) the previously-described propeller-duct arrangement of U.S. Patent 4,288,223 or U.S. Application No. 259,680, wherein the duct directs fluid to transverse barrier plates in a shock-free manner, with (b) two fins which form a stern tunnel above the propeller and duct.
  • the invention is useful, however, with other propeller-nozzle arrangements.
  • the fins of the invention may be used with any other propeller-nozzle combination to produce markedly improved performance.
  • the preferred embodiment should not be interpreted in any way to limit the scope of the invention.
  • the description of the improved flow achieved with the invention applies to all types of propeller-nozzle combinations.
  • Large circulation usually causes flow separation in the afterbody and adverse pressure distribution.
  • a still further object of this invention to provide two fins to form a tunnel to improve the flow of fluid in the stern region of a vessel employing a propeller and a nozzle.
  • Figure 1 is a schematic view of a stern portion of a vessel.
  • a hull 2 supports a propeller 4 for rotation about an axis 6.
  • Each blade of the propeller carries transverse end plate 5 for producing finite circulation.
  • a nozzle or duct 8 is mounted to the stern 2 adjacent to or overlapped with the propeller 4. The purpose of the duct is to direct fluid flow into the popeller to increase the efficiency of the propeller and to provide shock-free flow to the end plates.
  • a mounting bracket 10 supports a rudder 12 which is used for controlling the direction of the vessel.
  • one problem associated with a propeller-duct construction is that the flow around the stern 2 interacts and interferes with flow through nozzle 8. As liquid flows around the hull, a first flow pattern develops, and this flow is incident on the nozzle. But the nozzle develops a second flow pattern which is not compatible with the first flow pattern.
  • Figure 1 shows a fin 14 which is attached to the stern portion of hull 2. This fin extends longitudinally along the stern, and its preferred length in the fore-aft direction is between 1/25th and 1/4th of the length of the vessel.
  • the fin 14 is attached to the vessel at a surface which extends between edges 16 and 18 of the fin.
  • An outer surface of the fin curves from the edge 16 to an outermost edge 20, and an inner surface curves from the outermost edge 20 back to the hull of the ship at edge 18.
  • the fin extends from a point forward of the nozzle to a point just rearward of the nozzle. This is a preferred arrangement of the fin, but it will be appreciated by those of ordinary skill in the art that the beginning and ending positions of the fin may be varied somewhat.
  • the length of the nozzle 8, measured in a direction generally parallel to the length of a fin, is preferably smaller than the propeller diameter and larger than 0,1 times the propeller diameter.
  • Figure 2 shows a rear view of the left half of the stern.
  • a central vertical plane is indicated at line 22, and the lines 24 schematically show the contour of a typical hull in the stern region.
  • the fin 14, includes another surface 25 extending between edges 16 and 20 and an inner surface 28 extending between edges 18 and 20.
  • the nozzle 8 has an outer surface 9 spaced from inner surface 28,
  • the preferred distance between the center plane 22 and the edge 20, in a vertical plane transverse to the central plane 22 and at the most forward point of the nozzle, is between the nozzle diameter and 1/4th the nozzle diameter.
  • the radial distance between the outer surface 9 of the nozzle and the inner surface 28 of the duct is preferably between 0.05 times the nozzle diameter and 0.5 times the nozzle diameter.
  • the fins may be at an angle to the nozzle so that the vertical distance between the outer surface of the nozzle and the inner surface of a fin varies in a longitudinal direction.
  • FIGS. 1 and 2 show only a single fin, in a preferred embodiment there are two fins which are symmetrical about the central plane 22 shown in figure 2.
  • Figure 3 shows preferred propeller-duct configurations.
  • the duct 8 provides a fluid stream which contacts plates 5 under shock-free conditions.
  • the fins 14 are used in combination with the propeller-duct configurations of Figure 3, markedly improved performance is obtained.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Types And Forms Of Lifts (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
  • Control Of Transmission Device (AREA)
  • Structure Of Transmissions (AREA)
EP83107069A 1982-07-19 1983-07-19 Method and apparatus for increasing efficiency of a propeller-driven vehicle Withdrawn EP0100058A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES514112 1982-07-19
ES514112 1982-07-19

Publications (1)

Publication Number Publication Date
EP0100058A1 true EP0100058A1 (en) 1984-02-08

Family

ID=8484480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107069A Withdrawn EP0100058A1 (en) 1982-07-19 1983-07-19 Method and apparatus for increasing efficiency of a propeller-driven vehicle

Country Status (11)

Country Link
EP (1) EP0100058A1 (pt)
JP (1) JPS5996093A (pt)
KR (1) KR840005402A (pt)
BR (1) BR8303846A (pt)
DD (1) DD210095A5 (pt)
DK (1) DK332083A (pt)
FI (1) FI832576A (pt)
GR (1) GR82298B (pt)
NO (1) NO832600L (pt)
PL (1) PL243092A1 (pt)
PT (1) PT77032B (pt)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1034333C2 (nl) * 2007-09-04 2009-03-11 Hrp Holding B V Voortstuwingsinstallatie voor een vaartuig met schroef en straalbuis.
ES2317799A1 (es) * 2008-08-01 2009-04-16 Juan Jose Romero Vazquez Sistema de propulsion con helice y tobera fija respecto a la helice.
WO2010023522A2 (fr) * 2008-08-27 2010-03-04 Drs Drag Reduction Systems Sa Dispositif de canalisation du flux d'eau autour du moyeu d'une helice de bateau

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1106558A (fr) * 1954-08-19 1955-12-20 Ostermann & Co écran d'hélice
FR1170011A (fr) * 1957-03-25 1959-01-08 Aileron pour la stabilisation et la direction des filets d'eau pour bateaux
GB941444A (en) * 1960-08-05 1963-11-13 Ts B Konstrukcji Okretowych Ship propeller hoods
FR1425538A (fr) * 1964-12-07 1966-01-24 Propulseur à réaction sous-marine
US3635186A (en) * 1970-02-25 1972-01-18 William H German Ship construction
FR2320863A1 (fr) * 1975-08-14 1977-03-11 Mitsui Shipbuilding Eng Dispositif d'amelioration de la propulsion des navires

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1106558A (fr) * 1954-08-19 1955-12-20 Ostermann & Co écran d'hélice
FR1170011A (fr) * 1957-03-25 1959-01-08 Aileron pour la stabilisation et la direction des filets d'eau pour bateaux
GB941444A (en) * 1960-08-05 1963-11-13 Ts B Konstrukcji Okretowych Ship propeller hoods
FR1425538A (fr) * 1964-12-07 1966-01-24 Propulseur à réaction sous-marine
US3635186A (en) * 1970-02-25 1972-01-18 William H German Ship construction
FR2320863A1 (fr) * 1975-08-14 1977-03-11 Mitsui Shipbuilding Eng Dispositif d'amelioration de la propulsion des navires

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1034333C2 (nl) * 2007-09-04 2009-03-11 Hrp Holding B V Voortstuwingsinstallatie voor een vaartuig met schroef en straalbuis.
ES2317799A1 (es) * 2008-08-01 2009-04-16 Juan Jose Romero Vazquez Sistema de propulsion con helice y tobera fija respecto a la helice.
WO2010023522A2 (fr) * 2008-08-27 2010-03-04 Drs Drag Reduction Systems Sa Dispositif de canalisation du flux d'eau autour du moyeu d'une helice de bateau
WO2010023522A3 (fr) * 2008-08-27 2010-11-18 Drs Drag Reduction Systems Sa Dispositif de canalisation du flux d'eau autour du moyeu d'une helice de bateau

Also Published As

Publication number Publication date
FI832576A (fi) 1984-01-20
BR8303846A (pt) 1984-08-28
PT77032B (en) 1986-02-03
PL243092A1 (en) 1984-03-12
JPS5996093A (ja) 1984-06-02
DD210095A5 (de) 1984-05-30
KR840005402A (ko) 1984-11-12
DK332083D0 (da) 1983-07-19
GR82298B (pt) 1984-12-13
PT77032A (en) 1983-08-01
NO832600L (no) 1984-01-20
DK332083A (da) 1984-01-20
FI832576A0 (fi) 1983-07-14

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): DE FR GB IT NL SE

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Effective date: 19840808

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18D Application deemed to be withdrawn

Effective date: 19851014

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Inventor name: RUIZ-FORNELLS, RAMON

Inventor name: PEREZ GOMEZ, GONZALO