EP0255136A1 - Schiffsschraubennabe mit Flossen - Google Patents

Schiffsschraubennabe mit Flossen Download PDF

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Publication number
EP0255136A1
EP0255136A1 EP87111052A EP87111052A EP0255136A1 EP 0255136 A1 EP0255136 A1 EP 0255136A1 EP 87111052 A EP87111052 A EP 87111052A EP 87111052 A EP87111052 A EP 87111052A EP 0255136 A1 EP0255136 A1 EP 0255136A1
Authority
EP
European Patent Office
Prior art keywords
propeller
fins
boss
cap
boss cap
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Withdrawn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
EP87111052A
Other languages
English (en)
French (fr)
Inventor
Michihito c/o West Japan Fluid Ogura
Hajime c/o West Japan Fluid Koizuka
Toshinori Takeshita
Yoshio Kohno
Kazuyuki Ouchi
Takashi Shiotsu
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.)
West Japan Fluid Engineering Laboratory Co Ltd
Mitsui OSK Lines Ltd
Mikado Propeller Co Ltd
Original Assignee
West Japan Fluid Engineering Laboratory Co Ltd
Mitsui OSK Lines Ltd
Mikado Propeller Co Ltd
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 West Japan Fluid Engineering Laboratory Co Ltd, Mitsui OSK Lines Ltd, Mikado Propeller Co Ltd filed Critical West Japan Fluid Engineering Laboratory Co Ltd
Publication of EP0255136A1 publication Critical patent/EP0255136A1/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • B63H2001/283—Propeller hub caps with fins having a pitch different from pitch of propeller blades, or a helix hand opposed to the propellers' helix hand

Definitions

  • the present invention relates to a boss cap of a screw propeller, particularly to a screw propeller boss cap with fins.
  • An object of the present invention therefore is to provide a new technique which enables to improve the propeller characteristics particularly the propeller efficiency to a considerably high extent through addition of a boss cap with fins to a propeller.
  • an ordinary screw propeller 31 comprises a plurality of blades 33 provided in a equidistance around the periphery of a boss 32 and is connected through the boss 32 to a rotational drive shaft 34.
  • a conical boss cap 35 is mounted on an end opposite to the drive shaft 34 of the boss 32 in order to reduce vortices generated downstream of the boss 32 as much as possible.
  • the present invention presents a cap to be mounted on a boss of a screw propeller; which cap has fins satisfying the following conditions:
  • the fins provided according to the present invention are not those for generating a thrust by themselves, but for guiding the water stream rearward of the boss cap to a direction to reduce the generation of the hub vortex.
  • the present invention gives a particularly higher effect to a propeller having a higher pitch ratio (H/D) which generates a stronger hub vortex.
  • the fins may be provided to have a rake angle or a positive or negative camber against the boss cap.
  • Tests are made in a water tank, using models of propellers having the data as shown in the following table 1.
  • the water tank is of a circular stream type and has an observational part of scales 5.0 m (length) X 2.0 m (width) X 1.0 m (depth).
  • the maximum flow rate is 2.0 m/sec and the uniformity of the flow rate is within 1.5%.
  • a side view of a propeller characteristics measurement apparatus is shown partly by a section.
  • This apparatus is located in the observational part of said water tank by securing its propeller open boat 41 to a rigid carrier (not shown) placed above the water tank.
  • the boat 41 has a drive mechanism 43 to rotate a propeller 42 which may detachably be attached to its tip end, a thrust detector 44 and a torque detector 45.
  • a propeller rotating speed is measured by a digital counter TM-225 (product of Ono Measurement Instruments company, Japan) and a flow rate by a combination of a JIS type Pitot tube and a differential pressure converter DLPU-0.02 (product of Toyo Boldwin company, Japan).
  • the analogue signals of such thrust, torque and flow rate represented by the differential pressure, etc. are converted to digital signals through an A/D converter provided in a microprocessor located in a separate controller and processed into physical data which then are printed by a pinter or plotted by a plotter.
  • a thrust coefficient (KT) and a torque coefficient (KQ) are measured under different advance coefficients (J) adjusted by changing the flow rate while keeping the propeller rotating speed approprimately constant within the range of 7.5-9.0 r.p.s..
  • J advance coefficients
  • a cap of a rounded conical shape having a base diameter of 35 mm and a height of 25.6 mm is prepared.
  • the cap may be mounted on the propeller by any known means and in these experiments a bolt-nut securing is employed.
  • fins to be provided on the boss cap those having six different triangular shapes (A)-(F) shown by a plan view in Fig. 5 are prepared from flat plates of 1 mm thickness to have the dimensions as shown in the following table 2.
  • Fig. 6 shows the relative positions of the fins and the boss cap.
  • a rear end O of a root 62 of a propeller blade 61 is set on the propeller axis 63 as a reference point.
  • a peripheral distance from the front end of a fin 64 to the plane including the reference point O and the propeller axis 63 is called “a” (positive in the direction of propeller rotation shown by an arrow).
  • a surface distance from the front end of the fin 64 to a periphery including the reference point O is called “b”.
  • the angle of the fin 64 against plane normal to the propeller axis is called “Alpha” ( ⁇ ).
  • the geometric pitch angle of the propeller blade root 62 is called “Epsilon"( ⁇ ).
  • the geometric pitch angle ⁇ of a propeller blade root is one based upon a nose-tail line of the propeller blade root. More precisely, two surfaces of a cylindrical surface having an axis on the propeller axis and a radius equal to the boss radius and a propeller blade surface or its extension as a suspected surface are considered. A cylindrical surface intercepted by a crossing line between these two surfaces, that is, a cylindrical section, is developed on a plane. In the developed view, an angle between a nose-tail line of the blade section defined by the developed cylindrical section and a line normal to a generatrix of the cylindrical surface corresponds to the ⁇ .
  • the fin 64 is mounted on the boss cap in the direction perpendicular to the sheet of the Fig. 6, when no rake angle is given.
  • the mounting is made, in these experiments, by cutting a groove on the boss cap, inserting the lower portion of the fin into the groove and fixing by means of an adhesive, but it is of course possible and in actual cases it is preferred to form the boss cap and the fins integrally as one body.
  • the broken lines shown in the lower portions of fins in the Fig. 5 indicate crossing lines between the fin surface and the boss cap surface after mounting of the former on the latter.
  • Fig. 1 shows a front view of thus composed propeller 1, boss 2, propeller blades 3, shaft 4, boss cap 5 and fins 6; and Fig. 2 shows a side view thereof.
  • an increase ratio (d ⁇ ) of the propeller efficiency increased from the cases without fins to the cases with fins has been calculated by percents.
  • the results are shown in the following tables 3 and 4.
  • Fig. 7 illustrates the results of the tables 3 and 4 showing the advance coefficient (J) in abscissa and the thrust coefficient (KT), the torque coefficient multiplied by ten (KQ x 10) and the propeller efficiency ( ⁇ ) in ordinate.
  • Fig. 8 The relative positions of fins and the propeller blade roots are illustrated in Fig. 8, wherein the rear end O of one propeller blade root shown in the Fig. 6 is placed on the base line X, and the blade position is shown as a line segment starting from the base line X with an angle ⁇ and having a length corresponding to the length of the nose-tail line of the propeller blade root.
  • Another propeller blade root adjacent to said one also is shown is a similar manner, but at a peripheral distance between the rear ends of them taken in the direction of the base line X.
  • the positions of the fins are shown by taking "a" of the Fig. 6 in the direction of the base line X and "b" of the Fig.
  • the lengths of the fin segments correspond to the lengths of the crossing lines between the fins and the boss cap as shown in the Fig. 5 by broken lines. From the table 5 and the Fig. 8, it is understood that a considerable improvement of propeller efficiency can be obtained when the front ends of fins are placed between the adjacent propeller blade roots, that is, within a space between extended nose-tail lines of the adjacent propeller blade roots.
  • the relative positions of the propeller blade roots and the fins are shown in Fig. 13 by way of X-Y plane as in the Figs. 8-10.
  • the fins are located, in the case of fin number two, at the positions 1/F and 2/2; in the case of fin number three, at the positions 1/F, 2/3 and 3/3; in the case of fin number four, at the positions 1/F, 2/4, 3/4 and 4/4; and in the case of fin number five, at the positions 1/F, 2/5, 3/5, 4/5 and 5/5, as shown in the Fig. 13.
  • the maximum diameter of the fins should be greater than the diameter of the cap-mounting end of the boss and not be greater than 33% of the propeller diameter, in order to obtain a considerable improvement of the propeller efficiency.
  • the shape of fins is not limited to plane and may have a positive or a negative camber.
  • the propeller characteristics may greatly be improved only by a slight modification of a rather small boss cap and not by a drastic change of the screw propeller itself, to which the boss cap is appended, necessitating difficult work and high cost.
  • the present invention is applicable to screw propellers already mounted on existing ships, simply by exchanging or working the boss cap without incurring high cost.

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)
  • Mixers Of The Rotary Stirring Type (AREA)
EP87111052A 1986-07-31 1987-07-30 Schiffsschraubennabe mit Flossen Withdrawn EP0255136A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP18157786 1986-07-31
JP181577/86 1986-07-31
JP188898/86 1986-08-11
JP18889886 1986-08-11

Publications (1)

Publication Number Publication Date
EP0255136A1 true EP0255136A1 (de) 1988-02-03

Family

ID=26500707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111052A Withdrawn EP0255136A1 (de) 1986-07-31 1987-07-30 Schiffsschraubennabe mit Flossen

Country Status (7)

Country Link
EP (1) EP0255136A1 (de)
AU (1) AU593670B2 (de)
CA (1) CA1289821C (de)
FR (1) FR2619352A1 (de)
GB (1) GB2194295B (de)
HK (1) HK85092A (de)
SG (1) SG60592G (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2619352A1 (fr) * 1986-07-31 1989-02-17 Mitsui O S K Lines Ltd Chapeau de moyeu d'helice propulsive avec ailettes
EP0758606A1 (de) * 1995-08-16 1997-02-19 Schottel-Werft Josef Becker GmbH & Co KG. Nabenkappe für Schiffsschrauben
EP1306301A1 (de) 2001-10-26 2003-05-02 Howaldtswerke-Deutsche Werft Ag Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln
WO2004056654A1 (en) 2002-12-20 2004-07-08 Abb Oy Arrangement in a propulsion system
EP2594478A1 (de) 2011-11-18 2013-05-22 Becker Marine Systems GmbH & Co. KG Propelleranordnung, insbesondere für Wasserfahrzeuge
CN103115021A (zh) * 2013-02-01 2013-05-22 华中科技大学 一种叶轮装置
EP2593356A1 (de) * 2010-07-12 2013-05-22 Rolls-Royce Aktiebolag Antriebseinheit für ein wasserfahrzeug und wasserfahrzeug mit einer antriebseinheit
CN105377692A (zh) * 2014-05-28 2016-03-02 韩国海洋科学技术院 用于减少旋转流与桨毂涡旋(hub vortex)并提高推进效率的复合型螺旋桨毂帽
JP2019006169A (ja) * 2017-06-21 2019-01-17 ナカシマプロペラ株式会社 船舶用推進装置及びそれを備えた船舶

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2947357B2 (ja) * 1989-08-18 1999-09-13 日産自動車株式会社 高速艇のプロペラ構造
US5096383A (en) * 1989-11-02 1992-03-17 Deutsche Forschungsanstalt Fur Luft- Und Raumfahrt E.V. Propeller blades
US11713101B2 (en) 2020-12-04 2023-08-01 Jeffrey L. HATHAWAY Propeller hubcap

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB652441A (en) * 1948-05-19 1951-04-25 Edward Shellberg Air deflectors for airplane propellers
US2755868A (en) * 1953-09-17 1956-07-24 United Aircraft Corp Spinner construction for an aeronautical propeller
US3606579A (en) * 1969-01-22 1971-09-20 Henry Mehus Propeller
DE3037369A1 (de) * 1980-09-01 1982-03-11 Escher Wyss Gmbh, 7980 Ravensburg Schiffspropeller

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE606119C (de) * 1933-11-12 1934-11-24 Nicholas Wladimir Akimoff Einrichtung zur Erhoehung des Wirkungsgrades eines Schraubenpropellers
GB752765A (en) * 1953-09-17 1956-07-11 United Aircraft Corp Improvements in or relating to a spinner construction for an aeronautical propeller
BE789482A (fr) * 1971-10-04 1973-01-15 Gen Electric Construction d'ogive degivrante pour turbomachine
EP0255136A1 (de) * 1986-07-31 1988-02-03 Mitsui O.S.K. Lines, Ltd. Schiffsschraubennabe mit Flossen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB652441A (en) * 1948-05-19 1951-04-25 Edward Shellberg Air deflectors for airplane propellers
US2755868A (en) * 1953-09-17 1956-07-24 United Aircraft Corp Spinner construction for an aeronautical propeller
US3606579A (en) * 1969-01-22 1971-09-20 Henry Mehus Propeller
DE3037369A1 (de) * 1980-09-01 1982-03-11 Escher Wyss Gmbh, 7980 Ravensburg Schiffspropeller

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2619352A1 (fr) * 1986-07-31 1989-02-17 Mitsui O S K Lines Ltd Chapeau de moyeu d'helice propulsive avec ailettes
EP0758606A1 (de) * 1995-08-16 1997-02-19 Schottel-Werft Josef Becker GmbH & Co KG. Nabenkappe für Schiffsschrauben
EP1306301A1 (de) 2001-10-26 2003-05-02 Howaldtswerke-Deutsche Werft Ag Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln
DE10152977C1 (de) * 2001-10-26 2003-05-08 Howaldtswerke Deutsche Werft Vorrichtung zur Entgegenwirkung von im Nabenbereich von Propellern und/oder Propellerantrieben im umgebenden Fluid erzeugten Strömungswirbeln
WO2004056654A1 (en) 2002-12-20 2004-07-08 Abb Oy Arrangement in a propulsion system
EP2593356A1 (de) * 2010-07-12 2013-05-22 Rolls-Royce Aktiebolag Antriebseinheit für ein wasserfahrzeug und wasserfahrzeug mit einer antriebseinheit
EP2593356A4 (de) * 2010-07-12 2017-04-26 Rolls-Royce Aktiebolag Antriebseinheit für ein wasserfahrzeug und wasserfahrzeug mit einer antriebseinheit
DE102011055515A1 (de) 2011-11-18 2013-05-23 Becker Marine Systems Gmbh & Co. Kg Propelleranordnung, insbesondere für Wasserfahrzeuge
US20130129514A1 (en) * 2011-11-18 2013-05-23 Becker Marine Systems GmgH & Co. KG Propeller arrangement, in particular for watercraft
US9328613B2 (en) * 2011-11-18 2016-05-03 Becker Marine Systems Gmbh & Co Kg Propeller arrangement, in particular for watercraft
EP2594478A1 (de) 2011-11-18 2013-05-22 Becker Marine Systems GmbH & Co. KG Propelleranordnung, insbesondere für Wasserfahrzeuge
CN103115021A (zh) * 2013-02-01 2013-05-22 华中科技大学 一种叶轮装置
CN105377692A (zh) * 2014-05-28 2016-03-02 韩国海洋科学技术院 用于减少旋转流与桨毂涡旋(hub vortex)并提高推进效率的复合型螺旋桨毂帽
JP2019006169A (ja) * 2017-06-21 2019-01-17 ナカシマプロペラ株式会社 船舶用推進装置及びそれを備えた船舶

Also Published As

Publication number Publication date
FR2619352A1 (fr) 1989-02-17
GB2194295A (en) 1988-03-02
GB2194295B (en) 1991-03-20
AU7630187A (en) 1988-02-04
CA1289821C (en) 1991-10-01
HK85092A (en) 1992-11-13
AU593670B2 (en) 1990-02-15
GB8718165D0 (en) 1987-09-09
SG60592G (en) 1992-09-04

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Inventor name: SHIOTSU, TAKASHI

Inventor name: OUCHI, KAZUYUKI

Inventor name: KOHNO, YOSHIO

Inventor name: KOIZUKA, HAJIMEC/O WEST JAPAN FLUID

Inventor name: OGURA, MICHIHITOC/O WEST JAPAN FLUID

Inventor name: TAKESHITA, TOSHINORI