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GB2110307A - A ship's propellor having two or more perforated hollow blades - Google Patents

A ship's propellor having two or more perforated hollow blades Download PDF

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Publication number
GB2110307A
GB2110307A GB08232712A GB8232712A GB2110307A GB 2110307 A GB2110307 A GB 2110307A GB 08232712 A GB08232712 A GB 08232712A GB 8232712 A GB8232712 A GB 8232712A GB 2110307 A GB2110307 A GB 2110307A
Authority
GB
United Kingdom
Prior art keywords
propellor
ship
hub
hollow
passage
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
GB08232712A
Other versions
GB2110307B (en
Inventor
Geert Herman Vos
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.)
Noordvos Schroeven BV
Original Assignee
Noordvos Schroeven BV
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 Noordvos Schroeven BV filed Critical Noordvos Schroeven BV
Publication of GB2110307A publication Critical patent/GB2110307A/en
Application granted granted Critical
Publication of GB2110307B publication Critical patent/GB2110307B/en
Expired 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
    • C02F3/207—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors with axial thrust propellers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Microbiology (AREA)
  • Organic Chemistry (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Combustion & Propulsion (AREA)
  • Hydrology & Water Resources (AREA)
  • Ocean & Marine Engineering (AREA)
  • Catching Or Destruction (AREA)
  • Toys (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Screw Conveyors (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Wind Motors (AREA)

Abstract

Each blade 1 has perforations 2 on the lee side thereof and is connected via a passage 4 through the hub 3 with the thrust side of the propellor. This arrangement, which during rotation of the propellor causes water to flow from the thrust side of the propellor via the passage in the hub to the hollow space in the corresponding blade and thence via the perforations to the region at the lee side of the propellor, has been found to improve the propellor's efficiency in operation in a ship's propulsion mechanism. <IMAGE>

Description

SPECIFICATION A ship's propellor having two or more perforated hollow blades This invention relates to a ship's propellor having two or more hollow perforated blades mounted on a hub having a passage therein.
Netherlands patent application No. 76.01422 discloses a ship's propellor comprising hollow blades mounted around a hub, which blades are provided with perforations either on the thrust side or on the suction or lee side, and further each communicate via a corresponding passage provided in the hub with the drive shaft around which the hub is mounted, which shaft is also hollow. The hollow shaft is further connected to a source of gaseous, liquid, or powdered material.
Forming part of the propulsion mechanism of a ship, such a propellor is effective to achieve that as it rotates, either from excess pressure, or under the influence of suction action originating from the propellor during rotation, the materials referred to are transported via the hollow shaft and the passages provided in the hub to the hollow propellor blades, and to flow subsequently via the perforations into the ambient water to be dispersed therein.
It is an object of the present invention to provide a ship's propellor of the kind defined in the opening paragraph and having an improved efficiency with regard to the propulsion mechanism.
According to the present invention, there is provided a ship's propellor which is characterized in that each hollow blade is perforated at the lee side thereof, and via a passage through the hub is connected with the thrust side of the propellor.
During the rotation of the ship's propellor according to the invention, which is mounted around a normal solid shaft, in any case one through which no materials are admitted to the hollows of the propellor blades during rotation, water flows from the region at the thrust side of the propellor via the passage through the hub to the hollow space in the corresponding propellor blade and thence via the perforations to the region at the lee side of the propellor. It has been found that this water recycling is accompanied by a considerable improvement of the efficiency of the propellor's operation which depends on the rate of rotation and is noticeable from fuel consumption, the ship's velocity, and tractive power.
In one embodiment of the propellor according to the invention, and one which is advantageous for the improvement in efficiency of the propellor's operation, each passage through the hub at the thrust side of the propellor is directed substantially parallel to the axis of rotation.
In an effective embodiment, the perforations at the lee side of the propellor blades are provided parallel to and, as viewed in the direction of rotation of the propellor, just behind the tractrix. It is conceded that such a feature is known per se from Netherlands patent application 7803906.
That, however, concerns a propellor with which a gaseous, powdered or liquid material is dispersed in a liquid using imploding cavities. The present invention, on the other hand, relates to a propellor serving for the propulsion of a ship.
It has been experimentally determined by means of a ship in practice that, under comparable conditions a propellor according to the invention, which had three blades, resulted in a considerable improvement in propulsion efficiency as compared with an identical propellor but without perforations in the blades and without the presence of a passage in the propellor's hub.
The improvement in efficiency under the selected test conditions depended on the rate of rotation of the propellor in the sense that after passing through a maximum the efficiency decreased when the speed was increased further. In the range of 250-350 r.p.m. measured by the ship's velocity an improvement of approximately 8~6% could be determined with the propellor according to the invention; measured by the tractive force an improvement of about 39-16%; and when fuel consumption was calculated as a function of the ship's velocity the propellor according to the invention exhibited an improvement relative to the normal propellor of about 7 to 8% on average.
One embodiment of the ship's propellor according to the invention will now be described, by way of example, with reference to the accompanying drawing, which shows an axial view of the propellor according to the invention from the lee side thereof.
In the drawing, 1 designates a hollow propellor blade which is provided with perforations 2 parallel to the tractrix 5. The propellor blade is connected to a hub 3 provided with a passage 4, which connects the thrust side region of the propellor with the hollow space of the propellor blade.
Naturally the ship's propellor as described hereinbefore and shown in the drawing can be modified without departing from the scope of the invention. Thus the shape and the number of perforation, the shape of the cavity in a propellor blade, and the shape and dimensions of the passage through the hub can be adapted in order to reduce flow resistance for the water being recycled.
Claims
1. A ship's propellor comprising two or more hollow perforated blades mounted on a hub having a passage therein, characterized in that each hollow blade is perforated at the lee side thereof, and via a passage through the hub is connected with the thrust side of the propellor.
2. A propellor according to claim 1, characterized in that each passage through the hub at the thrust side of the propellor is directed substantially parallel to the axis of rotation.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A ship's propellor having two or more perforated hollow blades This invention relates to a ship's propellor having two or more hollow perforated blades mounted on a hub having a passage therein. Netherlands patent application No. 76.01422 discloses a ship's propellor comprising hollow blades mounted around a hub, which blades are provided with perforations either on the thrust side or on the suction or lee side, and further each communicate via a corresponding passage provided in the hub with the drive shaft around which the hub is mounted, which shaft is also hollow. The hollow shaft is further connected to a source of gaseous, liquid, or powdered material. Forming part of the propulsion mechanism of a ship, such a propellor is effective to achieve that as it rotates, either from excess pressure, or under the influence of suction action originating from the propellor during rotation, the materials referred to are transported via the hollow shaft and the passages provided in the hub to the hollow propellor blades, and to flow subsequently via the perforations into the ambient water to be dispersed therein. It is an object of the present invention to provide a ship's propellor of the kind defined in the opening paragraph and having an improved efficiency with regard to the propulsion mechanism. According to the present invention, there is provided a ship's propellor which is characterized in that each hollow blade is perforated at the lee side thereof, and via a passage through the hub is connected with the thrust side of the propellor. During the rotation of the ship's propellor according to the invention, which is mounted around a normal solid shaft, in any case one through which no materials are admitted to the hollows of the propellor blades during rotation, water flows from the region at the thrust side of the propellor via the passage through the hub to the hollow space in the corresponding propellor blade and thence via the perforations to the region at the lee side of the propellor. It has been found that this water recycling is accompanied by a considerable improvement of the efficiency of the propellor's operation which depends on the rate of rotation and is noticeable from fuel consumption, the ship's velocity, and tractive power. In one embodiment of the propellor according to the invention, and one which is advantageous for the improvement in efficiency of the propellor's operation, each passage through the hub at the thrust side of the propellor is directed substantially parallel to the axis of rotation. In an effective embodiment, the perforations at the lee side of the propellor blades are provided parallel to and, as viewed in the direction of rotation of the propellor, just behind the tractrix. It is conceded that such a feature is known per se from Netherlands patent application 7803906. That, however, concerns a propellor with which a gaseous, powdered or liquid material is dispersed in a liquid using imploding cavities. The present invention, on the other hand, relates to a propellor serving for the propulsion of a ship. It has been experimentally determined by means of a ship in practice that, under comparable conditions a propellor according to the invention, which had three blades, resulted in a considerable improvement in propulsion efficiency as compared with an identical propellor but without perforations in the blades and without the presence of a passage in the propellor's hub. The improvement in efficiency under the selected test conditions depended on the rate of rotation of the propellor in the sense that after passing through a maximum the efficiency decreased when the speed was increased further. In the range of 250-350 r.p.m. measured by the ship's velocity an improvement of approximately 8~6% could be determined with the propellor according to the invention; measured by the tractive force an improvement of about 39-16%; and when fuel consumption was calculated as a function of the ship's velocity the propellor according to the invention exhibited an improvement relative to the normal propellor of about 7 to 8% on average. One embodiment of the ship's propellor according to the invention will now be described, by way of example, with reference to the accompanying drawing, which shows an axial view of the propellor according to the invention from the lee side thereof. In the drawing, 1 designates a hollow propellor blade which is provided with perforations 2 parallel to the tractrix 5. The propellor blade is connected to a hub 3 provided with a passage 4, which connects the thrust side region of the propellor with the hollow space of the propellor blade. Naturally the ship's propellor as described hereinbefore and shown in the drawing can be modified without departing from the scope of the invention. Thus the shape and the number of perforation, the shape of the cavity in a propellor blade, and the shape and dimensions of the passage through the hub can be adapted in order to reduce flow resistance for the water being recycled. Claims
1. A ship's propellor comprising two or more hollow perforated blades mounted on a hub having a passage therein, characterized in that each hollow blade is perforated at the lee side thereof, and via a passage through the hub is connected with the thrust side of the propellor.
2. A propellor according to claim 1, characterized in that each passage through the hub at the thrust side of the propellor is directed substantially parallel to the axis of rotation.
3. A propellor according to claim 1 or 2, characterized in that the perforations are disposed parallel to, and, as viewed in the direction of rotation of the propellor, just behind the tractrix.
GB08232712A 1981-11-20 1982-11-16 A ship's propellor having two or more perforated hollow blades Expired GB2110307B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8105275A NL8105275A (en) 1981-11-20 1981-11-20 SHIP SCREW, PROVIDED WITH TWO OR MORE PERFORATED HOLLOW BLADES.

Publications (2)

Publication Number Publication Date
GB2110307A true GB2110307A (en) 1983-06-15
GB2110307B GB2110307B (en) 1985-01-30

Family

ID=19838424

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08232712A Expired GB2110307B (en) 1981-11-20 1982-11-16 A ship's propellor having two or more perforated hollow blades

Country Status (14)

Country Link
BE (1) BE895081A (en)
DE (1) DE3242589A1 (en)
DK (1) DK508982A (en)
ES (1) ES275637Y (en)
FI (1) FI823935L (en)
FR (1) FR2516890A1 (en)
GB (1) GB2110307B (en)
GR (1) GR76737B (en)
IE (1) IE53509B1 (en)
IT (1) IT1153059B (en)
NL (1) NL8105275A (en)
NO (1) NO823840L (en)
PT (1) PT75872B (en)
SE (1) SE8206578L (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003013954A1 (en) * 2001-08-08 2003-02-20 Robin David Shaw Cavitation alleviation and line cutting device
EP1543241A1 (en) 2002-09-27 2005-06-22 Marine Current Turbines Limited Fatigue resistant large hollow rotor blade for underwater energy converter
WO2008040049A1 (en) * 2006-10-02 2008-04-10 Colin David Chamberlain Safety propeller
US8062083B2 (en) 2006-09-11 2011-11-22 Ambassador Marine Limited Line cutter
RU2539870C1 (en) * 2013-09-30 2015-01-27 Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Дальневосточный Федеральный Университет" (Двфу) Propeller screw
CN105221321A (en) * 2014-06-25 2016-01-06 上海电气风电设备有限公司 The open blade structure of ocean current power generation unit inner chamber

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU708767C (en) * 1997-04-14 2002-08-29 Chi Keung Leung Improved fluid displacing blade
AUPO620197A0 (en) 1997-04-14 1997-05-08 Leung, Chi Keung Extra byte propeller

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB291281A (en) * 1927-10-29 1928-05-31 William Lovis Improvements in or relating to ships' propellers
GB396716A (en) * 1932-02-08 1933-08-08 Edward Ernest Tully Improvements in or relating to ships' propellers
GB400913A (en) * 1932-01-29 1933-11-02 Louis Jauch Improvements in hydraulic or aerial propellers or receivers
GB1200162A (en) * 1966-05-24 1970-07-29 Robert Filmer Bridgland Improvements in blades for screw-propellers and lifting rotors

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE17146C (en) * FR. WREDE in Duisburg, Crefelderstr. 20 Ship propellers with hollow wings, the cavity of which communicates with the surrounding water
GB191206468A (en) * 1912-03-15 1912-05-23 Wynford Brierley Improvements in Propellers and Fans.
US1604994A (en) * 1925-08-31 1926-11-02 Patrick P Grosso Propeller
US1666517A (en) * 1927-01-25 1928-04-17 Tully Edward Ernest Propelling device for ships
US2511156A (en) * 1946-08-07 1950-06-13 Richard J Glass Propeller
NL7803906A (en) * 1978-04-12 1979-10-16 Noordvos Schroeven Bv METHOD, DEVICE AND PROPELLER FOR DISTRIBUTING A GAS, POWDER OR LIQUID MATERIAL IN A LIQUID.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB291281A (en) * 1927-10-29 1928-05-31 William Lovis Improvements in or relating to ships' propellers
GB400913A (en) * 1932-01-29 1933-11-02 Louis Jauch Improvements in hydraulic or aerial propellers or receivers
GB396716A (en) * 1932-02-08 1933-08-08 Edward Ernest Tully Improvements in or relating to ships' propellers
GB1200162A (en) * 1966-05-24 1970-07-29 Robert Filmer Bridgland Improvements in blades for screw-propellers and lifting rotors

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003013954A1 (en) * 2001-08-08 2003-02-20 Robin David Shaw Cavitation alleviation and line cutting device
US7134837B2 (en) 2001-08-08 2006-11-14 Robin David Shaw Cavitation alleviation and line cutting device
EP1543241A1 (en) 2002-09-27 2005-06-22 Marine Current Turbines Limited Fatigue resistant large hollow rotor blade for underwater energy converter
US8062083B2 (en) 2006-09-11 2011-11-22 Ambassador Marine Limited Line cutter
WO2008040049A1 (en) * 2006-10-02 2008-04-10 Colin David Chamberlain Safety propeller
JP2010505679A (en) * 2006-10-02 2010-02-25 デイビッド チェンバレン、コリン Safety propeller
US8491268B2 (en) 2006-10-02 2013-07-23 Colin David Chamberlain Safety propeller
TWI410356B (en) * 2006-10-02 2013-10-01 David Chamberlain Colin Safety propeller for ship
RU2539870C1 (en) * 2013-09-30 2015-01-27 Федеральное Государственное Автономное Образовательное Учреждение Высшего Профессионального Образования "Дальневосточный Федеральный Университет" (Двфу) Propeller screw
CN105221321A (en) * 2014-06-25 2016-01-06 上海电气风电设备有限公司 The open blade structure of ocean current power generation unit inner chamber

Also Published As

Publication number Publication date
IE822759L (en) 1983-05-20
PT75872B (en) 1985-01-09
ES275637Y (en) 1984-10-01
FI823935L (en) 1983-05-21
GB2110307B (en) 1985-01-30
FR2516890A1 (en) 1983-05-27
IT8224301A0 (en) 1982-11-17
IT1153059B (en) 1987-01-14
IE53509B1 (en) 1988-11-23
DK508982A (en) 1983-05-21
SE8206578D0 (en) 1982-11-18
BE895081A (en) 1983-05-24
NO823840L (en) 1983-05-24
GR76737B (en) 1984-08-30
DE3242589A1 (en) 1983-05-26
IT8224301A1 (en) 1984-05-17
PT75872A (en) 1982-12-01
SE8206578L (en) 1983-05-21
FI823935A0 (en) 1982-11-17
NL8105275A (en) 1983-06-16
ES275637U (en) 1984-03-01

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee