EP2738084B1 - Propeller with small duct, and ship - Google Patents

Propeller with small duct, and ship Download PDF

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Publication number
EP2738084B1
EP2738084B1 EP12817040.4A EP12817040A EP2738084B1 EP 2738084 B1 EP2738084 B1 EP 2738084B1 EP 12817040 A EP12817040 A EP 12817040A EP 2738084 B1 EP2738084 B1 EP 2738084B1
Authority
EP
European Patent Office
Prior art keywords
propeller
duct
diameter
ship
pitch
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.)
Active
Application number
EP12817040.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2738084A1 (en
EP2738084A4 (en
Inventor
Noriyuki Sasaki
Hideki Kawashima
Junichi Fujisawa
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.)
National Institute of Maritime Port and Aviation Technology
Original Assignee
National Institute of Maritime Port and Aviation Technology
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 National Institute of Maritime Port and Aviation Technology filed Critical National Institute of Maritime Port and Aviation Technology
Priority to EP18215036.7A priority Critical patent/EP3495257B1/en
Publication of EP2738084A1 publication Critical patent/EP2738084A1/en
Publication of EP2738084A4 publication Critical patent/EP2738084A4/en
Application granted granted Critical
Publication of EP2738084B1 publication Critical patent/EP2738084B1/en
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Anticipated expiration legal-status Critical

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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
    • B63H1/26—Blades

Definitions

  • the present invention relates to a propeller setting a small duct includes a propeller which is mounted on a stern of a ship's hull and a duct which is provided in front of the propeller, and a ship including a propeller setting the small duct.
  • the intermediate duct placed in front of the propeller and having a diameter slightly smaller than that of the propeller is handled as an energy-saving device and is not regarded as a propulsor. This is because that interference between the duct and the propeller is not so large, and interference between a ship's hull and the duct is larger than the former interference.
  • a resistance test is carried out in a state where the duct is mounted on the ship's hull. This is based on recognition that the duct is part of the ship's hull.
  • the maximum value of the pitch is set to 120% or more and 160% or less of the minimum value of the pitch. According to this aspect, it is possible to enhance the suction effect at the center portion of the propeller, and an optimal load distribution can be obtained.
  • a distance between a rear end of the duct and a front edge of the propeller is set to 0.5% or more and less than 10% of the diameter of the propeller.
  • the duct can be brought close to the propeller without generating separation caused by the suction effect of the decreasing pitch propeller, and it is possible to enhance the interference effect between the duct and the propeller.
  • the strut in the propeller setting the small duct of the eighth aspect, the strut also functions as the fixed blade, and the strut is twisted in a direction opposite from a rotation direction of the propeller. According to this aspect, the flow is rotated by the strut, the strut also functions as a fixed blade, and a structure is simplified.
  • a tenth aspect of the invention provides a ship comprising the propeller setting the small duct according to any one of the first to ninth aspects. According to this aspect, it is possible to provide a ship having high propulsive efficiency in an actual sea where a propeller loading is increased.
  • the center of the duct and the axis of the propeller match with each other, it is possible to easily produce and install the duct and to inexpensively provide the duct, as compared with a duct which is asymmetric with respect to its axis, a duct which is installed such that a center shaft of the duct is offset from a propeller shaft, or a duct which is installed with inclination angle.
  • an inner surface of the duct has a fixed blade which forms a flow into the propeller as a counterflow, the flow which flows into the duct flows into the propeller by the fixed blade as the counterflow, and it is possible to further enhance the propeller efficiency.
  • the strut also functions as the fixed blade and the strut is twisted in a direction opposite from a rotation direction of the propeller, the flow is rotated by the strut, the strut also functions as the fixed blade, and a structure is simplified.
  • the ship of the present invention it is possible to provide a ship having high propulsive efficiency especially in an actual sea where a propeller loading is increased.
  • the ship includes a propeller 10 mounted on a stern of a ship's hull 1, and a duct 20 mounted in front of the propeller 10.
  • a diameter of the propeller 10 is defined as Dp
  • a diameter of the front end 21 of the duct 20 is defined as Ddin
  • a diameter of the rear end 22 of the duct 20 is defined as Ddout
  • a distance between the front edge of the propeller 10 and the rear end 22 of the duct 20 is defined as L. It is preferable that the diameter Ddin of the front end 21 of the duct 20 is 50% or less of the diameter Dp of the propeller 10, the distance L between the rear end 22 of the duct 20 and the front edge of the propeller 10 is 15% or less or less than 10% of the diameter Dp of the propeller 10.
  • the distance L between the rear end 22 of the duct 20 and the front edge of the propeller 10 is as short as possible, but to avoid contact between the duct 20 and the propeller 10, it is preferable that the distance L is set to 0.5% or more of the diameter Dp of the propeller 10.
  • the duct 20 is formed symmetrically with respect to its axis. Since the duct 20 is mounted such that a drive shaft 10a of the propeller 10 and a center shaft of the duct 20 match with each other, it is possible to easily produce and install the duct 20 and to inexpensively provide the duct 20 as compared with a duct which is asymmetric with respect to its axis, a duct which is installed such that a center shaft of the duct is offset from a propeller shaft, or a duct which is installed with inclination angle.
  • the duct 20 is mounted on a ship's hull end 1a which covers a stern tube 10b by struts 20a, 20b, 20c and 20d.
  • the stern tube 10b is provided around the drive shaft 10a of the propeller 10.
  • the duct 20 may be mounted directly on the stern tube 10b by the struts 20a, 20b, 20c and 20d.
  • the duct 20 may be mounted on both the stern tube 10b and the ship's hull end 1a by the struts 20a, 20b, 20c and 20d.
  • strut 20e It is possible to provide the strut 20e outside the duct 20, and a fixed blade which rotates the flow may be provided on an inner surface of the duct 20, but since the strut 20e rotates the flow, the strut 20e functions as the fixed blade, and a structure is simplified.
  • Figs. 7 and 8 show results of a propeller loading changing test in which decrease in speed of the ship during waves is simulated.
  • Fig. 7 is a graph showing the propulsion efficiency when the distance between the front edge of the propeller and the rear end of the duct is changed and when the duct is not provided.
  • Fig. 8 is a graph showing the propulsion variation when the distance between the front edge of the propeller and the rear end of the duct is changed.
  • a lateral axis shows a ship speed ratio
  • a vertical axis shows propulsion efficiency
  • the propulsion efficiencies when the ship speed ratio is reduced to 0.75 are compared with each other.
  • the pitch H of the propeller 10 is the decreasing pitch in which the pitch H becomes the maximum value at the blade root of the propeller 10 and becomes the minimum value at the blade tip.

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)
EP12817040.4A 2011-07-26 2012-07-26 Propeller with small duct, and ship Active EP2738084B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18215036.7A EP3495257B1 (en) 2011-07-26 2012-07-26 Propeller setting small duct, and ship

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011163203 2011-07-26
PCT/JP2012/004777 WO2013014938A1 (ja) 2011-07-26 2012-07-26 小型ダクト付きプロペラ及び船舶

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP18215036.7A Division EP3495257B1 (en) 2011-07-26 2012-07-26 Propeller setting small duct, and ship

Publications (3)

Publication Number Publication Date
EP2738084A1 EP2738084A1 (en) 2014-06-04
EP2738084A4 EP2738084A4 (en) 2015-04-08
EP2738084B1 true EP2738084B1 (en) 2019-01-02

Family

ID=47600800

Family Applications (2)

Application Number Title Priority Date Filing Date
EP12817040.4A Active EP2738084B1 (en) 2011-07-26 2012-07-26 Propeller with small duct, and ship
EP18215036.7A Active EP3495257B1 (en) 2011-07-26 2012-07-26 Propeller setting small duct, and ship

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP18215036.7A Active EP3495257B1 (en) 2011-07-26 2012-07-26 Propeller setting small duct, and ship

Country Status (5)

Country Link
EP (2) EP2738084B1 (ja)
JP (1) JP5230852B1 (ja)
KR (3) KR102037018B1 (ja)
CN (2) CN107089313B (ja)
WO (1) WO2013014938A1 (ja)

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KR102037018B1 (ko) * 2011-07-26 2019-11-26 고쿠리츠겐큐카이하츠호진 가이죠·고완·고쿠기쥬츠겐큐죠 소형 덕트가 달린 프로펠러 및 선박
WO2014115567A1 (ja) * 2013-01-25 2014-07-31 独立行政法人海上技術安全研究所 小型ダクト付き船舶及び船舶への小型ダクト適用判断方法
JP6376679B2 (ja) * 2013-12-16 2018-08-22 国立研究開発法人 海上・港湾・航空技術研究所 船尾用ダクト、船尾用ダクトの設計方法、及び船尾用ダクトを装備した船舶
CN104787284A (zh) * 2015-04-08 2015-07-22 浙江海洋学院 子母共轴导管轮螺旋桨
CN104828225A (zh) * 2015-05-14 2015-08-12 广西梧州运龙港船机械制造有限公司 船用螺旋桨
JP6621911B2 (ja) * 2016-03-14 2019-12-18 ジャパンマリンユナイテッド株式会社 揚力発生体
CN109070982A (zh) * 2016-03-29 2018-12-21 日本日联海洋株式会社 船舶的推进装置
KR101894019B1 (ko) * 2017-01-12 2018-09-03 성동조선해양 주식회사 환형 구조물을 포함하는 전류고정날개
CN112078770B (zh) * 2019-11-14 2021-08-03 浙江大学 一种全导管式双级吊舱推进器及其设计方法
CN115140282A (zh) * 2022-05-31 2022-10-04 中国船舶重工集团公司第七一九研究所 抗空化推进器及推进系统

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KR102037018B1 (ko) * 2011-07-26 2019-11-26 고쿠리츠겐큐카이하츠호진 가이죠·고완·고쿠기쥬츠겐큐죠 소형 덕트가 달린 프로펠러 및 선박

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Also Published As

Publication number Publication date
KR20190121878A (ko) 2019-10-28
KR101917408B1 (ko) 2018-11-09
KR102144840B1 (ko) 2020-08-14
EP3495257A1 (en) 2019-06-12
KR102037018B1 (ko) 2019-11-26
CN107089313B (zh) 2019-05-17
EP3495257B1 (en) 2020-04-15
EP2738084A1 (en) 2014-06-04
KR20180089554A (ko) 2018-08-08
WO2013014938A1 (ja) 2013-01-31
JPWO2013014938A1 (ja) 2015-02-23
JP5230852B1 (ja) 2013-07-10
CN103717488A (zh) 2014-04-09
KR20140068034A (ko) 2014-06-05
CN103717488B (zh) 2016-10-26
CN107089313A (zh) 2017-08-25
EP2738084A4 (en) 2015-04-08

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