EP2923942A1 - Bugstrahlrudersystem - Google Patents

Bugstrahlrudersystem Download PDF

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Publication number
EP2923942A1
EP2923942A1 EP14162417.1A EP14162417A EP2923942A1 EP 2923942 A1 EP2923942 A1 EP 2923942A1 EP 14162417 A EP14162417 A EP 14162417A EP 2923942 A1 EP2923942 A1 EP 2923942A1
Authority
EP
European Patent Office
Prior art keywords
passage
tunnel thruster
thruster system
deflector
water jet
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Withdrawn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
EP14162417.1A
Other languages
English (en)
French (fr)
Inventor
Simon Toernros
Conny Thyberg
Magnus Pettersson
Olof Klerebrant Klasson
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.)
Caterpillar Propulsion Production AB
Original Assignee
Caterpillar Propulsion Production AB
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 Caterpillar Propulsion Production AB filed Critical Caterpillar Propulsion Production AB
Priority to EP14162417.1A priority Critical patent/EP2923942A1/de
Priority to PCT/EP2015/000653 priority patent/WO2015144311A1/en
Publication of EP2923942A1 publication Critical patent/EP2923942A1/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Withdrawn legal-status Critical Current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
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers

Definitions

  • the present disclosure relates to a thruster system for a vessel. More particularly, the present disclosure relates to a tunnel thruster system including a passage extending through a hull segment of a vessel.
  • tunnel thrusters For improving maneuverability of a vessel, so-called tunnel thrusters (also referred to as transverse thrusters in literature) can be provided in a hull structure of the vessel.
  • tunnel thruster systems include a passage (tunnel) extending through a hull segment of the hull structure, for example in a transverse direction with respect to a vessel longitudinal axis.
  • those tunnel thruster systems are positioned in a bow region and/or a stem region of the vessel.
  • a propeller unit of the tunnel thruster system generates a water jet through the passage if activated. That water jet exits the passage in a starboard or port direction of the vessel, and, thus, causes a steering force that allows maneuvering the vessel without travelling forward or aft.
  • EP 2 305 558 A1 discloses a tunnel thruster system for a vessel.
  • the tunnel thruster system includes a thruster propulsion mechanism including a drive unit driving a transmission and propeller assembly located within a thruster tunnel.
  • the thruster tunnel comprises a propeller section, and first and second tapered tunnel sections interconnected with one another by the propeller section.
  • the propeller section and the first and the second tapered tunnel sections are oriented substantially transversely to a keel of the vessel and accommodate the transmission and propeller assembly.
  • Each tapered tunnel section extends from the propeller section to a tunnel opening through a hull of the vessel.
  • the present disclosure is directed, at least in part, to improving or overcoming one or more aspects of prior devices.
  • a tunnel thruster system may comprise a hull segment extending along a longitudinal axis of a vessel and defining a passage therethrough.
  • the tunnel thruster system may further comprise a propeller unit disposed in the passage and configured to generate a water jet in a first direction through the passage.
  • the tunnel thruster system may further comprise at least one deflector disposed in the passage and configured to deflect at least part of the water jet in a second direction different from the first direction.
  • a vessel in another aspect of the present disclosure, may include a tunnel thruster system that may comprise a hull segment extending along a longitudinal axis of the vessel and may define a passage therethrough.
  • the tunnel thruster system may further comprise a propeller unit disposed in the passage and configured to generate a water jet in a first direction through the passage.
  • the tunnel thruster system may further comprise at least one deflector disposed in the passage and configured to deflect at least part of the water jet in a second direction different from the first direction.
  • a water jet generated by a tunnel thruster may be negatively affected by the vessel itself.
  • the water jet may at least partly impinge on a flow obstacle being part of the vessel such as a fin or a rudder.
  • a counterforce against the desired steering force may be generated that negatively affects maneuverability of the vessel.
  • the water jet may be deflected by the hull structure in a manner causing disturbances during steering.
  • two tunnel thruster systems in a vessel may be arranged such that one tunnel thruster system negatively affects the other one.
  • two tunnel thruster systems may each include a passage. Both passages longitudinally extend along the same axis. If both tunnel thrusters systems are activated to generate a water jet in the same direction, the water jet of a first tunnel thruster systems is directed to the second tunnel thruster system. That water jet impinges on the second tunnel thruster system, and partially enters the passage of the second tunnel thruster system. Thus, generation of a water jet by the second tunnel thruster system may be negatively affected due to a higher inflow velocity.
  • exemplary vessel including a plurality of tunnel thruster systems is described with reference to Fig. 1 .
  • exemplary tunnel thruster systems are described in more detail with reference to Figs. 2 to 4 .
  • FIG. 1 schematically shows a vessel in a side view.
  • the vessel is referred to in its entirety by reference numeral 1.
  • Vessel 1 extends from a stem 2 to a bow 4 along a vessel longitudinal axis A.
  • Vessel 1 includes a main propeller 6 for propelling vessel 1 in a forward direction, and a rudder 8 for steering vessel 1 during forward travel. Both main propeller 6 and rudder 8 are disposed at stem 2.
  • vessel 1 includes a plurality of tunnel thruster systems (transverse thruster systems) 10, two of which being provided at stem 2, the other two being provided at bow 4.
  • vessel 1 may include more or less tunnel thruster system 10.
  • Tunnel thruster systems 10 are transversely provided in a hull structure 12 of vessel 1 with respect to vessel longitudinal axis A. Particularly, tunnel thruster systems 10 are provided in hull segments of hull structure 12, the hull segments extending along vessel longitudinal axis A, and tunnel thruster systems 10 being provided transversely with respect to vessel longitudinal axis A. As a result, tunnel thruster systems 10 extend between a port side and a starboard side of vessel 1 in the shown configuration of Fig. 1 . If activated, tunnel thruster systems 10 generate a water jet resulting in a steering force which facilitate steering of vessel 1 without travelling forward or aft.
  • a passage of the tunnel thruster system 10 may extend through a hull segment of hull structure 12, for example, under an angle to vessel longitudinal axis A other than 180°, particularly within a range of 90° ⁇ 30 °.
  • tunnel thruster systems 10 at stem 2 are partially covered by a fin 14 of hull structure 12.
  • fin 14 may be provided in hull structure 12 for increasing stability of vessel 1, and/or to increase flow properties of vessel 1.
  • tunnel thruster systems 10 at stem 2 are provided with a deflector 26 for deflecting a water jet as is also described in greater detail hereinafter.
  • FIG. 2 a tunnel thruster system 10 and flow obstacles 16, 17 (schematically indicated by dashed squares in Fig. 2 ) are depicted.
  • Tunnel thruster system 10 includes a hull segment 18 with a passage (tunnel) 20. Additionally, tunnel thruster system 10 comprises a propeller unit 22 disposed in passage 20, and deflectors 24, 26 also disposed in passage 20.
  • Hull segment 18 forms part of hull structure 12 of vessel 1.
  • hull segment 18 defines passage 20 that extends through hull segment 18 along a passage central longitudinal axis B.
  • passage 20 extends between a first opening 28 in an outer face of hull segment 18 and a second opening 30 in an outer face of hull segment 18.
  • passage central longitudinal axis B may run in a direction perpendicular to vessel longitudinal axis A.
  • passage 20 may have a constant diameter along central longitudinal axis B, or may have a changing diameter along central longitudinal axis B, for example at least partially tapering to a middle section that accommodates propeller unit 22.
  • Propeller unit 22 is capable to generate a water jet through passage 20 for steering vessel 1 without contributing to a forward or aft travel of vessel 1.
  • Propeller unit 22 is driven by a drive unit (not shown in further detail in Fig. 2 ) to which propeller unit 22 is connected, for example via a transmission unit (also not shown in Fig. 2 ).
  • Said drive unit may be, for example, an electric drive.
  • propeller unit 22 comprises one propeller with four propeller blades.
  • propeller unit 22 may comprise more than one propeller, each propeller may be equipped with any number of propeller blades.
  • propeller unit 22 may generate a water jet in a first direction, for example a starboard side direction. That water jet exits passage 20 through second opening 30 in hull segment 18.
  • propeller unit 22 may generate a water jet in a second direction, which is oppositely directed to the first direction.
  • the second direction may be a port side direction. That water jet exits passage 20 through first opening 28.
  • such a reversal of a water jet direction may be performed by reversing a rotational direction of propeller unit 22, and/or by varying a propeller blade pitch of propeller unit 22. In the latter case, a so-called variable pitch propeller may be used as propeller unit 22.
  • propeller unit 22 may be capable to generate a water jet in one direction only without the possibility to reverse the same.
  • the water jet upon generation by propeller unit 22, the water jet is directed in a first direction to either a first or a second flow obstacle 16, 17.
  • Flow obstacles 16, 17 may be any part of vessel 1 being at least partially disposed in the first direction of the water jet generated by propeller unit 22 and flowing through passage 20 before passing deflector 26 or 28.
  • flow obstacles 16, 17 may be a fin structure (as schematically indicated in Fig. 1 by reference numeral 14), a rudder, a propeller, a driving shaft for a propeller, another tunnel thruster system, or any other structure of vessel 1, which may interfere a water jet generated by tunnel thruster system 10.
  • a first and a second deflector 24, 26 are disposed in passage 20 of tunnel thruster system 10. Both deflectors 24, 26 are configured to deflect at least part of the water jet in a second direction different from the first direction as the water jet would otherwise impinge at least in part on respective flow obstacle 16, 17.
  • only one deflector may be disposed in passage 20.
  • position of tunnel thruster system 10 and configuration of vessel 1 may be such that only one flow obstacle 16 or 17 exists in the first direction.
  • propeller unit 22 may be capable to generate a water jet in one direction only, in which - downstream of propeller unit 22 - a deflector may be disposed in passage 20.
  • deflectors 24, 26 deflect the water jet in a downward direction (indicated by solid lines 36, 38 in Fig. 2 ) to guide the water jet at least partially around respective flow obstacle 16, 17. Additionally or alternatively, deflectors 24, 26 may deflect the water jet in any other direction such as a sideward direction, and/or an upward direction with respect to the first direction of the water jet before passing respective deflector 24, 26. In particular, the deflection direction caused by deflector 24, 26 may be set depending on the position, dimension, orientation and shape of flow obstacle 16, 17.
  • deflectors 24, 26 may not deflect the entire water jet, but only part of it. Specifically, that part of the water jet may be deflected, which would otherwise impinge on flow obstacle 16, 17. Deflectors 24, 26 may only partly extend across a cross sectional area of passage 20 when viewed in direction along central longitudinal axis B. For example, deflectors 24, 26 may extend across three-quarters (3/4), two-thirds (2/3), one-half (1/2), one-third (1/3), or one-quarter (1/4) of a cross sectional area of passage 20 when viewed in direction along central longitudinal axis B.
  • the strength or extent of the water jet deflection caused by deflector 24, 26 can be represented by an angle ⁇ confined between the first direction of respective undeflected theoretical water jet 32, 34 and the second direction of respective deflected water jet 36, 38.
  • Angle ⁇ is greater than 0° such as within a range between 3° to 45°, particularly within a range between 5° to 20°, more particularly about 12°.
  • deflectors 24, 26 comprise a plurality of spaced apart deflector plates 40 and 42, respectively.
  • Said plates 40, 42 may be arranged in parallel and may have any outer shape and/or inclination angle for deflecting the water jet.
  • those deflector plates may have a flat outer shape as illustrated for plates 42 in Fig. 2 , or may have a curved outer shape as illustrated for plates 40 in Fig. 2 .
  • deflector plates having different shapes may be integrated in the same deflector.
  • Neighboring deflector plates 40, 42 may be spaced apart from one another within a millimeter or centimeter range, for example, between 10 cm and 25 cm. Further, deflector plates 40, 42 may be made of a steel alloy, composite, polymer, or bronze.
  • plates 40, 42 may radially extend from central longitudinal axis B of passage 20, for example in a horizontal direction (as depicted in Fig. 2 ), in a vertical direction, and/or in any diagonal direction.
  • Deflector plates 40, 42 are connected to an inner face of passage 20, and, thus, to hull segment 18.
  • deflector 24 and/or 26 may be configured to not equally deflect its respective water jet, but to deflect part of the water jet stronger than a remaining part of the same water jet.
  • plates 40, 42 of respective deflectors 24, 26 may not be equally inclined, and/or not equally curved.
  • deflectors 24, 26 may split the water jet into two or more jets with different flow directions.
  • deflectors 24, 26 may deflect at least part of the water jet in a third direction different from both the first direction and the second direction.
  • plates 40, 42 of respective deflectors 24, 26 may not be equally inclined, and/or not equally curved.
  • Splitting into two water jets may be facilitated, for example, by providing a first subgroup of plates 40, 42 and a second subgroup of plates 40, 42. That first subgroup may have an inclination and/or curved outer shape deflecting the part of the water jet passing the first subgroup in another direction than the second subgroup deflecting the remaining part of the water jet.
  • the first subgroup may deflect part of the water jet in a downward direction
  • the second subgroup may deflect part of the water jet in any other direction.
  • deflector 24 and/or 26 may be adjustable to adjust a deflection angle ⁇ .
  • an inclination angle of at least a subgroup of plates 40, 42 may be adjustable.
  • FIG. 3 an exemplary tunnel thruster arrangement is depicted, in which two tunnel thrusters systems are positioned in a vessel such that each may constitute a flow obstacle for the other tunnel thruster system.
  • first hull segment 18 of first tunnel thruster system 10 is embodied as a fin.
  • second hull segment 18' of second tunnel thruster system 10 is also embodied as a fin. Both first and second hull segment 18, 18' form part of hull structure 12 of vessel 1.
  • both tunnel thruster systems 10, 10' generate a water jet in the same direction for steering vessel 1.
  • tunnel thruster systems 10, 10' may either both generate a water jet in a starboard side direction, or in a port side direction of vessel 1.
  • first propeller unit 22 may generate a water jet in a first direction (schematically indicated by dotted line 34).
  • the water jet flowing in that first direction would impinge on "downstream" second tunnel thruster system 10' if not being deflected by first deflector 26 in a second direction (schematically indicated by solid line 38).
  • second propeller unit 22' of second tunnel thruster system 10' if steering vessel 1 in the other direction, second propeller unit 22' of second tunnel thruster system 10' generates a water jet directed to "downstream" first tunnel thruster system 10.
  • second deflector 26' of second tunnel thruster system 10' deflects the water jet in a second direction (indicated by solid line 38') different from the direction before passing second deflector 26' (indicated by dotted line 34').
  • Impingement of the water j et on vessel 1 may negatively affect steering of vessel 1. Additionally, as shown in Fig. 3 , the water jet of one tunnel thruster system 10 or 10' may enter passage 20' or 20 of other tunnel thruster system 10' or 10, and, thereby, may negatively affect generation of a water jet therein. For example, an inflow velocity into the "downstream" tunnel thruster system may be increased, which may decrease efficiency of the "downstream" thruster tunnel thruster system. Changed inflow conditions may lead to cavitation resulting in noise, vibrations, erosion, and/or lowered efficiency.
  • FIG. 4 an exemplary tunnel thruster system with a deflector is shown without a hull segment.
  • deflector 26 includes a plurality of flat shaped deflector plates 42 arranged in parallel and extending in opening 30 of passage 20 in a horizontal direction. To enhance stability of deflector plates 42, struts 44 connecting deflector plates 42 to one another and to hull segment 18 are provided.
  • deflector 26 may also function as a protective grid in opening 30 of passage 20.
  • Said protective grid may protect tunnel thruster system 10 from entering of solid objects in the water, for example, icing, which may damage propeller unit 22.
  • the tunnel thruster system as generically disclosed herein is applicable in vessels for improving maneuverability of the vessel.
  • the herein disclosed tunnel thruster system is applicable in vessels including at least one flow obstacle for a water jet generated by the tunnel thruster system. That flow obstacle may result from a design of the vessel and may be, for example, a fin or another tunnel thruster system.
  • a deflector installed in a passage of a tunnel thruster system facilitates deflecting a water jet generated by a propeller unit of the tunnel thruster system. Due to the deflection, the water jet is redirected such that the same flows around a flow obstacle positioned in direction of the water jet before passing the deflector. Thus, impingement of the water jet on the flow obstacle is at least reduced, which results in a lowered counterforce on the desired steering force.
  • deflection angle ⁇ may be chosen to balance between losses due to impingement and losses due to deflection.
  • the individual losses due to deflection and impingement are adjustable to set a desired balance for a specific situation.
  • upward direction means in direction to a water surface
  • downward direction means in direction to a sea bed

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
EP14162417.1A 2014-03-28 2014-03-28 Bugstrahlrudersystem Withdrawn EP2923942A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14162417.1A EP2923942A1 (de) 2014-03-28 2014-03-28 Bugstrahlrudersystem
PCT/EP2015/000653 WO2015144311A1 (en) 2014-03-28 2015-03-26 Tunnel thruster system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14162417.1A EP2923942A1 (de) 2014-03-28 2014-03-28 Bugstrahlrudersystem

Publications (1)

Publication Number Publication Date
EP2923942A1 true EP2923942A1 (de) 2015-09-30

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ID=50389331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14162417.1A Withdrawn EP2923942A1 (de) 2014-03-28 2014-03-28 Bugstrahlrudersystem

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EP (1) EP2923942A1 (de)
WO (1) WO2015144311A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180244356A1 (en) * 2013-10-21 2018-08-30 Hsin Chi SU Expandable Floating Structure
WO2024037197A1 (zh) * 2022-08-16 2024-02-22 浙江唯海科技有限公司 一种推进器保护装置及螺旋桨推进器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3670316A1 (de) * 2018-12-17 2020-06-24 Elomatic Oy Gitter für ein tunnelstrahlruder
CN112009661A (zh) * 2020-08-27 2020-12-01 陕西科技大学 一种可灵活迅速转向船只

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008443A (en) * 1956-10-22 1961-11-14 Voith Gmbh J M Device for covering transverse passages in ships
JP2002264895A (ja) * 2001-03-13 2002-09-18 Ishikawajima Harima Heavy Ind Co Ltd 双胴船のサイドスラスタ
JP2004009951A (ja) * 2002-06-10 2004-01-15 Mitsubishi Heavy Ind Ltd スラスタ吐出水流角度調節グリッド
EP2305558A1 (de) 2009-09-30 2011-04-06 ZF Friedrichshafen AG Tunnelpropeller für Schiffe
KR20130000054A (ko) * 2011-06-22 2013-01-02 삼성중공업 주식회사 사이드 스러스터의 유동방향 조절장치
KR20140036409A (ko) * 2012-09-13 2014-03-26 삼성중공업 주식회사 사이드 스러스터를 구비한 선박

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008443A (en) * 1956-10-22 1961-11-14 Voith Gmbh J M Device for covering transverse passages in ships
JP2002264895A (ja) * 2001-03-13 2002-09-18 Ishikawajima Harima Heavy Ind Co Ltd 双胴船のサイドスラスタ
JP2004009951A (ja) * 2002-06-10 2004-01-15 Mitsubishi Heavy Ind Ltd スラスタ吐出水流角度調節グリッド
EP2305558A1 (de) 2009-09-30 2011-04-06 ZF Friedrichshafen AG Tunnelpropeller für Schiffe
KR20130000054A (ko) * 2011-06-22 2013-01-02 삼성중공업 주식회사 사이드 스러스터의 유동방향 조절장치
KR20140036409A (ko) * 2012-09-13 2014-03-26 삼성중공업 주식회사 사이드 스러스터를 구비한 선박

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180244356A1 (en) * 2013-10-21 2018-08-30 Hsin Chi SU Expandable Floating Structure
WO2024037197A1 (zh) * 2022-08-16 2024-02-22 浙江唯海科技有限公司 一种推进器保护装置及螺旋桨推进器

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Publication number Publication date
WO2015144311A1 (en) 2015-10-01

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