JP2007223557A - Twin skeg vessel - Google Patents

Twin skeg vessel Download PDF

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Publication number
JP2007223557A
JP2007223557A JP2006049720A JP2006049720A JP2007223557A JP 2007223557 A JP2007223557 A JP 2007223557A JP 2006049720 A JP2006049720 A JP 2006049720A JP 2006049720 A JP2006049720 A JP 2006049720A JP 2007223557 A JP2007223557 A JP 2007223557A
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Prior art keywords
skeg
twin
ship
hull
skegs
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Akira Nishigaki
亮 西垣
Toshinobu Sakamoto
利伸 坂本
Nobuyuki Yamaga
伸幸 山鹿
Akira Ishikawa
暁 石川
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Priority to JP2006049720A priority Critical patent/JP2007223557A/en
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    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a twin skeg vessel reducing the resistance of a twin skeg a and enhancing propulsion performance at air navigation. <P>SOLUTION: In the twin skeg vessel provided with a pair of right and left twin skegs on the vessel bottom 2 of a stern, the twin skeg comprising the pair of right and left skegs 3 is provided with a bent part 5 bent so as to enlarge a lower end side outward in a hull width direction near the axis of a propeller. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、船尾の船底に設けた左右一対のスケグ部にプロペラ軸を支持させたツイン・スケグ船に関するものである。   The present invention relates to a twin skeg ship in which a propeller shaft is supported by a pair of left and right skeg parts provided on the bottom of a stern.

従来より、左右一対のプロペラ軸を船体と一体のスケグ部で支持させて、左右のスケグ間にトンネル状船底凹部を形成したツイン・スケグ船が知られている。
このようなツイン・スケグ船は、たとえば航行する海域の水深等によりプロペラ径が制限されるような場合に適用すると、大きな推進力の確保が可能になる。従って、たとえばＬＮＧ船、フェリー及び客船等のような船舶に採用されている。また、従来のツイン・スケグは、左右一対のスケグが、船底から垂下されて互いに平行な中心軸線に沿って各々形成されている。（たとえば、特許文献１参照）
特開平８−１３３１７２号公報 2. Description of the Related Art Conventionally, a twin-skeg ship is known in which a pair of left and right propeller shafts are supported by a skeg portion integrated with a hull, and a tunnel-shaped bottom bottom recess is formed between the left and right skegs.
When such a twin-skeg ship is applied to a case where the propeller diameter is limited by, for example, the water depth of the sea area to be navigated, a large propulsive force can be secured. Therefore, it is employed in ships such as LNG ships, ferries and passenger ships. Further, in the conventional twin skeg, a pair of left and right skegs are respectively formed along the central axes that are suspended from the ship bottom and are parallel to each other. (For example, see Patent Document 1)
JP-A-8-133172

しかしながら、さらなる省エネ運航のため、航行時の推進性能のさらなる向上が望まれている。そのためには、ツイン・スケグ部の抵抗がさらに小さくなるように、形状を工夫する必要がある。
本発明は、上記の事情に鑑みてなされたものであり、その目的とするところは、ツイン・スケグ部の抵抗を低減することにより、航行時の推進性能が向上するツイン・スケグ船を提供することにある。 However, for further energy saving operation, further improvement in propulsion performance during navigation is desired. For that purpose, it is necessary to devise the shape so that the resistance of the twin skeg portion is further reduced.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a twin-skeg ship in which the propulsion performance at the time of navigation is improved by reducing the resistance of the twin-skeg part. There is.

本発明は、上記の課題を解決するため、下記の手段を採用した。
本発明の請求項１は、船尾の船底に左右一対のツイン・スケグを備えているツイン・スケグ船において、前記ツイン・スケグが、プロペラの軸中心位置付近で下端部側を船体幅方向外側に広げるように折曲した折曲部を備えていることを特徴とするものである。 In order to solve the above problems, the present invention employs the following means.
Claim 1 of the present invention is a twin-skeg ship provided with a pair of left and right twin skegs on the stern bottom of the stern. It is characterized by having a bent portion that is bent so as to be spread.

この発明によれば、ツイン・スケグが、プロペラの中心軸位置付近より下端部側を船体幅方向外側に広げるように折曲した屈曲部を備えることにより、スケグ付根やプロペラ軸位置を変えずに、ハの字の効果、すなわち、船尾上昇流を受けてスケグ内側面の圧力が増加し、これが推進方向の力として寄与する効果を得ることができる。この場合、ツイン・スケグの折曲部より上方は、略ハの字状に傾斜していてもよいし、略鉛直に垂下されていてもよい。   According to the present invention, the twin skeg is provided with a bent portion that is bent so that the lower end side is expanded outward in the hull width direction from the vicinity of the central axis position of the propeller, so that the skeg root and the propeller shaft position are not changed. The effect of the letter C, that is, the pressure on the inner surface of the skeg increases in response to the stern rising flow, and this contributes to the force in the propulsion direction. In this case, the upper part from the bent part of the twin skeg may be inclined in a substantially square shape or may be suspended vertically.

上記の発明においては、前記ツイン・スケグ付根部分より船体幅方向外側となる船底にフィンを取り付けることが好ましく、これにより、スケグ付根部分近傍の流速を加速してキャビテーションの発生を防止することができる。   In the above invention, it is preferable to attach fins to the bottom of the hull in the hull width direction from the twin skeg root portion, thereby accelerating the flow velocity near the skeg root portion and preventing cavitation. .

上述した本発明によれば、船尾付近の上昇流をスケグ内側面で受け、スケグ内側面の圧力が増加することにより、船の推進方向の力として寄与するため、船舶の推進性能が向上する。
また、略ハの字状としたツイン・スケグにおいては、ツイン・スケグ外側の付根部分近傍に流速を加速するフィンを取り付けることにより、キャビテーションの発生を防止することができるので、キャビテーションに起因する振動等の問題を低減または抑制することができる。 According to the present invention described above, the upward flow near the stern is received by the inner side surface of the skeg, and the pressure on the inner side surface of the skeg is increased, thereby contributing as the force in the propulsion direction of the ship.
In addition, in twin skegs with a substantially C shape, cavitation can be prevented by attaching fins that accelerate the flow velocity near the root part outside the twin skegs, so vibration caused by cavitation Such problems can be reduced or suppressed.

以下、本発明に係るツイン・スケグ船の一実施形態を図面に基づいて説明する。
図３は、ツイン・スケグ船１０の船尾側を船体中央線に沿って見た長手方向の縦断面図であり、図中の符号１は船体、２は船底、３はスケグ、４はプロペラ（スクリュー）であり、舵は図示が省略されている。このツイン・スケグ船１０は、船体１の船尾側となる船底２から突出して設けられた左右一対のスケグ３を備えている。また、左右一対のスケグ３には、その後端部に各々独立したプロペラ４が取付けられている。 Hereinafter, an embodiment of a twin-skeg ship according to the present invention will be described with reference to the drawings.
FIG. 3 is a longitudinal sectional view in the longitudinal direction of the stern side of the twin skeg ship 10 as seen along the hull center line. In the figure, reference numeral 1 denotes the hull, 2 denotes the ship bottom, 3 denotes the skeg, 4 denotes the propeller ( The rudder is not shown. The twin skeg ship 10 includes a pair of left and right skegs 3 that protrude from a ship bottom 2 on the stern side of the hull 1. In addition, independent propellers 4 are attached to the rear ends of the pair of left and right skegs 3, respectively.

＜第１の実施形態＞
以下、本発明に係るツイン・スケグ船について、その第１の実施形態を図１に基づいて説明する。ここで、図１は、図３の船体１を幅方向に切断したＡ−Ａ断面、Ｂ−Ｂ断面及びＣ−Ｃ断面について各々対応する符号Ａ，Ｂ，Ｃを付し、実線で示す従来形状のスケグ３′とともに本発明の形状を想像線で示した縦断面図である。 <First Embodiment>
A first embodiment of a twin-skeg ship according to the present invention will be described below with reference to FIG. Here, FIG. 1 shows conventional AA, B, and C cross sections obtained by cutting the hull 1 in FIG. It is the longitudinal cross-sectional view which showed the shape of this invention with the imaginary line with the shape skeg 3 '.

図示のスケグ３は、船体１の幅方向を分割する船体中央線Ｃｓに沿って左右対称となるように、船尾側の船底２から下方へ突出させて互いに対向するよう左右一対設けられたツイン・スケグと呼ばれるタイプである。
この実施形態では、スケグ３の下端部側が、プロペラ４の軸中心位置付近で船体１の幅方向外側へ広げる方向に折曲した折曲部５を備えている。すなわち、スケグ中心線Ｃ１を船体幅方向外側へ角度θ１だけ折曲する折曲部５が、プロペラ４の回転軸と略一致する軸線上に位置して設けられており、この折曲部５で外側に折曲されたスケグ中心線Ｃ２に沿ってスケグ３も折曲されている。この場合、折曲部５より上方のスケグ３は、略ハの字状に傾斜したものでもよいし、あるいは、略鉛直に垂下されたものでもよい。 The illustrated skegs 3 are provided in a pair of left and right twins so as to project downward from the stern side bottom 2 and face each other so as to be symmetrical along the hull center line Cs dividing the width direction of the hull 1. It is a type called Skeg.
In this embodiment, the lower end portion side of the skeg 3 is provided with a bent portion 5 that is bent in the direction of spreading outward in the width direction of the hull 1 near the axial center position of the propeller 4. That is, a bent portion 5 that bends the skeg center line C1 outward in the hull width direction by an angle θ1 is provided on an axis substantially coincident with the rotation axis of the propeller 4. The skeg 3 is also bent along the skeg center line C2 bent outward. In this case, the skeg 3 above the bent portion 5 may be inclined substantially in a letter C shape, or may be suspended substantially vertically.

このような構成のツイン・スケグは、船体後方視において少なくとも折曲部５の下方が略ハの字状に形成されるので、船尾付近の上昇流をスケグ内側面で受け、スケグ内側面の圧力が増加する。左右の各スケグはそれぞれ後端ほど幅が狭くなって閉じる形状であるので、スケグ内側面の圧力増は、船の推進方向の力として寄与する。この結果、スケグ部の抵抗の減少により、航行時の推進性能が向上する。   In the twin skeg having such a configuration, at least the lower part of the bent portion 5 is formed in a substantially C shape when viewed from the rear of the hull, so that the upward flow near the stern is received by the skeg inner surface, Will increase. Since each of the left and right skegs has a shape that becomes narrower and closes toward the rear end, the pressure increase on the inner side surface of the skeg contributes as a force in the propulsion direction of the ship. As a result, the propulsion performance at the time of navigation is improved due to the decrease in resistance of the skeg portion.

図４は、上述した折曲部５を設けた実施形態（略鉛直に垂下されたスケグ３′を折曲）及び従来形状のスケグ３′について、船速と剰余抵抗係数との関係を示す実験結果のグラフである。
この実験結果によれば、実線で示した従来形状の剰余抵抗係数が、全ての船速において本実施形態より大きいことが分かる。すなわち、従来形状と比較して剰余抵抗係数が小さい本実施形態は、抵抗が小さいため航行時の推進性能が優れている。 FIG. 4 is an experiment showing the relationship between the ship speed and the surplus resistance coefficient in the embodiment in which the bent portion 5 described above is provided (the bent skeg 3 ′ suspended substantially vertically) and the conventional skeg 3 ′. It is a graph of a result.
According to this experimental result, it can be seen that the residual resistance coefficient of the conventional shape indicated by the solid line is larger than that of the present embodiment at all ship speeds. In other words, the present embodiment, which has a smaller residual resistance coefficient than the conventional shape, has excellent propulsive performance during navigation because of its low resistance.

＜第２の実施形態＞
続いて、本発明に係るツイン・スケグ船について、その第２の実施形態を図２に基づいて説明する。ここで、図２は、船体１を幅方向に切断した断面について、実線で示す従来形状のスケグ３′とともに本発明のスケグ形状を想像線で示した縦断面図である。なお、以下の説明では、上述した実施形態と同様の部分に同じ符号を付し、その詳細な説明は省略する。 <Second Embodiment>
Subsequently, a second embodiment of the twin-skeg ship according to the present invention will be described with reference to FIG. Here, FIG. 2 is a longitudinal sectional view showing the skeg shape of the present invention with an imaginary line along with a conventional skeg 3 'indicated by a solid line with respect to a cross section of the hull 1 cut in the width direction. In the following description, the same reference numerals are given to the same parts as those in the above-described embodiment, and the detailed description thereof is omitted.

この実施形態のツイン・スケグは、スケグ付根部分より船体幅方向外側となる船底２に対して、必要に応じて左右対称に長手方向へ延びる一対のフィン７を取り付けるものである。このフィン７は、先端が外向きで下方を向いたものが好ましく、これにより、スケグ付根部分近傍の流速を加速してキャビテーションの発生を防止することができる。
このようなフィン７は、上述した第１の実施形態との組合せによりスケグ付根部分近傍で発生するキャビテーションを防止でき、従って、キャビテーションに起因する振動等の問題を低減または抑制するという作用効果を得ることができる。 The twin skeg of this embodiment is configured to attach a pair of fins 7 extending in the longitudinal direction symmetrically to the left and right sides of the ship bottom 2 that is on the outer side in the hull width direction from the skeg root portion. The fin 7 preferably has a tip outward and facing downward, whereby the flow velocity in the vicinity of the skeg root portion can be accelerated to prevent cavitation.
Such a fin 7 can prevent cavitation occurring in the vicinity of the root portion of the skeg by combining with the above-described first embodiment, and thus has the effect of reducing or suppressing problems such as vibration caused by cavitation. be able to.

このように、本発明によれば、船体後方視を略ハの字状としてスケグ部における抵抗を低減することができるので、航行時の推進性能を向上させたツイン・スケグ船を提供することができる。
また、略ハの字状としたツイン・スケグにおいては、流速を加速するフィンの取付により、キャビテーションの発生を防止することができるので、キャビテーションに起因する振動等の問題を低減または抑制することができる。
なお、本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において適宜変更することができる。 Thus, according to the present invention, the resistance in the skeg portion can be reduced by making the rear view of the hull substantially V-shaped, so that it is possible to provide a twin skeg ship with improved propulsion performance during navigation. it can.
In addition, in twin skegs with a generally C shape, the generation of cavitation can be prevented by attaching fins that accelerate the flow velocity, so that problems such as vibration caused by cavitation can be reduced or suppressed. it can.
In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.

本発明によるツイン・スケグ船の第１の実施形態として、船体の幅方向断面形状を示す図である。It is a figure which shows the cross-sectional shape of the width direction of a hull as 1st Embodiment of the twin skeg ship by this invention. 本発明によるツイン・スケグ船の第２の実施形態として、船体の幅方向断面形状を示す図である。It is a figure which shows the cross-sectional shape of the width direction of a hull as 2nd Embodiment of the twin skeg ship by this invention. 本発明に係るツイン・スケグ船の船尾について、船体の長手方向断面形状を示す断面図である。It is sectional drawing which shows the longitudinal direction cross-sectional shape of a hull about the stern of the twin skeg ship which concerns on this invention. 本発明の効果を示す実験結果であり、従来形状及び第２の実施形態を比較して船速と剰余抵抗係数との関係が示されている。It is an experimental result which shows the effect of this invention, and the relationship between a boat speed and a remainder resistance coefficient is shown by comparing a conventional shape and 2nd Embodiment.

符号の説明Explanation of symbols

１ 船体
２ 船底
３ スケグ
５ 折曲部
７ フィン
１０ ツイン・スケグ船 DESCRIPTION OF SYMBOLS 1 Hull 2 Bottom of a ship 3 Skeg 5 Bending part 7 Fin 10 Twin skeg ship

Claims (2)

船尾の船底に左右一対のツイン・スケグを備えているツイン・スケグ船において、
前記ツイン・スケグが、プロペラの軸中心位置付近で下端部側を船体幅方向外側に広げるように折曲した折曲部を備えていることを特徴とするツイン・スケグ船。 In a twin skeg ship with a pair of left and right twin skegs on the stern bottom,
The twin skeg ship, wherein the twin skeg is provided with a bent portion that is bent so that the lower end side is spread outward in the hull width direction in the vicinity of the axial center position of the propeller. 前記ツイン・スケグ付根部分より船体幅方向外側となる船底にフィンを取り付けたことを特徴とする請求項１に記載のツイン・スケグ船。   The twin-skeg ship according to claim 1, wherein fins are attached to the bottom of the hull in the hull width direction from the twin-skeg root portion.
JP2006049720A 2006-02-27 2006-02-27 Twin skeg vessel Withdrawn JP2007223557A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010140357A1 (en) * 2009-06-06 2010-12-09 独立行政法人海上技術安全研究所 Biaxial stern catamaran ship
JP2010280341A (en) * 2009-06-06 2010-12-16 National Maritime Research Institute Method for designing ship and stern shape
JP2011168238A (en) * 2010-02-22 2011-09-01 National Maritime Research Institute Catamaran with double stern shafts
JP2012056552A (en) * 2010-09-13 2012-03-22 Naoya Ogawa Reduction in oscillation of vessel by truncated chevron shaped stem catamaran type streamline shape and rudder arrangement
JP5276670B2 (en) * 2008-10-20 2013-08-28 三菱重工業株式会社 Twin Skeg ship
CN103538693A (en) * 2012-07-06 2014-01-29 现代重工业株式会社 Ship
CN104118529A (en) * 2014-07-29 2014-10-29 梁明森 Deadwood and ship
KR20180105224A (en) * 2016-03-31 2018-09-27 미츠비시 쥬고교 가부시키가이샤 Bottom line and twin sketch line of twin sketch line

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5276670B2 (en) * 2008-10-20 2013-08-28 三菱重工業株式会社 Twin Skeg ship
CN103991508A (en) * 2009-06-06 2014-08-20 独立行政法人海上技术安全研究所 Biaxial stern catamaran ship
JP2010280341A (en) * 2009-06-06 2010-12-16 National Maritime Research Institute Method for designing ship and stern shape
WO2010140357A1 (en) * 2009-06-06 2010-12-09 独立行政法人海上技術安全研究所 Biaxial stern catamaran ship
CN102458975A (en) * 2009-06-06 2012-05-16 独立行政法人海上技术安全研究所 Biaxial stern catamaran ship
KR101576717B1 (en) * 2009-06-06 2015-12-10 내셔널 매리타임 리서치 인스티튜트 Biaxial stern catamaran ship
JP2011168238A (en) * 2010-02-22 2011-09-01 National Maritime Research Institute Catamaran with double stern shafts
JP2012056552A (en) * 2010-09-13 2012-03-22 Naoya Ogawa Reduction in oscillation of vessel by truncated chevron shaped stem catamaran type streamline shape and rudder arrangement
CN103538693A (en) * 2012-07-06 2014-01-29 现代重工业株式会社 Ship
CN103538693B (en) * 2012-07-06 2016-05-11 现代重工业株式会社 Boats and ships
CN104118529A (en) * 2014-07-29 2014-10-29 梁明森 Deadwood and ship
KR20180105224A (en) * 2016-03-31 2018-09-27 미츠비시 쥬고교 가부시키가이샤 Bottom line and twin sketch line of twin sketch line
KR102124308B1 (en) 2016-03-31 2020-06-18 미츠비시 쥬고교 가부시키가이샤 Bottom structure of twin skeg line and twin skeg line

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