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JP4789484B2 - Bow valve and ship equipped with the same - Google Patents
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JP4789484B2 - Bow valve and ship equipped with the same - Google Patents

Bow valve and ship equipped with the same Download PDF

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JP4789484B2
JP4789484B2 JP2005049455A JP2005049455A JP4789484B2 JP 4789484 B2 JP4789484 B2 JP 4789484B2 JP 2005049455 A JP2005049455 A JP 2005049455A JP 2005049455 A JP2005049455 A JP 2005049455A JP 4789484 B2 JP4789484 B2 JP 4789484B2
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bow
valve
wave
bow valve
flat
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JP2006232086A (en
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聖始 増田
憲璽 高岸
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Universal Shipbuilding Corp
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Universal Shipbuilding Corp
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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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Description

この発明は船首バルブの構造及びその船首バルブを備えた船舶に関する。   The present invention relates to a structure of a bow valve and a ship provided with the bow valve.

従来より、船体に生じる造波抵抗を低減するための様々な船首バルブが提案されている（例えば、特許文献１及び特許文献２）。
特開平９−６６８８５号公報 特開平８−１３３１７１号公報 Conventionally, various bow valves for reducing wave resistance generated in the hull have been proposed (for example, Patent Document 1 and Patent Document 2).
JP-A-9-66885 JP-A-8-133171

船首バルブはそのバルブが生じる波と船体が生じる波を重ね合わせることで、船体全体が生じる波を小さくし、その結果、造波抵抗を小さくするものである。しかし、船体船首部の排水量とバルブのそれを比較すると、バルブの排水量は小さい。このため、船体が生じる波にバルブが作る波を重ね合わして波を小さくしようとする場合、バルブが作る波成分が小さいため効果的に船体船首部が作る波を小さくすることができなかった。これは排水量が大きければ大きいほど前進時に作る波が大きいためである。従って、従来のバルブでは、バルブ自体の排水量を大きくし、それにより船体船首部の波を小さくするしかなかった。しかし、バルブを大きくするには限界があり、船体重量や鋼材が多くかかるという問題もある。   The bow valve superimposes the wave generated by the valve and the wave generated by the hull, thereby reducing the wave generated by the entire hull and, as a result, reducing the wave-making resistance. However, comparing the amount of water discharged from the hull bow with that of the valve, the amount of water discharged from the valve is small. For this reason, when trying to reduce the wave by superimposing the wave generated by the valve on the wave generated by the hull, the wave component generated by the valve cannot be effectively reduced because the wave component generated by the valve is small. This is because the greater the amount of wastewater, the greater the waves generated during advancement. Therefore, in the conventional valve, the amount of drainage of the valve itself must be increased, thereby reducing the wave at the hull bow. However, there is a limit to enlarging the valve, and there is also a problem that it takes a lot of hull weight and steel materials.

本発明は上記課題に対応してなされたもので、船首バルブ自体の排水量を大きくすることなく、船首部における造波抵抗を低減できる船首バルブ及びその船首バルブを備えた船舶を提案するものである。   The present invention has been made in response to the above problems, and proposes a bow valve capable of reducing wave resistance at the bow portion without increasing the amount of drainage of the bow valve itself, and a ship equipped with the bow valve. .

本発明は、船舶に採用される船首バルブであって、先端面が平坦若しくは前方に膨れた形状の船首バルブの上端部を水平方向に扁平な扁平形状面とし、該扁平形状面が満載喫水線の下側近傍に位置するようにして、航行時に前記扁平形状面に正圧部を生じさせ、前記船首バルブが作る波と船体の船首部による波との相互干渉により、前記船首部での造波抵抗を低減するようにされており、前記扁平形状面が前記船首バルブの幅とほぼ等しい幅に形成されたものであり、フルード数が０．１５〜０．２２の船舶に適用するものである。
また、本発明の船舶は上記船首バルブを備えたものである。
The present invention is a bow valve adopted in a ship, and the upper end portion of the bow valve having a flat or bulging front end surface is formed into a flat shape surface that is flat in the horizontal direction, and the flat shape surface is a full load water line. It is located near the lower side, a positive pressure part is generated on the flat surface during navigation, and the wave formation at the bow part is caused by mutual interference between the wave produced by the bow valve and the wave caused by the bow part of the hull. The flat surface is formed to have a width substantially equal to the width of the bow valve, and is applied to a ship having a fluid number of 0.15 to 0.22. .
Moreover, the ship of this invention is equipped with the said bow valve.

以上の構成により、大きな正圧をより水面部に近い位置に配置させることができ、従来のバルブと同じ排水量でより大きな波成分を船首近傍で作ることができる。従って、波成分の重ね合わせにより十分に小さくすることができなかった船首部の波を小さくすることができ、船首部での造波抵抗が低減される。これにより船舶の推進性能が向上する。   With the above configuration, a large positive pressure can be arranged at a position closer to the water surface portion, and a larger wave component can be created near the bow with the same amount of drainage as that of a conventional valve. Therefore, it is possible to reduce the wave at the bow that could not be sufficiently reduced due to the superposition of the wave components, and to reduce the wave-making resistance at the bow. This improves the propulsion performance of the ship.

以下、本発明の船首バルブ及びそれを備えた船舶について説明する。
図１は本発明の実施形態に係る船首部を示す斜視図である。図１に示すように、船舶１はその船首バルブ２の上端部を水平方向に扁平な形状（水平方向にほぼ平行な平面形状）としている。この扁平形状面３は船舶の航行時にできるだけ水面に近い位置にあると造波抵抗の低減がより図れる。航行に際しては積荷が多いほど推進力を得るための馬力が必要となるため、扁平形状面３は満載喫水線の下側近傍（満載喫水線の下側で、満載喫水の約２０％以内）に位置しているのが好ましい。また、扁平形状面３の幅はできるだけ大きく取るのが好ましく、従って船首バルブの幅とほぼ等しい幅に形成されていることが好ましい。
さらに、船首バルブ２の突出長さも長い方が効果的なため、例えば船首バルブ２の先端を舳先に対応する位置まで突出させるのが好ましい。 Hereinafter, the bow valve of the present invention and a ship provided with the same will be described.
FIG. 1 is a perspective view showing a bow portion according to an embodiment of the present invention. As shown in FIG. 1, the ship 1 has an upper end portion of its bow valve 2 that is flat in the horizontal direction (a planar shape that is substantially parallel to the horizontal direction). If the flat surface 3 is located as close to the water surface as possible when navigating the ship, the wave resistance can be further reduced. When sailing, the more load there is, the more horsepower is required to obtain propulsive force. Therefore, the flat surface 3 is located near the lower side of the full load water line (below the full load water line and within about 20% of the full load water line). It is preferable. The width of the flat surface 3 is preferably as large as possible. Therefore, it is preferable that the flat surface 3 is formed to have a width substantially equal to the width of the bow valve.
Furthermore, since it is effective that the projection length of the bow valve 2 is long, for example, it is preferable to project the tip of the bow valve 2 to a position corresponding to the tip.

図２は本発明の船首バルブの作用説明図である。本発明では、船首バルブ２の上端部を水平方向に扁平な扁平形状面３とすることにより、船舶１の航行時にこの場所に高い正圧部を生じさせ、それにより船体前半部の作る波との相関により船首部での造波を抑えて、造波抵抗を低減させるものである。   FIG. 2 is an operation explanatory view of the bow valve of the present invention. In the present invention, the upper end portion of the bow valve 2 is formed into a flat shape surface 3 that is flat in the horizontal direction, so that a high positive pressure portion is generated at this location when the ship 1 is sailing, thereby generating waves generated by the front half of the hull. This suppresses the wave formation at the bow and reduces the wave formation resistance.

本発明では、特に、船首バルブ２の上端部にできるだけ幅広の扁平形状面３を設け、その扁平形状面３をできるだけ静水面に近づけることで、造波抵抗の低減をより大きくしようとしたものである。つまり、船首バルブの上端部を扁平形状とすることでそこに生じる正圧部を大きくし、さらに水面に対して平行かつより近傍に正圧部を配置することができ、これによりバルブ単独で作る波成分が大きくなり、船首部が作る波をより効果的に小さくすることが可能となっている。   In the present invention, in particular, the flattened surface 3 that is as wide as possible is provided at the upper end portion of the bow valve 2, and the flattened surface 3 is made as close to the hydrostatic surface as possible to further reduce the wave-making resistance. is there. In other words, by making the upper end portion of the bow valve flat, the positive pressure portion generated there can be enlarged, and further, the positive pressure portion can be arranged in parallel and closer to the water surface, thereby making the valve alone. The wave component is increased, and the wave created by the bow can be reduced more effectively.

図３は本発明の実施形態に係る船首バルブと従来の船首バルブにおける造波抵抗の相違を示す実験結果のグラフである。このグラフは縦軸が造波抵抗係数Ｃｗを、横軸フルード数Ｆｎを表している。なお、
Ｃｗ＝Ｒｗ／（１／２）ρＶ2Ｓ
Ｆｎ＝Ｖ／（ｇＬ）1/2
ただし、Ｒｗは造波抵抗、ｇは重力加速度、ρは水の密度、Ｌは船長、Ｖは船速、Ｓは船体の浸水表面積である。
図３から分かるように、本発明の実施形態に係る船首バルブでは、Ｆｎが０．１５〜０．２２の領域において造波抵抗の低減が確認され、従来の船首バルブに比べて最大で２５％の造波抵抗の低減が確認された。 FIG. 3 is a graph of experimental results showing the difference in wave resistance between a bow valve according to an embodiment of the present invention and a conventional bow valve. In this graph, the vertical axis represents the wave resistance coefficient Cw, and the horizontal axis represents the fluid number Fn. In addition,
Cw = Rw / (1/2) ρV 2 S
Fn = V / (gL) 1/2
Where Rw is the wave resistance, g is the acceleration of gravity, ρ is the density of water, L is the length of the ship, V is the speed of the ship, and S is the submerged surface area of the hull.
As can be seen from FIG. 3, in the bow valve according to the embodiment of the present invention, a reduction in wave resistance is confirmed in a region where Fn is 0.15 to 0.22, and the maximum is 25% compared to the conventional bow valve. Reduction of wave resistance was confirmed.

本発明の船首バルブは船の種類や形状にかかわらず目的の効果が得られるものであり、ＣＢが０．７０以上の中低速船においても適用できる。
ここで、ＣＢ＝▽／（Ｌｐｐ×Ｂ×ｄ）であり、
Ｌｐｐ＝最大喫水線と交わる船首先端位置から舵軸中心位置までの水平距離で測った船 舶の長さ、
Ｂ＝船舶の全幅、
ｄ＝船舶の最大喫水線下の深さ、
▽＝ｄに対応する型排水容積である。 The bow valve of the present invention can achieve the intended effect regardless of the type and shape of the ship, and can be applied to medium and low speed ships having a CB of 0.70 or more.
Here, CB = ▽ / (Lpp × B × d),
Lpp = the length of the ship as measured by the horizontal distance from the bow tip position intersecting the maximum waterline to the rudder axle center position,
B = full width of the ship,
d = depth below the maximum waterline of the ship,
The mold drainage volume corresponding to ▽ = d.

本発明の実施形態に係る船首部を示す斜視図。見た図で右が船体前半部、左が船体後半部の形状を示す）。The perspective view which shows the bow part which concerns on embodiment of this invention. The right side shows the shape of the first half of the hull, and the left shows the shape of the second half of the hull.) 本発明の船首バルブの作用説明図。Action | operation explanatory drawing of the bow valve of this invention. 本発明の実施形態に係る船首バルブと従来の船首バルブにおける造波抵抗の相違を示すグラフ。The graph which shows the difference of the wave-making resistance in the bow valve which concerns on embodiment of this invention, and the conventional bow valve.

符号の説明Explanation of symbols

１ 船舶、２ 船首バルブ、３ 扁平形状面。
1 ship, 2 bow valve, 3 flat surface.

Claims (2)

船舶に採用される船首バルブであって、先端面が平坦若しくは前方に膨れた形状の船首バルブの上端部を水平方向に扁平な扁平形状面とし、該扁平形状面が満載喫水線の下側近傍に位置するようにして、航行時に前記扁平形状面に正圧部を生じさせ、前記船首バルブが作る波と船体の船首部による波との相互干渉により、前記船首部での造波抵抗を低減するようにされており、
前記扁平形状面が前記船首バルブの幅とほぼ等しい幅に形成されたものであり、
フルード数が０．１５〜０．２２の船舶に適用するものであることを特徴とする船首バルブ。 It is a bow valve used in ships, and the upper end of the bow valve with a flat or bulging tip surface is a flat surface that is flat in the horizontal direction, and the flat surface is near the lower side of the full load water line. A positive pressure portion is generated on the flat shape surface during navigation, and the wave-making resistance at the bow portion is reduced by mutual interference between the wave produced by the bow valve and the wave caused by the bow portion of the hull. It is way,
The flat shape surface is formed to have a width substantially equal to the width of the bow valve,
A bow valve characterized by being applied to a ship having a fluid number of 0.15 to 0.22 . 請求項１記載の船首バルブを備えていることを特徴とする船舶。A ship comprising the bow valve according to claim 1.
JP2005049455A 2005-02-24 2005-02-24 Bow valve and ship equipped with the same Expired - Fee Related JP4789484B2 (en)

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JP6354082B2 (en) * 2015-01-13 2018-07-11 三菱造船株式会社 Ship

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JPS59195086U (en) * 1983-06-14 1984-12-25 三井造船株式会社 ship
JPS61166783A (en) * 1985-01-16 1986-07-28 Ishikawajima Harima Heavy Ind Co Ltd Bows structure
JPS61137088U (en) * 1985-02-15 1986-08-26
JPS61207286A (en) * 1985-03-12 1986-09-13 Osaka Sosenjo:Kk Spherical bow associated with shock-absorber for vessel
JPS6239390A (en) * 1985-08-15 1987-02-20 Mitsui Eng & Shipbuild Co Ltd Bow shape
JPH0514959Y2 (en) * 1987-03-19 1993-04-20
US4966286A (en) * 1989-06-26 1990-10-30 The Procter & Gamble Company Easy open flexible bag
JP2923536B2 (en) * 1990-11-01 1999-07-26 石川島播磨重工業株式会社 Hull shape
US5598802A (en) * 1994-04-21 1997-02-04 Ramde; Roar R. Hull configuration
JP3375743B2 (en) * 1994-08-02 2003-02-10 川崎重工業株式会社 Bow shape
JP4009643B2 (en) * 2004-04-28 2007-11-21 株式会社新来島どっく Ship bow shape

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