JPS5923675Y2 - bow hull shape - Google Patents
bow hull shapeInfo
- Publication number
- JPS5923675Y2 JPS5923675Y2 JP1980191196U JP19119680U JPS5923675Y2 JP S5923675 Y2 JPS5923675 Y2 JP S5923675Y2 JP 1980191196 U JP1980191196 U JP 1980191196U JP 19119680 U JP19119680 U JP 19119680U JP S5923675 Y2 JPS5923675 Y2 JP S5923675Y2
- Authority
- JP
- Japan
- Prior art keywords
- bow
- resistance
- wave
- ship
- cutout
- 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.)
- Expired
Links
Classifications
-
- 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
Description
【考案の詳細な説明】 本考案は船首船型に関するものである。[Detailed explanation of the idea] The present invention relates to a bow hull type.
船が航行する場合、船体は水による抵抗として粘性抵抗
と造波抵抗を受ける。When a ship sails, the hull experiences viscous resistance and wave resistance as resistance from water.
このうち粘性抵抗は摩擦抵抗と形状抵抗とからなり、水
の粘性に基づくものであり、レイノルズの相似則に従う
。Among these, viscous resistance consists of frictional resistance and shape resistance, is based on the viscosity of water, and follows Reynolds' law of similarity.
方、造波抵抗は自由表面の存在を基づくものであり、フ
ルードの相似則に従う。On the other hand, wave resistance is based on the existence of a free surface and follows Froude's law of similarity.
船体抵抗を減少させるためには、一般に低速船において
は粘性抵抗を、高速船においては造波抵抗を減少させる
ことに主眼がおかれる。In order to reduce hull resistance, the main focus is generally on reducing viscous resistance in low-speed ships and wave-making resistance in high-speed ships.
造波抵抗は波紋抵抗と砕波抵抗とからなる。Wave-making resistance consists of ripple resistance and wave-breaking resistance.
波紋抵抗は船の航走によって発生した波が進行波となっ
て船から離れ去り、エネルギーの一部が波のエネルギー
となって遠方に運び去られるためのものであり、砕波抵
抗は船首付近において発生した急峻な水面の隆起のため
に液滴れや渦が発生し、そのために水頭損失や渦エネル
ギーとしてエネルギーが運び去られるためのものである
。Ripple resistance is caused by waves generated by a ship sailing as traveling waves that move away from the ship, and some of the energy becomes wave energy and is carried away far away.Wave-breaking resistance occurs near the bow of the ship. Droplets and vortices are generated due to the steep rise of the water surface, which causes energy to be carried away as water head loss and vortex energy.
また一方、造波抵抗を圧力抵抗としてみると、船の航走
のために船首付近で水面の隆起にともなう上昇が発生し
、そのために抵抗が発生するものである。On the other hand, if we look at wave-making resistance as pressure resistance, a rise occurs near the bow of the ship as the water surface rises due to the ship's navigation, which causes resistance.
したがって造波抵抗を減少させるために、船首付近にお
ける水面の隆起を極力押える必要がある。Therefore, in order to reduce wave-making resistance, it is necessary to suppress the prominence of the water surface near the bow as much as possible.
第１図、第２図は従来の船首船型を示し、これによると
船首１に水面の隆起２が発生している。FIGS. 1 and 2 show a conventional bow hull shape, in which a water surface bulge 2 is generated at the bow 1. FIG.
本考案は、船首付近の水面の隆起を減少させて造波抵抗
を減少させ得、特に中高速船に有利な船首船型を提案す
るもので、以下その一実施例を第３図、第４図に基づい
て説明する。The present invention proposes a bow hull shape that can reduce wave-making resistance by reducing the prominence of the water surface near the bow, and is especially advantageous for medium- to high-speed ships.One example of this is shown in Figures 3 and 4 below. The explanation will be based on.
すなわち本考案では、船首１０の中心部に、満載吃水線
よりも上方位置がら船底部１１に亘って、自然角度をも
って傾斜し且つ下面開放の切り抜き部１２を形威し、そ
して切り抜き部１２の両側の船首部分を球頭状のバルブ
部１３ Ａ、 １３ Ｂとして、双頭形状にしている。That is, in the present invention, a cutout 12 is formed in the center of the bow 10, extending over the bottom 11 from a position above the full load waterline, and is inclined at a natural angle and has an open bottom surface. The bow portion of the vessel is made into a double-headed shape with spherical valve portions 13A and 13B.
前記切り抜き部１２の巾は、船体強度を失わない範囲内
に設定しである。The width of the cutout portion 12 is set within a range that does not reduce the strength of the hull.
第５図、第６図は実験を行った結果を示す。Figures 5 and 6 show the results of the experiment.
すなわち第５図は満載状態を、第６図はバラスト状態を
示す。That is, FIG. 5 shows the fully loaded state, and FIG. 6 shows the ballast state.
これらの図において本考案は点線で示され、従来例（第
１図、第２図）は実線で示されている。In these figures, the present invention is shown by a dotted line, and the conventional example (FIGS. 1 and 2) is shown by a solid line.
この実験結果によれば、本考案の場合は、第５図の満載
状態ではフルード数Ｆｎが０．１２〜０．１４より小さ
い時では従来例に比べて抵抗が増加し、０゜１２〜０．
１４より大きい時には抵抗が減少している。According to the experimental results, in the case of the present invention, in the fully loaded state shown in Fig. 5, when the Froude number Fn is smaller than 0.12 to 0.14, the resistance increases compared to the conventional example, ．．
When it is greater than 14, the resistance is decreasing.
また、第６図のバラスト状態では、フルード数が０．１
２〜０．１４より小さい時は従来例に比べ剰余抵抗係数
ｒＲはほは゛同じで、０．１２〜０．１４より大きい時
には剰余抵抗係数が減少している。In addition, in the ballast state shown in Figure 6, the Froude number is 0.1.
When it is smaller than 2 to 0.14, the residual resistance coefficient rR is almost the same as that of the conventional example, and when it is larger than 0.12 to 0.14, the residual resistance coefficient is decreased.
上記構成の本考案によると、船首の中心部に、満載時に
おける吃水線よりも上方位置がら船底部に亘って切り抜
き部を形威し、この切り抜き部の下面が完全に開放され
た構成としたことにより、船首付近の波は切り抜き部を
通して後方にスムーズに流すことができ、該船首付近の
水面の隆起を減少させて造波抵抗を減少させることがで
きる。According to the present invention having the above configuration, a cutout is formed in the center of the bow extending above the waterline when fully loaded and extends to the bottom of the ship, and the bottom surface of this cutout is completely open. As a result, waves near the bow of the boat can flow smoothly rearward through the cutout, and the prominence of the water surface near the bow of the boat can be reduced, thereby reducing wave-making resistance.
さらに、切り抜き部はウェーブガイドとなり、プロペラ
に良好なフローを与えるとともに、保針性（ｃｏｕｒｓ
ｅ ｋｅｅｐｉｎｇ）を向上させることにより、機関
燃費の節約が可能になる。Furthermore, the cutout part becomes a wave guide, giving the propeller a good flow and improving course keeping performance.
By improving engine fuel efficiency (e keeping), it is possible to save on engine fuel consumption.
フルード数Ｆｎが０゜１２〜０．１４より大きい時に剰
余抵抗係数ｒＲが減少することにより、本考案の船首船
型は特に中高速船の低燃費化に有利なものである。Since the residual drag coefficient rR decreases when the Froude number Fn is larger than 0.12 to 0.14, the bow hull shape of the present invention is particularly advantageous for reducing fuel consumption of medium- to high-speed ships.
また、満載状態では、フルード数Ｆｎが０．１２〜０．
１４より小さい時には従来例に比べて剰余抵抗係数ｒＲ
が増加することによって、停止距離が短くなるのみなら
ず、ターニングサークルを小さくできる効果がある。In addition, in a fully loaded state, the Froude number Fn is 0.12 to 0.
When it is smaller than 14, the residual resistance coefficient rR compared to the conventional example
By increasing , not only the stopping distance becomes shorter, but also the turning circle becomes smaller.
第１図、第２図は従来例を示し、第１図は側面図、第２
図は正面図、第３図、第４図は本考案の一実施例を示し
、第３図は側面図、第４図は正面図、第５図、第６図は
実験結果を示すグラフ図である。
１０・・・船首、１１・・・船底部、１２・・・切り抜
き部、１３Ａ。
１３Ｂ・・・バルブ部。Figures 1 and 2 show conventional examples, with Figure 1 being a side view and Figure 2 being a side view.
The figure is a front view, Figures 3 and 4 show an embodiment of the present invention, Figure 3 is a side view, Figure 4 is a front view, and Figures 5 and 6 are graphs showing experimental results. It is. 10... Bow, 11... Bottom, 12... Cutout, 13A. 13B...Valve part.
Claims (1)
に亘って、傾斜し且つ下面開放の切り抜き部を形成し、
この切り抜き部の両側の船首部分を球頭状のバルブ部に
形成したことを特徴とする船首船型。Forming a cutout in the center of the bow extending from a position above the full load waterline to the bottom of the ship, which is slanted and open at the bottom;
A bow ship shape characterized in that the bow portions on both sides of the cut-out portion are formed into spherical valve portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980191196U JPS5923675Y2 (en) | 1980-12-25 | 1980-12-25 | bow hull shape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980191196U JPS5923675Y2 (en) | 1980-12-25 | 1980-12-25 | bow hull shape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57109087U JPS57109087U (en) | 1982-07-06 |
| JPS5923675Y2 true JPS5923675Y2 (en) | 1984-07-13 |
Family
ID=29995639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980191196U Expired JPS5923675Y2 (en) | 1980-12-25 | 1980-12-25 | bow hull shape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5923675Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008528375A (en) * | 2005-02-01 | 2008-07-31 | ニュー ロジスティクス ゲーエムベーハー | bow |
-
1980
- 1980-12-25 JP JP1980191196U patent/JPS5923675Y2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008528375A (en) * | 2005-02-01 | 2008-07-31 | ニュー ロジスティクス ゲーエムベーハー | bow |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57109087U (en) | 1982-07-06 |
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