JP2000168673A - Frictional resistance reducing ship - Google Patents
Frictional resistance reducing shipInfo
- Publication number
- JP2000168673A JP2000168673A JP10346834A JP34683498A JP2000168673A JP 2000168673 A JP2000168673 A JP 2000168673A JP 10346834 A JP10346834 A JP 10346834A JP 34683498 A JP34683498 A JP 34683498A JP 2000168673 A JP2000168673 A JP 2000168673A
- Authority
- JP
- Japan
- Prior art keywords
- seawater
- cooling water
- hull
- ship
- microbubbles
- 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.)
- Pending
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
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、航行時に船体表面
に作用する摩擦抵抗を低減できるようにする摩擦抵抗低
減船に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship for reducing frictional resistance acting on a hull surface during navigation.
【０００２】[0002]
【従来の技術】船舶の航行時には、流体としての海水の
粘性のために船体の周りに海水による境界層が形成され
るが、この境界層の中では、海水の流速は船体表面が零
で船体表面から離れるに従い急激に大きく変化する傾向
にあり、船体の表面に海水の摩擦抵抗が作用し船体抵抗
の大きな要素の一つとなっている。2. Description of the Related Art During the navigation of a ship, a boundary layer of seawater is formed around the hull due to the viscosity of seawater as a fluid. In this boundary layer, the flow velocity of the seawater is zero and the hull surface is zero. It tends to change drastically as the distance from the surface increases, and seawater frictional resistance acts on the surface of the hull, which is one of the major factors of hull resistance.
【０００３】そのため、近年、上記船体の表面に作用す
る摩擦抵抗を減少させて推進性能を向上させるための研
究が進められており、その対策の一つとして、船体表面
から微小気泡（マイクロバブル）を噴出させ、船体の没
水部（浸水部）表面の境界層内に微小気泡を吹き込んで
船体の没水部表面を微小気泡で覆うことにより船体表面
に作用する摩擦抵抗を低減することを狙ったマイクロバ
ブル推進法の研究が進められている。[0003] Therefore, in recent years, studies have been made to improve the propulsion performance by reducing the frictional resistance acting on the surface of the hull, and as one of the measures, micro-bubbles (micro-bubbles) are generated from the hull surface. And blow the microbubbles into the boundary layer on the surface of the submerged part (submerged part) of the hull to cover the surface of the submerged part of the hull with the microbubbles, thereby reducing the frictional resistance acting on the hull surface. Research on the microbubble propulsion method is ongoing.
【０００４】マイクロバブル推進法を具現化するための
一つの方法として、コンプレッサー等の空気送給装置で
発生させた加圧空気を船底や船側の没水部から水中へ吹
き出させて微小気泡（マイクロバブル）を発生させ、船
体の没水部表面に微小気泡による所要のボイドを形成さ
せるようにすることが考えられており、図２にその一例
の概略を示す如く、船体１における船底の船長方向に沿
う複数個所（図では３個所）に、図示しない加圧空気送
給手段によって送られた加圧空気を水中へ吹き出すため
の空気吹き出し器２を組み付け、且つ、流線が船首から
船尾に向かう領域に位置する船側の船長方向に沿う複数
個所（図では３個所）に、上記船底の空気吹き出し器２
と同様な空気吹き出し器２を組み付け、各空気吹き出し
器２から加圧空気を水中に吹き出させることにより、微
小気泡３を発生させ、該微小気泡３を流線に沿って流す
ことで、船体１の没水部の表面を微小気泡３で全面的に
広く覆い、ボイドを形成させて摩擦抵抗の低減を図るよ
うにした摩擦抵抗低減船が提案されている。As one method for realizing the microbubble propulsion method, compressed air generated by an air supply device such as a compressor is blown out into the water from the submerged portion on the bottom of the ship or on the side of the ship to generate microbubbles. It is considered to generate bubbles (bubbles) to form required voids due to microbubbles on the surface of the submerged portion of the hull, and as shown in FIG. Are installed at a plurality of locations (three locations in the figure) along with the air blower 2 for blowing out the pressurized air sent by pressurized air supply means (not shown) into the water, and the streamline goes from the bow to the stern. The air blower 2 at the bottom of the ship is provided at a plurality of places (three places in the figure) along the length of the ship on the ship side located in the area.
And air bubbles are blown out of each air blower 2 into the water to generate microbubbles 3 and flow the microbubbles 3 along streamlines, so that the hull 1 There has been proposed a frictional resistance reducing ship in which the surface of the submerged portion is entirely and widely covered with microbubbles 3 to form a void to reduce the frictional resistance.
【０００５】ところで、一般に、船舶の機関等の冷却水
としては船体１外より取り入れた水、すなわち、海洋に
あっては海水が用いられており、このために、図２に示
す如く、船体１の船底等に、冷却水取入口としてのシー
チェスト４を設け、且つ該シーチェスト４に取水管５を
介して冷却水ポンプ６を接続して、該冷却水ポンプ６を
駆動することにより、シーチェスト４から吸い込んだ海
水７を、冷却水として図示しない機関等へ送給するよう
にしてある。By the way, in general, water taken from outside the hull 1 is used as cooling water for the engine of the ship, that is, seawater is used in the ocean. For this reason, as shown in FIG. A sea chest 4 as a cooling water inlet is provided at the bottom of the ship or the like, and a cooling water pump 6 is connected to the sea chest 4 via an intake pipe 5 to drive the cooling water pump 6, thereby forming a sea chest. The seawater 7 sucked from the chest 4 is supplied to a not-shown engine or the like as cooling water.
【０００６】[0006]
【発明が解決しようとする課題】ところが、上記提案さ
れている摩擦抵抗低減船では、船体１の船底及び船側の
船長方向の広い範囲に複数の空気吹き出し器２を配設し
て、微小気泡３により船体１を広く覆うようにしてある
ため、冷却水取入口としてのシーチェスト４も微小気泡
３によって覆われてしまう虞があり、この場合、微小気
泡３が海水７と共に冷却水ポンプ６に吸い込まれてしま
うので、該冷却水ポンプ６に破損を引き起こす虞が生じ
るという問題がある。However, in the proposed frictional resistance reducing ship, a plurality of air blowers 2 are arranged in a wide area in the bottom direction of the hull 1 and in the lengthwise direction of the ship, so that the microbubbles 3 are provided. , The sea chest 4 as the cooling water intake may be covered by the microbubbles 3. In this case, the microbubbles 3 are sucked into the cooling water pump 6 together with the seawater 7. Therefore, there is a problem that the cooling water pump 6 may be damaged.
【０００７】因に、艦艇の装備の一つとして、船底外板
の外側に気泡を発生させ、該気泡による層を形成させる
ことで、機関室からの放射音を遮断することができるよ
うにしたマスカー（Ｍａｓｋｅｒ）装置があり、艦艇で
は、該マスカー装置の作動時に、冷却水としての海水と
共に上記気泡が冷却水ポンプに吸い込まれることを防止
するための手段として、冷却水取入口を船体外板面より
１５０〜２００mm程度外側へ突出させて設けるようにす
ることで、上記気泡の層の外側位置における海水を吸い
込むことができるようにしてある。[0007] One of the equipments of the ship is to generate air bubbles outside the outer shell of the bottom of the ship and to form a layer by the air bubbles, thereby making it possible to cut off sound radiated from the engine room. There is a masker device, and in a ship, when the masker device is operated, a cooling water intake port is provided as a means for preventing the bubbles from being sucked into the cooling water pump together with seawater as cooling water. By being provided so as to protrude outward by about 150 to 200 mm from the surface, seawater at a position outside the bubble layer can be sucked.
【０００８】しかし、この船体外板面から突出する形式
の冷却水取入口は、航走時の摩擦抵抗を増加させる要因
となるため、最大速力が３０ノットを超えるような強大
な軸馬力を有する艦艇ではほとんど問題にはならない
が、上記したマイクロバブル推進法を採用した商船の如
き船舶では、摩擦抵抗低減効果が小さくなってしまうと
いう問題がある。However, the cooling water intake projecting from the hull outer plate surface has a large shaft horsepower such that the maximum speed exceeds 30 knots because it causes an increase in frictional resistance during cruising. This is not a problem for ships, but for ships such as merchant ships employing the microbubble propulsion method, there is a problem that the effect of reducing frictional resistance is reduced.
【０００９】そこで、本発明は、航走時の摩擦抵抗を増
加させることなしに、冷却水ポンプへの微小気泡の吸い
込みを防止することができるようにしようとするもので
ある。Accordingly, an object of the present invention is to prevent suction of microbubbles into a cooling water pump without increasing frictional resistance during traveling.
【００１０】[0010]
【課題を解決するための手段】本発明は、上記課題を解
決するために、船体の船長方向前半部の所要個所に、加
圧空気を水中へ吹き出させることにより微小気泡を発生
させるようにしてある空気吹き出し器を設け、且つ上記
船体の船長方向後部の所要個所に、冷却水ポンプに取水
管を介して接続してある冷却水取入口を設けて、空気吹
き出し器と冷却水取入口とを船長方向の前後に大きく離
隔させて配置した構成とする。According to the present invention, in order to solve the above-mentioned problems, fine air bubbles are generated by blowing pressurized air into water at a required portion of a ship's hull in the first half in the longitudinal direction. A certain air blower is provided, and a cooling water inlet connected to a cooling water pump via a water intake pipe is provided at a required portion of the hull in the lengthwise direction of the hull, so that the air blower and the cooling water inlet are connected. It is configured to be widely separated before and after in the direction of the master.
【００１１】冷却水取入口が空気吹き出し器に対し遠く
離れた位置にあることから、冷却水取入口が微小気泡で
覆われる影響を少なくすることができる。[0011] Since the cooling water inlet is located far away from the air blower, the influence of the cooling water inlet being covered with microbubbles can be reduced.
【００１２】又、冷却水取入口の船長方向前部位置に設
けた海水噴射部と、船側上部の没水部に設けた海水取入
口と、該海水取入口と上記海水噴射部とを連結し且つ中
間部に海水ポンプを設けた導水管とからなる海水噴射装
置を装備させ、上記海水噴射部より海水を斜め後方へ噴
出させて、上記冷却水取入口に向かう微小気泡の流れを
阻止できるようにした構成とした場合は、海水噴射装置
の海水ポンプを駆動して、海水取入口から導水管を通し
て導いた海水を海水噴射部より噴出させると、冷却水取
入口に向かう微小気泡は上記海水の噴出流によって船体
の外方へと吹き飛ばされるため、冷却水取入口に微小気
泡が達することを防止することができて、冷却水取入口
からの微小気泡の吸い込みを防止することができる。Also, a seawater injection portion provided at a position in front of the cooling water inlet in the lengthwise direction of the ship, a seawater inlet provided at a submerged portion on the upper side of the ship, and the seawater inlet and the seawater injection portion are connected. In addition, a seawater injection device including a seawater pump provided with a seawater pump at an intermediate portion is provided, and seawater is jetted obliquely rearward from the seawater injection portion so that the flow of microbubbles toward the cooling water intake can be prevented. When the seawater pump of the seawater injection device is driven and the seawater guided through the water pipe from the seawater inlet is jetted from the seawater injection unit, the minute air bubbles heading to the cooling water inlet become the seawater. Since the jet flow blows out the hull, the microbubbles can be prevented from reaching the cooling water intake, and the suction of the microbubbles from the cooling water intake can be prevented.
【００１３】更に、冷却水取入口を船体後部の船側に設
けるようにした構成とすることにより、船底に比して微
小気泡の量が少ない船側に冷却水取入口が配置されるた
め、冷却水取入口からの微小気泡の吸い込みの防止をよ
り確実なものとすることができる。Further, by providing the cooling water intake port on the ship side at the rear of the hull, the cooling water intake port is arranged on the ship side where the amount of microbubbles is smaller than the bottom of the ship. Prevention of suction of microbubbles from the intake can be further ensured.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１５】図１（イ）（ロ）（ハ）は本発明の摩擦抵
抗低減船の実施の一形態を示すもので、船体１の船長方
向前半部のみとなる所要個所として、たとえば、船首部
１ａにおける船底の前後２個所及び船側の１個所に、図
２に示したものと同様な構成としてある空気吹き出し器
２を組み付け、且つ船体１の船長方向後部の所要個所と
して、たとえば、上記各空気吹き出し器２のいずれから
も遠く離れた船体１後部の船側に、一端を冷却水ポンプ
６に接続した取水管５の他端を船内側より接続した冷却
水取入口としてのシーチェスト４を設け、更に、船体１
の外方へ向けて海水７ａを噴出させて上記シーチェスト
４に向かう微小気泡３を吹き飛ばすための海水噴射装置
８を設ける。FIGS. 1 (a), 1 (b) and 1 (c) show an embodiment of a frictional resistance reducing ship according to the present invention. 1a, air blowers 2 having the same structure as that shown in FIG. 2 are attached to two places before and after the bottom of the ship and one place on the ship side. A sea chest 4 as a cooling water intake port is provided on the ship side at the rear of the hull 1 far from any of the blowers 2, with one end connected to a cooling water pump 6 and the other end connected to the inside of the ship, In addition, hull 1
A seawater spraying device 8 is provided for blowing out the seawater 7a to the outside and blowing off the microbubbles 3 toward the sea chest 4.
【００１６】上記海水噴射装置８はシーチェスト４の直
前部位置となる流線方向の上流側近傍位置に設けた海水
噴射部としての海水噴射スリット９と、微小気泡３によ
って覆われることの少ない船側上部の没水部に設けた海
水取入口１０と、該海水取入口１０と上記海水噴射スリ
ット９とを連通接続し、且つ中間位置に海水ポンプ１１
を設けた導水管１２とからなる構成として、海水取入口
１０より取り入れた海水７ａを、海水ポンプ１１で加圧
した後、海水噴射スリット９から流線方向下流側に位置
するシーチェスト４の外方へ向けて斜め後方へ噴射する
ことができるようにしてある。７は冷却水として用いる
海水を示す。The seawater jetting device 8 includes a seawater jetting slit 9 as a seawater jetting portion provided at a position immediately upstream of the sea chest 4 near the upstream in the streamline direction, and a ship side that is less covered by the microbubbles 3. A seawater inlet 10 provided in an upper submerged portion, and the seawater inlet 10 and the seawater injection slit 9 are connected to communicate with each other, and a seawater pump 11 is provided at an intermediate position.
After the seawater 7a taken in from the seawater inlet 10 is pressurized by the seawater pump 11, the outer surface of the sea chest 4 located on the streamline direction downstream side from the seawater injection slit 9 is configured as a structure including the water guide pipe 12 provided with It is designed to be able to inject obliquely backward toward the direction. Reference numeral 7 denotes seawater used as cooling water.
【００１７】船舶の航行時に、各空気吹き出し器２より
加圧空気を水中に吹き出させて微小気泡３を発生させる
ようにすると、該微小気泡３は流線に沿って流され、船
体１の船首部１ａの没水部の表面が微小気泡３によって
広く覆われるようになるため、航行時に最も大きな摩擦
抵抗が生じる船体１の船首部１ａに微小気泡３によるボ
イドを形成することができて、該ボイドの存在により船
体１の摩擦抵抗は効果的に低減されるようになる。At the time of navigation of the ship, when the compressed air is blown into the water from each air blower 2 to generate the microbubbles 3, the microbubbles 3 flow along the streamlines and the bow of the hull 1. Since the surface of the submerged portion of the portion 1a is widely covered by the microbubbles 3, voids due to the microbubbles 3 can be formed in the bow 1a of the hull 1 where the largest frictional resistance occurs during navigation. The presence of the void effectively reduces the frictional resistance of the hull 1.
【００１８】この際、海水噴射装置８の海水ポンプ１１
を駆動して海水取入口１０から取り入れた海水７ａを海
水噴射スリット９から噴射させるようにすると、流線に
沿って流されてシーチェスト４に向かうこととなる微小
気泡３は、図１（ニ）に二点鎖線で示す如く、シーチェ
スト４の流線方向上流側の近傍位置において、上記海水
噴射スリット９から噴射される海水７ａの流れによっ
て、シーチェスト４の外方へと吹き飛ばされる結果、微
小気泡３がシーチェスト４に達することが妨げられるよ
うになる。At this time, the seawater pump 11 of the seawater injection device 8
Is driven so that the seawater 7a taken in from the seawater inlet 10 is jetted from the seawater jet slit 9, the microbubbles 3 flowing along the stream lines and heading toward the sea chest 4 are shown in FIG. As shown by a two-dot chain line in FIG. 2), at a position near the streamline direction upstream of the sea chest 4, the sea water 7 a jetted from the sea water jet slit 9 blows the sea chest 4 outward. The microbubbles 3 are prevented from reaching the sea chest 4.
【００１９】上記において、空気吹き出し器２を船首部
１ａのみの配設とし、且つシーチェスト４を船体１の後
部に設けて、空気吹き出し器２から大きく離隔させた配
置となるようにし、更に、シーチェスト４を船底に比し
て微小気泡３の量が少ない船側に設けたことから、シー
チェスト４を微小気泡３により覆われ難くすることがで
き、更に、シーチェスト４の流線方向上流側位置におい
て海水噴射スリット９から噴射させた海水７ａにより、
流線に沿ってシーチェスト４に向かうこととなる微小気
泡３を外方へ吹き飛ばすことができるので、冷却水ポン
プ６に微小気泡３が海水７と共に吸い込まれることを防
ぐことができて、冷却水ポンプ６の破損事故を未然に防
止することができる。又、この場合、海水噴射スリット
９及び海水取入口１０はいずれも船体１外側へ突出させ
る必要がないので、航走時の摩擦抵抗を増加させること
はない。In the above, the air blower 2 is provided only at the bow 1a, and the sea chest 4 is provided at the rear of the hull 1 so that the air blower 2 is arranged far away from the air blower 2. Since the sea chest 4 is provided on the ship side where the amount of the microbubbles 3 is smaller than the ship bottom, the sea chest 4 can be made hard to be covered by the microbubbles 3, and furthermore, the sea chest 4 upstream in the streamline direction. By the seawater 7a jetted from the seawater jet slit 9 at the position,
Since the microbubbles 3 going to the sea chest 4 along the streamlines can be blown out, it is possible to prevent the microbubbles 3 from being sucked into the cooling water pump 6 together with the seawater 7, and The damage accident of the pump 6 can be prevented beforehand. Further, in this case, neither the seawater injection slit 9 nor the seawater intake 10 needs to protrude to the outside of the hull 1, so that the frictional resistance during traveling does not increase.
【００２０】なお、本発明は上記実施の形態のみに限定
されるものではなく、空気吹き出し器２は船首部１ａの
みの船底の２個所及び船側の１個所に配置し、且つシー
チェスト４は船体１後部の船側に設けたものとして示し
たが、シーチェスト４が微小気泡３によって覆われ難く
することができるよう空気吹き出し器２とシーチェスト
４とを船長方向の前後に充分離隔して配置することがで
きれば、シーチェスト４は船底に設けてもよく、又、こ
の場合、海水噴射装置８は省略することも可能であるこ
と、更に、空気吹き出し器２の配置個所、及び数は所望
する微小気泡３による船体被覆効果が得られるよう船体
１の前半部において自在に決定できること、更に又、海
水噴射部としては海水噴射スリット９を設けたものを示
したが、形状はスリットではなく円孔であってもよいこ
と、その他、本発明の要旨を逸脱しない範囲内において
種々変更を加え得ることは勿論である。The present invention is not limited to the above-described embodiment. The air blowers 2 are arranged only at the bow 1a at two places on the bottom of the ship and at one place on the ship side, and the sea chest 4 is provided on the hull. 1 Although shown as being provided on the ship side at the rear, the air blower 2 and the sea chest 4 are arranged at the front and rear of the ship so as to be separated from each other so as to make it difficult for the sea chest 4 to be covered by the microbubbles 3. If possible, the sea chest 4 may be provided at the bottom of the ship, and in this case, the seawater injection device 8 may be omitted, and the arrangement location and number of the air blowers 2 may be as small as desired. Although it can be freely determined in the first half of the hull 1 so that the hull covering effect by the air bubbles 3 can be obtained, and the seawater jetting section is provided with the seawater jetting slit 9, the shape is small. Tsu bets by may be a circular hole, not the other, it is obvious that various changes and modifications may be made without departing from the scope and spirit of the present invention.
【００２１】[0021]
【発明の効果】以上述べた如く、本発明の摩擦抵抗低減
船によれば、船体の船長方向前半部の所要個所に、加圧
空気を水中へ吹き出させることにより微小気泡を発生さ
せるようにしてある空気吹き出し器を設け、且つ上記船
体の船長方向後部の所要個所に、冷却水ポンプに取水管
を介して接続してある冷却水取入口を設けて、空気吹き
出し器と冷却水取入口とを船長方向の前後に大きく離隔
させて配置した構成としてあるので、冷却水取入口を微
小気泡で覆われにくくすることができ、したがって、冷
却水取入口を船体の外側へ突出させることがなくて摩擦
抵抗を増加させることがなく、又、冷却水取入口の船長
方向前部位置に設けた海水噴射部と、船側上部の没水部
に設けた海水取入口と、該海水取入口と上記海水噴射部
とを連結し且つ中間部に海水ポンプを設けた導水管とか
らなる海水噴射装置を装備させ、上記海水噴射部より海
水を斜め後方へ噴出させて、上記冷却水取入口に向かう
微小気泡の流れを阻止できるようにした構成を付加する
ことにより、流線に沿って冷却水取入口に向かうことと
なる微小気泡を、海水噴射装置の海水噴射部から噴出さ
せる海水によって船体の外方へ向けて吹き飛ばすことが
できることから、冷却水取入口に微小気泡が達して冷却
水ポンプに吸い込まれることを確実に防ぐことができ、
したがって、冷却水ポンプの破損を未然に防止すること
ができ、この際、海水噴射装置の海水噴射部及び海水取
入口は船体の外側へ突出させることなく設けることがで
きることから、航行時の摩擦抵抗を増加させることはな
く、更に、冷却水取入口を船体後部の船側に設けるよう
にした構成とすることにより、冷却水取入口が微小気泡
の量が少ない位置に配置されることから、冷却水取入口
からの微小気泡の吸い込みの防止をより確実なものとす
ることができる、という優れた効果を発揮する。As described above, according to the frictional resistance reducing ship of the present invention, the fine air bubbles are generated by blowing the pressurized air into the water at a required portion of the hull in the first half in the longitudinal direction. A certain air blower is provided, and a cooling water inlet connected to a cooling water pump via a water intake pipe is provided at a required portion of the hull in the lengthwise direction of the hull, so that the air blower and the cooling water inlet are connected. Since the cooling water intake is hardly covered with micro bubbles, the cooling water intake is hard to be covered with the minute air bubbles, so that the cooling water intake does not protrude to the outside of the hull. A seawater injection part provided at a position in front of the cooling water intake in the lengthwise direction of the cooling water intake, a seawater intake provided at a submerged part on the upper side of the ship, the seawater intake and the above seawater injection without increasing resistance. Connect with the part and inside A seawater injection device including a water pipe provided with a seawater pump is provided in the section, and seawater is jetted obliquely rearward from the seawater injection section so that the flow of microbubbles toward the cooling water inlet can be prevented. By adding the configuration, the microbubbles going to the cooling water intake along the streamline can be blown outward to the outside of the hull by the seawater ejected from the seawater injection unit of the seawater injection device, It is possible to reliably prevent micro bubbles from reaching the cooling water intake and being sucked into the cooling water pump,
Therefore, the breakage of the cooling water pump can be prevented beforehand. At this time, since the seawater injection portion and the seawater intake of the seawater injection device can be provided without projecting to the outside of the hull, the frictional resistance during navigation is reduced. In addition, the cooling water inlet is provided on the ship side at the rear of the hull, so that the cooling water inlet is disposed at a position where the amount of microbubbles is small, so that the cooling water intake is not increased. An excellent effect that the prevention of suction of microbubbles from the intake can be more reliably achieved is exhibited.
【図１】本発明の摩擦抵抗低減船の実施の一形態を示す
もので、（イ）は概略側面図、（ロ）は（イ）のＡ−Ａ
矢視拡大図、（ハ）はシーチェスト部分の拡大側面図、
（ニ）は（ハ）のＢ−Ｂ矢視図である。FIG. 1 shows an embodiment of a frictional resistance reducing ship according to the present invention, in which (a) is a schematic side view, and (b) is AA of (a).
Arrow view enlarged view, (C) is an enlarged side view of the sea chest part,
(D) is a view taken in the direction of arrows BB in (c).
【図２】これまでに提案されている摩擦抵抗低減船の一
例の概略を示す一部切断側面図である。FIG. 2 is a partially cut-away side view schematically showing an example of a ship that has been proposed to reduce frictional resistance.
１ 船体 ２ 空気吹き出し器 ３ 微小気泡 ４ シーチェスト（冷却水取入口） ５ 取水管 ６ 冷却水ポンプ ７ａ 海水 ８ 海水噴射装置 ９ 海水噴射スリット（海水噴射部） １０ 海水取入口 １１ 海水ポンプ １２ 導水管 DESCRIPTION OF SYMBOLS 1 Hull 2 Air blower 3 Microbubble 4 Sea chest (cooling water intake) 5 Water intake pipe 6 Cooling water pump 7a Seawater 8 Seawater injection device 9 Seawater injection slit (seawater injection part) 10 Seawater intake 11 Seawater pump 12 Water pipe
Claims (3)
圧空気を水中へ吹き出させることにより微小気泡を発生
させるようにしてある空気吹き出し器を設け、且つ上記
船体の船長方向後部の所要個所に、冷却水ポンプに取水
管を介して接続してある冷却水取入口を設けて、空気吹
き出し器と冷却水取入口とを船長方向の前後に大きく離
隔させて配置した構成を有することを特徴とする摩擦抵
抗低減船。An air blower is provided at a required portion of the hull in the forward half of the length of the hull so as to generate fine bubbles by blowing pressurized air into the water, and a required air blower is provided at a rear part of the hull in the length of the length. A cooling water pump connected to the cooling water pump via a water intake pipe at each location, and having a configuration in which the air blower and the cooling water intake are largely separated from each other in the longitudinal direction of the ship. Characteristic low friction drag ship.
た海水噴射部と、船側上部の没水部に設けた海水取入口
と、該海水取入口と上記海水噴射部とを連結し且つ中間
部に海水ポンプを設けた導水管とからなる海水噴射装置
を装備させ、上記海水噴射部より海水を斜め後方へ噴出
させて、上記冷却水取入口に向かう微小気泡の流れを阻
止できるようにした請求項１記載の摩擦抵抗低減船。2. A seawater injection portion provided at a position in front of the cooling water intake port in the lengthwise direction of the cooling water, a seawater intake port provided at a submerged portion above the ship, and the seawater intake port and the seawater injection portion are connected. In addition, a seawater injection device including a seawater pump provided with a seawater pump at an intermediate portion is provided, and seawater is jetted obliquely rearward from the seawater injection portion so that the flow of microbubbles toward the cooling water intake can be prevented. The frictional resistance reducing ship according to claim 1, wherein:
ようにした請求項１又は２記載の摩擦抵抗低減船。3. The frictional resistance reducing ship according to claim 1, wherein the cooling water intake is provided on a ship side at a rear part of the hull.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10346834A JP2000168673A (en) | 1998-12-07 | 1998-12-07 | Frictional resistance reducing ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10346834A JP2000168673A (en) | 1998-12-07 | 1998-12-07 | Frictional resistance reducing ship |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000168673A true JP2000168673A (en) | 2000-06-20 |
Family
ID=18386132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10346834A Pending JP2000168673A (en) | 1998-12-07 | 1998-12-07 | Frictional resistance reducing ship |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000168673A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101149505B1 (en) | 2009-10-27 | 2012-05-25 | 삼성중공업 주식회사 | Device for reducing propeller excitation force |
| WO2013002182A1 (en) * | 2011-06-28 | 2013-01-03 | 三菱重工業株式会社 | Air lubrication system of ship, ship having reduced frictional resistance and manufacturing method therefor |
| JP2013018344A (en) * | 2011-07-11 | 2013-01-31 | Mitsubishi Heavy Ind Ltd | Frictional resistance reduction type ship |
| CN101306716B (en) * | 2007-05-18 | 2013-08-07 | 孟英志 | Process and device for changing resistance force of moving objects in water |
| KR101487416B1 (en) | 2013-01-31 | 2015-01-29 | 삼성중공업 주식회사 | Propulsion reinforced ship |
| CN106005241A (en) * | 2008-04-01 | 2016-10-12 | 国立研究开发法人海上·港湾·航空技术研究所 | Frictional resistance reduction device for ship |
| KR101741831B1 (en) * | 2015-09-03 | 2017-05-30 | 삼성중공업 주식회사 | Vessel |
-
1998
- 1998-12-07 JP JP10346834A patent/JP2000168673A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306716B (en) * | 2007-05-18 | 2013-08-07 | 孟英志 | Process and device for changing resistance force of moving objects in water |
| CN106005241A (en) * | 2008-04-01 | 2016-10-12 | 国立研究开发法人海上·港湾·航空技术研究所 | Frictional resistance reduction device for ship |
| KR101149505B1 (en) | 2009-10-27 | 2012-05-25 | 삼성중공업 주식회사 | Device for reducing propeller excitation force |
| WO2013002182A1 (en) * | 2011-06-28 | 2013-01-03 | 三菱重工業株式会社 | Air lubrication system of ship, ship having reduced frictional resistance and manufacturing method therefor |
| JP2013010395A (en) * | 2011-06-28 | 2013-01-17 | Mitsubishi Heavy Ind Ltd | Ship with reduced frictional resistance, and manufacturing method thereof |
| JP2013018344A (en) * | 2011-07-11 | 2013-01-31 | Mitsubishi Heavy Ind Ltd | Frictional resistance reduction type ship |
| KR101487416B1 (en) | 2013-01-31 | 2015-01-29 | 삼성중공업 주식회사 | Propulsion reinforced ship |
| KR101741831B1 (en) * | 2015-09-03 | 2017-05-30 | 삼성중공업 주식회사 | Vessel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20110263168A1 (en) | Gaseous fluid vessel propulsion system | |
| JP2000168673A (en) | Frictional resistance reducing ship | |
| JP2019142482A (en) | System for minimizing bow wave | |
| US20060217009A1 (en) | Ship with wave engulfing enhanced propulsors | |
| JP2012001115A (en) | Twin skeg ship | |
| US7789032B1 (en) | Boat thruster apparatus and method | |
| TW544427B (en) | Semi-submerged hydrofoil | |
| US7575490B1 (en) | Passive air induction system for boats | |
| JP2002274478A (en) | Frictional resistance reducing device of ship | |
| KR20160117654A (en) | Resistance reduction apparatus of vessel | |
| JPS6311039Y2 (en) | ||
| US3534699A (en) | Apparatus for reducing the resistance of a ship hull | |
| US20090130925A1 (en) | Marine propulsor with inlet fluid inducer | |
| JP2001106171A (en) | Frictional resistance reduced-ship and method of reducing frictional resistance of hull | |
| JP2001106173A (en) | Frictional resistance reduced-ship | |
| JP2010115971A (en) | Monohull water jet propulsive ship | |
| JPH11180380A (en) | Friction reduction ship and friction reducing method for hull | |
| JP2001239994A (en) | Underwater discharge device for exhaust gas in ship | |
| JP2000203485A (en) | Friction resistance reducing ship | |
| JP3692398B2 (en) | Ship resistance reduction ship | |
| JP2001233281A (en) | Exhaust gas blowout device for ship | |
| JP2000255477A (en) | Friction resistance reduced ship | |
| JP2001233282A (en) | Exhaust gas blowout device for ship | |
| JPH10100983A (en) | Frictional resistance reducer for ship | |
| JPH10167048A (en) | Surface effect ship |