JP2014012443A - Frictional resistance reducing ship - Google Patents
Frictional resistance reducing ship Download PDFInfo
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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
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Abstract
Description
本発明は、水中に気体を吹き出すことにより船体の摩擦抵抗を低減する摩擦抵抗低減船に関し、特に、傾斜船底を有する摩擦抵抗低減船に関する。 The present invention relates to a frictional resistance reduction ship that reduces the frictional resistance of a hull by blowing gas into water, and more particularly to a frictional resistance reduction ship having an inclined bottom.
従来から、水中に気体を吹き出すことにより船体の摩擦抵抗を低減する摩擦抵抗低減船が種々提案されている（例えば、特許文献１及び特許文献２参照）。 Conventionally, various frictional resistance reduction ships that reduce the frictional resistance of the hull by blowing gas into water have been proposed (see, for example, Patent Document 1 and Patent Document 2).
例えば、特許文献１に記載された摩擦抵抗低減船は、船体の船幅方向に並んだ複数の空気噴出孔から構成された空気噴出孔群を有し、該空気噴出孔群は、船首側の船幅方向中央に形成された中央空気噴出孔群と、中央空気噴出孔群の船尾側に形成されるとともに船幅方向の両側方に形成された一対の側方空気噴出孔群と、を有している。 For example, the frictional resistance reduction ship described in Patent Document 1 has an air ejection hole group composed of a plurality of air ejection holes arranged in the ship width direction of the hull, and the air ejection hole group is provided on the bow side. A central air ejection hole group formed in the center of the ship width direction, and a pair of side air ejection hole groups formed on the stern side of the central air ejection hole group and on both sides in the width direction of the ship. doing.
また、特許文献２に記載された摩擦抵抗低減船は、船体の船底に設けられた空気吹き出し口から空気を水中に吹き出す空気吹き出し装置と、船底に設けられた空気回収口から空気を船体内に回収する空気回収装置と、を有し、空気回収装置は、空気吹き出し口より船尾側かつ空気回収口より船首側に配置される空気再吹き出し口から空気を水中に吹き出すように構成されている。 In addition, the frictional resistance reduction ship described in Patent Document 2 has an air blowing device that blows air into the water from an air blowing port provided on the bottom of the hull, and an air from the air recovery port provided on the bottom of the boat. The air recovery device is configured to blow air into water from an air re-outlet disposed on the stern side of the air outlet and on the bow side of the air recovery port.
ところで、フェリー等の比較的船速の速い船舶においては、船幅方向に船底の喫水が浅くなるように傾斜した傾斜船底（いわゆるライズオブフロア）を有することが多い。かかる傾斜船底を有する船舶では、船底から気体を吹き出した場合、水中に放出された気体は、船底の中心部から徐々に舷側に移動してしまうことから、気体が船底を覆う表面積が減少し、摩擦抵抗低減効果が低下してしまうこととなる。 By the way, a ship having a relatively fast boat speed such as a ferry often has an inclined ship bottom (so-called rise of floor) that is inclined so that the draft of the ship bottom becomes shallow in the width direction of the ship. In a ship having such an inclined ship bottom, when the gas is blown out from the ship bottom, the gas released into the water gradually moves from the center of the ship bottom to the shore side, so that the surface area of the gas covering the ship bottom decreases, A frictional resistance reduction effect will fall.
例えば、上述した特許文献１に記載された摩擦抵抗低減船では、船幅方向に複数の空気噴出孔群を有するものの、中央空気噴出孔群から吹き出された空気は左舷側及び右舷側に分岐して流れてしまい、中央空気噴出孔群の下流側における船体中心部を空気で覆うことはできないという問題があった。 For example, the frictional resistance reduction ship described in Patent Document 1 described above has a plurality of air ejection hole groups in the width direction, but the air blown out from the central air ejection hole group branches to the port side and starboard side. There was a problem that the hull center part on the downstream side of the central air ejection hole group could not be covered with air.
また、上述した特許文献２に記載された摩擦抵抗低減船では、船体中心線上に空気吹き出し口と空気再吹き出し口とを有するものの、空気再吹き出し口は同一の船体中心線上に配置された空気回収装置によって回収された空気を吹き出す部分であり、空気吹き出し口及び空気再吹き出し口から水中に吹き出された空気は船首から船尾に向かって真っ直ぐに流れることを前提としている。すなわち、特許文献２に記載された摩擦抵抗低減船において、傾斜船底を有する場合には、空気回収装置で吹き出された空気を回収することができず、空気再吹き出し口から空気を吹き出すことができなくなってしまうという問題があった。 Further, the frictional resistance reduction ship described in Patent Document 2 described above has an air outlet and an air re-outlet on the hull center line, but the air re-outlet is an air recovery unit arranged on the same hull center line. It is a part that blows out the air collected by the apparatus, and it is assumed that the air blown into the water from the air blowing port and the air re-blowing port flows straight from the bow toward the stern. That is, in the frictional resistance reduction ship described in Patent Document 2, when the ship has an inclined ship bottom, the air blown out by the air recovery device cannot be recovered and air can be blown out from the air re-outlet. There was a problem of disappearing.
本発明は、上述した問題点に鑑み創案されたものであり、傾斜船底を有する船舶であっても、水中に吹き出された気体が覆う表面積の減少を抑制することができ、摩擦抵抗低減効果を向上させることができる、摩擦抵抗低減船を提供することを目的とする。 The present invention has been devised in view of the above-described problems, and even a ship having an inclined ship bottom can suppress a reduction in surface area covered by gas blown into water, thereby reducing frictional resistance. An object is to provide a ship with reduced frictional resistance that can be improved.
本発明によれば、水中に気体を吹き出すことにより船体の摩擦抵抗を低減する摩擦抵抗低減船において、前記船体は、船幅方向に船底の喫水が浅くなるように傾斜した傾斜船底を有し、前記傾斜船底の船首側先端部における船体中心線上に配置され気体を吹き出す第一放出部と、該第一放出部よりも後方の前記傾斜船底に配置され気体を放出する補助放出部と、を有し、前記補助放出部は、前記第一放出部から吹き出された気体が前記傾斜船底に沿って舷側に傾斜して流れる気体流の死角となる位置に配置されている、ことを特徴とする摩擦抵抗低減船が提供される。 According to the present invention, in the frictional resistance reduction ship that reduces the frictional resistance of the hull by blowing gas into water, the hull has an inclined ship bottom that is inclined so that the draft of the ship bottom becomes shallow in the width direction of the ship. A first discharge part that is arranged on the hull center line at the tip of the bow of the inclined ship bottom and blows out gas; and an auxiliary discharge part that is arranged on the inclined ship bottom behind the first discharge part and discharges gas. The auxiliary discharge part is disposed at a position where the gas blown from the first discharge part becomes a blind spot of a gas flow that flows incline toward the shore side along the inclined ship bottom. A resistance reduction ship is provided.
前記補助放出部は、船体中心線上に配置される第一補助放出部と、舷側に配置される少なくとも一対の第二補助放出部と、を有し、前記第一放出部の中心点と前記第一補助放出部の舷側端点とを結ぶ第一直線と、該第一直線と同じ舷側における前記第一放出部の舷側端点と前記第二補助放出部の船体中心側端点とを結ぶ第二直線と、が平行となるように構成されていることが好ましい。 The auxiliary discharge portion includes a first auxiliary discharge portion disposed on the hull center line and at least a pair of second auxiliary discharge portions disposed on the shore side, and the center point of the first discharge portion and the first A first straight line connecting the anchor side end point of the one auxiliary discharge portion, and a second straight line connecting the anchor side end point of the first discharge portion on the same anchor side as the first straight line and the hull center side end point of the second auxiliary discharge portion. It is preferable that it is comprised so that it may become parallel.
さらに、前記第一放出部から吹き出される気体の流量は、前記第一放出部により形成される前記気体流が前記第一直線及び前記第二直線により挟まれた領域に含まれるように制御されていてもよい。 Further, the flow rate of the gas blown from the first discharge part is controlled so that the gas flow formed by the first discharge part is included in a region sandwiched between the first straight line and the second straight line. May be.
また、前記第一補助放出部は、船体中心線上に複数配置されており、各第一補助放出部は、上流側の第一補助放出部の中心点と下流側の第一補助放出部の舷側端点とを結ぶ第三直線が前記第一直線と平行となるように構成されていてもよい。 In addition, a plurality of the first auxiliary discharge portions are arranged on the hull center line, and each first auxiliary discharge portion has a central point of the first auxiliary discharge portion on the upstream side and a shore side of the first auxiliary discharge portion on the downstream side. A third straight line connecting the end points may be configured to be parallel to the first straight line.
また、前記第二補助放出部は、船尾方向に向かって舷側に接近するように多段に配置されており、各第二補助放出部は、上流側の第二補助放出部の舷側端点と下流側の第二補助放出部の船体中心側端点とを結ぶ第四直線が前記第二直線と平行となるように構成されていてもよい。 In addition, the second auxiliary discharge portions are arranged in multiple stages so as to approach the shore side toward the stern direction, and each second auxiliary discharge portion includes a shore end point and a downstream side of the upstream second auxiliary discharge portion. The 4th straight line which connects the hull center side end point of this 2nd auxiliary discharge | release part may be comprised so that it may become parallel to said 2nd straight line.
上述した本発明に係る摩擦抵抗低減船によれば、傾斜船底を有する船舶において船底から気体を放出した場合に、左舷側及び右舷側に分岐した気体流の死角となる部分、すなわち、気体流によって船底が覆われない部分に、気体を新たに水中に吹き出し可能な補助放出部を配置したことにより、傾斜船底を有する船舶であっても、水中に吹き出された気体が覆う表面積の減少を抑制し、摩擦抵抗低減効果を向上させることができる。 According to the above-described frictional resistance reduction ship according to the present invention, when gas is released from the ship bottom in a ship having an inclined ship bottom, the portion that becomes the blind spot of the gas flow branched to the port side and starboard side, that is, by the gas flow By arranging an auxiliary discharge part that can blow out gas into the water in the part where the ship bottom is not covered, even if the ship has an inclined ship bottom, it suppresses the reduction of the surface area covered by the gas blown into the water. The frictional resistance reduction effect can be improved.
特に、上述した第一直線と第二直線とが平行となるように第一補助放出部及び第二補助放出部を配置することにより、効果的に気体流の死角を補うことができ、水中に吹き出された気体が覆う表面積の減少を抑制しやすくすることができる。 In particular, by arranging the first auxiliary discharge portion and the second auxiliary discharge portion so that the first straight line and the second straight line are parallel to each other, the blind spot of the gas flow can be effectively compensated for and blown into the water. It is possible to easily suppress a decrease in the surface area covered with the generated gas.
以下、本発明の実施形態について図１〜図４を用いて説明する。ここで、図１は、本発明の第一実施形態に係る摩擦抵抗低減船を示す図であり、（ａ）は底面図、（ｂ）は図１（ａ）におけるＢ−Ｂ断面図、である。図２は、図１（ａ）における船首側の部分拡大図である。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a figure which shows the frictional resistance reduction ship which concerns on 1st embodiment of this invention, (a) is a bottom view, (b) is BB sectional drawing in Fig.1 (a). is there. FIG. 2 is a partially enlarged view of the bow side in FIG.
本発明の第一実施形態に係る摩擦抵抗低減船１０は、図１及び図２に示したように、水中に気体を吹き出すことにより船体の摩擦抵抗を低減する摩擦抵抗低減船であって、船体は、船幅方向に船底の喫水が浅くなるように傾斜した傾斜船底１１を有し、傾斜船底１１の船首側先端部における船体中心線Ｍ上に配置され気体を吹き出す第一放出部１と、第一放出部１よりも後方の傾斜船底１１に配置され気体を放出する補助放出部２と、を有し、補助放出部２は、第一放出部１から吹き出された気体が傾斜船底１１に沿って舷側に傾斜して流れる気体流ＦＬ１，ＦＲ１の死角となる位置に配置されている。 A frictional resistance reduction ship 10 according to a first embodiment of the present invention is a frictional resistance reduction ship that reduces the frictional resistance of a hull by blowing gas into water as shown in FIGS. Has an inclined ship bottom 11 inclined so that the draft of the ship bottom becomes shallow in the ship width direction, and is disposed on the hull center line M at the bow-side tip of the inclined ship bottom 11 and blows out gas, An auxiliary discharge portion 2 that is disposed on the inclined ship bottom 11 behind the first discharge portion 1 and discharges gas, and the auxiliary discharge portion 2 is configured such that the gas blown from the first discharge portion 1 flows into the inclined ship bottom 11. It arrange | positions in the position used as the blind spot of the gas flows FL1 and FR1 which incline to the heel side along.
前記摩擦抵抗低減船１０は、例えば、フェリー等の比較的船速の速い船舶であって、船幅方向に船底の喫水が浅くなるように傾斜した傾斜船底１１（いわゆるライズオブフロア）を有している。傾斜船底１１は、図１（ａ）に示したように、ボトムタンジェンシーラインＢＬとボトムキールＢＫとによって囲まれた平面により構成されており、図１（ｂ）に示したように、この平面が角度θの傾斜をなしている。なお、ボトムタンジェンシーラインＢＬの形状は、船種、船型、排水量等の条件によって適宜変更されるものである。 The frictional resistance reduction ship 10 is a ship having a relatively high ship speed such as a ferry, for example, and has an inclined ship bottom 11 (so-called rise of floor) that is inclined so that the draft of the ship bottom becomes shallow in the ship width direction. ing. As shown in FIG. 1A, the inclined ship bottom 11 is constituted by a plane surrounded by the bottom tangency line BL and the bottom keel BK. As shown in FIG. Is inclined at an angle θ. Note that the shape of the bottom tangency line BL is appropriately changed according to the conditions such as the ship type, the hull form, and the amount of drainage.
前記第一放出部１は、図１（ａ）に示したように、船体中心線Ｍを跨ぐように船首側先端部に形成された開口部である。したがって、第一放出部１から水中に吹き出された気体は、傾斜船底１１に沿って左舷側及び右舷側に分岐し、二つの気体流ＦＬ１，ＦＲ１を形成することとなる。この気体流ＦＬ１，ＦＲ１は、傾斜船底１１に沿って徐々に左舷側及び右舷側に移動し、最終的に傾斜船底１１から側方に抜けてしまう。 The said 1st discharge | release part 1 is an opening part formed in the bow side front-end | tip part so that the hull centerline M might be straddled, as shown to Fig.1 (a). Therefore, the gas blown into the water from the first discharge section 1 branches to the port side and starboard side along the inclined ship bottom 11 to form two gas flows FL1 and FR1. The gas flows FL1 and FR1 gradually move to the port side and starboard side along the inclined ship bottom 11, and finally escape from the inclined ship bottom 11 to the side.
このように、第一放出部１から水中に吹き出された気体は船尾方向に向かって直進しないことから、傾斜船底１１には気体流ＦＬ１，ＦＲ１が形成されない死角が形成されてしまうとともに、気体流ＦＬ１，ＦＲ１が傾斜船底１１を覆う表面積が減少してしまうこととなる。そこで、本実施形態では、第一放出部１により形成される気体流ＦＬ１，ＦＲ１が流れない部分（すなわち、死角となる部分）に、補助放出部２を配置するようにしている。 Thus, since the gas blown into the water from the first discharge part 1 does not go straight in the stern direction, a dead angle where the gas flow FL1, FR1 is not formed is formed on the inclined ship bottom 11, and the gas flow The surface area that FL1 and FR1 cover the inclined ship bottom 11 will decrease. Therefore, in the present embodiment, the auxiliary discharge portion 2 is arranged in a portion where the gas flows FL1 and FR1 formed by the first discharge portion 1 do not flow (that is, a portion that becomes a blind spot).
前記補助放出部２は、例えば、図１及び図２に示したように、船体中心線Ｍ上に配置される第一補助放出部２１と、舷側に配置される少なくとも一対の第二補助放出部２２と、を有し、第一放出部１の中心点Ｐ０と第一補助放出部２１の舷側端点Ｐ２１とを結ぶ第一直線Ｌ１と、第一直線Ｌ１と同じ舷側における第一放出部１の舷側端点Ｐ１と第二補助放出部２２の船体中心側端点Ｐ２２とを結ぶ第二直線Ｌ２と、が平行となるように構成されている。 For example, as shown in FIGS. 1 and 2, the auxiliary discharge portion 2 includes a first auxiliary discharge portion 21 disposed on the hull center line M and at least a pair of second auxiliary discharge portions disposed on the shore side. 22, the first straight line L1 connecting the center point P0 of the first discharge part 1 and the heel side end point P21 of the first auxiliary discharge part 21, and the heel side end point of the first discharge part 1 on the same heel side as the first straight line L1 The second straight line L2 that connects P1 and the hull center side end point P22 of the second auxiliary discharge portion 22 is configured to be parallel.
第一補助放出部２１は、第一放出部１により形成される気体流ＦＬ１，ＦＲ１の中央部の隙間（死角）を埋めるための補助放出部２である。かかる第一補助放出部２１は、第一放出部１と同様に、傾斜船底１１の船体中心線Ｍを跨ぐように配置されていることから、第一補助放出部２１から水中に吹き出された気体は、傾斜船底１１に沿って左舷側及び右舷側に分岐し、二つの気体流ＦＬ２１，ＦＲ２１を形成することとなる。この第一補助放出部２１により形成される気体流ＦＬ２１，ＦＲ２１が、第一放出部１により形成される気体流ＦＬ１，ＦＲ１と平行となるように構成されている。 The first auxiliary discharge part 21 is the auxiliary discharge part 2 for filling the gap (dead angle) in the central part of the gas flows FL1 and FR1 formed by the first discharge part 1. Since the first auxiliary discharge part 21 is arranged so as to straddle the hull center line M of the inclined ship bottom 11 like the first discharge part 1, the gas blown into the water from the first auxiliary discharge part 21 Branches to the port side and starboard side along the inclined ship bottom 11 to form two gas flows FL21 and FR21. The gas flows FL21 and FR21 formed by the first auxiliary discharge portion 21 are configured to be parallel to the gas flows FL1 and FR1 formed by the first discharge portion 1.
また、上述した第一直線Ｌ１に沿って第一補助放出部２１の横幅の大きさを設定していることから、第一補助放出部２１が第一放出部１により形成される気体流ＦＬ１，ＦＲ１の流れに与える影響を最小限にすることができる。 Further, since the width of the first auxiliary discharge portion 21 is set along the first straight line L1, the first auxiliary discharge portion 21 is formed of the gas flow FL1, FR1 formed by the first discharge portion 1. The influence on the flow of the product can be minimized.
第二補助放出部２２は、第一放出部１により形成される気体流ＦＬ１，ＦＲ１の舷側の隙間（死角）を埋めるための補助放出部２である。かかる第二補助放出部２２は、左舷側と右舷側とにそれぞれ形成されていることから、左舷側の第二補助放出部２２により気体流ＦＬ２２が形成され、右舷側の第二補助放出部２２により気体流ＦＲ２２が形成される。この第二補助放出部２２により形成される気体流ＦＬ２２，ＦＲ２２が、第一放出部１により形成される気体流ＦＬ１，ＦＲ１と平行となるように構成されている。 The second auxiliary discharge part 22 is the auxiliary discharge part 2 for filling the gap (dead angle) on the heel side of the gas flows FL1 and FR1 formed by the first discharge part 1. Since the second auxiliary discharge portion 22 is formed on the port side and the starboard side, the gas flow FL22 is formed by the second auxiliary discharge portion 22 on the port side, and the second auxiliary discharge portion 22 on the starboard side. As a result, the gas flow FR22 is formed. The gas flows FL22 and FR22 formed by the second auxiliary discharge portion 22 are configured to be parallel to the gas flows FL1 and FR1 formed by the first discharge portion 1.
また、上述した第二直線Ｌ２に沿って第二補助放出部２２の位置を設定していることから、第二補助放出部２２が第一放出部１により形成される気体流ＦＬ１，ＦＲ１の流れに与える影響を最小限にすることができる。 Further, since the position of the second auxiliary discharge portion 22 is set along the second straight line L2 described above, the flow of the gas flows FL1 and FR1 formed by the first discharge portion 1 by the second auxiliary discharge portion 22. Can be minimized.
ここで、図３は、図１に示した摩擦抵抗低減船の側面図である。上述した第一放出部１及び補助放出部２（第一補助放出部２１、第二補助放出部２２）を有する摩擦抵抗低減船１０は、例えば、図３に示したように、第一放出部１及び補助放出部２に気体（例えば、空気）を供給するブロア１２と、ブロア１２により供給された気体を一時的に貯蔵するタンク１３と、少なくともブロア１２の吸気量を制御する制御部１４と、を有している。第一放出部１及び補助放出部２はそれぞれタンク１３と配管によって接続されている。 Here, FIG. 3 is a side view of the frictional resistance reduction ship shown in FIG. The frictional resistance reduction ship 10 having the first discharge part 1 and the auxiliary discharge part 2 (the first auxiliary discharge part 21 and the second auxiliary discharge part 22) described above is, for example, as shown in FIG. 1 and a blower 12 for supplying gas (for example, air) to the auxiliary discharge unit 2, a tank 13 for temporarily storing the gas supplied by the blower 12, and a control unit 14 for controlling at least the intake air amount of the blower 12; ,have. The 1st discharge | release part 1 and the auxiliary | assistant discharge | release part 2 are connected with the tank 13 and piping, respectively.
このように、ブロア１２と第一放出部１及び補助放出部２との間にバッファとなるタンク１３を配置することにより、第一放出部１及び補助放出部２に供給される気体の圧力を均一化することができる。また、図示しないが、第一放出部１、第一補助放出部２１及び第二補助放出部２２のそれぞれに流量調整弁を配置することにより、制御部１４からの指令に基づいて、吹き出される気体の流量を個別に制御することもできる。 In this way, by arranging the tank 13 serving as a buffer between the blower 12 and the first discharge part 1 and the auxiliary discharge part 2, the pressure of the gas supplied to the first discharge part 1 and the auxiliary discharge part 2 can be reduced. It can be made uniform. Moreover, although not shown in figure, it arrange | positions based on the command from the control part 14 by arrange | positioning a flow regulating valve in each of the 1st discharge | release part 1, the 1st auxiliary | assistant discharge | release part 21, and the 2nd auxiliary | assistant discharge | release part 22. The gas flow rate can also be individually controlled.
また、第一放出部１及び補助放出部２（第一補助放出部２１、第二補助放出部２２）は、例えば、傾斜船底１１に形成された凹部に気体を供給する単一又は複数の配管が接続された構成であってもよいし、傾斜船底１１に埋め込まれるとともに水中面側に多孔板が配置されたエアチャンバに気体を供給する配管が接続された構成であってもよいし、それ以外の構成であってもよい。 Moreover, the 1st discharge | release part 1 and the auxiliary | assistant discharge | release part 2 (the 1st auxiliary | assistant discharge | release part 21, the 2nd auxiliary | assistant discharge | release part 22) are single or several piping which supplies gas to the recessed part formed in the inclined ship bottom 11, for example May be configured, or a configuration may be employed in which piping for supplying gas to an air chamber embedded in the inclined ship bottom 11 and having a perforated plate disposed on the underwater surface side is connected. Other configurations may be used.
上述した本実施形態に係る摩擦抵抗低減船１０によれば、傾斜船底１１を有する船舶において第一放出部１から気体を放出した場合に、左舷側及び右舷側に分岐した気体流ＦＬ１，ＦＲ１の死角となる部分、すなわち、気体流によって船底が覆われない部分に、気体を新たに水中に吹き出し可能な補助放出部２を配置したことにより、傾斜船底１１を有する船舶であっても、水中に吹き出された気体が覆う表面積の減少を抑制することができ、摩擦抵抗低減効果を向上させることができる。 According to the frictional resistance reduction ship 10 according to the above-described embodiment, when gas is released from the first discharge part 1 in a ship having the inclined ship bottom 11, the gas flows FL1 and FR1 branched to the port side and starboard side. Even if it is a ship which has the inclined ship bottom 11, even if it is a ship which has the inclined ship bottom 11, it has arrange | positioned the auxiliary discharge | release part 2 which can blow out a gas into the water newly in the part used as a blind spot, ie, the part which is not covered with a gas flow. A reduction in the surface area covered by the blown-out gas can be suppressed, and the frictional resistance reduction effect can be improved.
特に、上述した第一直線Ｌ１と第二直線Ｌ２とが平行となるように第一補助放出部２１及び第二補助放出部２２を配置することにより、効果的に第一放出部１の気体流ＦＬ１，ＦＲ１の死角を補うことができ、水中に吹き出された気体が覆う表面積の減少を抑制しやすくすることができる。 In particular, by arranging the first auxiliary discharge part 21 and the second auxiliary discharge part 22 so that the first straight line L1 and the second straight line L2 described above are parallel, the gas flow FL1 of the first discharge part 1 is effectively obtained. , FR1 can be compensated for, and the reduction of the surface area covered by the gas blown into the water can be easily suppressed.
また、図１（ａ）に示したように、傾斜船底１１を有する船舶に第一放出部１及び補助放出部２を配置することにより、水中に吹き出された気体が覆う表面積の減少を抑制しつつ、船尾部に配置されたプロペラ１５への気体（気泡）の巻き込みを抑制することができる。したがって、コンテナ船等の比較的船速の遅い船舶であっても、傾斜船底１１を形成することにより、船体の摩擦抵抗を低減しつつプロペラ１５への気体（気泡）の巻き込みを容易に抑制することができる。 Moreover, as shown to Fig.1 (a), the reduction | decrease of the surface area which the gas blown into water covers is suppressed by arrange | positioning the 1st discharge | release part 1 and the auxiliary | assistant discharge | release part 2 to the ship which has the inclined ship bottom 11. Meanwhile, the entrainment of gas (bubbles) into the propeller 15 disposed at the stern part can be suppressed. Therefore, even if the ship has a relatively slow speed, such as a container ship, the formation of the inclined ship bottom 11 can easily suppress the entrainment of gas (bubbles) into the propeller 15 while reducing the frictional resistance of the hull. be able to.
また、発明者の研究により、気体流ＦＬ１，ＦＲ１の傾きφは、流速（又は船速）に反比例し、流量に比例するという知見が得られた。そこで、上述した配置を有する第一放出部１及び補助放出部２に対して、水中に吹き出された気体が覆う表面積の減少を効果的に抑制するために、第一放出部１から吹き出される気体の流量を、第一放出部１により形成される気体流ＦＬ１，ＦＲ１が第一直線Ｌ１及び第二直線Ｌ２により挟まれた領域に含まれるように制御するようにしてもよい。 Further, the inventors' research has found that the inclination φ of the gas flows FL1 and FR1 is inversely proportional to the flow velocity (or ship speed) and proportional to the flow rate. Then, in order to suppress effectively the reduction | decrease of the surface area which the gas blown in water covers with respect to the 1st discharge | release part 1 and the auxiliary | assistant discharge | release part 2 which have the arrangement | positioning mentioned above, it blows off from the 1st discharge | release part 1. The gas flow rate may be controlled such that the gas flows FL1 and FR1 formed by the first discharge unit 1 are included in a region sandwiched between the first straight line L1 and the second straight line L2.
この第一放出部１の流量制御は制御部１４で行うことができる。具体的には、制御部１４は、第一放出部１から吹き出される気体の流量を、船速に合わせて制御することにより、気体流ＦＬ１，ＦＲ１が第一直線Ｌ１及び第二直線Ｌ２により挟まれた領域に含まれるようにする。なお、気体流ＦＬ１，ＦＲ１の位置を把握するために、傾斜船底１１や補助放出部２に気体又は気泡を検出することができるセンサを配置するようにしてもよい。 The flow control of the first discharge unit 1 can be performed by the control unit 14. Specifically, the control unit 14 controls the flow rate of the gas blown from the first discharge unit 1 according to the ship speed, so that the gas flows FL1 and FR1 are sandwiched between the first straight line L1 and the second straight line L2. Included in the specified area. In addition, in order to grasp the positions of the gas flows FL1 and FR1, a sensor capable of detecting gas or bubbles may be disposed on the inclined ship bottom 11 or the auxiliary discharge unit 2.
次に、本発明の他の実施形態に係る摩擦抵抗低減船１０について、図４を参照しつつ説明する。ここで、図４は、本発明の他の実施形態に係る摩擦抵抗低減船を示す底面図であり、（ａ）は第二実施形態、（ｂ）は第三実施形態、を示している。なお、上述した第一実施形態に係る摩擦抵抗低減船１０と同じ構成部品については、同じ符号を付して重複した説明を省略する。 Next, a frictional resistance reduction ship 10 according to another embodiment of the present invention will be described with reference to FIG. Here, FIG. 4 is a bottom view showing a frictional resistance reduction ship according to another embodiment of the present invention, in which (a) shows a second embodiment and (b) shows a third embodiment. In addition, about the same component as the frictional resistance reduction ship 10 which concerns on 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.
図４（ａ）に示した第二実施形態に係る摩擦抵抗低減船１０は、第一補助放出部２１を複数配置したものである。具体的には、第一補助放出部２１は、船体中心線Ｍ上に複数配置されており、各第一補助放出部２１は、上流側の第一補助放出部２１の中心点Ｐ２０と下流側の第一補助放出部２１の舷側端点Ｐ２１１とを結ぶ第三直線Ｌ３が第一直線Ｌ１と平行となるように構成されている。 The frictional resistance reduction ship 10 according to the second embodiment shown in FIG. 4A has a plurality of first auxiliary discharge portions 21 arranged therein. Specifically, a plurality of first auxiliary discharge portions 21 are arranged on the hull center line M, and each first auxiliary discharge portion 21 is located downstream of the center point P20 of the first auxiliary discharge portion 21 on the upstream side and the downstream side. The third straight line L3 connecting the heel side end point P211 of the first auxiliary discharge part 21 is configured to be parallel to the first straight line L1.
このように、第一補助放出部２１を複数配置することにより、第一放出部１により形成される気体流ＦＬ１，ＦＲ１の中央部の隙間（死角）を効果的に埋めることができ、水中に吹き出された気体が覆う傾斜船底１１の表面積を拡大することができ、摩擦抵抗低減効果を向上させることができる。 Thus, by arranging a plurality of the first auxiliary discharge portions 21, the gaps (dead spots) in the central portions of the gas flows FL1, FR1 formed by the first discharge portions 1 can be effectively filled, and the The surface area of the inclined ship bottom 11 covered with the blown-out gas can be increased, and the frictional resistance reduction effect can be improved.
また、第一補助放出部２１を複数設置する場合には、気体が傾斜船底１１を覆う表面積をできるだけ大きくするために、第一補助放出部２１の船幅方向長さを第一放出部１の船幅方向長さよりも短くするようにしてもよい。かかる構成により、より多くの第一補助放出部２１を傾斜船底１１に形成することができ、摩擦低減効果を向上させることができる。また、気体が傾斜船底１１を覆う表面積を大きくするために、下流に向かうほど第一補助放出部２１の船幅方向長さを小さくなるように構成してもよい。 Further, when a plurality of the first auxiliary discharge portions 21 are installed, the length of the first auxiliary discharge portion 21 in the width direction of the first discharge portion 1 is set in order to increase the surface area where the gas covers the inclined bottom 11 as much as possible. You may make it make it shorter than the ship width direction length. With this configuration, more first auxiliary discharge portions 21 can be formed on the inclined ship bottom 11 and the friction reduction effect can be improved. Further, in order to increase the surface area where the gas covers the inclined ship bottom 11, the length in the ship width direction of the first auxiliary discharge portion 21 may be decreased toward the downstream.
図４（ｂ）に示した第三実施形態に係る摩擦抵抗低減船１０は、第二補助放出部２２を多段に複数配置したものである。具体的には、第二補助放出部２２は、船尾方向に向かって舷側に接近するように多段に配置されており、各第二補助放出部２２は、上流側の第二補助放出部２２の舷側端点Ｐ２２′と下流側の第二補助放出部２２の船体中心側端点Ｐ２２１とを結ぶ第四直線Ｌ４が第二直線Ｌ２と平行となるように構成されている。 The frictional resistance reduction ship 10 according to the third embodiment shown in FIG. 4B has a plurality of second auxiliary discharge portions 22 arranged in multiple stages. Specifically, the second auxiliary discharge portions 22 are arranged in multiple stages so as to approach the shore side toward the stern direction, and each second auxiliary discharge portion 22 is connected to the second auxiliary discharge portion 22 on the upstream side. A fourth straight line L4 connecting the anchor side end point P22 ′ and the hull center side end point P221 of the downstream second auxiliary discharge portion 22 is configured to be parallel to the second straight line L2.
このように、第二補助放出部２２を多段に配置することにより、第一放出部１により形成される気体流ＦＬ１，ＦＲ１の舷側の隙間（死角）を効果的に埋めることができ、水中に吹き出された気体が覆う傾斜船底１１の表面積を拡大することができ、摩擦抵抗低減効果を向上させることができる。 Thus, by arranging the second auxiliary discharge portions 22 in multiple stages, it is possible to effectively fill the gap (dead angle) on the heel side of the gas flow FL1, FR1 formed by the first discharge portion 1, and to submerge the water. The surface area of the inclined ship bottom 11 covered with the blown-out gas can be increased, and the frictional resistance reduction effect can be improved.
また、第二補助放出部２２を多段に設置する場合には、気体が傾斜船底１１を覆う表面積をできるだけ大きくするとともに、無駄な気体の吹き出しを抑制するために、第二補助放出部２２の船幅方向長さを第一放出部１の船幅方向長さよりも短くするようにしてもよく、下流に向かうほど第二補助放出部２２の船幅方向長さを徐々に小さくなるように構成してもよい。 Moreover, when installing the 2nd auxiliary discharge | release part 22 in multistage, in order to suppress the blowing of useless gas while making the surface area which gas covers the inclined ship bottom 11 possible as much as possible, the ship of the 2nd auxiliary discharge | release part 22 is carried out. The length in the width direction may be made shorter than the length in the ship width direction of the first discharge part 1, and the length in the ship width direction of the second auxiliary discharge part 22 is gradually reduced toward the downstream. May be.
本発明は上述した実施形態に限定されず、本発明は傾斜船底１１を有する全ての船舶に適用することができる等、本発明の趣旨を逸脱しない範囲で種々変更が可能であることは勿論である。 The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention, for example, the present invention can be applied to all ships having the inclined bottom 11. is there.
１ 第一放出部
２ 補助放出部
１０ 摩擦抵抗低減船
１１ 傾斜船底
２１ 第一補助放出部
２２ 第二補助放出部
Ｌ１ 第一直線
Ｌ２ 第二直線
Ｌ３ 第三直線
Ｌ４ 第四直線
Ｍ 船体中心線
Ｐ０ 中心点（第一放出部）
Ｐ１ 舷側端点（第一放出部）
Ｐ２０ 中心点（第一補助放出部）
Ｐ２１，Ｐ２１１ 舷側端点（第一補助放出部）
Ｐ２２，Ｐ２２１ 船体中心側端点（第二補助放出部）
Ｐ２２′ 舷側端点（第二補助放出部）
DESCRIPTION OF SYMBOLS 1 First discharge part 2 Auxiliary discharge part 10 Friction resistance reduction ship 11 Inclined ship bottom 21 First auxiliary discharge part 22 Second auxiliary discharge part L1 First straight line L2 Second straight line L3 Third straight line L4 Fourth straight line M Hull center line P0 center Point (first discharge part)
P1 heel side end point (first discharge part)
P20 center point (first auxiliary discharge part)
P21, P211 舷 side end point (first auxiliary discharge part)
P22, P221 Hull center side end point (second auxiliary discharge part)
P22 'heel side end point (second auxiliary discharge part)
Claims (5)
前記船体は、船幅方向に船底の喫水が浅くなるように傾斜した傾斜船底を有し、
前記傾斜船底の船首側先端部における船体中心線上に配置され気体を吹き出す第一放出部と、該第一放出部よりも後方の前記傾斜船底に配置され気体を放出する補助放出部と、を有し、
前記補助放出部は、前記第一放出部から吹き出された気体が前記傾斜船底に沿って舷側に傾斜して流れる気体流の死角となる位置に配置されている、
ことを特徴とする摩擦抵抗低減船。 In a frictional resistance reduction ship that reduces the frictional resistance of the hull by blowing gas into the water,
The hull has an inclined ship bottom inclined so that the draft of the ship bottom becomes shallow in the ship width direction,
A first discharge part that is arranged on the hull center line at the tip of the bow of the inclined ship bottom and blows out gas; and an auxiliary discharge part that is arranged on the inclined ship bottom behind the first discharge part and discharges gas. And
The auxiliary discharge part is disposed at a position where the gas blown from the first discharge part becomes a blind spot of a gas flow that flows incline toward the shore along the inclined ship bottom,
A ship with reduced frictional resistance.
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| JP2020128212A (en) * | 2015-12-04 | 2020-08-27 | サムスン・ヘヴィー・インダストリーズ・カンパニー・リミテッド | Friction resistance reducing device and ship including the same |
| KR20180091917A (en) * | 2016-03-31 | 2018-08-16 | 미츠비시 쥬고교 가부시키가이샤 | Bottom structures and vessels |
| KR20180091916A (en) * | 2016-03-31 | 2018-08-16 | 미츠비시 쥬고교 가부시키가이샤 | Hull frictional resistance reduction devices and vessels |
| WO2017169034A1 (en) * | 2016-03-31 | 2017-10-05 | 三菱重工業株式会社 | Ship bottom structure and ship |
| KR102099523B1 (en) * | 2016-03-31 | 2020-04-09 | 미츠비시 쥬고교 가부시키가이샤 | Hull friction resistance reduction device and ship |
| KR102114753B1 (en) * | 2016-03-31 | 2020-05-26 | 미츠비시 쥬고교 가부시키가이샤 | Ship structure and ship |
| EP3489124A4 (en) * | 2016-07-19 | 2019-07-03 | Hyundai Heavy Industries Co., Ltd. | Friction reducing device and ship comprising same |
| CN110160412A (en) * | 2019-06-21 | 2019-08-23 | 北京机械设备研究所 | Submarine navigation device attitude control method based on air layers reducing resistance technology |
| CN110160412B (en) * | 2019-06-21 | 2021-06-29 | 北京机械设备研究所 | Underwater vehicle attitude control method based on air film drag reduction technology |
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