PROBLEM TO BE SOLVED: To provide a semi-submerged moving body so as not to produce a rotational moment in the nose-up direction when a strut is subjected to the resistance in the cruising state.SOLUTION: A semi-submerged moving body 1 includes a cruising body 2 cruising below a water surface W, and a strut 3 installed on the upper side of the cruising body 2 to protrude above the water surface W. The cruising body 2 includes a separated flow forming part 10 on the lower side of a nose 8. The separated flow forming part 10 has a bulged part 10a which bulges downward the lower surface side located lower than a body center-line O of the nose 8, and a bent part 10b provided at its rear edge. Cruising the semi-submerged moving body 1, the boundary layer separation is generated in the separated flow forming part 10, and the pressure resistance and fluid resistance are generated in the lower side of the nose 8. This leads to a result that the force to produce the rotational moment in the nose-up direction generated by the resistance of the strut 3 in the cruising state is cancelled by the force to produce the rotational moment in the nose-down direction generated in the separated flow forming part 10.SELECTED DRAWING: Figure 1
【課題】 航走時にストラットが抵抗を受けても機首上げ方向の回転モーメントが生じないようにする。【解決手段】 半没型移動体1は、水面Wよりも下方を航走する航走体2と、航走体2の上側に、水面Wよりも上方に突出するよう設けられたストラット3とを備える。航走体2は、機首8の下部側に剥離流形成部10を備える。剥離流形成部10は、機首8の機体中心線Oよりも下方に位置する下面側を下方に膨らませた形状の膨出部10aと、その後縁に備えた屈曲部10bとを有する。半没型移動体1を航走させると、剥離流形成部10では境界層剥離が生じ、機首8の下部側には流体抵抗と共に圧力抵抗が生じる。これにより、航走時にストラット3が受ける抵抗に起因して発生する機首上げ方向の回転モーメントを発生させようとする力を、剥離流形成部10で発生する機首下げ方向の回転モーメントを発生させようとする力によって相殺させる。【選択図】図1
SEMI-SUBMERGED MOVING BODY
半没型移動体
2018-04-12
Patent
Electronic Resource
Japanese
IPC: | B63G OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS , Angriffs- oder Verteidigungsanordnungen auf Schiffen |
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