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Stern fins and ships with such stern fins

A stern and ship technology, applied in the field of stern fins, can solve the problems of increased ship resistance and achieve the effect of improving efficiency

Active Publication Date: 2022-04-05
KAWASAKI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bilge vortex will increase the resistance of the ship when sailing

Method used

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  • Stern fins and ships with such stern fins
  • Stern fins and ships with such stern fins
  • Stern fins and ships with such stern fins

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Experimental program
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Effect test

Embodiment approach

[0038] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0039] figure 1 It is a schematic side view of the stern part 3 of 1 A of ships of one Embodiment. The ship 1A of the present embodiment is a medium-speed ship or a high-speed ship whose Froude number Fn of the planned speed is 0.17 or more. In addition, the ship 1A is a single-shaft ship in which a propeller 4 is provided at the center of the hull 2 ​​.

[0040] Such as figure 1 As shown, the propeller 4 is arranged on the stern part 3 of the hull 2, and the propeller 4 is provided on the stern part 3. In addition, in this specification, "the stern part" means the part which occupies 40% of the ship's length from the propeller 4 to the front of the hull 2. As shown in FIG. The propeller 4 has a shaft portion 5 extending in the ship's longitudinal direction and protruding rearward from the hull 2 ​​, and a plurality of blade portions 6 arranged circumferentially aro...

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Abstract

A stern fin on which a propeller is mounted and which is mounted on the side surface of the stern of a ship having a Froude number of 0.17 or more at a planned speed, the stern fin being located on the forward side of the propeller in the direction of travel of the ship and on the rotation axis of the propeller In the cross-sectional shape of the stern fin perpendicular to the protruding direction of the stern fin protruding from the side surface of the stern, the center obtained by sequentially connecting the midpoints of the upper surface and the lower surface of the stern fin The line protrudes downward, and in the protruding direction, the maximum protruding length of the stern fin protruding from the side surface of the stern portion is not less than 2% and not more than 15% of the diameter of the propeller.

Description

technical field [0001] The present invention relates to a stern fin attached to the stern portion of a fast ship, for example, a ship with a Froude number of 0.17 or more at a planned speed, and a ship provided with the stern fin. Background technique [0002] Generally, when the ship is sailing, a bilge vortex is generated in front of the propeller at the stern of the ship. The bilge vortex will increase the resistance of the ship when sailing. Therefore, conventional attempts have been made to improve the propulsion efficiency of ships by providing fins at the stern of the hull to rectify the bilge eddy currents or using the bilge eddy currents for propulsion of the ship. [0003] Patent Document 1 discloses a stern fin that is mounted on the surface of a hull in front of a propeller and has an airfoil cross-sectional shape in which a beam arch line protrudes downward. The side of the bilge vortex nearer to the center of the bilge vortex becomes a downflow flowing obliqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63H5/16
CPCB63H5/16B63H1/28
Inventor 滨野哲也小桥建二郎渕上好冬横山梓乃
Owner KAWASAKI HEAVY IND LTD