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Device for reducing frictional resistance of ship body

A technology of frictional resistance and hull, which is applied in the direction of hull, hull design, hydrodynamic characteristics/hydrostatic characteristics, etc., can solve the problems that the frictional resistance of the hull cannot be fully reduced, and achieve shortening the setting distance, expanding the formation area, and film thickness uniform effect

Active Publication Date: 2014-02-26
MITSUBISHI SHIPBUILDING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to this structure, since the area where the bubble film is formed on the bottom of the bow side is narrow, the frictional resistance of the hull on the bow side cannot be sufficiently reduced.

Method used

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  • Device for reducing frictional resistance of ship body
  • Device for reducing frictional resistance of ship body
  • Device for reducing frictional resistance of ship body

Examples

Experimental program
Comparison scheme
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no. 1 example

[0058] in, figure 1 It is a side view schematically showing the hull to which the hull frictional resistance reducing device of the first embodiment is installed. figure 2 It is an explanatory diagram showing the structure of the hull frictional resistance reducing device of the first embodiment. image 3 It is a bottom view of the ship schematically showing the ship body to which the device for reducing frictional resistance of the ship body according to the first embodiment is installed. Figure 4 yes image 3 The A-A' cross-sectional view of the central air ejection hole group. Figure 5 yes figure 2 B-B' sectional view of a pair of side air ejection holes. Image 6 It is a plan view showing the shape and arrangement of the first air ejection holes of each air ejection hole group, Figure 7 It is a plan view showing the shape and arrangement of the second air ejection holes of each air ejection hole group, Figure 8 It is a plan view showing the shape and arrangemen...

no. 2 example

[0085] Below, refer to Figure 9 , the hull frictional resistance reducing device 50 of the second embodiment will be described. In addition, in order to avoid redundant description, only the different parts will be described. Figure 9 It is a bottom view schematically showing the hull to which the hull frictional resistance reducing device of the second embodiment is installed. The hull frictional resistance reducing device 50 includes a central air ejection hole group 55 , a pair of first side air ejection hole groups 56 , and a pair of second side air ejection hole groups 57 .

[0086] Specifically, the structure of the center air ejection hole group 55 is the same as that of the first embodiment, and is formed at the center of the ship bottom 5 of the bow side hull 1 in the ship width direction. Moreover, a pair of 1st side air injection hole group 56 is formed in the stern side of the center air injection hole group 55, and is formed in the both sides of the center air...

no. 3 example

[0092] Below, refer to Figure 10 , the hull frictional resistance reducing device 70 of the third embodiment will be described. In addition, in order to avoid redundant description, only the different parts will be described. Figure 10 It is a bottom view of the ship schematically showing the ship body to which the device for reducing frictional resistance of the ship body according to the third embodiment is installed. In this hull frictional resistance reduction device 70, the central air ejection hole group 30a and the pair of side air ejection hole groups 30b, 30b of the first embodiment are used as a set of air ejection parts 71a, and two sets are arranged in the length direction of the ship. This air ejection part 71a.

[0093] Specifically, one set of air spraying portions 71a, 71b of the two sets of air spraying portions 71a, 71b is formed at the same position as in the first embodiment, and the other set of air spraying portions 71b is formed at the stern of the a...

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Abstract

In a ship-body frictional resistance reducing device for reducing frictional resistance of a sailing ship body 1 by forming an air bubble curtain on a ship's bottom 5 by generating air bubbles from a plurality of air ejection holes formed on the ship's bottom 5, the air ejection holes are arranged in a ship width direction to constitute an air-ejection hole group, and a plurality of air ejection holes groups of the same type as the air-ejection hole group is formed on the ship's bottom 5. The air-ejection hole groups include at least a center air-ejection hole group 30a formed at the center of the ship width direction at a bow side and a pair of side air-ejection hole groups 30b and 30b formed at a stern side from the center air-ejection hole group 30a at both sides of the center air-ejection hole group 30a in the ship width direction. A length of the center air-ejection hole group 30a in the ship width direction is formed to be longer than a length of the side air-ejection hole group 30b in the ship width direction.

Description

technical field [0001] The present invention relates to a device for reducing frictional resistance of a ship, which reduces the frictional resistance of the ship when the ship is sailing by generating air bubbles from a plurality of air ejection holes formed on the bottom of the ship to form an air bubble film on the bottom of the ship. Background technique [0002] Conventionally, there is known an air blower for a frictional resistance reducing ship in which a plurality of air blowing parts are arranged along the ship's width direction on the bottom shell (for example, refer to Patent Document 1). In the air blower of the frictional resistance reducing ship, the plurality of air blowing parts are arranged in a staggered manner in the ship width direction, thereby increasing the strength of the hull. [0003] In addition, Patent Document 2 discloses a hull frictional resistance reduction device in which a plurality of air injection holes are formed in a ship bottom shell p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B1/38
CPCB63B2001/387B63B1/38Y02T70/122Y02T70/10
Inventor 高野真一川北千春日笠靖司郎沟上宗二龟山将一峰孝志
Owner MITSUBISHI SHIPBUILDING CO LTD