Frictional resistance reducing vessel and a method of reducing frictional resistance of a hull

Inactive Publication Date: 2001-09-20
IHI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of blowing a gas into water using such an apparatus, since a new motive power is required to operate the apparatus, the amount of motive power conserved during operation as a result of reduction by microbubbles ends up being lost.
At locations of comparatively large water depths, such as the bottom of a large ship, in particular, it is necessary to pressurize the gas to a high pressure corresponding to t

Method used

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  • Frictional resistance reducing vessel and a method of reducing frictional resistance of a hull
  • Frictional resistance reducing vessel and a method of reducing frictional resistance of a hull
  • Frictional resistance reducing vessel and a method of reducing frictional resistance of a hull

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embodiment 2

[0134] The following provides an explanation of another embodiment of the frictional resistance reducing vessel as claimed in the present invention with reference to the drawings. FIG. 6A shows an example of arranging bubble generator 111, instead of bubble generator 31, on the bottom of frictional resistance reducing vessel M shown in FIG. 2A.

[0135] As shown in FIG. 6B, this bubble generator 111 is equipped with outer cylinder 121, which extends in the vertical direction and is fixed to hull 30, inner cylinder 122 in the form of an air induction pipe (AIP) that is housed within outer cylinder 121 while being able to be attached and removed and being able to move freely along the axial direction of outer cylinder 121 (vertical direction), negative pressure forming portion 123 provided on the lower end of inner cylinder 122, and position adjustment unit 124 for adjusting the position (height) in the axial direction of inner cylinder 122 relative to outer cylinder 121.

[0136] Outer cyl...

embodiment 3

[0152] The following provides an explanation of still another embodiment of the frictional resistance reducing vessel as claimed in the present invention with reference to the drawings. FIG. 9A is a side view of the starboard side in the vicinity of the bow of frictional resistance reducing vessel M shown in FIG. 2A that shows an example in which bubble generator 201 is arranged on the bottom of frictional resistance reducing vessel M shown instead of bubble generator 31. In addition, FIG. 9B is an overhead view as viewed from the bottom of vessel M, while FIG. 9C is a cross-sectional view taken along line A-A in FIG. 9A. In these drawings, reference symbol 202 is an outer cylinder, 203 an inner cylinder, 204 a stopping mechanism (protrusion adjustment means) and 205 a cover. Among these, outer cylinder 202, inner cylinder 203 and stopping mechanism 204 compose bubble generator 201 in frictional resistance reducing vessel M.

[0153] Outer cylinder 202 is a through path that passes ver...

embodiment 4

[0167] The following provides an explanation of still another embodiment of the frictional resistance reducing vessel as claimed in the present invention with reference to the drawings. In FIG. 10A, reference symbol Ma indicates a frictional resistance reducing vessel, 60 a hull, 62 a hull shell plate (submerged surface), 63 a propeller, 64 a rudder and 311 a bubble generator.

[0168] As shown in FIG. 10B, bubble generator 311 is equipped with indentation 320 formed so as to be recessed from hull shell plate 62 of the vessel bottom, flow path 321 which passes through hull 60 and is open above and below draft line 15, and negative pressure forming member 322 arranged inside indentation 320.

[0169] Indentation 320 is formed by chamber 330 attached to hull shell plate 62 from the inside of hull 60. Namely, chamber 330 is formed into the shape of a box of which one face is open, and that open end is connected to hull shell plate 62 from the inside of hull 60. Furthermore, chamber 330 is co...

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Abstract

The object of the present invention is to provide a frictional resistance reducing vessel and method of reducing the frictional resistance of a hull that are able to effectively conserve energy consumed during operation by reducing frictional resistance at a low level of energy consumption. In the present invention, a negative pressure region (51), which is at low pressure relative to a gaseous space, is formed in the water accompanying operation of a hull (30), and together with bubbles being guided to this negative pressure region (51) in the water from the gaseous space, the state of this negative pressure region (51) is changed based on changes in vessel velocity.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a frictional resistance reducing vessel that reduces the frictional resistance of the hull, and more particularly, to improving the total energy efficiency by efficiently releasing bubbles into the water.[0003] 2. Description of the Prior Art[0004] A method has been proposed in the prior art for the purpose of conserving energy consumed during operation of marine vessels and so forth that consisted of reducing frictional resistance between the hull and the water by feeding a gas into the water and juxtaposition of a large number of microbubbles in the vicinity of the surface of the hull shell plate (submerged surface).[0005] Technologies for generating microbubbles in water are proposed in Japanese Unexamined Patent Application, First Publication No. 50-83992, Japanese Unexamined Patent Application, First Publication 53-136289, Japanese Unexamined Patent Application, First Publication 60-139586, Japanese Unexami...

Claims

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Application Information

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IPC IPC(8): B63B1/34B63B1/38
CPCB63B1/34B63B1/38Y02T70/121Y02T70/122Y02T70/10
Inventor TAKAHASHI, YOSHIAKI
Owner IHI CORP
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