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1. 发明专利

FI991259A 未知
公开(公告)号：FI991259A
公开(公告)日：1999-12-04
申请号：FI991259
申请日：1999-06-02
申请人： ISHIKAWAJIMA HARIMA HEAVY IND , KATO HIROHARU
发明人： TAKAHASHI YOSHIAKI , YOSHIDA YUKI , KATO HIROHARU
IPC分类号： B63B1/38 , B63B9/00 , F15D1/12 , G01N13/02 , G01N19/02 , G01N
摘要： A method is provided for analyzing the effects of bubbles on skin-friction reduction in a ship cruising in a bubbly flow field. A shear stress decrement tau t, produced by a bubble in a flow field is obtained in a high frequency band region, in which a product of a bubble time-constant T and a turbulence frequency omega L in a flow field is sufficiently greater than 1, based on a resistive force DELTA Rv acting on a bubble derived from the bubble movements in a fluid flow direction along a ship surface and in a direction at right angles to a ship wall surface. Assuming that the shear stress decrement is generated by a decrease in a gas mixing length, an expression for the operative wall constant kappa 1 for bubbly flow including a parametric bubble diameter db is derived. Based on an expression relating the operative wall constant kappa 1 and a local friction factor Cf in bubbly flow, and an expression relating the normal wall constant kappa in non-bubbly flow and a local friction factor Cf0 in non-bubbly flow, an analytical solution is obtained for a skin-friction ratio Cf/Cf0.

2. 发明专利

FI991259A0 未知
公开(公告)号：FI991259A0
公开(公告)日：1999-06-02
申请号：FI991259
申请日：1999-06-02
申请人： ISHIKAWAJIMA HARIMA HEAVY IND , KATO HIROHARU
发明人： TAKAHASHI YOSHIAKI , YOSHIDA YUKI , KATO HIROHARU
IPC分类号： B63B1/38 , B63B9/00 , F15D1/12 , G01N13/02 , G01N19/02 , G01N
摘要： A method is provided for analyzing the effects of bubbles on skin-friction reduction in a ship cruising in a bubbly flow field. A shear stress decrement tau t, produced by a bubble in a flow field is obtained in a high frequency band region, in which a product of a bubble time-constant T and a turbulence frequency omega L in a flow field is sufficiently greater than 1, based on a resistive force DELTA Rv acting on a bubble derived from the bubble movements in a fluid flow direction along a ship surface and in a direction at right angles to a ship wall surface. Assuming that the shear stress decrement is generated by a decrease in a gas mixing length, an expression for the operative wall constant kappa 1 for bubbly flow including a parametric bubble diameter db is derived. Based on an expression relating the operative wall constant kappa 1 and a local friction factor Cf in bubbly flow, and an expression relating the normal wall constant kappa in non-bubbly flow and a local friction factor Cf0 in non-bubbly flow, an analytical solution is obtained for a skin-friction ratio Cf/Cf0.

3. 发明专利

FI982302A0 未知
公开(公告)号：FI982302A0
公开(公告)日：1998-10-23
申请号：FI982302
申请日：1998-10-23
申请人： ISHIKAWAJIMA HARIMA HEAVY IND , KATO HIROHARU
发明人： TAKAHASHI YOSHIAKI , YOSHIDA YUKI , KATO HIROHARU
IPC分类号： B63B1/38 , B63B9/00 , F15D1/12 , G01M10/00 , B63B
摘要： A computer simulation of bubbles enveloping a ship is performed by a. calculating a turbulent flow energy and an energy loss caused by an energy dissipation factor as well as an average fluid velocity in each of cells defined by three-dimensional orthogonal lattices constructed in a flow field including a turbulent boundary layer formed about a submerged surface of the ship; b. simulating a generation and ejection of a bubble into the turbulent flow layer at a given time from a given jet outlet with a given initial bubble velocity; c. calculating directional bubble velocities in each of cells according to the turbulent flow energy, the energy dissipation factor, the average fluid velocity and random numbers; d. calculating a bubble location at a succeeding unit time by solving equations of motion according to the directional bubble velocities and average fluid velocity; e. calculating a void fraction in each of cells according to the bubble location at the succeeding unit time; f. repeating step c to step e for another bubble for a given number of iterations until an integer time is reached by incrementing a time parameter by a unit time; and g. calculating distribution of void fractions in all cells to represent an overall distribution of bubbles at the integer time, and terminating computation when it is decided that the distribution of bubbles is converging.

4. 发明专利

NO983469D0 未知
公开(公告)号：NO983469D0
公开(公告)日：1998-07-28
申请号：NO983469
申请日：1998-07-28
申请人： ISHIKAWAJIMA HARIMA HEAVY IND , KATO HIROHARU
发明人： TAKAHASHI YOSHIAKI , YOSHIDA YUKI , KATO HIROHARU
IPC分类号： B63B1/38 , F15D
摘要： A method is provided for reducing skin-friction of a ship (1) moving through bubbly flow fields generated in proximity of hull surfaces (3) by jetting gas through a plurality of jet nozzles (6) provided on hull surfaces of the ship. The gas flow rate is controlled so as to establish a peak void fraction in a turbulent boundary layer, by applying an observation that the location of a peak void fraction shifts away in a direction normal to the hull surface with increasing gas flow rate through the jet nozzles.

5. 发明专利

NO983797L 未知
公开(公告)号：NO983797L
公开(公告)日：1999-02-23
申请号：NO983797
申请日：1998-08-19
申请人： ISHIKAWAJIMA HARIMA HEAVY IND , KATO HIROHARU
发明人： TAKAHASHI YOSHIAKI , YOSHIDA YUKI , KATO HIROHARU , SATO KAZUO
IPC分类号： B63B1/38
摘要： A ship (1) with reduced skin friction achieves its friction reducing effects by blowing out gas as micro-bubbles from gas jet outlets (4) into the water at the interface with the submerged surface (3) of the ship's hull (2). The ship (1) has laminar protrusion sections (5) on both lateral surfaces of its bulbous bow (6). The laminar protrusion sections (5) are integrally formed with and protrude from the outer plate (P) of the ship (1). At the apex region (5a) of the laminar protusion sections (5) a plurality of gas jet outlets are provided which are connected to a gas supply pipe (7).

6. 发明专利

FI981213A 未知
公开(公告)号：FI981213A
公开(公告)日：1998-12-01
申请号：FI981213
申请日：1998-05-29
申请人： ISHIKAWAJIMA HARIMA HEAVY IND , KATO HIROHARU
发明人： TAKAHASHI YOSHIAKI , YOSHIDA YUKI , KATO HIROHARU
IPC分类号： G01M10/00 , B63B1/38 , G01M1/38 , G01M1/10
摘要： Distribution pattern of bubbles produced from a bubble jet of a ship is analyzed by approximating the bubbly flow as a continuous flow of a gas phase and treating the bubbles as diffusing particles dispersing in a flow of the gas phase.

7. 发明专利

FI981784A0 未知
公开(公告)号：FI981784A0
公开(公告)日：1998-08-19
申请号：FI981784
申请日：1998-08-19
申请人： ISHIKAWAJIMA HARIMA HEAVY IND , KATO HIROHARU
发明人： TAKAHASHI YOSHIAKI , YOSHIDA YUKI , KATO HIROHARU , SATO KAZUO
IPC分类号： B63B1/38 , B63B
摘要： A ship (1) with reduced skin friction achieves its friction reducing effects by blowing out gas as micro-bubbles from gas jet outlets (4) into the water at the interface with the submerged surface (3) of the ship's hull (2). The ship (1) has laminar protrusion sections (5) on both lateral surfaces of its bulbous bow (6). The laminar protrusion sections (5) are integrally formed with and protrude from the outer plate (P) of the ship (1). At the apex region (5a) of the laminar protusion sections (5) a plurality of gas jet outlets are provided which are connected to a gas supply pipe (7).

8. 发明专利

FI950109A 未知
公开(公告)号：FI950109A
公开(公告)日：1995-01-10
申请号：FI950109
申请日：1995-01-10
申请人： KATO HIROHARU , ISHIKAWAJIMA HARIMA HEAVY IND
发明人： KATO HIROHARU , TAKAHASHI YOSHIAKI
IPC分类号： B63B1/38 , B63B
摘要： A method of reducing a friction on a cruising body, a cruising body (Y) with reduced friction, and a method of and an apparatus for generating microbubbles for use in reduction of friction, aiming at reducing a frictional resistance with a small energy consumption to thereby enhance an overall energy efficiency and make readily practicable a measure of reducing a frictional at resistance. A mixed fluid containing bubbles and water is jetted rearwardly and obliquely away from the submerged surface (4) of the hull (1) into a boundary layer formed in the vicinity of the submerged surface (4) from fluid jetting nozzles (3) so that a kinetic energy of water having a great mass is utilized to inject bubbles more deeply into a desired bottom layer of the boundary layer than in the case where only bubbles are injected, for effective reduction of friction.

9. 发明公开

EP0903287A3 Ship with reduced skin friction and gas jetting device for the same 审中-公开
标题翻译：船具有降低Obeflächenreibung和气体喷嘴装置为此
公开(公告)号：EP0903287A3
公开(公告)日：2002-01-30
申请号：EP98402084.2
申请日：1998-08-20
申请人： Ishikawajima-Harima Heavy Industries Co., Ltd. , Kato, Hiroharu
发明人： Takahashi, Yoshiaki , Yoshida, Yuki , Kato, Hiroharu , Sato, Kazuo
IPC分类号： B63B1/38
CPC分类号： B63B1/38 , B63B2001/387 , Y02T70/122
摘要： A ship (1) with reduced skin friction achieves its friction reducing effects by blowing out gas as micro-bubbles from gas jet outlets (4) into the water at the interface with the submerged surface (3) of the ship's hull (2). The ship (1) has laminar protrusion sections (5) on both lateral surfaces of its bulbous bow (6). The laminar protrusion sections (5) are integrally formed with and protrude from the outer plate (P) of the ship (1). At the apex region (5a) of the laminar protusion sections (5) a plurality of gas jet outlets are provided which are connected to a gas supply pipe (7).

10. 发明公开

EP0865985A1 METHOD OF REDUCING FRICTION RESISTANCE OF HULL, SHIP WHOSE FRICTION RESISTANCE IS REDUCED BY THE METHOD, AND METHOD OF ANALYZING JETTED BUBBLES ON SHIP 失效
标题翻译：船体的摩擦阻力这种方法降低的摩擦的减少，船到的方法已经和分析方法喷出泡影
公开(公告)号：EP0865985A1
公开(公告)日：1998-09-23
申请号：EP96939344.6
申请日：1996-12-03
申请人： Ishikawajima-Harima Heavy Industries Co., Ltd. , Kato, Hiroharu
发明人： KATO, Hiroharu , TAKAHASHI, Yoshiaki , YOSHIDA, Yuki , MASUKO, Akira , WATANABE, Osamu
IPC分类号： B63B1/38 , G01M10/00
CPC分类号： B63B1/38 , B63B9/002 , B63B2001/387 , F15D1/12 , G01M10/00 , Y02T70/122
摘要： The friction resistance of the hull (2) of a ship (1) while navigating is reduced by jetting out minute air bubbles (8) of a predetermined diameter from positions of small static pressure near starting points of flow lines (F.L.) of water, which extend toward the bottom (5) of the ship from positions of small draft in a submerged part of the bow (4) of the hull (2) along both side surfaces of the hull (2), and allowing the minute air bubbles (8) to move down to the bottom (5) of the ship (1) along the flow lines (F.L.), thereby distributing minute air bubbles (8) over at least a part of a region around the submerged part of the hull (2).
摘要翻译：的船舶（1）的船体（2）的摩擦阻力而导航是通过从水邻近油管的起点小静压（佛罗里达州）的位置喷出微小的气泡具有预定直径的（8）还原，朝向底部延伸（5）从小草案位置在船头的水下部分船舶的（4）的船体（2）沿船体（2），并允许微小的气泡的bothside表面（的 8）向下移动到所述底部（5）的船舶（1）沿流线（FL），从而分散微小的气泡（8）在至少约船体的水下部分的区域的部分（2 ）。

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