JPS60252094A - Wave-break-reduction ship - Google Patents

Abstract

PURPOSE:To decrease the resistance of water to the hull of a ship, by protruding a flat rectifier forward from the bow of the ship slightly over its designed load line to restrict the upward flow of water on the outside surface of the bow to reduce the wave breaking phenomenon thereon. CONSTITUTION:A rectifier 2 is protruded forward from the bow of a ship. The rectifier 2 has a flat form and is so attached to the ship that the top of the rectifier is located slightly over the designed load line 3a of the ship. Since the rectifier 2 covers a water region wherein vortexes are caused as a result of break of waves, the rotation of the vortexes is restrained. Since the flow of water around the rectifier 2 is accelerated, the rise of the water surface on the bow of the ship is diminished to suppress the production of waves on the bow. The wave breaking phenomenon is thus reduced to greatly decrease the resistance of water to the hull of the ship.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wave-breaking type ship which is capable of reducing the wave-breaking phenomenon at the bow of the ship and reducing hull resistance.

[Conventional technology]

Generally, in the bow of a swollen ship such as a tanker or a ship that travels at relatively high speed, a large bow wave is generated during navigation, and a phenomenon of wave collapse occurs.

That is, as shown in FIG. 3, when the enlarged hull 1 sails, the seawater surface 3 is caused by the bow wave at its bow.
is raised, this causes wave collapse, and a fluid region 5 with a vortex in the direction of rotation shown by arrow 4 is generated.

[Problem that the invention seeks to solve]

Such phenomena of bow wave and wave collapse cause a problem in that the ship's hull resistance increases considerably, leading to a decrease in the propulsion efficiency of the ship.

The present invention aims to solve these problems, and by suppressing vortices along the outer surface of the bow part, the present invention aims to reduce the wave breaking phenomenon and reduce the hull resistance. The purpose is to provide a ship that reduces collapse.

[Means for solving problems]

Therefore, the wave collapse mitigation type ship of the present invention suppresses the upward flow along the outer surface of the bow part to reduce the wave collapse phenomenon.
A rectifier is provided that protrudes forward from the bow, and the rectifier is formed flat and arranged so that at least the main part of the upper surface of the rectifier is located slightly above the planned load waterline. It is characterized by

[Effect]

According to the above-mentioned wave collapse mitigation type ship of the present invention, the flat rectifying member protruding from the hull partially occupies the fluid region with vortices at the bow, thereby reducing the upward flow along the outer surface of the bow. is suppressed, and the wave breaking phenomenon is reduced.

〔Example〕

Hereinafter, a wave break mitigation type ship as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a sectional view showing the bow part of the ship and the state of bow waves when the ship is sailing;
FIG. 2 is a plan view of the bow section of the boat, and the bow section of the hull 1 is provided with a flow regulating member 2 that projects forward.

The flow straightening member 2 is formed symmetrically and flat with respect to the hull centerline A, and is arranged such that at least the main part of the upper surface of the flow straightening member 2 is located slightly above the planned load waterline 3a. ing.

By providing the rectifying member 2 as described above, the rectifying member 2 partially occupies the fluid region 5 (see FIG. 3) accompanied by vortices caused by breaking waves. Therefore, rotation of the vortex in the fluid region 5 is suppressed, and complicated fluid motion in the fluid region 5 is reduced.

Furthermore, the provision of the rectifying member 2 has the effect of accelerating the surrounding flow, so that the prominence of the seawater surface 3 at the bow of the hull 1 is also reduced, and the generation of bow waves at the bow is suppressed.

Therefore, the rectifying member 2 reduces the phenomenon of wave collapse and also suppresses the generation of bow waves, so that the hull resistance is significantly reduced.

Furthermore, if the lower surface of the straightening member 2 is located slightly on either side of the planned load waterline, the sea level at the bow will rise when the ship is running, and the straightening member 2 will have almost the same effect as described above. It comes off by showing off.

In addition, the above-mentioned wave collapse mitigation type ship may be equipped with a mechanism that moves the rectifying member 2 to an optimal position according to a change in draft.

〔Effect of the invention〕

As described in detail above, according to the wave collapse mitigation type ship of the present invention, in order to reduce the wave collapse phenomenon by suppressing the upward flow along the outer surface of the bow part, a rectifying member protruding forward from the bow is provided, It has an extremely simple configuration in which the rectifying member is formed flat and is installed so that at least the main part of the upper surface of the rectifying member is located slightly above the planned load water line. In addition to significantly reducing the phenomenon of bow waves, the occurrence of bow waves has also been suppressed.
This reduces hull resistance and improves propulsion performance.
It also has the advantage of reducing fuel costs.

[Brief explanation of drawings]

Figures 1 and 2 show a wave collapse mitigation type ship as an embodiment of the present invention, and Figure 1 is a sectional view showing the bow of the ship and the state of bow waves when the ship is sailing. 3 is a plan view of the bow of the ship, and FIG. 3 is a side view showing the bow of a conventional ship and the state of the bow wave when the ship is sailing. 1...hull, 2...straightening member, 3...seawater surface, 3a,
1st pull, i-side, aged rostrum ζ, , trace f, letter to I car A, . Hull centerline. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 3

Claims (1)

[Claims] In order to suppress the upward flow along the outer surface of the bow part and reduce the wave breaking phenomenon, a rectifying member is provided that protrudes forward from the bow, and the rectifying member is formed flat, and at least the main part of the upper surface of the rectifying member is provided. A ship of wave collapse mitigation type, characterized by being arranged so that it is located slightly above the planned load waterline.