JPS625112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ship (including a marine structure) whose hull resistance can be reduced by reducing wave collapse.

2. Description of the Related Art Waves such as those shown in FIGS. 1 and 2 are commonly generated in conventional ships, especially large ships and ships traveling at relatively high speeds.

At that time, bow wave collapse 4 occurred near the bow 1.
A front shoulder wave collapse 5 occurs near the front shoulder 2 of the hull, and a stern wave collapse 6 occurs near the stern 3.

In addition, wave collapse at the rear shoulder may occur near the rear shoulder of the hull.

Among these wave collapses, the bow wave collapse can be reduced to some extent by adopting a spherical bow, etc., but there is no easy way to reduce other wave collapses, which causes energy loss and reduces hull resistance. There is a problem in that it causes an increase in

The present invention aims to solve these problems, and is a phenomenon in which wave breakage creates a shear flow in the fluid in the thin surface water along the sea surface, causing separation of the flow along the sea surface. Focusing on this, the present invention aims to provide a ship equipped with a device that accelerates the above-mentioned thin surface water to reduce the occurrence of wave collapse.

For this reason, a ship equipped with the wave collapse mitigation device of the present invention can be used near the water surface of at least one of the hull locations where wave collapse is likely to occur, such as near the bow, near the stern, and near the front and rear shoulders of the hull. , to accelerate the flow of surface water toward the hull during navigation.
It is characterized by a nozzle that can eject fluid from above the water surface toward the surface water during navigation.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 3 and 4 are side views showing ships equipped with wave collapse mitigation devices as the first and second embodiments of the present invention, respectively.

The ship according to the first embodiment of the present invention shown in FIG.
2 and the nozzle 11 toward the surface water from above the sea surface 14 during navigation, thereby accelerating the flow of the surface water.

Furthermore, the ship according to the second embodiment of the present invention shown in FIG. It is designed to accelerate the flow of surface water by ejecting it to the sea surface 14 through a tube 18 and a nozzle 19.

In the first and second embodiments, the nozzle 1
The fluid ejected from 1 and 19 accelerates the flow of surface water on the sea surface 14 and gives momentum to this flow, which reduces the occurrence of wave collapse as a separation phenomenon of the flow along the sea surface 14, thereby increasing the water head. Losses are reduced.

In the second embodiment, the height of the nozzle 19 can be adjusted using the swivel joint 17 as shown by the dotted line in FIG. can be adjusted to the optimal position.

Furthermore, in the first and second embodiments, modifications can be made as necessary, such as using a header or the like to provide a large number of nozzles at one location, or attaching a float to the nozzle to make it follow the waves. Such wave collapse mitigation devices can also be installed at other parts of the ship's hull where wave collapse is likely to occur, such as the front and rear shoulders.

As described in detail above, according to the ship equipped with the wave collapse mitigation device of the present invention, focusing on the fact that wave collapse is a separation phenomenon of the flow along the sea surface, In order to accelerate the flow of surface water toward the hull during cruising, surface water is removed from above the water surface during cruising near the water surface of at least one of the hull areas where wave collapse is likely to occur, such as near the hull. It has an extremely simple structure with a nozzle that can eject fluid toward the ship, which has the advantage of efficiently reducing wave breakage and reducing hull resistance.

[Brief explanation of the drawing]

Figures 1 and 2 show the shape of waves around a conventional ship; Figure 1 is a plan view thereof, Figure 2 is a side view thereof, and Figures 3 and 4 are respectively the shapes of waves around a conventional ship. FIG. 2 is a side view showing a ship equipped with wave collapse mitigation devices as first and second embodiments. 1... Bow section, 2... Stern section, 11... Nozzle, 12
...Discharge pipe, 13...Pump, 14...Sea level, 16...Pump, 17...Swivel joint, 18...Discharge pipe, 19...Nozzle.

Claims (1)

[Claims] 1. Near the water surface of at least one of the hull parts where wave collapse is likely to occur, such as near the bow, near the stern, and near the front and rear shoulders of the hull, etc.
Equipped with a wave break mitigation device characterized by a nozzle that can eject fluid from above the water surface toward the surface water during sailing in order to accelerate the flow of surface water toward the hull during sailing. ship.