JP2023072605A - Bow wave utilization device - Google Patents

Abstract

To provide a bow wave utilization device receiving an energy of a great wave generated in bow, converting the energy into a propulsion force and utilizing the propulsion force, by not being affected by size or shape of a hull or navigation speed as well as being added to an existing vessel.SOLUTION: A bow wave utilization device is provided improving propulsion efficiency by providing a flat plate in parallel to a proceeding direction of a vessel on both sides of the bow, flowing a so-called V-shaped wave generated in the bow backward and accordingly reducing navigation resistance of the vessel by having the repulsion effect be a propulsion force.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a bow wave utilizing device for the purpose of suppressing bow waves generated during navigation of a ship and converting its energy into propulsive force. The present invention relates to a highly convenient bow wave utilization device that can be used effectively.

At present, when there is a strong demand for CO2 reduction, the practical application of technology that is effective in reducing the amount of fuel used for ship navigation is an urgent issue. With the current technology, a lot of propulsive force is consumed by the resistance of the waves generated from the bow. There are many attempts to reduce the generation of waves by controlling the However, in this method, the effect varies depending on the position of the waterline and the speed of the ship when the ship is sailing, and there are many cases where the design performance cannot be sufficiently exhibited. The main reasons for this are tankers whose waterline position changes drastically, and motorboats whose hulls float significantly.

In general, there are various types of hulls, such as displacement type, planing type, and semi-planing type. The characteristics of the waves generated at the bow differ depending on the type of ship and the sailing speed, and even if the sailing conditions change, it is difficult to find a bow wave utilizing device that can suppress the bow waves in a wide range of sailing conditions and utilize the energy effectively. do not have.

Patent No. 6111491 Both Japanese Patent Application No. 2019-165116 are based on the invention of the present applicant. Patent Document 1 has been granted a patent, but is under consideration for re-application in order to improve practical functions. Unlike the present invention, Patent Document 2 is for reducing V-shaped waves generated at the stern, and has recently been registered. Patent No. 6944095. Some business operators say that the technology in this field has been exhausted and that there is no new technology anymore, but that is not the case, and the field still needs to be improved.

The problem to be solved by the present invention is not influenced by the size and shape of the hull and the sailing speed, and by adding it to an existing ship, it is possible to receive the energy of the large waves generated at the bow and convert it into propulsive force with high efficiency. To provide a bow wave utilization device that converts and utilizes this.

Means for solving the above-mentioned problems of the present invention is a structure in which flat plates parallel to the direction of travel of the ship are provided on both sides of the bow, and the so-called V-shaped wave generated at the bow hits the flat plates and spreads outward. belongs to.
This flat plate prevents the energy of the bow wave from being released to the outside and flows backward, so that the reaction becomes propulsive force, and as a result, the sailing resistance of the ship is reduced and the propulsive efficiency is improved. Since the flat plate is not expected to have buoyancy, the hull does not need to be waterproof, which is extremely advantageous in simplifying the structure.

Waves generated at the bow of a general ship spread widely in a V-shape according to the propagation speed of the waves on the surface of the water, and the energy is not recovered and becomes a loss. If the sailing speed increases, the shape of this wave will break and become a white wave, resulting in a loss of energy that cannot be recovered even by countermeasures such as the shape of the hull. When a large ship sails at high speed, a nearby small ship shakes greatly, posing a threat to safety. As the sailing speed increases, the energy of this bow wave occupies a large portion of the sailing resistance, making it difficult to increase the speed of the ship no matter how much propulsion energy is input. Considering the efficiency of physical distribution, high-speed navigation has a great advantage, but if the fuel consumption increases significantly due to this, the balance with the improved efficiency of physical distribution must be considered. As for fishing boats, reaching the fishing grounds as quickly as possible is a major factor in securing catches. must consider the correlation of In the present invention, the increased speed and reduced fuel consumption from the mounting of the flat plate alone would be entirely desirable. The structure of this bow wave utilization device will be described below with reference to the drawings.

FIG. 1 is a side view showing one embodiment of the present invention. FIG. 2 is a plan view showing one embodiment of the present invention. FIG. 3 is a front view showing one embodiment of the present invention. FIG. 4 is a plan view showing another state of one embodiment of the present invention. FIG. 5 is a partial front view near the bow showing details of another embodiment of the present invention. FIG. 6 is a partial front view near the center of the hull showing details of another embodiment of the present invention. FIG. 7 is a side view showing another embodiment of the invention.

An embodiment for simplifying and realizing the device for utilizing bow waves according to the present invention without impairing its functions will be shown.

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a plan view showing one embodiment of the present invention. FIG. 3 is a front view showing one embodiment of the present invention. FIG. 4 is a plan view showing another state of one embodiment of the present invention, FIGS. 5 and 6 are partial front views showing details of one embodiment of the present invention, and FIG. FIG. 11 is a side view of another embodiment;
1, 2 and 3, the bow wave 3 generated from the bow 2 of the hull 1 spreads left and right in a V shape toward the rear of the hull 1. As shown in FIG. Flat plate portions 5 provided parallel to the center line 4 of the hull 1 on both sides slightly rearward from the bow 2 of the hull 1 are attached at positions separated from the side surfaces 6 of the hull 1 by a predetermined distance. The vertical position is generally located at about the height of the deck from the bottom of the ship. The crest line of the bow wave 3 spreads out at a position higher than the waterline 7 and extends like a dotted line if the flat plate portion 5 is not present. Eventually, it is gradually weakened by the viscous resistance of water, etc., and eventually disappears. However, the bow wave 3 bounced back by the flat plate portion 5 moves rearward between the side surface 6 of the hull 1 and the flat plate portion 5 while repeating up-and-down motion, and becomes much lower than the initial peak, and the rear end of the flat plate portion 5 Released from 8. In this state, it is desirable that the height of the top of the bow wave 3 is close to the plane of the waterline 7, and it is desirable that the length of the flat plate portion 5 is determined to satisfy this condition. Even if there is a relative change depending on the thickness, etc., it does not impair the intention of the present invention. In this embodiment, since the flat plate portion 5 is not expected to have buoyancy as a hull, it is not necessary to form a hollow waterproof structure, and the manufacturing cost can be minimized. In addition, since buoyancy is not expected, there is no need to have a shape in which the central portion is swollen like a general hull, so water is not pushed away, and this flat plate portion 5 generates a new V-shaped wave. It cannot be a source.

4 and 5, projections 9-1 and 9-2 parallel to the longitudinal direction of the hull 1 are provided on the surface of the flat plate portion 5 facing the hull 1 for this purpose. . A plurality of the protrusions 9-1 and 9-2 may be provided in parallel. Its detailed cross-sectional shape is shown in the front view of FIG. 5 and the front view of FIG. This has the effect of preventing splashes generated when the bow wave 3 hits the flat plate portion 5 strongly in the portion near the bow 2 from falling on the deck of the hull 1, but it loses energy as a fluid by becoming splashes. In order to keep the flow as smooth as possible, the vicinity of the apex of the protrusion 9-1 has a curved cross-sectional shape. However, in order to effectively absorb the vertical movement of the flow behind the center of the hull where the force of the bow wave weakens, the cross section near the top of the protrusion 9-2 is formed into a relatively sharp fin-like shape. is desirable.
Further, the arm 10 is movably attached to the hull 1 by means of hinges 11 and 12, so that the flat plate portion 5 can be brought into contact with the hull 1 at the time of docking or the like, thereby facilitating boarding and disembarking, as well as reducing the mooring space. Savings can be expected. Moreover, it is a matter of course that it has a function of being able to be fixed at any position not shown in FIGS.
Further, as shown in FIG. 6, the upper surface of the rear end 8 of the flat plate portion 5 is obliquely inclined with respect to the waterline so as to become lower toward the rear. This is to form the water surface between the side 6 of the hull 1 and the flat plate 5 so as to be discharged with the height equal to the waterline 7 as much as possible. This minimizes wave generation at the trailing edge 8 .
FIG. 7 is a side view showing another embodiment of the invention.
In FIG. 7, particularly large tankers may sail with the position of the waterline 7 greatly different. Since the bow wave is relatively small in a large ship, the flat plate portion 5 is relatively small compared to the hull 1 . The hinge 12 is provided with a hydraulically or electrically extendable cylinder 13 so that the flat plate portion 5 as a whole can move up and down. With this structure, the vertical position of the flat plate portion 5 can be optimally set according to the change in the waterline 7 . The dotted line indicates the waterline 7 and the lowered state of the plate portion.
〔motion〕

A supplementary explanation will be given of the operation of the bow wave canceling device for ships of the present invention shown in the above embodiment. By attaching the flat plate portion 5, the ship embodying the present invention can prevent the bow wave caused by its navigation from spreading to the outside. In addition, it is possible to prevent the generation of high waves on the quay. It can be said that it is an extremely excellent energy-saving effect that the energy brought to the outside can be suppressed in this way and, conversely, it can be converted into propulsive force and utilized. The above effect can be clearly confirmed by attaching the flat plate portion 5 to the hull and observing the waves on the flat plate portion 5 from above.

As is clear from the above description, the bow wave suppressing device of the present invention effectively suppresses bow waves without any restrictions on the size or speed of the hull by attaching flat plate members to both sides of the bow of an existing ship. It is capable of converting energy into propulsion and has many advantages such as increased safety by removing danger to other ships on the voyage, fuel reduction on water transport and other benefits. The effect is extremely significant.

1 Hull 2 Bow 3 Bow wave 4 Center line 5 Flat plate 6 Side 7 Water line 8 Rear end 9-1, 9-2 Projection 10 Arm 11 Hinge 12 Hinge 13 Cylinder

Claims (6)

The flat plate parts, which are installed parallel to the centerline of the hull on both sides slightly behind the bow of the hull, are attached at a certain distance from the side of the hull, and the vertical position is located above and below the waterline. bow wave utilization device. 2. A device for utilizing bow waves according to claim 1, wherein at least one fin-like projection parallel to the traveling direction of the hull is provided on the hull side of the flat plate portion. At least one projection parallel to the direction of travel of the hull is provided on the hull side of the flat plate portion. 2. A device for utilizing bow waves according to claim 1, wherein the cross-section of the protrusion near the edge is fin-shaped with a sharp apex. 2. A device for utilizing bow waves according to claim 1, wherein the flat plate portion is attached to the hull by a pivotable arm so as to be movable in a horizontal plane. 2. A device for utilizing bow waves according to claim 1, wherein the rear end of the upper portion of the flat plate portion is inclined obliquely with respect to the waterline, and is formed so as to become lower toward the rear. 2. A device for utilizing bow waves according to claim 1, wherein the flat plate portion is attached to the hull by an expandable cylinder so as to be vertically movable.

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